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WO2020067349A1 - Rotor of electric rotary machine - Google Patents

Rotor of electric rotary machine Download PDF

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Publication number
WO2020067349A1
WO2020067349A1 PCT/JP2019/037983 JP2019037983W WO2020067349A1 WO 2020067349 A1 WO2020067349 A1 WO 2020067349A1 JP 2019037983 W JP2019037983 W JP 2019037983W WO 2020067349 A1 WO2020067349 A1 WO 2020067349A1
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WO
WIPO (PCT)
Prior art keywords
diameter side
permanent magnet
outer diameter
inner diameter
magnet
Prior art date
Application number
PCT/JP2019/037983
Other languages
French (fr)
Japanese (ja)
Inventor
雅志 井上
光治 河波
慎吾 相馬
芳永 久保田
Original Assignee
本田技研工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 本田技研工業株式会社 filed Critical 本田技研工業株式会社
Publication of WO2020067349A1 publication Critical patent/WO2020067349A1/en

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

Definitions

  • the present invention relates to a rotor of a rotating electric machine mounted on an electric vehicle or the like.
  • a so-called IPM motor in which a plurality of permanent magnets are arranged at predetermined intervals in a circumferential direction inside a rotor core has been known as a rotor used in a rotating electric machine.
  • a means for fixing a permanent magnet to a rotor core in such an IPM motor for example, techniques described in Patent Literature 1 and Patent Literature 2 are known.
  • Patent Document 1 discloses a configuration in which a hole for caulking is provided on the outer diameter side of a rotor, the rotor core is caulked with a rivet pin, and the rotor core is deformed by pressing, thereby fixing the rotor core and the arc magnet in surface contact. ing.
  • Patent Literature 2 when viewed from the front of the rotor core, the rotor core and the permanent magnet are fixed by contacting the circumferential end surfaces of the arc magnet with support protrusions provided near both circumferential end portions of the magnet insertion hole. An arrangement is disclosed.
  • a permanent magnet having a curved surface such as a circular arc magnet
  • a flat plate magnet having a flat surface has low dimensional accuracy.
  • the magnet insertion hole In order to prevent the magnet insertion hole from coming into contact with the outer diameter side wall surface, the magnet insertion hole needs to be sufficiently larger than the arc magnet.
  • the larger the gap between the arc magnet and the magnet insertion hole the lower the output performance of the rotating electric machine.
  • the present invention provides a rotor for a rotating electrical machine that can prevent the occurrence of excessive centrifugal stress on the outer peripheral surface of a rotor core during rotation of the rotor while suppressing a decrease in output performance of the rotating electrical machine.
  • the present invention A substantially annular rotor core having a plurality of magnet insertion holes formed along a circumferential direction, A plurality of permanent magnets inserted into the plurality of magnet insertion holes,
  • the permanent magnet has an inner diameter side curved surface curved in a radially inward convex shape on the inner diameter surface, and an outer diameter side curved surface curved in a radially inward convex shape on the outer diameter surface
  • the magnet insertion hole has an inner diameter side wall surface facing the inner diameter side curved surface of the permanent magnet, and an outer diameter side wall surface facing the outer diameter side curved surface of the permanent magnet.
  • the permanent magnet has an inner diameter side flat portion at a circumferential center of the inner diameter side curved surface
  • the magnet insertion hole has an inner diameter side flat wall surface facing the inner diameter side flat portion of the permanent magnet on the inner diameter side wall surface, In a state where the inner diameter side flat portion of the permanent magnet and the inner diameter side flat wall surface of the magnet insertion hole are in direct or indirect contact with each other, at the circumferential center of the permanent magnet, A gap is provided between the outer diameter side curved surface and the outer diameter side wall surface of the magnet insertion hole.
  • the present invention it is possible to prevent the occurrence of excessive centrifugal stress on the outer peripheral surface of the rotor core during rotation of the rotor, while suppressing a decrease in output performance of the rotating electric machine.
  • FIG. 2 is a front view of the rotor of the rotary electric machine according to the first embodiment of the present invention.
  • FIG. 2 is an enlarged view around an outer diameter side magnet portion of FIG. 1. It is an enlarged drawing of the circumference of the outside diameter side magnet part of the rotor of the rotary electric machine of a 2nd embodiment of the present invention.
  • a rotor 10 of a rotary electric machine includes a rotor core 20 attached to an outer peripheral portion of a rotor shaft (not shown), and a plurality of rotor cores 20 formed inside the rotor core 20 at predetermined intervals in a circumferential direction. (In this embodiment, twelve), and is disposed on the inner peripheral side of a stator (not shown).
  • the rotor core 20 is formed by laminating a plurality of substantially annular electromagnetic steel sheets 200 having the same shape in the axial direction.
  • the rotor core 20 has a rotor shaft hole 21 that is concentric with the center of the circular ring C. Further, the center axis of each magnetic pole part 30 connecting the center of the circular ring C and the center of each magnetic pole part 30 is d-axis (d-axis in the figure), and the axis separated by 90 ° in electrical angle from the d-axis is q-axis.
  • the rotor core 20 has an outer diameter side magnet insertion hole 410 formed across the d axis on the outer diameter side of the rotor core 20 so as to correspond to each magnetic pole portion 30;
  • a pair of inner magnet-side magnet insertion holes 421 and 422 formed in a substantially C-shape extending radially outward across the d-axis on the inner-diameter side of the outer-magnet-side magnet insertion hole 410, and an inner-magnet-side magnet insertion hole 421. , 422, each having a pair of ribs 510, 520 extending in the radial direction, and a gap 60 formed between the pair of ribs 510, 520.
  • Each of the outer-diameter magnet insertion holes 410 and the inner-diameter magnet insertion holes 421 and 422 has an arc shape that is convex inward in the radial direction.
  • Each magnetic pole part 30 has a magnet part 300 including an outer diameter side magnet part 310 and an inner diameter side magnet part 320.
  • the outer diameter side magnet part 310 is inserted into the outer diameter side magnet insertion hole 410, and includes an outer diameter side permanent magnet 810 arranged so as to be convex inward in the radial direction.
  • the inner diameter side magnet part 320 is inserted into a pair of inner diameter side magnet insertion holes 421, 422, respectively, and is constituted by a pair of inner diameter side permanent magnets 821, 822 arranged so as to protrude radially inward.
  • the outer diameter side permanent magnet 810 and the pair of inner diameter side permanent magnets 821 and 822 are magnetized in the radial direction. Further, the outer diameter side permanent magnet 810 and the pair of inner diameter side permanent magnets 821 and 822 have different magnetization directions from the adjacent magnetic pole portions 30, and are arranged such that the magnetic pole portions 30 alternately have different magnetization directions in the circumferential direction. .
  • the pair of inner-diameter-side magnet insertion holes 421 and 422 are located on the left side with respect to the d axis.
  • the inner diameter side magnet insertion hole 421, the second inner diameter side magnet insertion hole 422 is disposed on the right side, and the pair of ribs 510 and 520 are arranged with the first rib 510 on the left side and the second rib 520 on the right side with the d axis interposed therebetween.
  • the pair of inner diameter side permanent magnets 821 and 822 have a first inner diameter side permanent magnet 821 on the left side and a second inner diameter side permanent magnet 822 on the right side with respect to the d-axis.
  • the distance D11 between the first inner permanent magnet 821 and the outer permanent magnet 810 and the distance D12 between the second inner permanent magnet 822 and the outer permanent magnet 810 are all changed from the q axis to the d axis. It gets longer as you get closer.
  • the rotor 10 can be prevented from increasing in size. Further, a magnetic path along the q-axis (hereinafter, also referred to as a q-axis magnetic path) in the rotor 10 can be widened and the reluctance torque of the rotating electric machine can be increased, so that the output performance of the rotating electric machine can be improved. Further, the magnetic flux generated by the first inner diameter side permanent magnet 821 and the second inner diameter side permanent magnet 822 and the outer diameter side permanent magnet 810 is easily concentrated on the d-axis, and the magnet torque of the rotating electric machine can be efficiently used. The output performance of the rotating electric machine can be improved.
  • the annular center C is defined as lower, and the outer diameter side in the d-axis direction is defined as upper. 2 and 3, the upper part of the rotor 10 is indicated by U, the lower part by D, the left side by L, and the right side by R.
  • the outer diameter side permanent magnet 810 has a circumferential central portion 810C, a circumferential left end portion 810L, and a circumferential right end portion 810R formed integrally with each other, and has a radial inner side having the same arc center C10.
  • an inner diameter side flat portion 815 formed in a direction substantially perpendicular to the d axis is provided at a circumferential central portion 810C of the inner diameter side curved surface 811 of the outer diameter side permanent magnet 810.
  • outer diameter side left end flat portion 816 and the outer diameter right right end flat portion 816 formed in a direction substantially perpendicular to the d-axis are provided on both circumferential end portions 810L and 810R of the outer diameter side curved surface 812 of the outer diameter side permanent magnet 810.
  • a part 817 is provided.
  • the inner diameter side flat portion 815 of the outer diameter side permanent magnet 810 is formed so as to cut out the circumferential central portion 810C of the inner diameter side curved surface 811 of the outer diameter side permanent magnet 810.
  • the outer-diameter magnet insertion hole 410 has an arc-shaped inner wall surface 411 that faces the inner-diameter curved surface 811 of the outer-diameter permanent magnet 810, and an arc that faces the outer-diameter curved surface 812 of the outer-diameter permanent magnet 810. It has an outer diameter side wall surface 412, a left wall surface 413, and a right wall surface 414. Further, an inner diameter side flat wall surface 415 facing the inner diameter side flat portion 815 of the outer diameter side permanent magnet 810 is provided at a circumferential center of the inner diameter side wall surface 411 of the outer diameter side magnet insertion hole 410.
  • the outer diameter side opposed to the outer diameter side left end flat portion 816 and the outer diameter side right end flat portion 817 of the outer diameter side permanent magnet 810 are provided at both circumferential ends of the outer diameter side wall surface 412 of the outer diameter side magnet insertion hole 410.
  • a side left end flat wall surface 416 and an outer diameter side right end flat wall surface 417 are provided.
  • the length L85 of the inner diameter side flat portion 815 of the outer diameter side permanent magnet 810 is shorter than the length L45 of the inner diameter side flat wall surface 415 of the outer diameter side magnet insertion hole 410.
  • the arc radius r10 of the outer diameter curved surface 812 of the outer diameter permanent magnet 810 is smaller than the arc radius r42 of the outer diameter side wall surface 412 of the outer diameter magnet insertion hole 410.
  • a foam sheet 90 is provided between the inner diameter side flat portion 815 of the outer diameter side permanent magnet 810 and the inner diameter side flat wall surface 415 of the outer diameter side magnet insertion hole 410.
  • the outer permanent magnet 810 is inserted into the outer magnet insertion hole 410 and foamed by heating or the like.
  • the sheet 90 is foamed.
  • the outer diameter side permanent magnet 810 is pressed to the outer diameter side, and the outer diameter side curved surface 812 is in contact with the outer diameter side wall surface 412 of the outer diameter side magnet insertion hole 410.
  • the length L85 of the inner diameter side flat portion 815 of the outer diameter side permanent magnet 810 is shorter than the length L45 of the inner diameter side flat wall surface 415 of the outer diameter side magnet insertion hole 410.
  • the inner diameter side flat portion 815 indirectly contacts the inner diameter side flat wall surface 415 of the outer diameter side magnet insertion hole 410 with the foam sheet 90 interposed therebetween.
  • the outer diameter side permanent magnet 810 can be easily inserted into the outer diameter side magnet insertion hole 410, and productivity is improved.
  • the foam sheet 90 is provided between the inner diameter side flat portion 815 of the outer diameter side permanent magnet 810 and the inner diameter side flat wall surface 415 of the outer diameter side magnet insertion hole 410, when the rotor 10 is manufactured, What is necessary is just to stick the foamed sheet 90 to the inner side flat part 815 of the radial side permanent magnet 810, the positioning of the foamed sheet 90 is easy, and productivity is improved.
