JP6946120B2 - Axial gap type rotary electric machine - Google Patents

Description

The present invention relates to an axial gap type rotary electric machine, and more particularly to a rotor used in an axial gap type rotary electric machine.

Conventionally, an axial gap type rotary electric machine is known as a kind of permanent magnet synchronous motor. The axial gap type rotary electric machine includes a rotor having a plurality of permanent magnets and a base member supporting them, and a stator having a plurality of coils, and the rotor and the stator face each other with a gap in the axial direction of the rotor. It is arranged to do.

When the rotor rotates, centrifugal force acts on each of the plurality of permanent magnets. Therefore, the base member that supports a plurality of permanent magnets is required to withstand the load caused by the centrifugal force acting on the permanent magnets (the load caused by the permanent magnets being pressed outward in the radial direction by the action of the centrifugal force). Will be done.

In Patent Document 1 below, the above load is applied by individually surrounding each of the plurality of permanent magnets with a high-strength member formed by applying pressure while winding a sheet made of carbon fiber reinforced resin. The stress generated in the high-strength member is dispersed to ensure durability against the above load.

Japanese Unexamined Patent Publication No. 2006-174554

However, in Patent Document 1, the carbon fibers are short-circuited between the wound sheets due to the pressurization when forming the high-strength member, and the change of the magnetic flux passing through the inside of the high-strength member is hindered. Eddy currents flow more easily. As a result, energy efficiency decreases when driving a rotary electric machine, resin softens due to heat generation, resin deteriorates due to temperature changes, and magnet demagnetization occurs due to temperature rise. There is a risk of

An object of the present invention is an axial gap type rotary electric machine including a plurality of permanent magnets and a rotor having a base member supporting them, and the current flows in a direction that prevents a change in magnetic flux passing through a region in which the permanent magnets are arranged. It is an object of the present invention to provide an axial gap type rotary electric machine capable of suppressing the generation of eddy current in a base member.

In order to achieve the above object, the inventor of the present application considers among the base members supporting a plurality of permanent magnets in an axial gap type rotary electric machine provided with a plurality of permanent magnets and a rotor having a base member supporting them. We focused on the shape of the part (holding part) that surrounds the permanent magnet. Then, by dividing the portion of the holding portion located outside the permanent magnet in the radial direction (circumferential portion) in the circumferential direction of the rotor, the change in magnetic flux passing through the region where the permanent magnet is arranged is changed. We have come to the conclusion that it is possible to suppress the flow of eddy currents in the direction of obstruction. However, the circumferential portion divided in this way has lower durability against the load due to the centrifugal force acting on the permanent magnet than the undivided circumferential portion, so that the rotor is rotated at a high speed. It becomes difficult. The inventor of the present application has completed the present invention as a result of further studies based on such findings.

The present invention is an axial gap type rotary electric machine, comprising a rotor and a stator arranged so as to face the rotor in the axial direction of the rotor and rotating the rotor by an electromagnetic force, and the rotor includes a plurality of rotors. The permanent magnets, a base member formed of a non-magnetic material and supporting the plurality of permanent magnets in a state of being arranged in the rotation circumferential direction of the rotor, and the plurality of permanent magnets formed of a non-magnetic material as the rotor rotates. The base member is provided with a reinforcing member that suppresses deformation of the base member based on the load caused by the centrifugal force acting on each of the permanent magnets acting on the base member, and the base member is viewed from the axial direction. A plurality of holding portions for holding each of the plurality of permanent magnets so as to surround them are included, and each of the plurality of holding portions is located on one side of the permanent magnets in the circumferential direction of rotation and in the radial direction of rotation of the rotor. A first radial portion that extends to one side of the permanent magnet in the circumferential direction of rotation and is located on the other side of the permanent magnet in the circumferential direction of rotation and extends in the radial direction of rotation. A second radial portion that constrains the movement of the permanent magnet to the other side in the circumferential direction of rotation, and a permanent magnet that is located outside the permanent magnet in the radial direction of rotation and extends in the circumferential direction of rotation. The outer peripheral direction portion includes the outer peripheral direction portion that restrains the outward movement in the rotational radial direction, and the outer circumferential direction portion extends from the first radial direction portion toward the other side in the rotational circumferential direction. A direction portion and a second outer circumferential portion extending from the second radial direction portion toward one side in the rotation circumferential direction are included, and between the first outer circumferential direction portion and the second outer circumferential direction portion. A gap is formed between the tip of the first outer peripheral direction portion and the tip of the second outer peripheral direction portion so as to cut off the energization in the above, and the reinforcing member is formed in the first outer peripheral direction. Deformation in which the tips of the portion and the second outer peripheral direction portion are displaced outward in the rotational radial direction is suppressed.

In the axial gap type rotary electric machine, since the eddy current does not flow between the first outer peripheral direction portion and the second outer circumferential direction portion, the change of the magnetic flux passing through the region where the permanent magnet is arranged is hindered. It is possible to suppress the flow of eddy currents.

Further, since the durability against the load caused by the centrifugal force acting on the permanent magnet with the rotation of the rotor is improved, the rotation speed of the rotor can be increased.

In the axial gap type rotary electric machine, preferably, each of the plurality of holding portions is further located inside the permanent magnet in the turning radius direction, and the first radial direction portion and the second radial direction portion. The reinforcing member includes a plurality of connecting members individually attached to each of the plurality of holding portions, and each of the plurality of connecting members includes the first outer peripheral portion. A first connecting member that connects the first outer peripheral direction portion and the inner peripheral direction portion and the second outer side so as to suppress deformation such that the tip of the directional portion is displaced outward in the radius of gyration direction. A second connecting member that connects the second outer peripheral direction portion and the inner peripheral direction portion is included so as to suppress deformation such that the tip of the circumferential direction portion is displaced outward in the radius of gyration direction.

