WO2023026675A1

WO2023026675A1 - Rotary electrical machine

Info

Publication number: WO2023026675A1
Application number: PCT/JP2022/025474
Authority: WO
Inventors: 徹也小川
Original assignee: 株式会社神戸製鋼所
Priority date: 2021-08-26
Filing date: 2022-06-27
Publication date: 2023-03-02
Also published as: JP2023031996A

Abstract

In the present invention, a plurality of magnetized magnetic pole blocks in a rotator each have: an iron core disposed so as to oppose a stator; and a plurality of permanent magnets which surround the iron core with at least a surface opposing the stator to be left open. The plurality of permanent magnets each have a parallelepiped shape or a cube shape. The rotator comprises a back yoke which has a polygonal shaped contour for the outer circumferential surface or the inner circumferential surface, in a cross-section with the rotation axis direction as a normal direction, and which has sequentially arranged thereon the plurality of magnetic pole blocks on the outer peripheral faces or the inner peripheral faces that are flat in the circumferential direction.

Description

Rotating electric machine

The present invention relates to a rotating electric machine that is used as at least one of a motor (electric motor) and a generator.

Motors (electric motors, electric motors) that convert electrical energy into mechanical energy are used for various purposes. Generally, a rotor (rotor) having an output shaft and rotating and a stator ( The rotor is rotated by a rotating magnetic field (rotating magnetic field).

A rotor of such a motor is disclosed in Patent Document 1, for example. The rotor structure of the electric motor disclosed in this patent document 1 includes a support body having a polygonal contour and configured concentrically with the rotation axis of the rotor structure, and the polygonal contour of the support. a magnet ring mounted in a form-fitting manner on the and magnetized to have a plurality of poles.

On the other hand, the motor can also function as a generator that converts mechanical energy into electrical energy by changing the input of electrical energy into the input of mechanical energy. Therefore, in this document, a rotating electric machine is defined as a device that is used as at least one of a motor (electric motor) and a generator.

By the way, the magnet ring in the rotor structure of the electric motor disclosed in Patent Document 1 is composed of a plurality of magnets arranged in sequence in the circumferential direction. The abutting surface is an inclined surface so as to abut in a ring shape without gaps. For this reason, high processing precision is required for manufacturing the magnet ring.

JP 2005-287292 A

The present invention has been made in view of the circumstances described above, and its object is to provide a rotating electric machine capable of reducing the machining accuracy required for manufacturing magnets.

In the rotary electric machine according to the present invention, the plurality of magnetic pole blocks in the rotor each have an iron core arranged to face the stator, and the facing surface of the stator is at least open. a plurality of permanent magnets surrounding the iron core, each of the plurality of permanent magnets has a rectangular parallelepiped shape or a cubic shape, and the rotor has an outer peripheral surface or a The back yoke has a polygonal contour shape on the inner peripheral surface, and the plurality of magnetic pole blocks are sequentially arranged on the outer peripheral surface or the inner peripheral surface that is flat in the circumferential direction.

The above and other objects, features and advantages of the present invention will become apparent from the following detailed description and accompanying drawings.

1 is a cross-sectional view showing the configuration of a rotating electrical machine in an embodiment; FIG. It is a figure for demonstrating the rotor in the said rotary electric machine. It is a figure for demonstrating the holding|maintenance aspect of the magnetic pole block in the said rotor. FIG. 10 is a diagram for explaining a rotor of a first modification; It is a figure for demonstrating the rotor of a 2nd modification. It is a figure for demonstrating the rotor of a 3rd modification. It is a figure for demonstrating the rotor of a 4th and 5th modification. It is a figure for demonstrating the structure of the rotary electric machine in a deformation|transformation.

One or more embodiments of the present invention will be described below with reference to the drawings. However, the scope of the invention is not limited to the disclosed embodiments. It should be noted that the configurations denoted by the same reference numerals in each figure indicate the same configurations, and the description thereof will be omitted as appropriate. In the present specification, reference numerals with suffixes omitted are used when referring to generically, and reference numerals with suffixes are used when referring to individual configurations.

A rotating electric machine in an embodiment is a device that is used as at least one of a motor (electric motor) and a generator, and includes a stator having a plurality of coils and a rotor having a plurality of magnetized magnetic pole blocks. Prepare. Each of the plurality of magnetic pole blocks includes an iron core arranged to face the stator, and a plurality of permanent magnets surrounding the iron core with at least a surface facing the stator open, Each of the plurality of permanent magnets has a rectangular parallelepiped shape or a cubic shape. The rotor has an outer peripheral surface or an inner peripheral surface that has a polygonal contour shape in a cross section normal to the direction of the rotation axis, and the plurality of magnetic pole blocks have a flat outer peripheral surface in the circumferential direction. Alternatively, the back yoke is further provided sequentially on the inner peripheral surface. Hereinafter, such a rotating electric machine will be described more specifically. In the following description, the rotating electric machine is assumed to be a motor (electric motor). A description of the generator is omitted.

