JP2008043157A - Inner rotor, and generator with inner rotor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inner rotor which is simply constituted, and securely prevents magnets integrally arranged in the inner rotor from jumping out toward an outer diameter side, involved in rotation of the inner rotor. <P>SOLUTION: The inner rotor is constituted including a plurality of the magnets 4, and a supporting frame 5, wherein the magnets are arranged at an outer periphery of an annular core 3 at predetermined intervals in a circumferential direction, and a rotating pivot 2 at an engine side penetrates a shaft core portion in the annular core. The supporting frame includes a plurality of supporting faces 5h, 5g which are brought into contact with a pair of circumferential side faces 4e, 4f, respectively, and support the magnets 4 so that these may be positioned in the circumferential direction, wherein the side faces are opposite to the circumferential direction of each magnet 4. The circumferential side faces 4e, 4f of each of the magnets, and the supporting faces 5h, 5g are formed on inclined faces in which a facing interval becomes narrower toward the outer diameter side, and jumping out is prevented by regulating displacement of the magnets 4 toward the outer diameter side. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention belongs to the technical field of an inner rotor that is mounted on a vehicle such as a motorcycle and rotates at high speed, and a generator that includes the inner rotor.

  In general, an inner rotor constituting a rotating electrical machine such as a generator or a brushless motor has a plurality of magnets arranged at predetermined intervals in the circumferential direction on the outer periphery of an annular iron core through which a rotation support shaft passes. There is something configured. When such an inner rotor is connected to the rotating shaft of a motorcycle engine and used as a constituent member of a generator that generates electric power based on the rotation of the engine, the inner rotor rotates at a high speed. It is assumed that the magnet to be scattered is scattered by centrifugal force, and countermeasures are required. As a countermeasure, a plurality of magnets provided on the outer periphery of the annular core are formed as a laminate in which protective poles are laminated on the outside of each magnet, and these laminates are fixed to the annular core with screws, thereby scattering the laminate. What was comprised so that prevention might be aimed at is known. However, in the above configuration, since the laminated body is fixed by screwing screws from the outer diameter direction, when the inner rotor rotates at a high speed, a strong centrifugal force acts to loosen the screws. There is a problem that it is assumed that rattling occurs or the screw is removed.

In order to improve this, the support frame is fitted on the outer periphery of the annular core, and the support surfaces formed on the support frame are brought into contact with the circumferential side surfaces of each laminate, thereby positioning the magnet in the circumferential direction. In this configuration, ring bodies are integrally provided at both ends of the support frame in the axial center direction, and ring-shaped regulating pieces protrude from the outer diameter edge portions of the ring bodies toward opposite sides. Formed and applied to the locking grooves formed at both ends in the axial direction of the protective poles provided on the outer periphery of the magnet from the outer diameter side to prevent scattering of the laminate. Something has been proposed (Patent Document 1).
Japanese Utility Model Publication No. 4-114766

  However, in the thing of the said patent document 1, since the pole for protection is provided in a magnet, or a ring body is each provided in the axial center direction both ends of a support frame, the number of parts increases and an assembly operation becomes complicated. There's a problem. In addition, since the restriction piece is configured to prevent scattering by supporting both ends in the axial direction of the magnet (laminate), if the number of magnets adjacent in the circumferential direction increases, the amount of support by the restriction piece becomes small. Therefore, there is a problem that there is a possibility that sufficient scattering prevention may not be performed. In addition, since the magnet is configured to be simply pressed from the outer diameter side by the restriction piece, it is assumed that rattling occurs when the inner rotor rotates due to dimensional errors, play formed between the members, and the like. There are also problems, and these are problems to be solved by the present invention.

