WO2020067347A1

WO2020067347A1 - Rotary electric machine rotor

Info

Publication number: WO2020067347A1
Application number: PCT/JP2019/037981
Authority: WO
Inventors: 芳永久保田; 慎吾相馬; 達也大図
Original assignee: 本田技研工業株式会社
Priority date: 2018-09-28
Filing date: 2019-09-26
Publication date: 2020-04-02

Abstract

A rotary electric machine rotor (10) that comprises a rotor core (20) and a magnetic pole part (30). The magnetic pole part (30) has a magnet part (300) that has at least two radial-direction layers and includes: an outer-diameter-side magnet part (310) that is configured from an outer-diameter-side arc magnet (810); and an inner-diameter-side magnet part (320) that is configured from a pair of inner-diameter-side arc magnets (821, 822). The arc centers of an inner circumferential surface and an outer circumferential surface of each arc magnet are the same. The plate thickness of the arc magnets of the inner-diameter-side magnet part (320) is greater than the plate thickness of the arc magnet of the outer-diameter-side magnet part (310), and the arc radius of the arc magnets of the inner-diameter-side magnet part (320) is greater than the arc radius of the arc magnet of the outer-diameter-side magnet part (310). The distances (D11, D12) between the inner-diameter-side arc magnets (821, 822) and the outer-diameter-side arc magnet (810) increase from q-axes toward a d-axis.

Description

Rotating electric machine rotor

The present invention relates to a rotor of a rotating electric machine mounted on an electric vehicle or the like, and particularly to a rotor of a rotating electric machine including a plurality of arc magnets.

Conventionally, as a rotor used in a rotating electric machine, a rotor in which a plurality of permanent magnets are arranged at predetermined intervals in a circumferential direction inside a rotor core is known. Among the rotors of such a rotating electrical machine, there is a rotor having an arc magnet located on the outer diameter side of the rotor and an arc magnet located on the inner diameter side of the rotor having magnetic pole portions arranged in two layers at intervals. . For example, in Patent Literature 1, an arc magnet positioned on the outer diameter side of the rotor and an arc magnet positioned on the inner diameter side of the rotor have substantially the same plate thickness and are arranged in a substantially concentric magnetic pole portion. Is disclosed. In the rotor of the rotating electrical machine disclosed in Patent Document 1, since the arc magnets are arranged in two layers in the radial direction, the amount of magnets is increased and the magnet torque is increased as compared with a rotor in which the arc magnets are arranged only in one layer. Can be.

A circular arc magnet can be obtained by cutting a ring-shaped magnet in the radial direction. It is known that a ring-shaped magnet is formed by molding using a hot working process. For example, Patent Literature 2 discloses an anisotropic ring-shaped magnet which is oriented in a radial direction by performing hot plastic deformation such as hot extrusion on a ring-shaped magnet material.

Japanese Patent Application Laid-Open No. 09-233744 Japanese Patent Application Laid-Open No. 02-276210

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.

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. Need to be.

However, in the rotor of the rotating electric machine disclosed in Patent Document 1, in order to increase the amount of the arc magnets in order to arrange the arc magnets having high-performance magnetization characteristics in a plurality of layers, the arc radius of the arc magnets may be changed according to the plate thickness. Also need to be larger. For this reason, when the arc magnet positioned on the outer diameter side of the rotor and the arc magnet positioned on the inner diameter side of the rotor are arranged substantially concentrically, the circumferential length of the magnetic pole portion increases, and the rotor becomes larger. I will.

(4) The present invention provides a rotor for a rotating electric machine that can use a circular arc magnet having high-performance magnetization characteristics while suppressing an increase in the size of a circular arc magnet in a magnetic pole part.

The present invention
A rotor core,
A plurality of magnetic pole portions arranged along the circumferential direction;
And a plurality of arc magnets constituting the magnetic pole portion,
Each magnetic pole part
It has at least two layers of magnet parts along the radial direction,
The magnet unit is
An outer-diameter-side magnet unit including at least one arc-shaped magnet arranged to be convex inward in the radial direction,
An inner diameter side magnet portion configured by at least a pair of the arc magnets arranged to be convex inward in the radial direction,
Each arc magnet, the inner peripheral surface and the outer peripheral surface have the same arc center,
The plate thickness of the arc magnet, the inner diameter side magnet portion is larger than the outer diameter side magnet portion,
The radius of the arc magnet, the inner diameter side magnet portion is larger than the outer diameter side magnet portion,
When the center axis of each magnetic pole portion is a d-axis and the axis separated by an electrical angle of 90 ° with respect to the d-axis is a q-axis, the arc magnet of the inner diameter side magnet portion and the arc magnet of the outer diameter side magnet portion are provided. The distance increases from the q axis to the d axis.