FIG. 1 is a cross-sectional view showing the configuration of a rotating electric machine according to an embodiment. FIG. 2 is a diagram for explaining a rotor in the rotating electric machine. 2A is a perspective view of a portion of a rotor, FIG. 2B is a cross-sectional view of a portion of the rotor, and FIG. 2C is a magnetization direction of a magnet in the portion of the rotor shown in FIG. 2A. It is a figure for showing.

The rotary electric machine Ma in the embodiment includes, for example, a stator 1a, a rotor 2a, and a rotating shaft (output shaft) 3a, as shown in FIG. 1, and the rotor 2a can rotate inside the stator 1a. It is an inner rotor type that is placed in the

The stator 1a is a component that includes a plurality of coils 13a and generates a magnetic field for rotating the rotor 2a by the plurality of coils 13a. More specifically, as shown in FIG. 1, the stator 1a includes, for example, an annular (cylindrical) yoke portion 11a and an inner circumferential surface of the yoke portion 11a, which are arranged at regular intervals in the circumferential direction. It has a plurality of columnar tooth portions 12a protruding radially inward (toward the center) from the peripheral surface, and a plurality of coils 13a wound around each of the plurality of tooth portions 12a. The yoke portion 11a and the teeth portion 12a are made of a soft magnetic material such as soft iron or soft ferrite, integrally or in combination.

The rotor 2a has a plurality of magnetized magnetic pole blocks 21a, and magnetic interaction between each magnetic field (rotating magnetic field) generated by the stator 1a and each magnetic field generated by the plurality of magnetic pole blocks 21a produces It is a rotating part. The rotor 2a is fixedly attached to a cylindrical rotating shaft (output shaft) 3a. More specifically, the rotor 2a includes, for example, a plurality of magnetic pole blocks 21a and a back yoke 22a, as shown in FIG.

Each of the plurality of magnetic pole blocks 21a includes an iron core 211a arranged to face the stator 1a, and a plurality of permanent magnets 212a surrounding the iron core 211a with at least a surface facing the stator 1a open. , 213a, 214a. Each of the plurality of

permanent magnets

212a, 213a, 214a has a rectangular parallelepiped shape or a cubic shape. Such a magnetic pole block 21a is magnetized as shown in FIG. 2C to increase the magnetic flux generated in the gap (air gap) between the stator 1a and the rotor 2a. JP-A-2019-75848). The back yoke 22a is a member having a polygonal outline shape on the outer peripheral surface or the inner peripheral surface in a cross section normal to the extension direction (rotating shaft direction) of the rotating shaft 3a. Similarly, it is made of a soft magnetic material. Here, since the rotary electric machine Ma is of the inner rotor type, the contour shape of the outer peripheral surface is polygonal. The plurality of magnetic pole blocks 21a are sequentially arranged in the circumferential direction on the flat outer peripheral surface formed by the polygonal shape.

More specifically, the plurality of magnetic pole blocks 21a sequentially arranged in the circumferential direction are arranged in a plurality of rows in the rotation axis direction, the iron core 211a is a hexahedron, and the plurality of permanent magnetic pole blocks 211a are arranged in parallel. The

magnets

212a, 213a, 214a are a first permanent magnet (R magnet) 212a arranged on the bottom surface of the iron core 211a, and a second permanent magnet (th magnet) 213a, and a third permanent magnet (Z magnet) 214a disposed between each row. In the magnetic pole block 21a, one side surface of the iron core 211a along the rotation axis direction is surrounded by the second permanent magnet 213a of the magnetic pole block 21a, and the other side surface of the iron core 211a along the rotation axis direction is: By sequentially arranging the plurality of magnetic pole blocks 21a on the flat outer peripheral surfaces of the back yoke 22a in the circumferential direction, the other magnetic pole blocks 21a arranged adjacent to the magnetic pole block 21a in the circumferential direction It is surrounded by the second permanent magnet 213a. Therefore, in the example shown in FIG. 2, one iron core 211a is rotated by first to third

permanent magnets

212a, 213a, and 214a on four surfaces, ie, a bottom surface, two side surfaces along the rotation axis direction, and side surfaces between rows. Surrounded. In the example shown in FIG. 2, the plurality of magnetic pole blocks 21a are arranged in two rows on each outer peripheral surface of the back yoke 22a. may be arranged on each outer peripheral surface of the back yoke 22a.