  • an outer diameter side left end flat portion 816 and an outer diameter side right end flat portion 817 are provided at both circumferential end portions 810 ⁇ / b> L and 810 ⁇ / b> R of the outer diameter side curved surface 812 of the outer diameter side permanent magnet 810.
  • the outer diameter side left end flat wall surface 416 facing the outer diameter left end flat portion 816 and the outer diameter right end flat portion 817 of the outer diameter permanent magnet 810. Since the outer diameter side right end flat wall surface 417 is provided, when the outer diameter side permanent magnet 810 is pressed to the outer diameter side by foaming of the foam sheet 90, the outer diameter side permanent magnet 810 becomes the outer diameter side.
  • the left side flat end portion 816 and the outer side right end flat portion 817 are fixed to the rotor core 20 in a state of contacting the outer side left end flat wall surface 416 and the outer side right end flat wall surface 417 of the outer side magnet insertion hole 410. You.
  • outer diameter side permanent magnet 810 can be fixed to the rotor core 20 without having to inject resin or the like into the outer diameter side magnet insertion hole 410.
  • the outer diameter side permanent magnet 810 is pressed to the outer diameter side and fixed to the rotor core 20, the outer diameter side permanent magnet 810 can be disposed on the outer diameter side, and the output performance of the rotating electric machine can be improved. Can be improved.
  • the foamed sheet 90 is attached to the inner flat portion 815 of the outer permanent magnet 810, when the outer permanent magnet 810 is inserted into the outer magnet insertion hole 410 in manufacturing the rotor 10. In addition, the foam sheet 90 can be prevented from peeling off from the outer diameter side permanent magnet 810. Further, the positioning of the foam sheet 90 is easy when manufacturing the rotor 10, and the productivity is improved.
  • a gap G is formed between the outer curved surface 812 of the outer permanent magnet 810 and the outer wall surface 412 of the outer magnet insertion hole 410 at the center 810C in the circumferential direction of the outer permanent magnet 810. Is provided.
  • the outer diameter side permanent magnet 810 and the outer diameter side magnet insertion hole 410 do not come into contact with each other at the circumferential central portion 810C of the outer diameter side permanent magnet 810, so that the outer peripheral surface of the rotor core 20 is excessively large when the rotor 10 rotates. Generation of centrifugal stress can be avoided. Furthermore, the deformation of the outer diameter side permanent magnet 810 and the rotor core 20 can be allowed by the gap G, so that the thermal stress of the outer diameter side permanent magnet 810 and the rotor core 20 can be reduced.
  • the outer diameter side permanent magnet 810 is smaller than the arc radius r42 of the outer diameter side wall surface 412 of the outer diameter side magnet insertion hole 410, the outer diameter side permanent magnet At the circumferential center 810C of the magnet 810, a gap G is securely secured between the outer curved surface 812 of the outer permanent magnet 810 and the outer sidewall 412 of the outer magnet insertion hole 410. it can.
  • the inner diameter side flat portion 815, the outer diameter side left end flat portion 816, and the outer diameter side right end flat portion 817 of the outer diameter side permanent magnet 810 can be formed by any method, for example, by cutting a circular arc magnet. .
  • a flat surface can be processed with higher precision than a curved surface such as an arc shape. For this reason, the outer diameter side permanent magnet 810 having the inner diameter side flat portion 815, the outer diameter side left end flat portion 816, and the outer diameter side right end flat portion 817 has higher dimensional accuracy than a normal arc magnet.
  • the outer diameter side permanent magnet 810, the first inner diameter side permanent magnet 821, and the second inner diameter side permanent magnet 822 are formed by, for example, cutting a ring-shaped magnet formed by molding using a hot working process in the radial direction. Arc magnets can be used.
  • the crystal group of the ring-shaped magnet material that has been randomly oriented is radially oriented.
  • the compressive stress acts, and the crystal group of the ring-shaped magnet material is oriented in the same direction as the compressive stress direction.
  • an anisotropic ring-shaped magnet oriented in the radial direction is obtained.
  • the stress acting on the crystal group of the ring-shaped magnet material be uniform over the entire region.
  • the stress acting on the crystal group of the ring-shaped magnet material becomes non-uniform, and the degree of orientation of the ring-shaped magnet decreases. I will.
  • the thickness of the ring-shaped magnet material is not uniform, the stress acting on the crystals of the ring-shaped magnet material becomes uneven, and the degree of orientation of the ring-shaped magnet is reduced.
  • the value of (thickness of the ring-shaped magnet material) / (ring radius of the ring-shaped magnet material) must be within a predetermined range.
  • the plate thickness d21 of the first inner permanent magnet 821 and the plate thickness d22 of the second inner permanent magnet 822 are larger than the plate thickness d10 of the outer permanent magnet 810. Thereby, the magnet amount of the first inner diameter side permanent magnet 821 and the second inner diameter side permanent magnet 822 can be increased, and the magnet torque of the rotating electric machine can be increased, so that the output performance of the rotating electric machine can be improved.
  • the arc radius r21 of the first inner permanent magnet 821 and the second inner permanent magnet 822 are increased.
  • the arc radius r22 is larger than the arc radius r10 of the outer diameter side permanent magnet 810.
  • the arc radius r10 of the outer diameter side permanent magnet 810, the arc radius r21 of the first inner diameter side permanent magnet 821, and the arc radius r22 of the second inner diameter side permanent magnet 822 are the arc surfaces from the center of the arc to the inner circumference of the permanent magnet. Length.
  • d10 / r10 which is the ratio of the arc radius r10 of the outer diameter side permanent magnet 810 to the plate thickness d10 of the outer diameter side permanent magnet 810, the arc radius r21 of the first inner diameter side permanent magnet 821, and the first D21 / r21, which is the ratio of the plate thickness d21 of the inner diameter side permanent magnet 821, the arc radius r22 of the second inner side permanent magnet 822, and d22 / r, which is the ratio of the plate thickness d22 of the second inner side permanent magnet 822.
  • r22 is preferably substantially the same value within a predetermined range.
  • the arc radius r21 of the first inner permanent magnet 821 and the arc radius r22 of the second inner permanent magnet 822 are the same, and the plate thickness d21 of the first inner permanent magnet 821 and the second inner permanent magnet 821 are equal.
  • the plate thickness d22 of the magnets 822 is the same, and the first inner permanent magnet 821 and the second inner permanent magnet 822 have the same shape.
  • the inner diameter side flat portion 815 of the outer diameter side permanent magnet 810 of the first embodiment has a shape in which a circumferential central portion 810C of the inner diameter side curved surface 811 of the outer diameter side permanent magnet 810 is cut out.
  • the inner diameter side flat portion 815 of the outer diameter side permanent magnet 810 of this embodiment is formed so as to protrude radially inward from the inner diameter side curved surface 811 of the outer diameter side permanent magnet 810. ing.
  • the inner diameter side flat portion 815 can be formed without reducing the magnet amount of the outer diameter side permanent magnet 810, so that the inner diameter side flat portion 815 can be formed without lowering the output performance of the rotating electric machine. it can.
  • the inner radius side curved surface 811 and the outer radius side curved surface 812 of the outer radius side permanent magnet 810 are arcs having the same arc center C10 and projecting radially inward.
  • the arc radius of the inner diameter side curved surface 811 is larger than the arc radius of the outer diameter side curved surface 812. It may be a substantially crescent shape in which the plate thickness decreases from the central portion 810C in the direction toward both ends 810L and 810R in the circumferential direction.
  • the inner diameter side curved surface 811 and the outer diameter side curved surface 812 of the outer diameter side permanent magnet 810 are not limited to the arc shape, and may have any shape curved convexly inward in the radial direction. .
  • the outer diameter side permanent magnet 810 has been described.
  • the first inner diameter side permanent magnet 821 and the second inner diameter side permanent magnet 822 are similar to the outer diameter side permanent magnet 810. May be provided.
  • the first inner permanent magnet 821 and the second inner permanent magnet 822 of the inner magnet portion 320 can be omitted. That is, the magnet unit 300 may be composed of only the outer permanent magnet 810 of the outer magnet unit 310.
  • a substantially annular rotor core (rotor core 20) having a plurality of magnet insertion holes (outer diameter side magnet insertion holes 410) formed along the circumferential direction;
  • a plurality of permanent magnets (outside diameter permanent magnets 810) inserted into the plurality of magnet insertion holes,
  • the permanent magnet has an inner diameter side curved surface (inner diameter side curved surface 811) curved radially inwardly convex on the inner diameter surface, and an outer diameter side curved surface (outside diameter curved surface) curved radially inwardly convexly on the outer diameter surface. And a radially curved surface 812).
  • the magnet insertion hole has an inner diameter side wall surface (inner diameter side surface 411) facing the inner diameter side curved surface of the permanent magnet, and an outer diameter side wall surface (outside diameter side) facing the outer diameter side curved surface of the permanent magnet.
  • the permanent magnet has an inner diameter side flat portion (inner diameter side flat portion 815) at a circumferential center portion (a circumferential center portion 810C) of the inner diameter side curved surface
  • the magnet insertion hole has an inner diameter side flat wall surface (inner diameter side flat wall surface 415) facing the inner diameter side flat portion of the permanent magnet on the inner diameter side wall surface, In a state where the inner diameter side flat portion of the permanent magnet and the inner diameter side flat wall surface of the magnet insertion hole are in direct or indirect contact with each other, the permanent magnet is positioned at a circumferential central portion (a circumferential central portion 810C).
  • a gap is provided between the outer diameter side curved surface of the permanent magnet and the outer diameter side wall surface of the magnet insertion hole at the circumferential center of the permanent magnet. At the center in the circumferential direction, the permanent magnet does not contact the magnet insertion hole. Thereby, it is possible to avoid occurrence of excessive centrifugal stress on the outer peripheral surface of the rotor core when the rotor rotates. Further, since the deformation of the permanent magnet and the rotor core can be allowed by the gap, the thermal stress of the permanent magnet and the rotor core can be reduced.
  • the inner diameter surface of the permanent magnet has an inner diameter side flat surface provided at a circumferential center portion, and the inner diameter side wall surface of the magnet insertion hole is provided at an inner diameter flat surface provided at a circumferential center portion of the magnet insertion hole. Having. Since the flat surface can be processed with high accuracy, the dimensional accuracy of the permanent magnet and the magnet insertion hole is improved. As a result, the magnet insertion hole can be made smaller, and a decrease in output performance of the rotating electric machine can be suppressed.
  • the length of the inner diameter side flat portion of the permanent magnet is shorter than the length of the inner diameter side flat wall surface of the magnet insertion hole, so that the permanent magnet is inserted into the outer diameter side magnet insertion hole. And the productivity is improved.
  • the inner diameter side flat portion of the permanent magnet is reliably directly or indirectly magnetized. It comes into contact with the flat wall surface on the inner diameter side of the insertion hole. This stabilizes the contact surface between the inner-diameter flat portion of the permanent magnet and the inner-diameter flat wall surface of the magnet insertion hole, thereby reducing the variation in the position where the permanent magnet is fixed to the rotor core.
  • the foamed sheet is provided between the inner diameter side flat portion of the permanent magnet and the inner diameter side flat wall surface of the magnet insertion hole, the positioning of the foamed sheet is easy in manufacturing the rotor. , And productivity is improved. Furthermore, since the foam sheet arranged on the flat surface foams, it is possible to reduce variation in the position where the permanent magnet abuts on the outer diameter side wall surface of the magnet insertion hole. Thus, it is possible to reduce variation in the position where the permanent magnet is fixed to the rotor core.