According to the present invention, it is possible to use an arc magnet having high-performance magnetization characteristics while suppressing an increase in the size of the arc magnet in the magnetic pole portion while suppressing an increase in size.

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 a magnetic pole portion of a rotor of the rotating electric machine in FIG. 1. FIG. 6 is an enlarged view around a magnetic pole portion of a rotor of a rotating electric machine according to a second embodiment of the present invention. It is a figure showing the modification of the rotor of the rotary electric machine of a 2nd embodiment of the present invention. FIG. 11 is an enlarged view around a magnetic pole portion of a rotor of a rotating electric machine according to a third embodiment of the present invention.

Hereinafter, embodiments of the rotor of the rotating electric machine according to the present invention will be described with reference to the accompanying drawings.

[First Embodiment]
First, a rotor of a rotary electric machine according to a first embodiment of the present invention will be described with reference to FIGS.

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).

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.

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 magnet portion 310 is inserted into the outer-diameter magnet insertion hole 410, and includes an outer-diameter arc magnet 810 that is arranged so as to protrude radially inward. The inner diameter side magnet section 320 is inserted into a pair of inner diameter side magnet insertion holes 421 and 422, respectively, and is constituted by a pair of inner diameter

side arc magnets

821 and 822 arranged so as to protrude radially inward.

The outer diameter side arc magnet 810 and the pair of inner diameter

side arc magnets

821 and 822 are magnetized in the radial direction. Further, the outer diameter side arc magnet 810 and the pair of inner diameter

side arc 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. .

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 arc magnets

821 and 822 have a first inner diameter side arc magnet 821 on the left side with respect to the d-axis and a second inner diameter side arc magnet 822 on the right side.

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 to 5, 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.

外 As shown in FIG. 2, the outer diameter side arc magnet 810 has an inner peripheral surface 810N and an outer peripheral surface 810F having the same arc center C10, a left end surface 810L, and a right end surface 810R. The first inner diameter side arc magnet 821 has an inner peripheral surface 821N and an outer peripheral surface 821F having the same arc center C21, a q-axis end surface 821Q, and a d-axis end surface 821D. The arc center C21 of the first inner radius arc magnet 821 is located on the right side opposite to the first inner radius arc magnet 821 with respect to the d axis. The second inner radius side arc magnet 822 has an inner peripheral surface 822N and an outer peripheral surface 822F having the same arc center C22, a q-axis end surface 822Q, and a d-axis end surface 822D. The arc center C22 of the second inner diameter side arc magnet 822 is located on the left side opposite to the second inner diameter side arc magnet 822 with respect to the d axis.

The outer diameter side arc magnet 810, the first inner diameter side arc magnet 821, and the second inner diameter side arc magnet 822 are, for example, radially cut ring-shaped magnets formed by molding using a hot working process. Can be used.

The plate thickness d21 of the first inner diameter side arc magnet 821 and the plate thickness d22 of the second inner diameter side arc magnet 822 are larger than the plate thickness d10 of the outer diameter side arc magnet 810. Thereby, the magnet amount of the first inner diameter side arc magnet 821 and the second inner diameter side arc 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.

In addition, as the thickness d21 of the first inner diameter side arc magnet 821 and the thickness d22 of the second inner diameter side arc magnet 822 are increased, the arc radius r21 and the second inner diameter of the inner peripheral surface 821N of the first inner diameter side arc magnet 821 are increased. The arc radius r22 of the inner peripheral surface 822N of the side arc magnet 822 is larger than the arc radius r10 of the inner peripheral surface 810N of the outer diameter arc magnet 810. Accordingly, the outer diameter side arc magnet 810, the first inner diameter side arc magnet 821, and the second inner diameter side arc magnet 822 having high-performance magnetization characteristics can be used, so that the output performance of the rotating electric machine can be improved.