The first to third

permanent magnets

212a, 213a, 214a, respectively, may be, for example, alnico magnets, ferrite magnets, etc., but are neodymium magnets because they are strong. Since the first to third

permanent magnets

212a, 213a, 214a are each rectangular parallelepiped-shaped or cubic-shaped as described above, the first to third

permanent magnets

212a, 213a, 214a are shown in FIG. 2B, respectively. As shown, it is in close contact with the flat outer peripheral surface of the back yoke 22a. On the other hand, both side surfaces of the first permanent magnet 212a along the rotational axis direction and side surfaces of the second permanent magnets 213a disposed on the respective side surfaces along the rotational axis direction are arranged as shown in FIG. 2B. There is a slight wedge-shaped gap at the bottom.

The iron core 211a is a member made of a soft magnetic material, similar to the yoke portion 11a. The surface of the iron core 211a facing the stator 1a (the open surface to which the permanent magnets are not in contact) has a curvature in the circumferential direction and does not have a curvature in the rotation axis direction (curvature infinite radius). When the second permanent magnet 213a among the plurality of

permanent magnets

212a, 213a, and 214a, which is disposed on the side surface of the iron core 211a, is disposed on the back yoke 22a, the side surface of the iron core 211a It is formed so as to come into surface contact with the second permanent magnet 213a disposed on the side surface of 211a. In the example shown in FIG. 2, since the second permanent magnet 213a has a rectangular parallelepiped shape or a cubic shape, the side surface of the iron core 211a is flat, and the second permanent magnet 213a is arranged on the flat outer peripheral surface of the back yoke 22a. Therefore, the side surface of the iron core 211a is an inclined surface. More specifically, both side surfaces of the iron core 211a along the rotation axis direction (both side surfaces opposed in the circumferential direction) are inclined surfaces that widen from the radially inner side toward the radially outer side. Since the first permanent magnet 212a is rectangular parallelepiped or cubic, the bottom surface of the iron core 211a in contact with the first permanent magnet 212a is flat, and the circumferential direction of the iron core 211a in contact with the third permanent magnet 214a is flat. Since the third permanent magnet 214a has a rectangular parallelepiped shape or a cubic shape, the side surface along it is flat.

As described above, in the rotary electric machine Ma according to the embodiment, the plurality of first to third permanent magnets 212a to 214a in the magnetic pole block 21a are each rectangular parallelepiped or cubic. can be reduced. In the rotary electric machine Ma, since the back yoke 22a has a polygonal profile cross section, the first to third permanent magnets 212a to 214a are arranged on the flat outer peripheral surface. It is possible to bring the first to third permanent magnets 212a to 214a and the back yoke 22a into close contact with each other. Therefore, it is possible to prevent deterioration in performance due to the occurrence of gaps.

In the rotary electric machine Ma, in the iron core 211a that can be machined, the surface facing the stator 1a is a curved surface having a curvature in the circumferential direction. can be formed well.

In the rotating electric machine Ma, even if the iron core 211a and the second permanent magnet 213a are in contact with each other on the inclined surface, the iron core 211a can be machined, and the side surface of the iron core 211a is disposed on the side surface of the iron core 211a. Since it is formed so as to abut on the surface of the second permanent magnet 213a, it can be formed with high accuracy. Therefore, it is possible to ensure the necessary tolerance.

In the above-described embodiment, each magnetic pole block 21a may be arranged on the outer peripheral surface of the back yoke 22a by bonding with an adhesive, for example, as shown in FIG. 3A. In order to prevent the magnetic pole blocks 21a from falling off due to force, the rotor 2a may further include a holding member for the magnetic pole blocks 21a, as shown in FIGS. 3B and 3C.

FIG. 3 is a diagram for explaining how the magnetic pole blocks are held in the rotor. 3A shows the case where the magnetic pole block 21a is arranged on the back yoke 22a only with an adhesive, FIG. 3B shows the case where the magnetic pole block 21a is held on the back yoke 22a by the holding member of the first embodiment, and FIG. 3C. shows the case where the magnetic pole block 21a is held on the back yoke 22a by the holding member of the second mode.