  • the rotor of the rotary electric machine according to any one of (1) to (3),
  • the outer diameter side curved surface of the permanent magnet has a circular arc shape convex toward the radially inward side
  • the outer diameter side wall surface of the magnet insertion hole has an arc shape convex toward the radially inward side
  • the rotor of the rotating electric machine wherein an arc radius (arc radius r10) of the outer diameter side curved surface of the permanent magnet is smaller than an arc radius (arc radius r42) of the outer diameter side wall surface of the magnet insertion hole.
  • the radius of the arc of the outer diameter side curved surface of the permanent magnet is smaller than the radius of the arc of the outer diameter side wall surface of the magnet insertion hole. Between the outer diameter side curved surface and the outer diameter side wall surface of the magnet insertion hole.
  • outer diameter side flat portions (outer diameter left end flat portion 816, outer diameter right right end flat portion 817) are provided.
  • a rotor of a rotating electric machine wherein outer peripheral side flat wall surfaces (outer radial side left end flat wall surface 416, outer radial side right end flat wall surface 417) are provided at both circumferential end portions of the outer diameter side wall surface of the magnet insertion hole. .
  • outer diameter side flat surfaces are provided at both ends in the circumferential direction of the outer diameter side curved surface of the permanent magnet, and at both ends in the circumferential direction of the outer diameter side wall surface of the magnet insertion hole, Since the outer diameter side flat wall surface is provided, when the permanent magnet moves to the outer diameter side, the outer diameter side flat portion of the permanent magnet comes into contact with the outer diameter side flat wall surface of the magnet insertion hole. Thereby, the variation in the position where the permanent magnet contacts the magnet insertion hole can be reduced, and the variation in the position where the permanent magnet is fixed to the rotor core can be reduced.
  • the flat portion on the inner diameter side of the permanent magnet is formed so as to protrude radially inward from the curved surface on the inner diameter side of the permanent magnet.
  • a part can be formed.
  • Rotor 20 Rotor core 410 Outer diameter side magnet insertion hole (magnet insertion hole) 411 inner diameter side wall surface 412 outer diameter side wall surface 415 inner diameter side flat wall surface 416 outer diameter side left end flat wall surface (outer diameter side flat wall surface) 417 Outer diameter side right end flat wall surface (outer diameter side flat wall surface) 810 Outer diameter side permanent magnet (permanent magnet) 810C Circumferential center part 810L Circumferential left end (both circumferential ends) 810R Circumferential right end (circumferential ends) 811 inner diameter side curved surface 812 outer diameter side curved surface 815 inner diameter side flat portion 816 outer diameter side left end flat portion (outside diameter flat portion) 817 Outer diameter side right end flat part (outer diameter side flat part) 90 Foam sheet G Gap L45, L85 Length r10, r42 Arc radius

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

A rotor (10) of an electric rotary machine is provided with: a rotor core (20) having a magnet insertion hole (410); and a permanent magnet (810). The permanent magnet (810) has an inner-diameter-side flat section (815) at a circumferential center section (810C) of an inner-diameter-side curved surface (811). The magnet insertion hole (410) has an inner-diameter-side flat wall surface (415) facing the inner-diameter-side flat section (815) of the permanent magnet (810). A gap section (G) is provided between an outer-diameter-side curved surface (812) of the permanent magnet (810) and an outer-diameter-side wall surface (412) of the magnet insertion hole (410) at the circumferential center section (810C) of the permanent magnet (810).

Description

回転電機のロータRotating electric machine rotor
　本発明は、電動車両などに搭載される回転電機のロータに関する。 The present invention relates to a rotor of a rotating electric machine mounted on an electric vehicle or the like.
　従来から、回転電機に使用されるロータとして、ロータコアの内部に周方向に所定の間隔で複数個の永久磁石を配置した、いわゆるＩＰＭモータが知られている。このようなＩＰＭモータにおいて、永久磁石をロータコアに固定するための手段として、例えば、特許文献１や特許文献２に記載された技術が知られている。 Conventionally, a so-called IPM motor in which a plurality of permanent magnets are arranged at predetermined intervals in a circumferential direction inside a rotor core has been known as a rotor used in a rotating electric machine. As a means for fixing a permanent magnet to a rotor core in such an IPM motor, for example, techniques described in Patent Literature 1 and Patent Literature 2 are known.
　特許文献１には、ロータ外径側にかしめ用の孔を設け、ロータコアをリベットピンでかしめると同時に押圧によりロータコアを変形させることで、ロータコアと円弧磁石を面接触で固定する構成が開示されている。 Patent Document 1 discloses a configuration in which a hole for caulking is provided on the outer diameter side of a rotor, the rotor core is caulked with a rivet pin, and the rotor core is deformed by pressing, thereby fixing the rotor core and the arc magnet in surface contact. ing.
　特許文献２には、ロータコアの正面から見て、磁石挿入孔の周方向両端部付近に設けられた支持突起に円弧磁石の周方向両端面を当接させることで、ロータコアと永久磁石を固定する構成が開示されている。 In Patent Literature 2, when viewed from the front of the rotor core, the rotor core and the permanent magnet are fixed by contacting the circumferential end surfaces of the arc magnet with support protrusions provided near both circumferential end portions of the magnet insertion hole. An arrangement is disclosed.
日本国特開２００７－３０６６８８号公報Japanese Patent Application Laid-Open No. 2007-306688 日本国特開２０１４－１０００４８号公報Japanese Patent Application Laid-Open No. 2014-100048
　しかしながら、特許文献１及び特許文献２の回転電機のロータでは、円弧磁石の周方向中央部において、円弧磁石の外径面とロータコアの磁石挿入孔の外径側壁面とが当接する。そのため、円弧磁石に製造誤差があると、ロータが高速で回転する際に、永久磁石の遠心力により、ロータコアの外周面に過大な応力が発生する虞があった。 However, in the rotors of the rotating electric machines disclosed in Patent Documents 1 and 2, the outer diameter surface of the arc magnet and the outer diameter side wall surface of the magnet insertion hole of the rotor core abut at the center in the circumferential direction of the arc magnet. Therefore, if there is a manufacturing error in the arc magnet, when the rotor rotates at high speed, the centrifugal force of the permanent magnet may cause excessive stress on the outer peripheral surface of the rotor core.
　一方で、円弧磁石等の湾曲面を有する永久磁石は、平坦面からなる平板磁石よりも加工が難しく、寸法精度が低いため、円弧磁石の周方向中央部において、円弧磁石の外径面とロータコアの磁石挿入孔の外径側壁面とが当接しないようにするためには、磁石挿入孔を円弧磁石よりも十分に大きくする必要がある。しかし、円弧磁石と磁石挿入孔との間の隙間が大きくなるほど、回転電機の出力性能が低下してしまう。 On the other hand, a permanent magnet having a curved surface, such as a circular arc magnet, is more difficult to process than a flat plate magnet having a flat surface, and has low dimensional accuracy. In order to prevent the magnet insertion hole from coming into contact with the outer diameter side wall surface, the magnet insertion hole needs to be sufficiently larger than the arc magnet. However, the larger the gap between the arc magnet and the magnet insertion hole, the lower the output performance of the rotating electric machine.
　本発明は、回転電機の出力性能の低下を抑制しつつ、ロータの回転時に、ロータコアの外周面に過大な遠心応力が発生するのを回避できる回転電機のロータを提供する。 The present invention provides a rotor for a rotating electrical machine that can prevent the occurrence of excessive centrifugal stress on the outer peripheral surface of a rotor core during rotation of the rotor while suppressing a decrease in output performance of the rotating electrical machine.
　本発明は、
周方向に沿って形成された複数の磁石挿入孔を有する略円環形状のロータコアと、
　前記複数の磁石挿入孔に挿入された複数の永久磁石と、を備え、
　前記永久磁石は、内径面に径方向内側に凸状に湾曲した内径側湾曲面と、外径面に径方向内側に凸状に湾曲した外径側湾曲面と、を有し、
　前記磁石挿入孔は、前記永久磁石の前記内径側湾曲面と対向する内径側壁面と、前記永久磁石の前記外径側湾曲面と対向する外径側壁面と、を有する、回転電機のロータであって、
　前記永久磁石は、前記内径側湾曲面の周方向中央部に内径側平坦部を有し、
　前記磁石挿入孔は、前記内径側壁面に前記永久磁石の前記内径側平坦部と対向する内径側平坦壁面を有し、
　前記永久磁石の前記内径側平坦部と前記磁石挿入孔の前記内径側平坦壁面とが、直接又は間接的に当接した状態で、前記永久磁石の周方向中央部には、前記永久磁石の前記外径側湾曲面と前記磁石挿入孔の前記外径側壁面との間に隙間部が設けられている。 The present invention
A substantially annular rotor core having a plurality of magnet insertion holes formed along a circumferential direction,
A plurality of permanent magnets inserted into the plurality of magnet insertion holes,
The permanent magnet has an inner diameter side curved surface curved in a radially inward convex shape on the inner diameter surface, and an outer diameter side curved surface curved in a radially inward convex shape on the outer diameter surface,
The magnet insertion hole has an inner diameter side wall surface facing the inner diameter side curved surface of the permanent magnet, and an outer diameter side wall surface facing the outer diameter side curved surface of the permanent magnet. So,
The permanent magnet has an inner diameter side flat portion at a circumferential center of the inner diameter side curved surface,
The magnet insertion hole has an inner diameter side flat wall surface facing the inner diameter side flat portion of the permanent magnet on the inner diameter side wall surface,
In a state where the inner diameter side flat portion of the permanent magnet and the inner diameter side flat wall surface of the magnet insertion hole are in direct or indirect contact with each other, at the circumferential center of the permanent magnet, A gap is provided between the outer diameter side curved surface and the outer diameter side wall surface of the magnet insertion hole.
　本発明によれば、回転電機の出力性能の低下を抑制しつつ、ロータの回転時に、ロータコアの外周面に過大な遠心応力が発生するのを回避できる。 According to the present invention, it is possible to prevent the occurrence of excessive centrifugal stress on the outer peripheral surface of the rotor core during rotation of the rotor, while suppressing a decrease in output performance of the rotating electric machine.
本発明の第１実施形態の回転電機のロータの正面図である。FIG. 2 is a front view of the rotor of the rotary electric machine according to the first embodiment of the present invention. 図１の外径側磁石部周辺の拡大図である。FIG. 2 is an enlarged view around an outer diameter side magnet portion of FIG. 1. 本発明の第２実施形態の回転電機のロータの外径側磁石部周辺の拡大図である。It is an enlarged drawing of the circumference of the outside diameter side magnet part of the rotor of the rotary electric machine of a 2nd embodiment of the present invention.
　以下、本発明の回転電機のロータの各実施形態を、添付図面に基づいて説明する。 Hereinafter, embodiments of the rotor of the rotating electric machine according to the present invention will be described with reference to the accompanying drawings.
　まず、本発明の第１実施形態の回転電機のロータについて図１～図２を参照しながら説明する。 First, the rotor of the rotary electric machine according to the first embodiment of the present invention will be described with reference to FIGS.
　図１に示すように、一実施形態の回転電機のロータ１０は、ロータシャフト（不図示）の外周部に取り付けられるロータコア２０と、ロータコア２０の内部に周方向に所定の間隔で形成された複数の磁極部３０（本実施形態では１２個）と、を備え、ステータ（不図示）の内周側に配置されている。 As shown in FIG. 1, a rotor 10 of a rotary electric machine according to one embodiment includes a rotor core 20 attached to an outer peripheral portion of a rotor shaft (not shown), and a plurality of rotor cores 20 formed inside the rotor core 20 at predetermined intervals in a circumferential direction. (In this embodiment, twelve), and is disposed on the inner peripheral side of a stator (not shown).