Here, d10 / r10, which is a ratio of the arc radius r10 of the inner peripheral surface 810N of the outer diameter side arc magnet 810 to the plate thickness d10 of the outer diameter side arc magnet 810, and the inner circumference of the first inner diameter side arc magnet 821. D21 / r21, which is the ratio of the arc radius r21 of the surface 821N to the plate thickness d21 of the first inner diameter arc magnet 821, the arc radius r22 of the inner peripheral surface 822N of the second inner diameter arc magnet 822, and the second inner diameter It is preferable that d22 / r22, which is a ratio with the plate thickness d22 of the side arc magnet 822, have substantially the same value in a predetermined range. More preferably, the arc radius r21 of the inner peripheral surface 821N of the first inner diameter side arc magnet 821 and the arc radius r22 of the inner peripheral surface 822N of the second inner diameter side arc magnet 822 are the same, and the first inner diameter side arc magnet 821 is used. Is the same as the thickness d22 of the second inner diameter side arc magnet 822, and the first inner diameter side arc magnet 821 and the second inner diameter side arc magnet 822 have the same shape.

Further, the distance D11 between the first inner diameter side arc magnet 821 and the outer diameter side arc magnet 810 and the distance D12 between the second inner diameter side arc magnet 822 and the outer diameter side arc magnet 810 are both from the q axis to the d axis. It gets longer as you get closer.

(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. Accordingly, when increasing the magnet amounts of the first inner diameter side arc magnet 821 and the second inner diameter side arc magnet 822, the rotor 10 is capable of suppressing the increase in size and also having the outer diameter side arc magnet 810 having high-performance magnetizing characteristics. The first inner diameter side arc magnet 821 and the second inner diameter side arc magnet 822 can be used. 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 arc magnet 821 and the second inner diameter side arc magnet 822 and the outer diameter side arc magnet 810 is easily concentrated on the d-axis, and the magnet torque of the rotating electric machine can be used efficiently, The output performance of the rotating electric machine can be improved.

角 The angle θ10 between the imaginary line L3 connecting the central portion 810C of the outer diameter side arc magnet 810, the center C10 of the outer diameter side arc magnet 810, and the d axis is 0 °. That is, the virtual line L3 coincides with the d-axis. Thereby, the outer diameter side magnet part 310 can be constituted by one arc magnet, and furthermore, the outer diameter side magnet part 310 can be formed symmetrically with respect to the d axis. Can be obtained.

Further, the angle θ21 between the imaginary line L1 connecting the center portion 821C of the first inner diameter side arc magnet 821 and the arc center C21 of the first inner diameter side arc magnet 821 and the d axis is the second inner diameter side arc magnet 822. The angle θ22 between the imaginary line L2 connecting the center portion 822C of the second inner diameter side and the arc center C22 of the second inner diameter side arc magnet 822 and the d axis is equal. Thus, the inner diameter side magnet portion 320 can be formed symmetrically with respect to the d axis, so that an efficient arrangement for obtaining reluctance torque can be achieved.

The outer diameter side magnet insertion hole 410 has an inner peripheral wall surface 410N and an outer peripheral wall surface 410F formed along the inner peripheral surface 810N and the outer peripheral surface 810F of the outer diameter side arc magnet 810, a left wall surface 410L, a right wall surface 410R, Having. The first inner diameter side magnet insertion hole 421 includes an inner peripheral wall surface 421N and an outer peripheral wall surface 421F formed along the inner peripheral surface 821N and the outer peripheral surface 821F of the first inner diameter side arc magnet 821, a q-axis side wall surface 421Q, and d. And a shaft side wall surface 421D. The second inner diameter side magnet insertion hole 422 includes an inner peripheral wall surface 422N and an outer peripheral wall surface 422F formed along the inner peripheral surface 822N and the outer peripheral surface 822F of the second inner diameter side arc magnet 822, a q-axis side wall surface 422Q, and d. And a shaft side wall surface 422D.

A first rib 510 extending in the radial direction is formed between the d-axis side end surface 821D of the first inner diameter side arc magnet 821 and the d axis, and is connected to the d axis side end surface 822D of the second inner diameter side arc magnet 822. A second rib 520 extending in the radial direction is formed between the second rib 520 and the d-axis. Further, a gap 60 is provided between the first rib 510 and the second rib 520. Therefore, the gap 60 is provided so as to overlap the d-axis.

In this way, in the inner diameter side magnet section 320, a gap is formed on the d-axis, so that d-axis inductance can be reduced. Therefore, the difference between the d-axis inductance and the q-axis inductance can be increased, so that the reluctance torque can be effectively used, and the output performance of the rotating electric machine can be improved.

The first rib 510 includes the d-axis side wall surface 421 </ b> D of the first inner diameter side magnet insertion hole 421 and the left wall surface 61 of the gap 60. The second rib 520 is configured by the d-axis side wall surface 422D of the second inner diameter side magnet insertion hole 422 and the right wall surface 62 of the gap 60.