More specifically, for example, as shown in FIG. 3B, the holding member 4 of the first mode holds the plurality of magnetic pole blocks 21a sequentially arranged in the circumferential direction from the outer peripheral side. Annular holding members 41 (41-1 to 41-3) formed to extend in the circumferential direction are provided, and the annular holding members 41-1 to 41-3 are arranged at intervals in the rotation axis direction. , three in the example shown in FIG. 3B. More specifically, the holding member 4 of the first aspect includes, in addition to a plurality of annular holding members (first holding members) 41 (41-1 to 41-3) formed to extend in the circumferential direction, It includes a plurality of second holding members 42 formed to extend along the direction of the rotation axis and spaced apart in the circumferential direction (FIG. 3B shows one of the plurality of second holding members 42 Four second holding members 42-1 through 42-4 are shown). In other words, the holding member 4 of the first aspect is a mesh-like holding member ( grid-shaped holding member) 4. The holding member 4 of the first mode includes at least one of the three first holding members 41-1 to 41-3, and in the example shown in FIG. The plurality of second holding members 42 are arranged on the third permanent magnets 414a arranged on the side surfaces along the circumferential direction, and the plurality of second holding members 42 are respectively arranged on the side surfaces of the iron core 411a along the rotation axis direction. It is arranged on the permanent magnet 413a. In other words, the magnetic pole block 21a is held by surrounding the iron core 211a with the mesh of the first and second holding members 41 and 42 .

For example, as shown in FIG. 3C, the holding member 5 of the second aspect holds the plurality of magnetic pole blocks 21a sequentially arranged in the circumferential direction from the outer peripheral side in the same manner as the holding member 4 of the first aspect. However, the mesh-like holding member (lattice-like holding member) 5 formed in a mesh shape (lattice-like shape) has a plurality of four first holding members 51-1 to 51- 4, the inner two first holding members 51-2 and 51-3 and the plurality of second holding members 51 and 52 are arranged on the surface of the iron core 211a facing the stator 1a. ing. FIG. 3C shows four second holding members 52-1 to 52-4 out of the plurality of second holding members 52. As shown in FIG.

In the first and second holding modes described above, the plurality of magnetic pole blocks 21a sequentially arranged in the circumferential direction so that the

annular holding members

41 and 51 overlap the iron core 211a are provided at both outer ends. You may provide the grooved line formed so that it might extend in the circumferential direction around one round.

Further, in the above-described embodiment, when the rotor 2a rotates, not only the above-described centrifugal force but also torque is applied to the magnetic pole blocks 21a in the circumferential direction. For this reason, the rotating electric machine Ma includes a magnetic pole block having a first engaging portion formed on the outer surface, a second engaging portion engaging with the first engaging portion, and a second engaging portion engaging the first engaging portion. may further include a magnetic pole block holding member arranged on a side surface of the back yoke so as to engage the second engaging portion with the magnetic pole block holding member. This can prevent the magnetic pole block 21b from being displaced.

FIG. 4 is a diagram for explaining the rotor of the first modification. FIG. 4A is a top view of the rotor 2b of the first modification, in which the magnetic pole block holding members 6 (6-1, 6-2) are arranged on both side surfaces, viewed from the radial direction, and FIG. 4C is a perspective view of the magnetic pole block holding member 6, and FIG. 4C is a partially enlarged plan view of the magnetic pole block holding member 6. FIG.

The rotor 2b in this first modification is configured in the same manner as the rotor 2a described above, except that the magnetic pole block 21b is used instead of the magnetic pole block 21a and the magnetic pole block holding member 6 is further provided.

As shown in FIG. 4A, the magnetic pole block 21b used for the rotor 2b in the first modification is obtained by cutting out the concave portion 215b as the first engaging portion and the upper end portion of the outer surface of the second permanent magnet 213b. , is formed in the same manner as the magnetic pole block 21a.

As shown in FIGS. 4B and 4C, the magnetic pole block holding member 6 is a circular member made of a non-magnetic material such as aluminum or brass or a non-magnetic material such as carbon fiber or plastic in consideration of workability. It is an annular plate-shaped member, and a plurality of projections 61 projecting in the direction of the rotating shaft are formed on the side surface thereof as second engaging portions at equal intervals in the circumferential direction. Two magnetic pole block holding members 6-1 and 6-2 are prepared, and the magnetic pole block holding member 6-1 engages each second engaging portion 61 with each first engaging portion 215b of each magnetic pole block 21b. The magnetic pole block holding member 6-2 is arranged on one side surface of the back yoke 22b (not shown) and engages the second engaging portions 61 with the first engaging portions 215b of the magnetic pole blocks 21b. and is arranged on the other side surface of the back yoke 22b (not shown).

In the above description, the recessed portion 215b as the first engaging portion is formed at the upper end portion of the outer surface of the second permanent magnet 213b. All you have to do is For example, the recess 215b as the first engaging portion may be formed at any position on the outer surface of the second permanent magnet 213b, or may be formed at any position on the outer surface of the iron core 211b. Further, in the above description, the first engaging portion is the concave portion 215b and the second engaging portion is the convex portion 61, but the first engaging portion is the convex portion and the second engaging portion The portion may be a recess.