　ロータコア２０は、同一形状の略円環状の電磁鋼板２００が軸方向に複数積層されて形成されている。ロータコア２０は、円環中心Ｃと同中心のロータシャフト孔２１を有する。さらに、円環中心Ｃと各磁極部３０の中心とを結ぶ、各磁極部３０の中心軸をｄ軸（図中ｄ－ａｘｉｓ）、ｄ軸に対し電気角で９０°隔てた軸をｑ軸（図中ｑ－ａｘｉｓ）とした場合、ロータコア２０は、各磁極部３０に対応するように、ロータコア２０の外径側にｄ軸を横切るように形成された外径側磁石挿入孔４１０と、外径側磁石挿入孔４１０の内径側にｄ軸を挟んで径方向外側に向かって広がる略ハの字状に形成された一対の内径側磁石挿入孔４２１、４２２と、内径側磁石挿入孔４２１、４２２のｄ軸側端部に形成され、それぞれ径方向に延びる一対のリブ５１０、５２０と、一対のリブ５１０、５２０間に形成された空隙部６０と、を有する。外径側磁石挿入孔４１０及び内径側磁石挿入孔４２１、４２２は、いずれも径方向内側に凸となる円弧形状を有する。 The rotor core 20 is formed by laminating a plurality of substantially annular electromagnetic steel sheets 200 having the same shape in the axial direction. The rotor core 20 has a rotor shaft hole 21 that is concentric with the center of the circular ring C. Further, the center axis of each magnetic pole part 30 connecting the center of the circular ring C and the center of each magnetic pole part 30 is d-axis (d-axis in the figure), and the axis separated by 90 ° in electrical angle from the d-axis is q-axis. In the case of (q-axis in the drawing), the rotor core 20 has an outer diameter side magnet insertion hole 410 formed across the d axis on the outer diameter side of the rotor core 20 so as to correspond to each magnetic pole portion 30; A pair of inner magnet-side magnet insertion holes 421 and 422 formed in a substantially C-shape extending radially outward across the d-axis on the inner-diameter side of the outer-magnet-side magnet insertion hole 410, and an inner-magnet-side magnet insertion hole 421. , 422, each having a pair of ribs 510, 520 extending in the radial direction, and a gap 60 formed between the pair of ribs 510, 520. Each of the outer-diameter magnet insertion holes 410 and the inner-diameter magnet insertion holes 421 and 422 has an arc shape that is convex inward in the radial direction.
　各磁極部３０は、外径側磁石部３１０及び内径側磁石部３２０を含む磁石部３００を有する。外径側磁石部３１０は、外径側磁石挿入孔４１０に挿入され、径方向内側に凸となるように配置された外径側永久磁石８１０から構成される。内径側磁石部３２０は、一対の内径側磁石挿入孔４２１、４２２にそれぞれ挿入され、径方向内側に凸となるように配置された一対の内径側永久磁石８２１、８２２から構成される。 Each magnetic pole part 30 has a magnet part 300 including an outer diameter side magnet part 310 and an inner diameter side magnet part 320. The outer diameter side magnet part 310 is inserted into the outer diameter side magnet insertion hole 410, and includes an outer diameter side permanent magnet 810 arranged so as to be convex inward in the radial direction. The inner diameter side magnet part 320 is inserted into a pair of inner diameter side magnet insertion holes 421, 422, respectively, and is constituted by a pair of inner diameter side permanent magnets 821, 822 arranged so as to protrude radially inward.
　外径側永久磁石８１０及び一対の内径側永久磁石８２１、８２２は、径方向に磁化されている。また、外径側永久磁石８１０及び一対の内径側永久磁石８２１、８２２は、隣り合う磁極部３０と磁化方向が異なり、磁極部３０が周方向で交互に磁化方向が異なるように配置されている。 The outer diameter side permanent magnet 810 and the pair of inner diameter side permanent magnets 821 and 822 are magnetized in the radial direction. Further, the outer diameter side permanent magnet 810 and the pair of inner diameter side permanent magnets 821 and 822 have different magnetization directions from the adjacent magnetic pole portions 30, and are arranged such that the magnetic pole portions 30 alternately have different magnetization directions in the circumferential direction. .
　ここで、ロータ１０の正面視において、円環中心Ｃを下方、ｄ軸方向外径側を上方として見て、一対の内径側磁石挿入孔４２１、４２２は、ｄ軸に対して左側に第１内径側磁石挿入孔４２１、右側に第２内径側磁石挿入孔４２２が配置され、一対のリブ５１０、５２０は、ｄ軸を挟んで左側に第１リブ５１０、右側に第２リブ５２０が配置され、一対の内径側永久磁石８２１、８２２は、ｄ軸を挟んで左側に第１内径側永久磁石８２１、右側に第２内径側永久磁石８２２が配置されている。 Here, in the front view of the rotor 10, when the annular center C is viewed downward and the outer diameter side in the d-axis direction is viewed upward, the pair of inner-diameter-side magnet insertion holes 421 and 422 are located on the left side with respect to the d axis. The inner diameter side magnet insertion hole 421, the second inner diameter side magnet insertion hole 422 is disposed on the right side, and the pair of ribs 510 and 520 are arranged with the first rib 510 on the left side and the second rib 520 on the right side with the d axis interposed therebetween. The pair of inner diameter side permanent magnets 821 and 822 have a first inner diameter side permanent magnet 821 on the left side and a second inner diameter side permanent magnet 822 on the right side with respect to the d-axis.
　さらに、第１内径側永久磁石８２１と外径側永久磁石８１０との距離Ｄ１１及び第２内径側永久磁石８２２と外径側永久磁石８１０との距離Ｄ１２は、いずれも、ｑ軸からｄ軸に近づくに従って長くなっている。 Further, the distance D11 between the first inner permanent magnet 821 and the outer permanent magnet 810 and the distance D12 between the second inner permanent magnet 822 and the outer permanent magnet 810 are all changed from the q axis to the d axis. It gets longer as you get closer.
　これにより、磁極部３０の周方向長さが大きくなることを抑制できるので、ロータ１０が大型化するのを抑制できる。また、ロータ１０におけるｑ軸に沿った磁路（以下、ｑ軸磁路とも呼ぶ）を広くとることができ、回転電機のリラクタンストルクを大きくできるので、回転電機の出力性能を向上できる。さらに、第１内径側永久磁石８２１及び第２内径側永久磁石８２２と、外径側永久磁石８１０とによるマグネット磁束がｄ軸に集約されやすくなり、回転電機のマグネットトルクを効率的に利用でき、回転電機の出力性能を向上できる。 (4) Since the circumferential length of the magnetic pole portion 30 can be suppressed from increasing, the rotor 10 can be prevented from increasing in size. Further, a magnetic path along the q-axis (hereinafter, also referred to as a q-axis magnetic path) in the rotor 10 can be widened and the reluctance torque of the rotating electric machine can be increased, so that the output performance of the rotating electric machine can be improved. Further, the magnetic flux generated by the first inner diameter side permanent magnet 821 and the second inner diameter side permanent magnet 822 and the outer diameter side permanent magnet 810 is easily concentrated on the d-axis, and the magnet torque of the rotating electric machine can be efficiently used. The output performance of the rotating electric machine can be improved.
　以降、本明細書等では説明を簡単且つ明確にするために、ロータ１０の正面視において、円環中心Ｃを下方、ｄ軸方向外径側を上方と定義して説明する。図２～３には、ロータ１０の上方をＵ、下方をＤ、左側をＬ、右側をＲ、として示す。 Hereinafter, in the present specification and the like, for simplicity and clarity of description, in the front view of the rotor 10, the annular center C is defined as lower, and the outer diameter side in the d-axis direction is defined as upper. 2 and 3, the upper part of the rotor 10 is indicated by U, the lower part by D, the left side by L, and the right side by R.
　図２に示すように、外径側永久磁石８１０は、周方向中央部８１０Ｃと、周方向左端部８１０Ｌと、周方向右端部８１０Ｒとが一体に形成され、同じ円弧中心Ｃ１０を有する径方向内側に向かって凸状の円弧形状の内径側湾曲面８１１及び外径側湾曲面８１２と、左側端面８１３と、右側端面８１４と、を有する。さらに、外径側永久磁石８１０の内径側湾曲面８１１の周方向中央部８１０Ｃには、ｄ軸と略直交する向きに形成された内径側平坦部８１５が設けられている。また、外径側永久磁石８１０の外径側湾曲面８１２の周方向両端部８１０Ｌ、８１０Ｒには、ｄ軸と略直交する向きに形成された外径側左端平坦部８１６及び外径側右端平坦部８１７が設けられている。本実施形態において、外径側永久磁石８１０の内径側平坦部８１５は、外径側永久磁石８１０の内径側湾曲面８１１の周方向中央部８１０Ｃを切り欠くように形成されている。 As shown in FIG. 2, the outer diameter side permanent magnet 810 has a circumferential central portion 810C, a circumferential left end portion 810L, and a circumferential right end portion 810R formed integrally with each other, and has a radial inner side having the same arc center C10. An inner diameter side curved surface 811 and an outer diameter side curved surface 812 having an arc shape convex toward the right side, a left end surface 813, and a right end surface 814. Furthermore, an inner diameter side flat portion 815 formed in a direction substantially perpendicular to the d axis is provided at a circumferential central portion 810C of the inner diameter side curved surface 811 of the outer diameter side permanent magnet 810. In addition, the outer diameter side left end flat portion 816 and the outer diameter right right end flat portion 816 formed in a direction substantially perpendicular to the d-axis are provided on both circumferential end portions 810L and 810R of the outer diameter side curved surface 812 of the outer diameter side permanent magnet 810. A part 817 is provided. In the present embodiment, the inner diameter side flat portion 815 of the outer diameter side permanent magnet 810 is formed so as to cut out the circumferential central portion 810C of the inner diameter side curved surface 811 of the outer diameter side permanent magnet 810.
　外径側磁石挿入孔４１０は、外径側永久磁石８１０の内径側湾曲面８１１と対向する円弧形状の内径側壁面４１１と、外径側永久磁石８１０の外径側湾曲面８１２と対向する円弧形状の外径側壁面４１２と、左側壁面４１３と、右側壁面４１４と、を有する。さらに、外径側磁石挿入孔４１０の内径側壁面４１１の周方向中央部には、外径側永久磁石８１０の内径側平坦部８１５と対向する内径側平坦壁面４１５が設けられている。また、外径側磁石挿入孔４１０の外径側壁面４１２の周方向両端部には、外径側永久磁石８１０の外径側左端平坦部８１６及び外径側右端平坦部８１７と対向する外径側左端平坦壁面４１６及び外径側右端平坦壁面４１７が設けられている。 The outer-diameter magnet insertion hole 410 has an arc-shaped inner wall surface 411 that faces the inner-diameter curved surface 811 of the outer-diameter permanent magnet 810, and an arc that faces the outer-diameter curved surface 812 of the outer-diameter permanent magnet 810. It has an outer diameter side wall surface 412, a left wall surface 413, and a right wall surface 414. Further, an inner diameter side flat wall surface 415 facing the inner diameter side flat portion 815 of the outer diameter side permanent magnet 810 is provided at a circumferential center of the inner diameter side wall surface 411 of the outer diameter side magnet insertion hole 410. The outer diameter side opposed to the outer diameter side left end flat portion 816 and the outer diameter side right end flat portion 817 of the outer diameter side permanent magnet 810 are provided at both circumferential ends of the outer diameter side wall surface 412 of the outer diameter side magnet insertion hole 410. A side left end flat wall surface 416 and an outer diameter side right end flat wall surface 417 are provided.
　ここで、外径側永久磁石８１０の内径側平坦部８１５の長さＬ８５は、外径側磁石挿入孔４１０の内径側平坦壁面４１５の長さＬ４５よりも短くなっている。また、外径側永久磁石８１０の外径側湾曲面８１２の円弧半径ｒ１０は、外径側磁石挿入孔４１０の外径側壁面４１２の円弧半径ｒ４２よりも小さくなっている。 Here, the length L85 of the inner diameter side flat portion 815 of the outer diameter side permanent magnet 810 is shorter than the length L45 of the inner diameter side flat wall surface 415 of the outer diameter side magnet insertion hole 410. The arc radius r10 of the outer diameter curved surface 812 of the outer diameter permanent magnet 810 is smaller than the arc radius r42 of the outer diameter side wall surface 412 of the outer diameter magnet insertion hole 410.