The present invention has been made in view of the above-described circumstances and has been created for the purpose of solving these problems. The invention of claim 1 is directed to an inner rotor of a rotating electrical machine, wherein the rotation support shaft has an axial core portion. An annular core that passes through, a plurality of magnets arranged on the outer periphery of the annular core at predetermined intervals in the circumferential direction, and a pair of side surfaces facing each other in the circumferential direction of each magnet. A support frame having a plurality of support surfaces to be supported, and both sides of the magnets and support surfaces that are in contact with both sides are inclined surfaces in which the respective opposing intervals become narrower toward the outer diameter side, This is an inner rotor configured to restrict displacement of the magnet toward the outer diameter side.
According to a second aspect of the present invention, the magnet is sandwiched between a flange portion integrally formed at one axial end portion of the annular core and a ring-shaped portion integrally formed at the other axial end portion of the support frame. It is an inner rotor of Claim 1 currently supported by the shape.
The invention according to claim 3 is the inner rotor according to claim 1 or 2, wherein the inner rotor is fitted with a ring-shaped protective ring on the outer periphery of the magnet.
The invention according to claim 4 is the inner rotor according to any one of claims 1 to 3, wherein a backlash preventing means for repressing the magnet in the circumferential direction is provided between the support frame and the magnet. .
According to a fifth aspect of the present invention, there is provided an annular iron core in which the rotation support shaft passes through the shaft core portion, a plurality of magnets arranged on the outer circumference of the annular iron core at a predetermined interval in the circumferential direction, and opposed to the circumferential direction of each magnet. In constituting a generator including an inner rotor composed of a support frame having a plurality of support surfaces that are in contact with a pair of side surfaces and support the magnet in a circumferential positioning manner, both side surfaces of the magnets, A generator provided with an inner rotor configured to restrict the displacement of the magnet to the outer diameter side, with the support surfaces in contact with both side surfaces as inclined surfaces whose opposing intervals become narrower toward the outer diameter side. It is.

According to the first aspect of the present invention, it is possible to reliably prevent the magnets from being scattered with a simple configuration and with a small number of parts.
By setting it as invention of Claim 2, the movement of the axial direction of a magnet can be controlled and it can be set as a reliable inner rotor.
By making it invention of Claim 3, scattering of a magnet can be prevented more reliably.
According to the invention of claim 4, it is possible to prevent the play of the magnet and to provide an inner rotor with high reliability.
According to the invention of claim 5, it is possible to provide a highly reliable generator in which the scattering of the magnet is reliably prevented with a small number of parts.

Next, embodiments of the present invention will be described with reference to the drawings.
In the drawings, reference numeral 1 denotes an inner rotor that constitutes a generator mounted on a motorcycle. By integrally fitting a rotary shaft 2 in which the rotary shaft of an engine is interlocked with the inner rotor 1, The inner rotor 1 is configured to rotate integrally with the rotating shaft 2 by the rotation of the rotating shaft 2 as the engine is driven, and these configurations are the same as conventional ones.

  The annular iron core 3 constituting the inner rotor 1 is integrally formed of a magnetic material and includes a main body 3a having a predetermined outer diameter. The shaft core of the main body 3a (the shaft of the inner rotor 1) is formed. A through hole 3b through which the rotary shaft 2 passes is formed in the core part). Further, the annular iron core 3 is integrally formed with one end (one end) in the axial direction of the main body 3a, and a flange 3c extending to the outer diameter side and having a large diameter is formed integrally with the main body 3b. A small-diameter cylindrical portion 3e having a small diameter via a step surface 3d is formed at the other end in the axial direction.

A plurality (six in this embodiment) of magnets 4 are disposed on the outer periphery of the main body 3a of the annular core 3 via holding means such as adhesion. Each of the magnets 4 has a preset plate thickness (diameter thickness), is formed in an arc shape that is concentric with the axial core of the annular core 3, and has a pair of side surfaces that are opposed to each other in the radial direction. Among the outer arc-shaped side surfaces 4a and 4b, the inner-diameter side surface 4a is formed as an arc surface along the outer peripheral surface of the annular core body 3b, and the outer-diameter side surface 4b is an outer periphery of a support arm 5a of a support frame 5 described later. It is formed in a circular arc surface that is flush with the surface.
Furthermore, the axial direction one end side surface 4c and the other end side surface 4d, which are a pair of side surfaces facing each other in the axial direction of each magnet 4, are configured to include surfaces orthogonal to the axial direction, respectively. And the other end side surface 4d (the length in the axial direction of the magnet 4) is the axial direction length of the annular core body portion 3b, that is, the other end side surface of the flange portion 3c and the step surface 3d. The length is set between.
The length between the pair of circumferential side surfaces 4e and 4f facing the circumferential direction of the magnet 4 (the circumferential length of the magnet 4) is adjacent when fixed to the outer circumferential surface of the annular core body 3b. A predetermined gap is set between the magnets 3, and the circumferential side surfaces 4 e and 4 f opposed to the circumferential direction of the magnet 4 of the present embodiment are further connected to the circumferential side surfaces 4 e. The opposing distance between 4f is formed on an inclined surface that gradually narrows from the inner diameter side to the outer diameter side.