Further, in the above-described embodiment, the plurality of magnetic pole blocks 21a sequentially arranged in the circumferential direction are arranged in a plurality of rows in the rotation axis direction, and the magnetic pole blocks 21a in each row are arranged in the circumferential direction with respect to each other. The plurality of magnetic pole blocks 21c arranged in alignment but sequentially arranged in the circumferential direction are arranged in a plurality of rows in the rotation axis direction, and the magnetic pole blocks in each row are displaced from each other in the circumferential direction. may be arranged As a result, so-called cogging torque can be reduced.

FIG. 5 is a diagram for explaining the rotor of the second modification. More specifically, the rotor 2c in this second modified embodiment has a back yoke (not shown) in which the ridge lines formed by the polygonal shape are shifted in the circumferential direction for each row instead of the back yoke 22a. It is constructed in the same manner as the rotor 2a described above except that it is used. Since the ridges of the back yoke (not shown) of the second modification are shifted in the circumferential direction for each row, the plurality of magnetic pole blocks 21c are arranged around the flat outer peripheral surface of the back yoke (not shown). By sequentially arranging them in the direction, the magnetic pole blocks 21c in each row are arranged with being shifted from each other in the circumferential direction. In the example shown in FIG. 5, the rotor 2c also includes the above-described magnetic pole block holding members 6 (6-1, 6-2).

In the above description, as shown in FIGS. 1, 2 and 3, the cores 211a and 211c are formed such that the surfaces facing the stator 1a are rectangular or square (right-angled quadrilateral) in plan view. Although the

magnetic pole blocks

21a and 21c provided are used, a magnetic pole block provided with an iron core formed so that the surface facing the stator 1a is a parallelogram in plan view may be used. As a result, so-called cogging torque can be reduced.

FIG. 6 is a diagram for explaining the rotor of the third modification. More specifically, the rotor 2d in the third modification is formed so that the surface facing the stator 1a is parallelogram in plan view, instead of the iron core 211a, as shown in FIG. except that the back yoke (not shown) is provided in place of the back yoke 22a and has a flat outer peripheral surface formed to be a parallelogram in plan view according to the parallelogram of the core. , are constructed in the same manner as the rotor 2a described above. The plurality of magnetic pole blocks 21d in the rotor 2d of the third modified form are sequentially arranged in the circumferential direction on the flat outer peripheral surface of the back yoke (not shown) of the third modified form, which is parallelogram in plan view. is set.

In the above-described embodiment, the plurality of permanent magnets are a first permanent magnet arranged on the bottom surface of the iron core and a second permanent magnet arranged on a side surface of the iron core along the rotation axis direction. and a recess into which a part of one of the first permanent magnet and the second permanent magnet is fitted may be formed in the flat outer peripheral surface or the inner peripheral surface of the back yoke. In such a rotating electrical machine, the recesses can support the torque in the circumferential direction that the magnetic pole blocks (iron cores and magnets) receive when the rotor rotates.

FIG. 7 is a diagram for explaining rotors of fourth and fifth modifications. FIG. 7A is a cross-sectional view for explaining the rotor 2e in the fourth modification, and FIG. 7B is a cross-sectional view for explaining the rotor 2f in the fifth modification. In the example shown in FIG. 7, since the rotary electric machine Ma is of the inner rotor type, the recess is formed in the flat outer peripheral surface. When the rotary electric machine M is of an alter-rotor type, the recess is formed in the flat inner peripheral surface.

The rotor 2e in this fourth modification includes a plurality of magnetic pole blocks 21e and a back yoke 22e, as shown in FIG. 7A. Each of the plurality of magnetic pole blocks 21e includes an iron core 211e and first to third permanent magnets 212e to 214e similar to the iron core 211a and the first to third permanent magnets 212a to 214a in the magnetic pole block 21a (the third permanent magnet 214e are not shown in FIG. 7A). As shown in FIG. 7A, each of the plurality of magnetic pole blocks 21e is formed such that the bottom surface of the first permanent magnet 212e protrudes radially inward from the bottom surface of the second permanent magnet 213e. It is constructed in the same manner as block 21a. The back yoke 22a has recesses 221e for fitting respective portions of the first permanent magnets 212e of the plurality of magnetic pole blocks 21e on its flat outer peripheral surface, except that the back yoke 22a is configured similarly. Each recess 221e is formed so as to be recessed radially inward. The plurality of magnetic pole blocks 21e are sequentially arranged on the circumferentially flat outer peripheral surface of the back yoke 22e while fitting a portion of each of the first permanent magnets 212e into each of the recesses 221e. As a result, the rotor 2e in the fourth modification is formed in which the plurality of magnetic pole blocks 21e are arranged on the back yoke 22e.