Therefore, the centrifugal load by the first inner diameter side arc magnet 821 is received by the first rib 510, and the centrifugal load by the second inner diameter side arc magnet 822 is received by the second rib 520. That is, the first rib 510 and the second rib 520 receive the centrifugal load by the first inner diameter side arc magnet 821 and the centrifugal load by the second inner diameter side arc magnet 822, respectively. Accordingly, it is possible to reduce the bending stress generated in the rotor core 20 due to the weight variation between the first inner diameter side arc magnet 821 and the second inner diameter side arc magnet 822.

Furthermore, the first ribs 510 and the second ribs 520 are provided in a substantially C-shape in which the distance D5 between the first ribs 510 and the second ribs 520 increases radially inward. Thus, the radius R of the radially outer end 511 and the radially inner end 512 of the first rib 510 and the radially outer end 521 and the radially inner end 522 of the second rib 520 are both increased. Therefore, the concentration of stress on both ends in the radial direction of the first rib 510 and the second rib 520 can be reduced.

冷媒 Here, the gap 60 may be supplied with a refrigerant. Thereby, the refrigerant can be supplied to the vicinity of the outer diameter side arc magnet 810, the first inner diameter side arc magnet 821, and the second inner diameter side arc magnet 822, so that the outer diameter side arc magnet 810, the first inner diameter side arc The magnet 821 and the second inner diameter side arc magnet 822 can be cooled more effectively.

[Second embodiment]
Next, a rotor 10A of the rotary electric machine according to the second embodiment of the present invention will be described with reference to FIGS. In the following description, the same components as those of the rotor 10 of the rotary electric machine according to the first embodiment are denoted by the same reference numerals, and the description is omitted or simplified. In the rotor 10 of the rotary electric machine according to the first embodiment, the outer-diameter magnet portion 310 is configured by the outer-diameter arc magnet 810 that is disposed so as to protrude radially inward. In the rotor 10A of the electric machine, the outer-diameter-side magnet portion 310 has a first outer-diameter-side arc magnet 811 disposed so as to protrude radially inward on the left side across the d-axis, and radially inward on the right side. And a second outer diameter side arc magnet 812 arranged so as to be convex.

Further, the rotor core 20 of the first embodiment has an arc-shaped outer diameter side magnet insertion hole 410 formed on the outer diameter side of the rotor core 20 and protruding radially inward, but the rotor core 20A of the second embodiment has A first outer diameter side magnet insertion hole 411 disposed on the outer diameter side of the rotor core 20A so as to project radially inward on the left side with respect to the d axis, and a radially inward projection on the right side. And a second outer-diameter-side magnet insertion hole 412 disposed at the second position.

As shown in FIG. 3, the first outer diameter side arc magnet 811 has an inner peripheral surface 811N and an outer peripheral surface 811F having the same arc center C11, a q-axis end surface 811Q, and a d-axis end surface 811D. The second outer diameter side arc magnet 812 has an inner peripheral surface 812N and an outer peripheral surface 812F having the same arc center C12, a q-axis side end surface 812Q, and a d-axis side end surface 812D.

The thickness d21 of the first inner diameter arc magnet 821 and the thickness d22 of the second inner diameter arc magnet 822 are the thickness d11 of the first outer diameter arc magnet 811 and the thickness d12 of the second outer diameter arc magnet 812. Is bigger than.

In addition, as the thickness d21 of the first inner diameter side arc magnet 821 and the thickness d22 of the second inner diameter side arc magnet 822 are increased, the arc radius r21 and the second inner diameter of the inner peripheral surface 821N of the first inner diameter side arc magnet 821 are increased. The arc radius r22 of the inner peripheral surface 822N of the side arc magnet 822 is the arc radius r11 of the inner peripheral surface 811N of the first outer radius arc magnet 811 and the arc radius r12 of the inner peripheral surface 812N of the second outer radius arc magnet 812. Is bigger than.

Here, d11 / r11, which is the ratio of the arc radius r11 of the inner peripheral surface 811N of the first outer-diameter arc magnet 811 to the plate thickness d11 of the first outer-diameter arc magnet 811, and the second outer-diameter arc magnet D12 / r12, which is the ratio of the arc radius r12 of the inner peripheral surface 812N of the inner peripheral surface 812 to the plate thickness d12 of the second outer diameter side arc magnet 812, is preferably substantially the same value within a predetermined range. More preferably, the arc radius r11 of the inner peripheral surface 811N of the first outer diameter side arc magnet 811 and the arc radius r12 of the inner peripheral surface 812N of the second outer diameter side arc magnet 812 are the same, and the first outer diameter side The plate thickness d11 of the arc magnet 811 and the plate thickness d12 of the second outer diameter side arc magnet 812 are the same, and the first outer diameter side arc magnet 811 and the second outer diameter side arc magnet 812 have the same shape. .