　さらに、外径側永久磁石８１０の内径側平坦部８１５と、外径側磁石挿入孔４１０の内径側平坦壁面４１５との間には、発泡シート９０が設けられている。 発 泡 Furthermore, a foam sheet 90 is provided between the inner diameter side flat portion 815 of the outer diameter side permanent magnet 810 and the inner diameter side flat wall surface 415 of the outer diameter side magnet insertion hole 410.
　ロータ１０の製造の際、外径側永久磁石８１０の内径側平坦部８１５に発泡シート９０を貼付した後、外径側永久磁石８１０を外径側磁石挿入孔４１０に挿入し、加熱等により発泡シート９０を発泡させる。発泡シート９０が発泡することによって、外径側永久磁石８１０は、外径側に押圧され、外径側湾曲面８１２が外径側磁石挿入孔４１０の外径側壁面４１２と当接した状態で、ロータコア２０に固定される。 At the time of manufacturing the rotor 10, after the foam sheet 90 is attached to the flat portion 815 on the inner diameter side of the outer permanent magnet 810, the outer permanent magnet 810 is inserted into the outer magnet insertion hole 410 and foamed by heating or the like. The sheet 90 is foamed. When the foam sheet 90 foams, the outer diameter side permanent magnet 810 is pressed to the outer diameter side, and the outer diameter side curved surface 812 is in contact with the outer diameter side wall surface 412 of the outer diameter side magnet insertion hole 410. Are fixed to the rotor core 20.
　外径側永久磁石８１０の内径側平坦部８１５の長さＬ８５は、外径側磁石挿入孔４１０の内径側平坦壁面４１５の長さＬ４５よりも短くなっているので、外径側永久磁石８１０の内径側平坦部８１５は、発泡シート９０を挟んで、間接的に外径側磁石挿入孔４１０の内径側平坦壁面４１５と当接する。 The length L85 of the inner diameter side flat portion 815 of the outer diameter side permanent magnet 810 is shorter than the length L45 of the inner diameter side flat wall surface 415 of the outer diameter side magnet insertion hole 410. The inner diameter side flat portion 815 indirectly contacts the inner diameter side flat wall surface 415 of the outer diameter side magnet insertion hole 410 with the foam sheet 90 interposed therebetween.
　これにより、外径側永久磁石８１０の内径側平坦部８１５と外径側磁石挿入孔４１０の内径側平坦壁面４１５との当接面が安定するので、外径側永久磁石８１０がロータコア２０に固定される位置のバラつきを低減できる。 As a result, the contact surface between the inner diameter side flat portion 815 of the outer diameter side permanent magnet 810 and the inner diameter side flat wall surface 415 of the outer diameter side magnet insertion hole 410 is stabilized, so that the outer diameter side permanent magnet 810 is fixed to the rotor core 20. The variation in the position to be performed can be reduced.
　また、外径側永久磁石８１０の内径側平坦部８１５の長さＬ８５は、外径側磁石挿入孔４１０の内径側平坦壁面４１５の長さＬ４５よりも短くなっているので、外径側永久磁石８１０を外径側磁石挿入孔４１０に挿入するのが容易となり、生産性が向上する。 Further, since the length L85 of the inner diameter side flat portion 815 of the outer diameter side permanent magnet 810 is shorter than the length L45 of the inner diameter side flat wall surface 415 of the outer diameter side magnet insertion hole 410, the outer diameter side permanent magnet 810 can be easily inserted into the outer diameter side magnet insertion hole 410, and productivity is improved.
　また、発泡シート９０は、外径側永久磁石８１０の内径側平坦部８１５と、外径側磁石挿入孔４１０の内径側平坦壁面４１５との間に設けられるので、ロータ１０の製造の際、外径側永久磁石８１０の内径側平坦部８１５に発泡シート９０を貼付すればよく、発泡シート９０の位置決めが容易であり、生産性が向上する。 Further, since the foam sheet 90 is provided between the inner diameter side flat portion 815 of the outer diameter side permanent magnet 810 and the inner diameter side flat wall surface 415 of the outer diameter side magnet insertion hole 410, when the rotor 10 is manufactured, What is necessary is just to stick the foamed sheet 90 to the inner side flat part 815 of the radial side permanent magnet 810, the positioning of the foamed sheet 90 is easy, and productivity is improved.
　さらに、外径側永久磁石８１０の外径側湾曲面８１２の周方向両端部８１０Ｌ、８１０Ｒには、外径側左端平坦部８１６及び外径側右端平坦部８１７が設けられており、外径側磁石挿入孔４１０の外径側壁面４１２の周方向両端部には、外径側永久磁石８１０の外径側左端平坦部８１６及び外径側右端平坦部８１７と対向する外径側左端平坦壁面４１６及び外径側右端平坦壁面４１７が設けられているので、発泡シート９０が発泡することによって、外径側永久磁石８１０が外径側に押圧されると、外径側永久磁石８１０は、外径側左端平坦部８１６及び外径側右端平坦部８１７が、外径側磁石挿入孔４１０の外径側左端平坦壁面４１６及び外径側右端平坦壁面４１７と当接した状態で、ロータコア２０に固定される。 Further, an outer diameter side left end flat portion 816 and an outer diameter side right end flat portion 817 are provided at both circumferential end portions 810 </ b> L and 810 </ b> R of the outer diameter side curved surface 812 of the outer diameter side permanent magnet 810. At both ends in the circumferential direction of the outer diameter side wall surface 412 of the magnet insertion hole 410, the outer diameter side left end flat wall surface 416 facing the outer diameter left end flat portion 816 and the outer diameter right end flat portion 817 of the outer diameter permanent magnet 810. Since the outer diameter side right end flat wall surface 417 is provided, when the outer diameter side permanent magnet 810 is pressed to the outer diameter side by foaming of the foam sheet 90, the outer diameter side permanent magnet 810 becomes the outer diameter side. The left side flat end portion 816 and the outer side right end flat portion 817 are fixed to the rotor core 20 in a state of contacting the outer side left end flat wall surface 416 and the outer side right end flat wall surface 417 of the outer side magnet insertion hole 410. You.
　これにより、外径側永久磁石８１０が外径側磁石挿入孔４１０と当接する位置のバラつきを低減できる。さらに、内径側平坦部８１５に貼付された発泡シート９０が発泡するので、外径側永久磁石８１０の外径側への押圧方向のバラつきを低減できる。したがって、外径側永久磁石８１０がロータコア２０に固定される位置のバラつきを低減できる。 に よ り Thereby, the variation in the position where the outer diameter side permanent magnet 810 contacts the outer diameter side magnet insertion hole 410 can be reduced. Further, since the foam sheet 90 attached to the inner diameter side flat portion 815 foams, it is possible to reduce variation in the pressing direction of the outer diameter side permanent magnet 810 toward the outer diameter side. Therefore, variation in the position where the outer diameter side permanent magnet 810 is fixed to the rotor core 20 can be reduced.
　また、外径側磁石挿入孔４１０に樹脂等を注入する必要なく、外径側永久磁石８１０をロータコア２０に固定することができる。 Further, the outer diameter side permanent magnet 810 can be fixed to the rotor core 20 without having to inject resin or the like into the outer diameter side magnet insertion hole 410.
　また、外径側永久磁石８１０は、外径側に押圧されて、ロータコア２０に固定されているので、外径側永久磁石８１０をより外径側に配置することができ、回転電機の出力性能を向上できる。 Further, since the outer diameter side permanent magnet 810 is pressed to the outer diameter side and fixed to the rotor core 20, the outer diameter side permanent magnet 810 can be disposed on the outer diameter side, and the output performance of the rotating electric machine can be improved. Can be improved.
　また、発泡シート９０は、外径側永久磁石８１０の内径側平坦部８１５に貼付されているので、ロータ１０の製造において、外径側永久磁石８１０を外径側磁石挿入孔４１０に挿入する際に、発泡シート９０が外径側永久磁石８１０から剥がれるのを防止できる。また、ロータ１０の製造の際に発泡シート９０の位置決めが容易であり、生産性が向上する。 In addition, since the foamed sheet 90 is attached to the inner flat portion 815 of the outer permanent magnet 810, when the outer permanent magnet 810 is inserted into the outer magnet insertion hole 410 in manufacturing the rotor 10. In addition, the foam sheet 90 can be prevented from peeling off from the outer diameter side permanent magnet 810. Further, the positioning of the foam sheet 90 is easy when manufacturing the rotor 10, and the productivity is improved.
　外径側永久磁石８１０の周方向中央部８１０Ｃには、外径側永久磁石８１０の外径側湾曲面８１２と、外径側磁石挿入孔４１０の外径側壁面４１２との間に隙間部Ｇが設けられている。 A gap G is formed between the outer curved surface 812 of the outer permanent magnet 810 and the outer wall surface 412 of the outer magnet insertion hole 410 at the center 810C in the circumferential direction of the outer permanent magnet 810. Is provided.
　これにより、外径側永久磁石８１０の周方向中央部８１０Ｃにおいて、外径側永久磁石８１０と外径側磁石挿入孔４１０は接触しないので、ロータ１０の回転時に、ロータコア２０の外周面に過大な遠心応力が発生することを回避できる。さらに、隙間部Ｇによって、外径側永久磁石８１０及びロータコア２０の変形を許容できるので、外径側永久磁石８１０及びロータコア２０の冷熱応力を低減できる。 As a result, the outer diameter side permanent magnet 810 and the outer diameter side magnet insertion hole 410 do not come into contact with each other at the circumferential central portion 810C of the outer diameter side permanent magnet 810, so that the outer peripheral surface of the rotor core 20 is excessively large when the rotor 10 rotates. Generation of centrifugal stress can be avoided. Furthermore, the deformation of the outer diameter side permanent magnet 810 and the rotor core 20 can be allowed by the gap G, so that the thermal stress of the outer diameter side permanent magnet 810 and the rotor core 20 can be reduced.
　また、外径側永久磁石８１０の外径側湾曲面８１２の円弧半径ｒ１０は、外径側磁石挿入孔４１０の外径側壁面４１２の円弧半径ｒ４２よりも小さくなっているので、外径側永久磁石８１０の周方向中央部８１０Ｃにおいて、外径側永久磁石８１０の外径側湾曲面８１２と、外径側磁石挿入孔４１０の外径側壁面４１２との間に、確実に隙間部Ｇを確保できる。 Further, since the arc radius r10 of the outer diameter side curved surface 812 of the outer diameter side permanent magnet 810 is smaller than the arc radius r42 of the outer diameter side wall surface 412 of the outer diameter side magnet insertion hole 410, the outer diameter side permanent magnet At the circumferential center 810C of the magnet 810, a gap G is securely secured between the outer curved surface 812 of the outer permanent magnet 810 and the outer sidewall 412 of the outer magnet insertion hole 410. it can.
　なお、外径側永久磁石８１０の内径側平坦部８１５、外径側左端平坦部８１６及び外径側右端平坦部８１７は、例えば円弧磁石を切削加工する等、任意の方法によって形成することができる。平坦な面は、円弧形状等の湾曲した面よりも高精度で加工できる。このため、内径側平坦部８１５、外径側左端平坦部８１６及び外径側右端平坦部８１７を有する外径側永久磁石８１０は、通常の円弧磁石よりも寸法精度が向上する。 In addition, the inner diameter side flat portion 815, the outer diameter side left end flat portion 816, and the outer diameter side right end flat portion 817 of the outer diameter side permanent magnet 810 can be formed by any method, for example, by cutting a circular arc magnet. . A flat surface can be processed with higher precision than a curved surface such as an arc shape. For this reason, the outer diameter side permanent magnet 810 having the inner diameter side flat portion 815, the outer diameter side left end flat portion 816, and the outer diameter side right end flat portion 817 has higher dimensional accuracy than a normal arc magnet.