In the above description, the entire bottom surface of the first permanent magnet 212e is fitted into the recess 221e of the back yoke 22e, but part of the bottom surface of the first permanent magnet 212e may be fitted into the recess of the back yoke 22e. . More specifically, the first permanent magnet 212e is provided with a convex portion protruding radially inward from the bottom surface, and a recess of the back yoke 22e is formed so that the convex portion is fitted. be.

The rotor 2f in this fifth modification includes a plurality of magnetic pole blocks 21f and a back yoke 22f, as shown in FIG. 7B. Each of the plurality of magnetic pole blocks 21f includes an iron core 211f and first to third permanent magnets 212f to 214f similar to the iron core 211a and the first to third permanent magnets 212a to 214a in the magnetic pole block 21a (third permanent magnet 214f). not shown in FIG. 7B). As shown in FIG. 7B, each of the plurality of magnetic pole blocks 21f is formed such that the bottom surface of the second permanent magnet 213f protrudes radially inward from the bottom surface of the first permanent magnet 212e. It is constructed in the same manner as block 21a. The back yoke 22a is similar to the back yoke 22a except that the flat outer peripheral surface of the back yoke 22f is formed with recesses 221f for fitting respective portions of the second permanent magnets 213f of the plurality of magnetic pole blocks 21f. is configured similarly. Each recess 221f is formed so as to be recessed radially inward. The plurality of magnetic pole blocks 21f are sequentially arranged on the circumferentially flat outer peripheral surface of the back yoke 22f while fitting a portion of each of the second permanent magnets 213f into each of the recesses 221f. As a result, a rotor 2f in the fifth modification is formed, in which a plurality of magnetic pole blocks 21f are arranged on the back yoke 22f.

In the above description, the entire bottom surface of the second permanent magnet 213f is fitted into the recess 221f of the back yoke 22f, but part of the bottom surface of the second permanent magnet 213f may be fitted into the recess of the back yoke 22f. . More specifically, the second permanent magnet 213f is provided with a projection projecting radially inward from the bottom surface, and a recess of the back yoke 22f is formed so that the projection is fitted. be.

Further, in the above-described embodiment, the rotary electric machine Ma is of the inner rotor type, but may be of the outer rotor type.

FIG. 8 is a diagram for explaining the configuration of a rotating electric machine in a modified form. 8A is a cross-sectional view showing the configuration of a rotating electrical machine in a modified form, FIG. 8B is a cross-sectional view showing the configuration of a rotor in the rotating electrical machine in the modified form, and FIG. 8C is a partially enlarged cross-sectional view thereof. is.

For example, as shown in FIG. 8A, the rotating electrical machine Mg in the modified form includes a stator 1g, a rotor 2g, and a support shaft 3g. It is a rotor type.

The stator 1g is a component that includes a plurality of coils 13g and generates a magnetic field for rotating the rotor 2g by the plurality of coils 13g. More specifically, for example, as shown in FIG. 8A, the stator 1g has an annular (cylindrical) yoke portion 11g and an outer peripheral surface of the yoke portion 11g which are arranged at regular intervals in the circumferential direction. A plurality of columnar tooth portions 12g protruding radially outward from the tooth portions 12g, and a plurality of coils 13g wound around the plurality of tooth portions 12g, respectively. The stator 1g is fixedly attached to a cylindrical support shaft 3g.

The rotor 2g has a plurality of magnetized magnetic pole blocks 21g, and magnetic interaction between the magnetic fields (rotating magnetic fields) generated by the stator 1g and the magnetic fields generated by the plurality of magnetic pole blocks 21g It is a rotating part. Note that the magnetic pole block 21g is omitted in FIG. 8A. More specifically, the rotor 2a includes, for example, a plurality of magnetic pole blocks 21g and a back yoke 22g, as shown in FIGS. 8B and 8C. Each of the plurality of magnetic pole blocks 21g includes an iron core 211g arranged to face the stator 1g, and a plurality of magnetic pole blocks 211g surrounding the iron core 211g by opening at least a surface facing the stator 1g. Three rectangular parallelepiped or cubic first to third

permanent magnets

212g, 213g, and 214g are provided. It is constructed in the same manner as the magnetic pole block 21a except that it is an inclined surface that narrows radially inward from the outside. Note that the third permanent magnet 214g is omitted in FIGS. 8B and 8C. Like the plurality of magnetic pole blocks 21a, the plurality of magnetic pole blocks 21g are arranged in a plurality of rows in the rotation axis direction (not shown). The back yoke 22g is a member having a polygonal outline shape on the outer peripheral surface or the inner peripheral surface in a cross section normal to the rotation axis direction. Here, since the rotary electric machine Mg is of the outer rotor type, the contour shape of the inner peripheral surface is polygonal. The plurality of magnetic pole blocks 21g are sequentially arranged in the circumferential direction on the flat inner peripheral surface formed by the polygonal shape.