The distance D11 between the first inner diameter side arc magnet 821 and the first outer diameter side arc magnet 811 and the distance D12 between the second inner diameter side arc magnet 822 and the second outer diameter side arc magnet 812 are all q-axis. And is arranged so as to be longer as approaching the d-axis.

The angle θ11 between the imaginary line L31 connecting the central portion 811C of the first outer diameter side arc magnet 811 and the arc center C11 of the first outer diameter side arc magnet 811 and the d axis is the first inner diameter side arc. An angle θ21 formed between an imaginary line L1 connecting the central portion 821C of the magnet 821 and the arc center C21 of the first inner diameter side arc magnet 821 with the d axis is smaller. That is, θ11 <θ21 is satisfied. Similarly, the angle θ12 between the imaginary line L32 connecting the central portion 812C of the second outer diameter side arc magnet 812, the arc center C12 of the second outer diameter side arc magnet 812, and the d axis is the second inner diameter. The angle θ22 between the center line 822C of the side arc magnet 822 and the arc center C22 of the second inner diameter side arc magnet 822 and the d-axis is smaller than the angle θ22. That is, θ12 <θ22 is satisfied.

The first outer diameter side magnet insertion hole 411 includes an inner peripheral wall surface 411N and an outer peripheral wall surface 411F formed along the inner peripheral surface 811N and the outer peripheral surface 811F of the first outer diameter side arc magnet 811, and a q-axis side wall surface 411Q. , A d-axis side wall surface 411D, and the second outer diameter side magnet insertion hole 412 is formed along the inner peripheral surface 812N and the outer peripheral surface 812F of the second outer diameter side arc magnet 812. And an outer peripheral wall surface 412F, a q-axis side wall surface 412Q, and a d-axis side wall surface 412D.

Accordingly, in addition to the same effect as in the first embodiment, a pair of the first outer diameter side arc magnet 811 and the second outer diameter side is used in the outer diameter side magnet portion 310 instead of the long outer diameter side arc magnet 810. Since the arc magnet 812 can be used, the degree of freedom in magnet arrangement is improved. In the present embodiment, the arc center C21 of the first inner diameter side arc magnet 821 and the arc center C22 of the second inner diameter side arc magnet 822 are at the same position on the d axis. The arc center C21 and the arc center C22 of the second inner diameter side arc magnet 822 may be at different positions.

For example, as shown in FIG. 4, the arc center C21 of the first inner diameter side arc magnet 821 is located on the right side opposite to the first inner diameter side arc magnet 821 with respect to the d axis, and the second inner diameter side arc is formed. The arc center C22 of the magnet 822 may be located on the left side of the d-axis opposite to the second inner radius side arc magnet 822. Also in this case, by satisfying θ11 <θ21 and θ12 <θ22, the distance D11 between the first inner diameter side arc magnet 821 and the first outer diameter side arc magnet 811 and the second inner diameter side arc magnet 822 and the second outer diameter side The distance D12 from the arc magnet 810 can be increased from the q axis to the d axis.

[Third embodiment]
Next, a rotor 10B of the rotary electric machine according to the third 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 rotary electric machine according to the first embodiment are denoted by the same reference numerals, and the description is omitted or simplified. In the rotor 10 of the rotating electric machine according to the first embodiment, the magnet unit 300 has two layers in the radial direction of the outer diameter side magnet unit 310 and the inner diameter side magnet unit 320. However, the rotating electric machine according to the third embodiment. In the rotor 10B, the magnet unit 300 has three layers in the radial direction of the outer diameter magnet unit 310, the inner diameter magnet unit 320, and the innermost magnet unit 330 provided on the inner diameter side of the inner magnet unit 320. It has become.

Further, the rotor core 20B of the third embodiment further includes an outer diameter side magnet insertion hole 410, a first inner diameter side magnet insertion hole 421, and a second inner diameter side magnet insertion hole 422 of the rotor core 20 of the first embodiment. A first innermost-diameter magnet insertion hole 431 disposed on the inner diameter side of the first inner-diameter magnet insertion hole 421 so as to protrude radially inward to the left with the d-axis interposed therebetween; On the inner diameter side of the insertion hole 422, there is a second innermost-diameter-side magnet insertion hole 432 disposed so as to protrude radially inward on the left side with the d-axis interposed therebetween.