　これにより、外径側磁石挿入孔４１０を小さくすることができ、回転電機の出力性能の低下を抑制できる。 This allows the outer diameter side magnet insertion hole 410 to be reduced in size, thereby suppressing a decrease in output performance of the rotating electric machine.
　ここで、外径側永久磁石８１０、第１内径側永久磁石８２１、及び第２内径側永久磁石８２２は、例えば、熱間加工プロセスを用いた成形により形成されたリング状磁石を径方向に切断した円弧磁石を用いることができる。 Here, the outer diameter side permanent magnet 810, the first inner diameter side permanent magnet 821, and the second inner diameter side permanent magnet 822 are formed by, for example, cutting a ring-shaped magnet formed by molding using a hot working process in the radial direction. Arc magnets can be used.
　一般に、熱間押出し成形等の熱間加工プロセスを用いた成形によりリング状磁石を形成する場合、熱間押出し成形することにより、ランダムに配向していたリング状磁石素材の結晶群に径方向の圧縮応力が作用し、リング状磁石素材の結晶群は、圧縮応力方向と同方向に配向する。その結果、径方向に配向した異方性リング状磁石が得られる。 In general, when forming a ring-shaped magnet by molding using a hot working process such as hot extrusion, by hot extrusion, the crystal group of the ring-shaped magnet material that has been randomly oriented is radially oriented. The compressive stress acts, and the crystal group of the ring-shaped magnet material is oriented in the same direction as the compressive stress direction. As a result, an anisotropic ring-shaped magnet oriented in the radial direction is obtained.
　したがって、高性能な磁化特性を持ったリング状磁石を得るためには、リング状磁石素材の結晶群に作用する応力が全域で均一となることが望ましい。しかし、リング状磁石素材のリング半径が小さく、リング状磁石素材の肉厚が大きい場合は、リング状磁石素材の結晶群に作用する応力が不均一となり、リング状磁石の配向度が低下してしまう。また、リング状磁石素材の肉厚が不均一の場合も、リング状磁石素材の結晶群に作用する応力が不均一となり、リング状磁石の配向度が低下してしまう。よって、リング状磁石素材の結晶群に作用する応力が全域で均一となるためには、（リング状磁石素材の肉厚）／（リング状磁石素材のリング半径）の値が、所定範囲内にある必要があり、円弧磁石の磁石量を増やすに際し、高性能な磁化特性を持った円弧磁石を複数層に配置するには、板厚に応じて円弧磁石の円弧半径も大きくする必要がある。 Therefore, in order to obtain a ring-shaped magnet having high-performance magnetization characteristics, it is desirable that the stress acting on the crystal group of the ring-shaped magnet material be uniform over the entire region. However, when the ring radius of the ring-shaped magnet material is small and the wall thickness of the ring-shaped magnet material is large, the stress acting on the crystal group of the ring-shaped magnet material becomes non-uniform, and the degree of orientation of the ring-shaped magnet decreases. I will. Also, when the thickness of the ring-shaped magnet material is not uniform, the stress acting on the crystals of the ring-shaped magnet material becomes uneven, and the degree of orientation of the ring-shaped magnet is reduced. Therefore, in order for the stress acting on the crystal group of the ring-shaped magnet material to be uniform over the entire region, the value of (thickness of the ring-shaped magnet material) / (ring radius of the ring-shaped magnet material) must be within a predetermined range. In order to increase the number of arc magnets in order to arrange arc magnets having high-performance magnetization characteristics in a plurality of layers, it is necessary to increase the arc radius of the arc magnet in accordance with the plate thickness.
　第１内径側永久磁石８２１の板厚ｄ２１及び第２内径側永久磁石８２２の板厚ｄ２２は、外径側永久磁石８１０の板厚ｄ１０よりも大きくなっている。これにより、第１内径側永久磁石８２１及び第２内径側永久磁石８２２の磁石量を増やすことができ、回転電機のマグネットトルクを大きくできるので、回転電機の出力性能を向上できる。 The plate thickness d21 of the first inner permanent magnet 821 and the plate thickness d22 of the second inner permanent magnet 822 are larger than the plate thickness d10 of the outer permanent magnet 810. Thereby, the magnet amount of the first inner diameter side permanent magnet 821 and the second inner diameter side permanent magnet 822 can be increased, and the magnet torque of the rotating electric machine can be increased, so that the output performance of the rotating electric machine can be improved.
　また、第１内径側永久磁石８２１の板厚ｄ２１及び第２内径側永久磁石８２２の板厚ｄ２２を大きくした分、第１内径側永久磁石８２１の円弧半径ｒ２１及び第２内径側永久磁石８２２の円弧半径ｒ２２は、外径側永久磁石８１０の円弧半径ｒ１０よりも大きくなっている。これにより、高性能な磁化特性を持つ外径側永久磁石８１０、第１内径側永久磁石８２１、及び第２内径側永久磁石８２２を用いることができるので、回転電機の出力性能を向上できる。なお、外径側永久磁石８１０の円弧半径ｒ１０、第１内径側永久磁石８２１の円弧半径ｒ２１及び第２内径側永久磁石８２２の円弧半径ｒ２２は、円弧中心から永久磁石の内周側の円弧面までの長さとする。 In addition, as the plate thickness d21 of the first inner permanent magnet 821 and the plate thickness d22 of the second inner permanent magnet 822 are increased, the arc radius r21 of the first inner permanent magnet 821 and the second inner permanent magnet 822 are increased. The arc radius r22 is larger than the arc radius r10 of the outer diameter side permanent magnet 810. Thus, the outer diameter side permanent magnet 810, the first inner diameter side permanent magnet 821, and the second inner diameter side permanent magnet 822 having high performance magnetization characteristics can be used, so that the output performance of the rotating electric machine can be improved. Note that the arc radius r10 of the outer diameter side permanent magnet 810, the arc radius r21 of the first inner diameter side permanent magnet 821, and the arc radius r22 of the second inner diameter side permanent magnet 822 are the arc surfaces from the center of the arc to the inner circumference of the permanent magnet. Length.
　ここで、外径側永久磁石８１０の円弧半径ｒ１０と、外径側永久磁石８１０の板厚ｄ１０との比であるｄ１０／ｒ１０と、第１内径側永久磁石８２１の円弧半径ｒ２１と、第１内径側永久磁石８２１の板厚ｄ２１との比であるｄ２１／ｒ２１と、第２内径側永久磁石８２２の円弧半径ｒ２２と、第２内径側永久磁石８２２の板厚ｄ２２との比であるｄ２２／ｒ２２とは、所定範囲で略同一の値であることが好ましい。より好ましくは、第１内径側永久磁石８２１の円弧半径ｒ２１と第２内径側永久磁石８２２の円弧半径ｒ２２とが同一、かつ、第１内径側永久磁石８２１の板厚ｄ２１と第２内径側永久磁石８２２の板厚ｄ２２が同一であり、第１内径側永久磁石８２１と第２内径側永久磁石８２２とが同一形状となっている。 Here, d10 / r10, which is the ratio of the arc radius r10 of the outer diameter side permanent magnet 810 to the plate thickness d10 of the outer diameter side permanent magnet 810, the arc radius r21 of the first inner diameter side permanent magnet 821, and the first D21 / r21, which is the ratio of the plate thickness d21 of the inner diameter side permanent magnet 821, the arc radius r22 of the second inner side permanent magnet 822, and d22 / r, which is the ratio of the plate thickness d22 of the second inner side permanent magnet 822. r22 is preferably substantially the same value within a predetermined range. More preferably, the arc radius r21 of the first inner permanent magnet 821 and the arc radius r22 of the second inner permanent magnet 822 are the same, and the plate thickness d21 of the first inner permanent magnet 821 and the second inner permanent magnet 821 are equal. The plate thickness d22 of the magnets 822 is the same, and the first inner permanent magnet 821 and the second inner permanent magnet 822 have the same shape.
［第２実施形態］
　続いて、本発明の第２実施形態のロータ１０について図３を参照しながら説明する。なお、以下の説明において、第１実施形態のロータ１０と同一の構成要素については同一の符号を付して説明を省略又は簡略化し、第１実施形態のロータ１０との相違点について詳細に説明する。第１実施形態の外径側永久磁石８１０の内径側平坦部８１５は、外径側永久磁石８１０の内径側湾曲面８１１の周方向中央部８１０Ｃを切り欠いた形状となっている。 [Second embodiment]
Next, a rotor 10 according to a second embodiment of the present invention will be described with reference to FIG. In the following description, the same components as those of the rotor 10 of the first embodiment will be denoted by the same reference numerals, and the description thereof will be omitted or simplified. Differences from the rotor 10 of the first embodiment will be described in detail. I do. The inner diameter side flat portion 815 of the outer diameter side permanent magnet 810 of the first embodiment has a shape in which a circumferential central portion 810C of the inner diameter side curved surface 811 of the outer diameter side permanent magnet 810 is cut out.
　一方、図３に示すように、本実施形態の外径側永久磁石８１０の内径側平坦部８１５は、外径側永久磁石８１０の内径側湾曲面８１１から径方向内側に突出するように形成されている。 On the other hand, as shown in FIG. 3, the inner diameter side flat portion 815 of the outer diameter side permanent magnet 810 of this embodiment is formed so as to protrude radially inward from the inner diameter side curved surface 811 of the outer diameter side permanent magnet 810. ing.
　これにより、外径側永久磁石８１０の磁石量を減らすことなく内径側平坦部８１５を形成することができるので、回転電機の出力性能が低下することなく、内径側平坦部８１５を形成することができる。 Thereby, the inner diameter side flat portion 815 can be formed without reducing the magnet amount of the outer diameter side permanent magnet 810, so that the inner diameter side flat portion 815 can be formed without lowering the output performance of the rotating electric machine. it can.
　なお、前述した実施形態は、適宜、変形、改良、等が可能である。 The above-described embodiment can be appropriately modified, improved, and the like.
　例えば、第１実施形態及び第２実施形態では、外径側永久磁石８１０の内径側湾曲面８１１及び外径側湾曲面８１２は、同じ円弧中心Ｃ１０を有する径方向内側に向かって凸状の円弧形状としたが、例えば、外径側永久磁石８１０は、内径側湾曲面８１１の円弧半径が、外径側湾曲面８１２の円弧半径よりも大きくなっており、外径側永久磁石８１０は、周方向中央部８１０Ｃから周方向両端部８１０Ｌ、８１０Ｒに向かって板厚が減少する、略三日月形状としてもよい。さらに、外径側永久磁石８１０の内径側湾曲面８１１及び外径側湾曲面８１２は、円弧形状に限らず、径方向内側に向かって凸状に湾曲した任意の形状を有していてもよい。 For example, in the first embodiment and the second embodiment, the inner radius side curved surface 811 and the outer radius side curved surface 812 of the outer radius side permanent magnet 810 are arcs having the same arc center C10 and projecting radially inward. For example, in the outer diameter side permanent magnet 810, the arc radius of the inner diameter side curved surface 811 is larger than the arc radius of the outer diameter side curved surface 812. It may be a substantially crescent shape in which the plate thickness decreases from the central portion 810C in the direction toward both ends 810L and 810R in the circumferential direction. Further, the inner diameter side curved surface 811 and the outer diameter side curved surface 812 of the outer diameter side permanent magnet 810 are not limited to the arc shape, and may have any shape curved convexly inward in the radial direction. .