The outer rotor type rotary electric machine Mg having such a configuration also exhibits the same effects as the inner rotor type rotary electric machine Ma described above.

This specification discloses various aspects of the technology as described above, of which the main technologies are summarized below.

A rotating electric machine according to one aspect includes a stator including a plurality of coils and a rotor including a plurality of magnetized magnetic pole blocks. Each of the plurality of magnetic pole blocks includes an iron core arranged to face the stator, and a plurality of permanent magnets surrounding the iron core with at least a surface facing the stator open. Each of the plurality of permanent magnets has a rectangular parallelepiped shape or a cubic shape. The rotor has a polygonal contour shape on the outer peripheral surface or the inner peripheral surface in a cross section normal to the rotation axis direction, and the plurality of magnetic pole blocks are flat in the circumferential direction on the outer peripheral surface or the inner peripheral surface. It further comprises a back yoke sequentially arranged on the peripheral surface. Preferably, in the rotating electric machine described above, the plurality of magnetic pole blocks sequentially arranged in the circumferential direction are arranged in a plurality of rows in the rotation axis direction, the iron core is a hexahedron, and the plurality of The permanent magnets include a first permanent magnet (R magnet) arranged on the bottom surface of the iron core, a second permanent magnet (th magnet) arranged on the side surface of the iron core along the rotation axis direction, and each row magnet. It includes a third permanent magnet (Z magnet) disposed therebetween. Preferably, the rotating electric machine described above further includes an annular holding member formed to extend in the circumferential direction and hold the plurality of magnetic pole blocks sequentially arranged in the circumferential direction from the outer peripheral side. Preferably, the annular holding member is a plurality arranged at intervals in the rotation axis direction. Preferably, in the rotating electric machine described above, a mesh-like holding member (lattice-like holding member ) is further provided. Preferably, the mesh-like holding member includes a first holding member formed to extend in the circumferential direction and a first holding member formed to extend along the axial direction and is spaced apart in the circumferential direction. and a plurality of second retaining members that are connected to each other. Preferably, the plurality of permanent magnets include permanent magnets arranged on a side surface of the iron core, and the plurality of first holding members are arranged such that at least one of the plurality of first holding members is a first holding member. The first holding member is arranged on a permanent magnet arranged on a side surface of the iron core along the circumferential direction, and the second holding member is arranged on a permanent magnet arranged on the side surface of the iron core along the rotation axis direction. placed on the magnet. Preferably, the first and second holding members are arranged on a surface of the iron core facing the stator. Preferably, the rotating electric machine is of an inner rotor type. Preferably, the rotating electric machine is of an outer rotor type.

In such a rotating electric machine, each of the plurality of magnets in the magnetic pole block has a rectangular parallelepiped shape or a cubic shape, so the machining accuracy required for manufacturing the magnets can be reduced. In the rotating electric machine, since the back yoke has a polygonal profile cross section, the magnets are arranged on the flat outer peripheral surface or the inner peripheral surface, so that the positioning of the magnets is facilitated, and the magnets and the back yoke are brought into close contact with each other. becomes possible. Therefore, it is possible to prevent deterioration in performance due to the occurrence of gaps.

In another aspect, in the rotating electric machine described above, the surface of the iron core facing the stator is a curved surface having a curvature in the circumferential direction.

In such a rotary electric machine, in the iron core that can be machined, the surface facing the stator is a curved surface having a curvature in the circumferential direction, so that the air gap between the rotor and the stator can be formed with high accuracy. .

In another aspect, in the rotating electric machine described above, when the permanent magnets of the plurality of permanent magnets that are arranged on the side surface of the iron core are arranged on the back yoke, the side surface of the iron core is: It is formed so as to come into surface contact with a permanent magnet arranged on the side surface of the iron core.

In such a rotating electric machine, even if the iron core and the permanent magnets are in contact with each other on the inclined surface, the iron core is machined so that the side surface of the iron core is the surface of the permanent magnets arranged on the side surface of the iron core. Since it forms so that it may contact|abut by , it can form precisely. Therefore, it is possible to ensure the necessary tolerance.