As shown in FIG. 5, the innermost magnet section 330 includes a first innermost circular arc magnet 831 disposed so as to protrude radially inward on the left side with respect to the d axis, and a radially inner side magnet magnet on the right side. And the second innermost-diameter arc magnet 832 arranged so as to be convex.

The first innermost-side arc magnet 831 has an inner peripheral surface 831N and an outer peripheral surface 831F having the same arc center C31, a q-axis end surface 831Q, and a d-axis end surface 831D. The second innermost arc magnet 832 has an inner peripheral surface 832N and an outer peripheral surface 832F having the same arc center C32, a q-axis end surface 832Q, and a d-axis end surface 832D.

The thickness d31 of the first innermost arc magnet 831 and the thickness d32 of the second innermost arc magnet 832 are the thickness d21 of the first inner diameter arc magnet 821 and the thickness d22 of the second inner diameter arc magnet 822. Is bigger than.

In addition, as the plate thickness d31 of the first innermost-side arc magnet 831 and the plate thickness d32 of the second innermost-side arc magnet 832 are increased, the arc radius r31 of the inner peripheral surface 831N of the first innermost-side arc magnet 831 and The arc radius r32 of the inner peripheral surface 832N of the second innermost circular arc magnet 832 is the arc radius r21 of the inner peripheral surface 821N of the first inner radial arc magnet 821 and the arc of the inner peripheral surface 822N of the second innermost circular arc magnet 822. It is larger than the radius r22.

Here, d31 / r31, which is the ratio of the arc radius r31 of the inner peripheral surface 831N of the first innermost-side arc magnet 831 to the plate thickness d31 of the first innermost-side arc magnet 831, and the second innermost-side arc The ratio d32 / r32, which is the ratio of the arc radius r32 of the inner peripheral surface 832N of the magnet 832 to the plate thickness d32 of the second innermost-diameter arc magnet 832, is d10 / r10, d21 / r21, d22 / r22. , Are preferably substantially the same in a predetermined range. More preferably, the arc radius r31 of the inner peripheral surface 831N of the first innermost circular arc magnet 831 and the arc radius r32 of the inner peripheral surface 832N of the second innermost circular magnet 832 are the same, and The thickness d31 of the arc-shaped magnet 831 and the thickness d32 of the second innermost-diameter arc magnet 832 are the same, and the first innermost-diameter arc magnet 831 and the second innermost-diameter arc magnet 832 have the same shape. .

The distance D21 between the first innermost-side arc magnet 831 and the first innermost-side arc magnet 821 and the distance D22 between the second innermost-side circular magnet 832 and the second innermost-side arc magnet 822 are both q-axis. And is arranged so as to be longer as approaching the d-axis.

Accordingly, in addition to the same effect as in the first embodiment, the amount of magnet of the magnetic pole part 30 can be further increased while suppressing the circumferential length of the magnetic pole part 30 from being increased.

The first innermost-side magnet insertion hole 431 includes an inner peripheral wall 431N and an outer peripheral wall 431F formed along the inner peripheral surface 831N and the outer peripheral surface 831F of the first innermost circular arc magnet 831; , And a d-axis side wall surface 431D, and the second innermost-diameter magnet insertion hole 432 is formed along the inner peripheral surface 832N and the outer peripheral surface 832F of the second innermost-diameter arc magnet 832. And an outer peripheral wall surface 432F, a q-axis side wall surface 432Q, and a d-axis side wall surface 432D.

A third rib 530 extending in the radial direction is formed between the d-axis side end surface 831D of the first innermost-side arc magnet 831 and the d-axis, and is connected to the d-axis side end surface 832D of the second innermost-side arc magnet 832. A fourth rib 540 extending in the radial direction is formed between the fourth rib 540 and the d-axis. Further, a second gap 600 is provided between the third rib 530 and the fourth rib 540. Therefore, the second gap 600 is provided so as to overlap with the d-axis.

The third rib 530 is configured by the d-axis side wall surface 431D of the first innermost magnet insertion hole 431 and the left wall surface 610 of the second gap 600. The fourth rib 540 is configured by the d-axis side wall surface 432D of the second innermost-diameter-side magnet insertion hole 432 and the right wall surface 620 of the second gap portion 600.

Furthermore, the third rib 530 and the fourth rib 540 are provided in a substantially C-shape in which the distance D50 between the third rib 530 and the fourth rib 540 increases toward the inside in the radial direction.

The above-described embodiment can be appropriately modified, improved, and the like.