　また、第１実施形態及び第２実施形態では、外径側永久磁石８１０について説明したが、第１内径側永久磁石８２１及び第２内径側永久磁石８２２についても、外径側永久磁石８１０と同様の構成を有していてもよい。さらに、第１実施形態及び第２実施形態において、内径側磁石部３２０の第１内径側永久磁石８２１及び第２内径側永久磁石８２２は、省略することができる。すなわち、磁石部３００は、外径側磁石部３１０の外径側永久磁石８１０のみからなっていてもよい。 In the first embodiment and the second embodiment, the outer diameter side permanent magnet 810 has been described. However, the first inner diameter side permanent magnet 821 and the second inner diameter side permanent magnet 822 are similar to the outer diameter side permanent magnet 810. May be provided. Furthermore, in the first embodiment and the second embodiment, the first inner permanent magnet 821 and the second inner permanent magnet 822 of the inner magnet portion 320 can be omitted. That is, the magnet unit 300 may be composed of only the outer permanent magnet 810 of the outer magnet unit 310.
　また、本明細書には少なくとも以下の事項が記載されている。なお、括弧内には、上記した実施形態において対応する構成要素等を示しているが、これに限定されるものではない。 少 な く と も In addition, at least the following matters are described in this specification. In addition, although the corresponding components in the above-described embodiment are shown in parentheses, the present invention is not limited to this.
　（１）　周方向に沿って形成された複数の磁石挿入孔（外径側磁石挿入孔４１０）を有する略円環形状のロータコア（ロータコア２０）と、
　前記複数の磁石挿入孔に挿入された複数の永久磁石（外径側永久磁石８１０）と、を備え、
　前記永久磁石は、内径面に径方向内側に凸状に湾曲した内径側湾曲面（内径側湾曲面８１１）と、外径面に径方向内側に凸状に湾曲した外径側湾曲面（外径側湾曲面８１２）と、を有し、
　前記磁石挿入孔は、前記永久磁石の前記内径側湾曲面と対向する内径側壁面（内径側壁面４１１）と、前記永久磁石の前記外径側湾曲面と対向する外径側壁面（外径側壁面４１２）と、を有する、回転電機のロータ（ロータ１０）であって、
　前記永久磁石は、前記内径側湾曲面の周方向中央部（周方向中央部８１０Ｃ）に内径側平坦部（内径側平坦部８１５）を有し、
　前記磁石挿入孔は、前記内径側壁面に前記永久磁石の前記内径側平坦部と対向する内径側平坦壁面（内径側平坦壁面４１５）を有し、
　前記永久磁石の前記内径側平坦部と前記磁石挿入孔の前記内径側平坦壁面とが、直接又は間接的に当接した状態で、前記永久磁石の周方向中央部（周方向中央部８１０Ｃ）には、前記永久磁石の前記外径側湾曲面と前記磁石挿入孔の前記外径側壁面との間に隙間部（隙間部Ｇ）が設けられている、回転電機のロータ。 (1) a substantially annular rotor core (rotor core 20) having a plurality of magnet insertion holes (outer diameter side magnet insertion holes 410) formed along the circumferential direction;
A plurality of permanent magnets (outside diameter permanent magnets 810) inserted into the plurality of magnet insertion holes,
The permanent magnet has an inner diameter side curved surface (inner diameter side curved surface 811) curved radially inwardly convex on the inner diameter surface, and an outer diameter side curved surface (outside diameter curved surface) curved radially inwardly convexly on the outer diameter surface. And a radially curved surface 812).
The magnet insertion hole has an inner diameter side wall surface (inner diameter side surface 411) facing the inner diameter side curved surface of the permanent magnet, and an outer diameter side wall surface (outside diameter side) facing the outer diameter side curved surface of the permanent magnet. A wall surface 412) of the rotating electric machine (rotor 10),
The permanent magnet has an inner diameter side flat portion (inner diameter side flat portion 815) at a circumferential center portion (a circumferential center portion 810C) of the inner diameter side curved surface,
The magnet insertion hole has an inner diameter side flat wall surface (inner diameter side flat wall surface 415) facing the inner diameter side flat portion of the permanent magnet on the inner diameter side wall surface,
In a state where the inner diameter side flat portion of the permanent magnet and the inner diameter side flat wall surface of the magnet insertion hole are in direct or indirect contact with each other, the permanent magnet is positioned at a circumferential central portion (a circumferential central portion 810C). A rotor for a rotating electric machine, wherein a gap (gap G) is provided between the outer diameter side curved surface of the permanent magnet and the outer diameter side wall surface of the magnet insertion hole.
　（１）によれば、永久磁石の周方向中央部には、永久磁石の外径側湾曲面と、磁石挿入孔の外径側壁面との間に隙間部が設けられているので、永久磁石の周方向中央部において、永久磁石と磁石挿入孔は接触しない。これにより、ロータの回転時に、ロータコアの外周面に過大な遠心応力が発生することを回避できる。さらに、隙間部によって、永久磁石及びロータコアの変形を許容できるので、永久磁石及びロータコアの冷熱応力を低減できる。
　また、永久磁石の内径面は、周方向中央部に設けられた内径側平坦面を有し、磁石挿入孔の内径側壁面は、磁石挿入孔の周方向中央部に設けられた内径側平坦壁面を有する。平坦な面は高精度で加工できるため、永久磁石及び磁石挿入孔の寸法精度が向上する。これにより、磁石挿入孔を小さくすることができ、回転電機の出力性能の低下を抑制できる。 According to (1), a gap is provided between the outer diameter side curved surface of the permanent magnet and the outer diameter side wall surface of the magnet insertion hole at the circumferential center of the permanent magnet. At the center in the circumferential direction, the permanent magnet does not contact the magnet insertion hole. Thereby, it is possible to avoid occurrence of excessive centrifugal stress on the outer peripheral surface of the rotor core when the rotor rotates. Further, since the deformation of the permanent magnet and the rotor core can be allowed by the gap, the thermal stress of the permanent magnet and the rotor core can be reduced.
Further, the inner diameter surface of the permanent magnet has an inner diameter side flat surface provided at a circumferential center portion, and the inner diameter side wall surface of the magnet insertion hole is provided at an inner diameter flat surface provided at a circumferential center portion of the magnet insertion hole. Having. Since the flat surface can be processed with high accuracy, the dimensional accuracy of the permanent magnet and the magnet insertion hole is improved. As a result, the magnet insertion hole can be made smaller, and a decrease in output performance of the rotating electric machine can be suppressed.
　（２）　（１）に記載の回転電機のロータであって、
　前記ロータコアの正面から見て、
　前記永久磁石の前記内径側平坦部の長さ（長さＬ８５）は、前記磁石挿入孔の前記内径側平坦壁面の長さ（長さＬ４５）よりも短い、回転電機のロータ。 (2) The rotor of the rotary electric machine according to (1),
Seen from the front of the rotor core,
The length of the inner diameter side flat portion (length L85) of the permanent magnet is shorter than the length of the inner diameter side flat wall surface (length L45) of the magnet insertion hole.
　（２）によれば、永久磁石の内径側平坦部の長さは、磁石挿入孔の内径側平坦壁面の長さよりも短くなっているので、永久磁石を外径側磁石挿入孔に挿入するのが容易となり、生産性が向上する。
　また、永久磁石の内径側平坦部の長さは、磁石挿入孔の内径側平坦壁面の長さよりも短くなっているので、永久磁石の内径側平坦部は、確実に直接的又は間接的に磁石挿入孔の内径側平坦壁面と当接する。これにより、永久磁石の内径側平坦部と磁石挿入孔の内径側平坦壁面との当接面が安定するので、永久磁石がロータコアに固定される位置のバラつきを低減できる。 According to (2), the length of the inner diameter side flat portion of the permanent magnet is shorter than the length of the inner diameter side flat wall surface of the magnet insertion hole, so that the permanent magnet is inserted into the outer diameter side magnet insertion hole. And the productivity is improved.
In addition, since the length of the inner diameter side flat portion of the permanent magnet is shorter than the length of the inner diameter side flat wall surface of the magnet insertion hole, the inner diameter side flat portion of the permanent magnet is reliably directly or indirectly magnetized. It comes into contact with the flat wall surface on the inner diameter side of the insertion hole. This stabilizes the contact surface between the inner-diameter flat portion of the permanent magnet and the inner-diameter flat wall surface of the magnet insertion hole, thereby reducing the variation in the position where the permanent magnet is fixed to the rotor core.
　（３）　（１）または（２）に記載の回転電機のロータであって、
　前記永久磁石の前記内径側平坦部と、前記磁石挿入孔の前記内径側平坦壁面との間には、発泡シート（発泡シート９０）が設けられている、回転電機のロータ。 (3) The rotor of the rotary electric machine according to (1) or (2),
A rotor for a rotating electric machine, wherein a foamed sheet (foamed sheet 90) is provided between the inner diameter side flat portion of the permanent magnet and the inner diameter side flat wall surface of the magnet insertion hole.
　（３）によれば、発泡シートは、永久磁石の内径側平坦部と、磁石挿入孔の内径側平坦壁面との間に設けられるので、ロータの製造の際、発泡シートの位置決めが容易であり、生産性が向上する。さらに、平坦な面に配置された発泡シートが発泡するので、永久磁石が磁石挿入孔の外径側壁面と当接する位置のバラつきを低減できる。これにより、永久磁石がロータコアに固定される位置のバラつきを低減できる。 According to (3), since the foamed sheet is provided between the inner diameter side flat portion of the permanent magnet and the inner diameter side flat wall surface of the magnet insertion hole, the positioning of the foamed sheet is easy in manufacturing the rotor. , And productivity is improved. Furthermore, since the foam sheet arranged on the flat surface foams, it is possible to reduce variation in the position where the permanent magnet abuts on the outer diameter side wall surface of the magnet insertion hole. Thus, it is possible to reduce variation in the position where the permanent magnet is fixed to the rotor core.
　（４）　（１）～（３）のいずれかに記載の回転電機のロータであって、
　前記永久磁石の前記外径側湾曲面は、径方向内側に向かって凸状の円弧形状を有し、
　前記磁石挿入孔の前記外径側壁面は、径方向内側に向かって凸状の円弧形状を有し、
　前記永久磁石の前記外径側湾曲面の円弧半径（円弧半径ｒ１０）は、前記磁石挿入孔の前記外径側壁面の円弧半径（円弧半径ｒ４２）よりも小さい、回転電機のロータ。 (4) The rotor of the rotary electric machine according to any one of (1) to (3),
The outer diameter side curved surface of the permanent magnet has a circular arc shape convex toward the radially inward side,
The outer diameter side wall surface of the magnet insertion hole has an arc shape convex toward the radially inward side,
The rotor of the rotating electric machine, wherein an arc radius (arc radius r10) of the outer diameter side curved surface of the permanent magnet is smaller than an arc radius (arc radius r42) of the outer diameter side wall surface of the magnet insertion hole.
　（４）によれば、永久磁石の外径側湾曲面の円弧半径は、磁石挿入孔の外径側壁面の円弧半径よりも小さくなっているので、永久磁石の周方向中央部において、永久磁石の外径側湾曲面と、磁石挿入孔の外径側壁面との間に、確実に隙間部を確保できる。 According to (4), the radius of the arc of the outer diameter side curved surface of the permanent magnet is smaller than the radius of the arc of the outer diameter side wall surface of the magnet insertion hole. Between the outer diameter side curved surface and the outer diameter side wall surface of the magnet insertion hole.
　（５）　（１）～（４）のいずれかに記載の回転電機のロータであって、
　前記永久磁石の前記外径側湾曲面の周方向両端部（周方向両端部８１０Ｌ、８１０Ｒ）には、外径側平坦部（外径側左端平坦部８１６、外径側右端平坦部８１７）が設けられており、
　前記磁石挿入孔の前記外径側壁面の周方向両端部には、外径側平坦壁面（外径側左端平坦壁面４１６、外径側右端平坦壁面４１７）が設けられている、回転電機のロータ。 (5) The rotor of the rotary electric machine according to any one of (1) to (4),
At both ends in the circumferential direction (both ends 810L and 810R in the circumferential direction) of the outer diameter side curved surface of the permanent magnet, outer diameter side flat portions (outer diameter left end flat portion 816, outer diameter right right end flat portion 817) are provided. Is provided,
A rotor of a rotating electric machine, wherein outer peripheral side flat wall surfaces (outer radial side left end flat wall surface 416, outer radial side right end flat wall surface 417) are provided at both circumferential end portions of the outer diameter side wall surface of the magnet insertion hole. .