  A protective ring 6 is fitted on the outer periphery of the magnet 4 fixed to the outer periphery of the annular core body 3b in advance. The protective ring 6 is formed longer than the length of the magnet 4 in the axial direction. When the magnet 4 is externally fitted, the one end side edge 6a of the protective ring 6 projects into the flange stepped surface 3f formed by cutting out the other end on the outer diameter side of the annular core flange 3c. The other end side edge portion 6b is set so as to be fitted in a state protruding from the other end side surface 4d of the magnet 4 to the other end side.

  On the other hand, the support frame 5 is made of a non-magnetic material (in this embodiment, made of an aluminum material), and is incorporated in an annular core 3 having a magnet 4 and a protective ring 6 provided on the outer periphery. Is set to The support frame 5 includes a plurality of (six) support arms 5a (corresponding to the support surface of the present invention) inserted into a gap formed between adjacent magnets 4 on the outer periphery of the annular core 3; The other end portion in the axial direction of the support arm 5a is configured to include a ring-shaped base body 5b (corresponding to the ring-shaped portion of the present invention) integrated with a predetermined gap. Here, these six support arms 5a are formed at the intermediate portion in the radial direction of the base body 5b, and an inner diameter side abutting surface 5c is provided on the inner diameter side of the base body 5b. On the diameter side, outer diameter side abutting surfaces 5d are each formed in a ring shape.

Each support arm 5a disposed between the adjacent magnets 4 is opposed to a pair of inner and outer diameter side surfaces (inner diameter side surfaces, outer diameter side surfaces) 5e and 5f in the circumferential direction, and the circumference of the adjacent magnet 4 is It is formed in a prismatic shape having a pair of support surfaces (circumferential side surfaces) 5g and 5h that abut on the direction side surfaces 4f and 4e, and one axial side end side surface 5i. The inner diameter side surface 5e of the support arm 5a is formed in an arc surface having the same diameter as the arc surface of the magnet inner diameter side surface 4a so as to be an arc surface along the outer peripheral surface of the annular core 3, and the outer diameter side surface 5f is as described above. The outer diameter side surface 4b is formed to have the same diameter as the magnet outer diameter side surface 4b, and the support arm outer diameter side surface 5e and the magnet outer diameter side surface 4b are set to be flush with each other when the support arm 5a is assembled between the adjacent magnets 4. ing.
Furthermore, the circumferentially opposing support surfaces 5g and 5h of the adjacent support arms 5a are in contact with the circumferential side surfaces 4f and 4e of the magnet 4 positioned between them, respectively, and the circumferential positioning of the magnet 4 and The spacing between the support surfaces 5g and 5h that are opposed to each other in the circumferential direction of the adjacent support arms 5a is opposite to the circumferential side surfaces 4e and 4f of the magnet 4 that abuts them. Similarly to the interval, the width is narrowed from the inner diameter side to the outer diameter side, and is set to be an inclined surface having the same inclination angle as that of the magnet circumferential side surfaces 4e and 4f. Incidentally, by forming the support surfaces 5g and 5h opposed to each other in the circumferential direction of the adjacent support arms 5a in this manner on the inclined surfaces that become narrower from the inner diameter side to the outer diameter side, each support arm 5a has an outer diameter side. It is formed in an arc-shaped body with a wider opposing interval.

Then, the support frame 5 positions the support arm 5a between the outer peripheral surface of the annular core 3 and the inner peripheral surface of the protective ring 6 against the gap between the adjacent magnets 4, and in this state, By inserting the support frame 5 until the inner diameter side abutting surface 5c comes into contact with the stepped surface 3d of the annular core 3, the support frame 5 is incorporated into the annular core 3 and the inner rotor 1 is configured. Yes.
At this time, the axial direction one end side surface 5i of the support arm 5a is set to abut against the other end side surface of the annular core flange portion 3c. Then, the end of the fixing screw 5k screwed from one end side of the support arm 5a is screwed to the annular core flange portion 3c, whereby the support frame 5 is fixed integrally with the annular core 3, and the inner rotor 1 is fixed. Is configured to configure. In the fixed state, the outer peripheral surface of the protection ring 6 is set to be flush with the outer peripheral surface of the annular core flange portion 3c and the outer peripheral surface of the support frame base body 5b.