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) a rotor core (rotor core 20);
A plurality of magnetic pole portions (magnetic pole portions 30) arranged along the circumferential direction;
A rotor (rotor 10) of a rotating electrical machine including a plurality of arc magnets (outer diameter side arc magnets 810, inner diameter side arc magnets 821 and 822) constituting the magnetic pole portion,
Each magnetic pole part
It has at least two layers of magnet parts (magnet parts 300) along the radial direction,
The magnet unit is
An outer magnet section (outer magnet section 310) including at least one arc magnet (outer arc magnet 810) arranged to be radially inwardly convex;
An inner diameter magnet portion (inner diameter magnet portion 320) composed of at least a pair of the arc magnets (inner diameter side arc magnets 821 and 822) arranged so as to be convex inward in the radial direction;
Each arc magnet has the same arc center (arc center C10, C21, C22) on the inner and outer peripheral surfaces,
The thickness of the arc-shaped magnet (plate thickness d10, d21, d22) is larger at the inner diameter side magnet part than at the outer diameter side magnet part,
The arc radius (arc radius r10, r21, r22) of the arc magnet is larger in the inner diameter side magnet part than in the outer diameter side magnet part,
When the center axis of each magnetic pole portion is a d-axis and the axis separated by an electrical angle of 90 ° with respect to the d-axis is a q-axis, the arc magnet of the inner diameter side magnet portion and the arc magnet of the outer diameter side magnet portion are provided. (Distances D11 and D12) increase from the q-axis toward the d-axis.

According to (1), the plate thickness and the arc radius of the arc magnet are larger in the inner diameter magnet portion than in the outer diameter magnet portion. That is, the arc radius of the arc magnet can be increased by an amount corresponding to an increase in the thickness of the arc magnet of the inner diameter side magnet portion than the thickness of the arc magnet of the outer diameter side magnet portion. Therefore, when increasing the magnet amount in each magnetic pole portion, it is possible to use a circular arc magnet having high-performance magnetization characteristics, and it is possible to improve the output performance of the rotating electric machine.
In addition, the distance between the arc magnet of the inner diameter side magnet portion and the arc magnet of the outer diameter side magnet portion increases from the q axis to the d axis. This can suppress an increase in the circumferential length of the magnetic pole portion, thereby suppressing an increase in the size of the rotor. Further, since the q-axis magnetic path can be widened, the reluctance torque of the rotating electric machine can be increased. Furthermore, since the magnet magnetic flux generated by the arc magnet of the inner diameter side magnet portion and the arc magnet of the outer diameter side magnet portion is easily concentrated on the d axis, the magnet torque of the rotating electric machine can be used efficiently.

(2) The rotor of the rotary electric machine according to (1),
The pair of arc magnets of the inner diameter side magnet portion,
A first arc magnet (a first inner diameter side arc magnet 821) located on one side in the circumferential direction with respect to the d axis;
A second arc magnet (a second inner radius arc magnet 822) located on the other side in the circumferential direction with respect to the d-axis,
An arc center (arc center C21) of the first arc magnet is located on the other side in the circumferential direction with respect to the d-axis;
An arc center (arc center C22) of the second arc magnet is located on one side in the circumferential direction with respect to the d-axis;
When viewed from the front of the rotor core, a first virtual line (virtual line L1) connecting a central portion (central portion 821C) of the first circular magnet and the circular center of the first circular magnet is formed with the d-axis. The angle (the angle θ21) is defined by a second virtual line (virtual line L2) connecting the center of the second arc magnet (central portion 822C) and the center of the arc of the second arc magnet, and the d-axis. A rotor of a rotary electric machine having an angle equal to an angle (an angle θ22).

According to (2), the arc center of the first arc magnet and the arc center of the second arc magnet are both located on the opposite side of the d-axis in the circumferential direction from the first arc magnet and the second arc magnet, and An angle between the first imaginary line connecting the center of the arc magnet and the center of the arc of the first arc magnet and the d-axis connects the center of the second arc magnet and the center of the arc of the second arc magnet. Since the angle formed by the second virtual line and the d-axis is equal, the inner diameter side magnet portion can be formed symmetrically with respect to the d-axis, and an efficient arrangement for obtaining reluctance torque can be achieved.

(3) The rotor of the rotary electric machine according to (2),
As viewed from the front of the rotor core, a center (central portion 810C) of the at least one arc magnet of the outer diameter magnet portion and an arc center (arc center C10) of the at least one arc magnet of the outer diameter magnet portion. Is the angle (angle θ10) between the third virtual line (virtual line L3) and the d axis, θ1,
When the angle between the first imaginary line and the second imaginary line and the d axis (the angle θ21, θ22) is θ2,
A rotor of a rotating electric machine that satisfies θ1 <θ2.