According to another aspect of the rotating electric machine described above, the magnetic pole block includes a first engaging portion formed on an outer surface, a second engaging portion engaged with the first engaging portion, The magnetic pole block holding member is further provided on the side surface of the back yoke with the second engaging portion engaged with the first engaging portion. Preferably, in the rotating electric machine described above, the first engaging portion is a concave portion or a convex portion, and the second engaging portion is a convex portion or a concave portion. Preferably, in the above-described rotating electric machine, the first engaging portion is a permanent magnet (a circumferential crossed permanent magnets).

When the rotor rotates, the magnetic pole blocks (iron cores and magnets) receive torque in the circumferential direction. Since the rotating electrical machine includes the magnetic pole block holding member, it is possible to prevent the magnetic pole blocks from being displaced.

In another aspect of the above-described rotary electric machine, the plurality of magnetic pole blocks sequentially arranged in the circumferential direction are arranged in a plurality of rows in the direction of the rotation axis, and the magnetic pole blocks in each row are aligned with each other. They are displaced in the circumferential direction.

In such a rotating electric machine, the magnetic pole blocks in each row are arranged with a displacement in the circumferential direction, so that so-called cogging torque can be reduced.

In another aspect, in the above-described rotating electric machine, the iron core is formed such that a surface of the iron core facing the stator is a parallelogram in plan view.

In such a rotating electrical machine, the iron core is formed to be the parallelogram, so the so-called cogging torque can be reduced.

According to another aspect, in the above-described rotating electric machines, the plurality of permanent magnets are a first permanent magnet arranged on a bottom surface of the iron core and a side surface of the iron core along the rotation axis direction. The flat outer peripheral surface or the inner peripheral surface of the back yoke is formed with a recess into which a part of one of the first permanent magnet and the second permanent magnet is fitted. It is

In such a rotating electrical machine, since the recesses are formed in the flat peripheral surface of the back yoke, the torque in the circumferential direction received by the magnetic pole blocks (iron cores and magnets) when the rotor rotates is absorbed by the recesses. can be supported by

This application is based on Japanese Patent Application No. 2021-137826 filed on August 26, 2021, the contents of which are included in this application.

Although the present invention has been adequately and fully described above through embodiments with reference to the drawings in order to express the present invention, modifications and/or improvements to the above-described embodiments can easily be made by those skilled in the art. It should be recognized that it is possible. Therefore, to the extent that modifications or improvements made by those skilled in the art do not depart from the scope of the claims set forth in the claims, such modifications or improvements do not fall within the scope of the claims. is interpreted to be subsumed by

According to the present invention, a rotating electrical machine that is used as at least one of a motor (electric motor) and a generator can be provided.

Claims

a stator comprising a plurality of coils;
a rotor comprising a plurality of magnetized magnetic pole blocks,
each of the plurality of magnetic pole blocks includes an iron core disposed facing the stator; and a plurality of permanent magnets surrounding the iron core with at least a surface facing the stator open,
each of the plurality of permanent magnets has a rectangular parallelepiped shape or a cubic shape;
The rotor has a polygonal contour shape on the outer peripheral surface or the inner peripheral surface in a cross section normal to the rotation axis direction, and the plurality of magnetic pole blocks are flat in the circumferential direction on the outer peripheral surface or the inner peripheral surface. Further comprising a back yoke sequentially arranged on the peripheral surface,
rotating electric machine.
The surface of the iron core facing the stator is a curved surface having a curvature in the circumferential direction,
The rotary electric machine according to claim 1.
When the permanent magnet arranged on the side surface of the iron core among the plurality of permanent magnets is arranged on the back yoke, the side surface of the iron core is the same as the permanent magnet arranged on the side surface of the iron core. formed to abut at
The rotary electric machine according to claim 1.
The magnetic pole block has a first engaging portion formed on the outer surface,
A magnetic pole block holding member provided with a second engaging portion that engages with the first engaging portion, and is disposed on a side surface of the back yoke with the second engaging portion engaged with the first engaging portion. further comprising
The rotary electric machine according to claim 1.
The plurality of magnetic pole blocks sequentially arranged in the circumferential direction are arranged in a plurality of rows in the rotation axis direction,
The magnetic pole blocks in each row are circumferentially displaced from each other,
The rotary electric machine according to claim 1.
The iron core is formed such that a surface of the iron core facing the stator is a parallelogram in plan view,
The rotary electric machine according to claim 1.
The plurality of permanent magnets include a first permanent magnet arranged on the bottom surface of the iron core and a second permanent magnet arranged on a side surface of the iron core along the rotation axis direction,
The flat outer peripheral surface or inner peripheral surface of the back yoke is formed with a recess into which a part of one of the first permanent magnet and the second permanent magnet is fitted.
The rotary electric machine according to claim 1.