　（５）によれば、永久磁石の外径側湾曲面の周方向両端部には、外径側平坦面が設けられており、磁石挿入孔の外径側壁面の周方向両端部には、外径側平坦壁面が設けられているので、永久磁石が外径側に移動すると、永久磁石は、外径側平坦部が磁石挿入孔の外径側平坦壁面と当接する。これにより、永久磁石が磁石挿入孔と当接する位置のバラつきを低減でき、永久磁石がロータコアに固定される位置のバラつきを低減できる。 According to (5), outer diameter side flat surfaces are provided at both ends in the circumferential direction of the outer diameter side curved surface of the permanent magnet, and at both ends in the circumferential direction of the outer diameter side wall surface of the magnet insertion hole, Since the outer diameter side flat wall surface is provided, when the permanent magnet moves to the outer diameter side, the outer diameter side flat portion of the permanent magnet comes into contact with the outer diameter side flat wall surface of the magnet insertion hole. Thereby, the variation in the position where the permanent magnet contacts the magnet insertion hole can be reduced, and the variation in the position where the permanent magnet is fixed to the rotor core can be reduced.
　（６）　（１）～（５）のいずれかに記載の回転電機のロータであって、
　前記永久磁石の前記内径側平坦部は、前記永久磁石の前記内径側湾曲面から径方向内側に突出するように形成されている、回転電機のロータ。 (6) The rotor of the rotary electric machine according to any one of (1) to (5),
The rotor of the rotating electric machine, wherein the inner diameter side flat portion of the permanent magnet is formed to protrude radially inward from the inner diameter side curved surface of the permanent magnet.
　（６）によれば、永久磁石の内径側平坦部は、永久磁石の内径側湾曲面から径方向内側に突出するように形成されているので、永久磁石の磁石量を減らすことなく内径側平坦部を形成することができる。 According to (6), the flat portion on the inner diameter side of the permanent magnet is formed so as to protrude radially inward from the curved surface on the inner diameter side of the permanent magnet. A part can be formed.
　なお、本出願は、２０１８年９月２８日出願の日本特許出願（特願２０１８－１８５５２２）に基づくものであり、その内容はここに参照として取り込まれる。 This application is based on a Japanese patent application filed on Sep. 28, 2018 (Japanese Patent Application No. 2018-185522), the contents of which are incorporated herein by reference.
１０　ロータ
２０　ロータコア
４１０　外径側磁石挿入孔（磁石挿入孔）
４１１　内径側壁面
４１２　外径側壁面
４１５　内径側平坦壁面
４１６　外径側左端平坦壁面（外径側平坦壁面）
４１７　外径側右端平坦壁面（外径側平坦壁面）
８１０　外径側永久磁石（永久磁石）
８１０Ｃ　周方向中央部
８１０Ｌ　周方向左端部（周方向両端部）
８１０Ｒ　周方向右端部（周方向両端部）
８１１　内径側湾曲面
８１２　外径側湾曲面
８１５　内径側平坦部
８１６　外径側左端平坦部（外径側平坦部）
８１７　外径側右端平坦部（外径側平坦部）
９０　発泡シート
Ｇ　隙間部
Ｌ４５、Ｌ８５　長さ
ｒ１０、ｒ４２　円弧半径  10 Rotor 20 Rotor core 410 Outer diameter side magnet insertion hole (magnet insertion hole)
411 inner diameter side wall surface 412 outer diameter side wall surface 415 inner diameter side flat wall surface 416 outer diameter side left end flat wall surface (outer diameter side flat wall surface)
417 Outer diameter side right end flat wall surface (outer diameter side flat wall surface)
810 Outer diameter side permanent magnet (permanent magnet)
810C Circumferential center part 810L Circumferential left end (both circumferential ends)
810R Circumferential right end (circumferential ends)
811 inner diameter side curved surface 812 outer diameter side curved surface 815 inner diameter side flat portion 816 outer diameter side left end flat portion (outside diameter flat portion)
817 Outer diameter side right end flat part (outer diameter side flat part)
90 Foam sheet G Gap L45, L85 Length r10, r42 Arc radius

Claims (6)

  1. 　周方向に沿って形成された複数の磁石挿入孔を有する略円環形状のロータコアと、
    　前記複数の磁石挿入孔に挿入された複数の永久磁石と、を備え、
    　前記永久磁石は、内径面に径方向内側に凸状に湾曲した内径側湾曲面と、外径面に径方向内側に凸状に湾曲した外径側湾曲面と、を有し、
    　前記磁石挿入孔は、前記永久磁石の前記内径側湾曲面と対向する内径側壁面と、前記永久磁石の前記外径側湾曲面と対向する外径側壁面と、を有する、回転電機のロータであって、
    　前記永久磁石は、前記内径側湾曲面の周方向中央部に内径側平坦部を有し、
    　前記磁石挿入孔は、前記内径側壁面に前記永久磁石の前記内径側平坦部と対向する内径側平坦壁面を有し、
    　前記永久磁石の前記内径側平坦部と前記磁石挿入孔の前記内径側平坦壁面とが、直接又は間接的に当接した状態で、前記永久磁石の周方向中央部には、前記永久磁石の前記外径側湾曲面と前記磁石挿入孔の前記外径側壁面との間に隙間部が設けられている、回転電機のロータ。     A substantially annular rotor core having a plurality of magnet insertion holes formed along a circumferential direction,
    A plurality of permanent magnets inserted into the plurality of magnet insertion holes,
    The permanent magnet has an inner diameter side curved surface curved in a radially inward convex shape on the inner diameter surface, and an outer diameter side curved surface curved in a radially inward convex shape on the outer diameter surface,
    The magnet insertion hole has an inner diameter side wall surface facing the inner diameter side curved surface of the permanent magnet, and an outer diameter side wall surface facing the outer diameter side curved surface of the permanent magnet. So,
    The permanent magnet has an inner diameter side flat portion at a circumferential center of the inner diameter side curved surface,
    The magnet insertion hole has an inner diameter side flat wall surface facing the inner diameter side flat portion of the permanent magnet on the inner diameter side wall surface,
    In a state where the inner diameter side flat portion of the permanent magnet and the inner diameter side flat wall surface of the magnet insertion hole are in direct or indirect contact with each other, at the circumferential center of the permanent magnet, A rotor for a rotating electric machine, wherein a gap is provided between an outer diameter side curved surface and the outer diameter side wall surface of the magnet insertion hole.
  2. 　請求項１に記載の回転電機のロータであって、
    　前記ロータコアの正面から見て、
    　前記永久磁石の前記内径側平坦部の長さは、前記磁石挿入孔の前記内径側平坦壁面の長さよりも短い、回転電機のロータ。     It is a rotor of the rotary electric machine according to claim 1, wherein
    Seen from the front of the rotor core,
    The rotor of the rotating electric machine, wherein a length of the inner diameter side flat portion of the permanent magnet is shorter than a length of the inner diameter side flat wall surface of the magnet insertion hole.
  3. 　請求項１または２に記載の回転電機のロータであって、
    　前記永久磁石の前記内径側平坦部と、前記磁石挿入孔の前記内径側平坦壁面との間には、発泡シートが設けられている、回転電機のロータ。     It is a rotor of the rotating electric machine according to claim 1 or 2,
    A rotor for a rotating electric machine, wherein a foam sheet is provided between the inner diameter side flat portion of the permanent magnet and the inner diameter side flat wall surface of the magnet insertion hole.
  4. 　請求項１～３のいずれか一項に記載の回転電機のロータであって、
    　前記永久磁石の前記外径側湾曲面は、径方向内側に向かって凸状の円弧形状を有し、
    　前記磁石挿入孔の前記外径側壁面は、径方向内側に向かって凸状の円弧形状を有し、
    　前記永久磁石の前記外径側湾曲面の円弧半径は、前記磁石挿入孔の前記外径側壁面の円弧半径よりも小さい、回転電機のロータ。     The rotating electric machine rotor according to any one of claims 1 to 3, wherein
    The outer diameter side curved surface of the permanent magnet has a circular arc shape convex toward the radially inward side,
    The outer diameter side wall surface of the magnet insertion hole has an arc shape convex toward the radially inward side,
    The rotor of the rotating electric machine, wherein an arc radius of the outer diameter side curved surface of the permanent magnet is smaller than an arc radius of the outer diameter side wall surface of the magnet insertion hole.
  5. 　請求項１～４のいずれか一項に記載の回転電機のロータであって、
    　前記永久磁石の前記外径側湾曲面の周方向両端部には、外径側平坦部が設けられており、
    　前記磁石挿入孔の前記外径側壁面の周方向両端部には、外径側平坦壁面が設けられている、回転電機のロータ。     The rotor of the rotating electric machine according to any one of claims 1 to 4, wherein
    At both ends in the circumferential direction of the outer diameter side curved surface of the permanent magnet, an outer diameter side flat portion is provided,
    A rotor for a rotating electric machine, wherein outer peripheral side flat wall surfaces are provided at both circumferential ends of the outer peripheral side wall surface of the magnet insertion hole.
  6. 　請求項１～５のいずれか一項に記載の回転電機のロータであって、
    　前記永久磁石の前記内径側平坦部は、前記永久磁石の前記内径側湾曲面から径方向内側に突出するように形成されている、回転電機のロータ。      The rotor of the rotating electric machine according to any one of claims 1 to 5, wherein
    The rotor of the rotating electric machine, wherein the inner diameter side flat portion of the permanent magnet is formed to protrude radially inward from the inner diameter side curved surface of the permanent magnet.
PCT/JP2019/037983 2018-09-28 2019-09-26 Rotor of electric rotary machine WO2020067349A1 (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10295051A (en) * 1997-02-21 1998-11-04 Aisin Aw Co Ltd Permanent magnet type synchronous motor
JP2003088071A (en) * 2001-09-06 2003-03-20 Toshiba Corp Reluctance type electric rotating machine
JP2007174872A (en) * 2005-12-26 2007-07-05 Nitto Shinko Kk Heated foamed sheet for bonding motor magnetic member
JP2016105696A (en) * 2016-03-07 2016-06-09 日立アプライアンス株式会社 Permanent magnet synchronous machine
WO2016185829A1 (en) * 2015-05-19 2016-11-24 三菱電機株式会社 Rotor, rotating electrical machine, and method for producing rotor
WO2017119102A1 (en) * 2016-01-07 2017-07-13 三菱電機株式会社 Permanent magnet embedded motor, compressor, and refrigeration and air conditioning device
JP2018067978A (en) * 2016-10-17 2018-04-26 日立オートモティブシステムズ株式会社 Rotary electric machine and manufacturing method of the same

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10295051A (en) * 1997-02-21 1998-11-04 Aisin Aw Co Ltd Permanent magnet type synchronous motor
JP2003088071A (en) * 2001-09-06 2003-03-20 Toshiba Corp Reluctance type electric rotating machine
JP2007174872A (en) * 2005-12-26 2007-07-05 Nitto Shinko Kk Heated foamed sheet for bonding motor magnetic member
WO2016185829A1 (en) * 2015-05-19 2016-11-24 三菱電機株式会社 Rotor, rotating electrical machine, and method for producing rotor
WO2017119102A1 (en) * 2016-01-07 2017-07-13 三菱電機株式会社 Permanent magnet embedded motor, compressor, and refrigeration and air conditioning device
JP2016105696A (en) * 2016-03-07 2016-06-09 日立アプライアンス株式会社 Permanent magnet synchronous machine
JP2018067978A (en) * 2016-10-17 2018-04-26 日立オートモティブシステムズ株式会社 Rotary electric machine and manufacturing method of the same

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