According to (3), the third imaginary line connecting the center of at least one arc magnet of the outer diameter magnet portion and the arc center of at least one arc magnet of the outer diameter magnet portion is formed by the d axis. Since the angle θ1 and the angle θ2 between the first virtual line and the second virtual line and the d axis satisfy θ1 <θ2, the distance between the first arc magnet and the outer diameter side arc magnet and the second arc magnet In each case, the distance between the outer diameter side arc magnet and the outer diameter side arc magnet can be increased from the q axis to the d axis.

(4) The rotor of the rotary electric machine according to (3),
The at least one arc magnet of the outer diameter magnet portion is configured by one arc magnet (outer diameter arc magnet 810),
The rotor of the rotating electric machine, wherein θ1 is zero.

According to (4), the outer-diameter magnet portion is formed of one arc magnet, and θ1 is zero, so that the outer-diameter magnet portion is formed symmetrically with respect to the d-axis. Thereby, a magnet torque can be efficiently obtained with a simple structure.

This application is based on a Japanese patent application filed on Sep. 28, 2018 (Japanese Patent Application No. 2018-185520), the contents of which are incorporated herein by reference.

Reference Signs List 10 rotor 20 rotor core 30 magnetic pole part 300 magnet part 310 outer diameter side magnet part 320 inner diameter side magnet part 810 outer diameter side arc magnet 810C central part 821 first inner diameter side arc magnet (inner diameter side arc magnet)
821C Central part 822 2nd inner diameter side arc magnet (inner diameter side arc magnet)
822C Center part C10, C21, C22 Arc centers r10, r21, r22 Arc radii d10, d21, d22 Plate thickness L1 Virtual line (first virtual line)
L2 virtual line (second virtual line)
L3 virtual line (third virtual line)
θ10 Angle formed (θ1)
Angle formed by θ21 and θ22 (θ2)

Claims

A rotor core,
A plurality of magnetic pole portions arranged along the circumferential direction;
And a plurality of arc magnets constituting the magnetic pole portion,
Each magnetic pole part
It has at least two layers of magnet parts along the radial direction,
The magnet unit is
An outer-diameter-side magnet unit including at least one arc-shaped magnet arranged to be convex inward in the radial direction,
An inner diameter side magnet portion configured by at least a pair of the arc magnets arranged to be convex inward in the radial direction,
Each arc magnet, the inner peripheral surface and the outer peripheral surface have the same arc center,
The plate thickness of the arc magnet, the inner diameter side magnet portion is larger than the outer diameter side magnet portion,
The arc radius of the arc magnet is larger in the inner diameter side magnet part than in the outer diameter side magnet part. The center axis of each magnetic pole part is d axis, and the axis separated by 90 ° in electrical angle with respect to the d axis. In the case of the q-axis, the distance between the arc-shaped magnet of the inner diameter-side magnet portion and the arc-shaped magnet of the outer diameter-side magnet portion increases as the distance from the q-axis to the d-axis increases.
It is a rotor of the rotary electric machine according to claim 1, wherein
The pair of arc magnets of the inner diameter side magnet portion,
A first arc magnet located on one side in the circumferential direction with respect to the d axis;
A second arc magnet located on the other side in the circumferential direction with respect to the d-axis,
The arc center of the first arc magnet is located on the other side in the circumferential direction with respect to the d-axis,
The arc center of the second arc magnet is located on one side in the circumferential direction with respect to the d axis,
When viewed from the front of the rotor core, the angle between the first imaginary line connecting the center of the first arc magnet and the arc center of the first arc magnet and the d-axis is the center of the second arc magnet. A rotor of the rotating electric machine, wherein the angle is equal to the angle between the second virtual line connecting the portion and the arc center of the second arc magnet with the d-axis.
It is a rotor of the rotary electric machine according to claim 2,
A third imaginary line connecting a central portion of the at least one arc magnet of the outer diameter side magnet portion and an arc center of the at least one arc magnet of the outer diameter side magnet portion in a front view of the rotor core; The angle formed with the d axis is θ1,
When the angle between the first virtual line and the second virtual line and the d-axis is θ2,
A rotor of a rotating electric machine that satisfies θ1 <θ2.
The rotor of the rotating electric machine according to claim 3, wherein
The at least one arc magnet of the outer diameter side magnet portion is configured by one arc magnet,
The rotor of the rotating electric machine, wherein θ1 is zero.