In this fixed state, each magnet 4 is supported in a state in which a pair of circumferential side surfaces 4e and 4f whose opposing intervals are narrowed toward the outer diameter side are in contact with the support surfaces 5g and 5h of the adjacent support arm 5a. ing. Thereby, in the radial direction (radial direction) with respect to the axial core portion of the annular core 3, the inclined surfaces of the support frame support surfaces 5h and 5g are on the outer diameter side with respect to the magnet circumferential side surfaces 4e and 4f, respectively. It is in a positional relationship of being stacked and the opposing distance on the outer diameter side of the support pieces 5g, 5h is narrower than the inner diameter side portion of the magnet 4, so that the magnet 4 releases the support from the support pieces 5g, 5h. Is set so that it cannot be pulled out to the outer diameter side. As a result, when the inner rotor 1 rotates, the support surfaces 5h and 5g of the support frame 5 have the outer diameter while the support member that presses the magnet 4 from the outer diameter side surface 4b to the inner diameter side is not provided. The circumferential side surfaces 4e and 4f of the magnet 4 that is about to move in the direction are pressed, and the movement of the magnet 4 to the outer diameter side is regulated.
When the inner rotor 1 rotates at a high speed together with the rotary shaft 2 as the engine is driven, the support surfaces 5g and 5h formed on the support frame 5 regulate the displacement of the magnet 4 in the outer diameter direction. Is set so as to surely prevent the magnet 4 from popping out to the outer diameter side by the protective ring 6 disposed on the outer periphery of the magnet 4.
Incidentally, the one end side surface 4c and the other end side surface 4d that face the axial direction of the magnet 4 receive these support by being sandwiched between the annular core flange portion 3c and the support frame base body 5b, The magnet 4 is set so as to restrict displacement in the axial direction.

In the present embodiment configured as described, when the engine is started and driven to rotate, the rotating shaft 2 linked to the engine rotates, and the inner rotor 1 rotates together with the rotating shaft 2 by the generator. Electricity is generated. In this case, the plurality of magnets 4 provided on the outer circumferential surface of the annular core 3 constituting the inner rotor 1 are adjacent to the circumferential side surfaces 4e and 4f facing the circumferential direction of the arbitrary magnet 4 in the circumferential direction. The support surfaces 5h and 5g formed on the support frame 5 come into contact with each other. At this time, the circumferential side surfaces 4e and 4f and the support surfaces 5h and 5g are separated from the inner diameter side as described above. It is formed so as to become narrower toward the radial side, and the support frame support surfaces 5g and 5h are applied from the outer radial direction to the magnet circumferential side surfaces 4e and 4f, so that the magnet 4 moves in the outer radial direction. Therefore, the magnet 4 is prevented from coming out of the support frame 5. As a result, while the prevention of scattering of the magnet 4 can be surely performed, the number of parts can be reduced, and the assembling work is facilitated, thereby realizing a reduction in cost.
In addition, in this case, both sides of the magnet 4 in the axial direction are not supported by the support frame 5 to prevent scattering, but the support pieces 5h, 5g support the circumferential side surfaces 4e, 4f facing the circumferential direction. Since it is configured to prevent scattering, even if the number of magnets 4 adjacent in the circumferential direction increases, the support amount by the support surfaces 5g and 5h of the support frame 5 does not change, and a good support state is obtained. Can do.

  Furthermore, in the embodiment in which the present invention is implemented, an inclined surface in which the gap between the opposing sides of the circumferential side surfaces 4e and 4f and the support surfaces 5h and 5g, which are contact portions between the magnet 4 and the support arm 5a, is narrowed toward the outer diameter side. Therefore, the number of parts does not increase and the configuration can be simplified.

  In addition, in this configuration, both end surfaces 4c, 4d in the axial direction of the magnet 4 are supported in a sandwiched manner by the annular core flange portion 3c and the support frame base body 4b. Position restriction can also be performed without using a separate member.

  In addition, since the protective ring 6 is externally fitted on the outer diameter side of the magnet 4, the number of parts can be kept to a minimum and the magnet 4 can be reliably prevented from being scattered. Mounting of the ring 6 is easy and workability of assembling work can be improved.

Of course, the present invention is not limited to the above-described embodiment, and may be configured as in the second and third embodiments shown in FIG.
The inner rotor 7 of the second embodiment shown in FIGS. 4A and 4B uses the same annular iron core 3 and six circumferential magnets 4 as those of the first embodiment. As for the support frame 7, the basic configuration is the same as that of the first embodiment and the same effect can be obtained. However, the support frame 8 of the present embodiment is made of a resin material. The formed one is used. Further, in the support frame 8, the bosses 8d constituting the backlash preventing means of the present invention are arranged on the support surfaces 8b and 8c formed on the support arm 8a toward the circumferential side surfaces 4f and 4e of the adjacent magnets 4. It is integrally formed in a protruding state. Here, the support frame may be made of an aluminum mold as in the first embodiment, and the boss may be integrally attached via any fixing means such as adhesion.
The support frame 8 according to the second embodiment is incorporated into the magnet 4 in a forcibly fitted state with the boss 8d elastically deformed when the support arm 8a is inserted between the adjacent magnets 4. Thus, the boss 8d presses the magnet 4 in the circumferential direction, and the pressing force is set so as to urge (guide) the magnet 4 toward the annular core 3 side (inner diameter side). As a result, the integration of the magnet 4 and the annular core 3 is promoted, the magnetic path formation in the inner rotor 7 is improved, the backlash of the magnet 4 is prevented, and a more reliable inner rotor is provided. be able to.

FIG. 4C shows a third embodiment. In the third embodiment, the support surface 9b of the support arm 9a formed on the resin-made support frame 9 is used as a backlash preventing means. An elastic body 9d that is curved toward the magnet 4 is formed on 9c, and the elastic body 9d elastically presses the magnet 4 in the circumferential direction, so that the magnet 4 can be moved in the same manner as in the second embodiment. It is configured to urge toward the inner diameter side to promote integration with the annular iron core 3 and to prevent the magnet 4 from rattling. By configuring in this way, a more reliable inner A rotor can be provided.
In the second and third embodiments, bosses and elastic bodies as rattling prevention means are provided on the support frame side. However, it is also possible to provide a structure provided on the circumferential side surface of the magnet.

1A and 1B are a side view and a perspective view of the inner rotor, respectively. It is XX sectional drawing in FIG. 1 (A). It is a disassembled perspective view explaining the incorporating state of an inner rotor. 4A, 4B, and 4C are respectively a side view of an inner rotor in the second embodiment, a perspective view in which a part of the support frame in the second embodiment is cut away, and a third view. It is the perspective view which notched a part of support frame in an embodiment.

Explanation of symbols

Reference Signs List 1 inner rotor 3 annular core 4 magnet 4e circumferential side surface 5 support frame 5a support arm 5g support surface 6 protective ring

Claims (5)

  In an inner rotor of a rotating electrical machine, an annular iron core with a rotating support shaft penetrating the shaft core, a plurality of magnets arranged at predetermined intervals in the circumferential direction on the outer circumference of the annular iron core, and opposed to the circumferential direction of each magnet Each of the side surfaces of the magnets, and a support frame having a plurality of support surfaces for supporting the magnet in a circumferential positioning manner. An inner rotor configured to restrict displacement of the magnet to the outer diameter side as an inclined surface in which the interval between the opposing faces becomes narrower toward the outer diameter side.   The magnet is supported in a sandwiched manner between a flange portion integrally formed at one axial end portion of the annular iron core and a ring-shaped portion integrally formed at the other axial end portion of the support frame. Item 6. The inner rotor according to Item 1.   The inner rotor according to claim 1 or 2, wherein a ring-shaped protective ring is fitted on the outer periphery of the magnet.   The inner rotor according to any one of claims 1 to 3, wherein a backlash preventing means for repressing the magnet in a circumferential direction is provided between the support frame and the magnet.   An annular core in which the rotation support shaft passes through the shaft core, a plurality of magnets arranged on the outer periphery of the annular core at predetermined intervals in the circumferential direction, and a pair of side surfaces facing each other in the circumferential direction are respectively contacted. In forming a generator including an inner rotor that includes a support frame having a plurality of support surfaces that are in contact with each other and support the magnets in a circumferential positioning manner, both side surfaces of each of the magnets and supports that abut against the both side surfaces A generator provided with an inner rotor configured to restrict the displacement of the magnet to the outer diameter side, with each surface being an inclined surface whose opposing distance becomes narrower toward the outer diameter side.

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