In this case, the deformation of the first outer peripheral direction portion and the second outer peripheral direction portion can be suppressed individually.

In the axial gap type rotary electric machine, preferably, the first connecting member and the second connecting member are arranged so as to cross the permanent magnet when viewed from the axial direction, and come into contact with the permanent magnet in the axial direction. By doing so, the movement of the permanent magnet in the axial direction is restrained.

In this case, the axial movement of the permanent magnet is restrained by using the first connecting member that suppresses the deformation of the first outer peripheral direction portion and the second connecting member that suppresses the deformation of the second outer peripheral direction portion. be able to.

In the axial gap type rotary electric machine, preferably, the end portion of the first connecting member attached to the inner peripheral direction portion is integrated with the end portion of the second connecting member attached to the inner circumferential direction portion. It is connected to.

In this case, since one end of each of the first connecting member and the second connecting member can be attached to the inner peripheral direction portion at the same time, the attachment work of the connecting member becomes easy.

In the axial gap type rotary electric machine, preferably, at least a part of the first connecting member is formed in a first groove formed over the first outer peripheral direction portion, the permanent magnet, and the inner peripheral direction portion. At least a part of the second connecting member is located in the second groove formed over the second outer peripheral direction portion, the permanent magnet and the inner peripheral direction portion.

In this case, since the height of each of the first connecting member and the second connecting member protruding from the surfaces of the permanent magnet and the holding portion can be reduced, the air resistance of the rotor can be reduced.

In the axial gap type rotary electric machine, preferably, the reinforcing member surrounds the base member when viewed from the axial direction, and the first outer peripheral direction portion and the second outer side of each of the plurality of holding portions have. Includes a protective tube that contacts the circumferential portion from the outside in the radial direction of rotation.

In this case, it is possible to suppress the deformation of the first outer peripheral direction portion and the second outer circumferential direction portion of each of the plurality of holding portions with a single member.

In the axial gap type rotary electric machine, preferably, the first radial direction portion and the second radial direction portion are provided by a single common radial portion existing between the two permanent magnets adjacent to each other in the rotational circumferential direction. And are configured.

In this case, a plurality of holding portions can be handled together.

According to the axial gap type rotary electric machine of the present invention, it is possible to suppress the generation of an eddy current flowing in a direction that hinders the change of the magnetic flux passing through the region where the permanent magnet is arranged in the base member.

It is sectional drawing which shows the axial gap type rotary electric machine by 1st Embodiment of this invention. It is an exploded perspective view of the axial gap type rotary electric machine shown in FIG. It is a top view which shows the rotor of the axial gap type rotary electric machine shown in FIG. It is a perspective view of the rotor cut by the IV-IV cutting line in FIG. It is a perspective view of the rotor cut by the VV cutting line in FIG. It is a perspective view which shows the rotor provided in the axial gap type rotary electric machine according to the 2nd Embodiment of this invention. It is a perspective view which shows the reinforcing member adopted in the application example 1 of the 2nd Embodiment of this invention. It is a perspective view which shows the mounting state of the reinforcing member in the application example 2 of the 2nd Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The axial gap type DC brushless motor 10 (hereinafter, simply referred to as the motor 10) as the axial gap type rotary electric machine according to the first embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a cross-sectional view of the motor 10. FIG. 2 is an exploded perspective view of the motor 10.

In the following description, the axial direction, the radial direction, and the circumferential direction refer to the axial direction, the radial direction, and the circumferential direction of the rotor 30 included in the motor 10. That is, the radial direction corresponds to the radial direction of rotation of the rotor 30, and the circumferential direction corresponds to the circumferential direction of rotation of the rotor 30.

The motor 10 includes a rotor shaft 20, a rotor 30 fixed to the rotor shaft 20, a stator 40 that applies a rotational driving force to the rotor 30, and a casing 50 that houses the rotor 30 and the stator 40.

The casing 50 includes a drum 52, a first end wall 54, and a second end wall 56. The drum 52 has a structure in which a plurality of (two in the present embodiment) tubular walls 521 arranged side by side in the axial direction are connected to each other by a plurality of columns 522 arranged side by side in the circumferential direction. It surrounds the rotor 12 and the stator 40. In FIG. 2, only one cylinder wall 521 is shown. The first end wall 54 is attached to one end of the drum 52 in the axial direction to close the opening on the one end side. The second end wall 56 is attached to the other end of the drum 52 in the axial direction to close the opening on the other end side. A rotor shaft 20 is inserted into a hole formed in the central portion of each of the first end wall 54 and the second end wall 56.

A cooling flow path (not shown) is arranged on the outer surface of each of the first end wall 54 and the second end wall 56. A cooling fluid (for example, cooling water) for removing heat mainly generated from the stator 40 flows through the cooling flow path. The cooling flow path may be omitted, or may be formed inside each of the first end wall 54 and the second end wall 56.

The rotor shaft 20 is fixed to the rotor 30 and extends in the axial direction of the rotor 30. The rotor shaft 20 is rotatably supported by the first end wall 54 and the second end wall 56 via a bearing 60. The rotor shaft 20 rotates integrally with the rotor 30 by the torque applied to the rotor 30.

As shown in FIG. 2, the rotor 30 includes a disk-shaped base member 32, a plurality of permanent magnets 34 held by the base member 32, and a protective tube 36 as a reinforcing member. The details of the rotor 30 will be described later.

The stator 40 is arranged so as to face the rotor 30 in the axial direction, and rotates the rotor 30 by an electromagnetic force. In this embodiment, the stator 40 is arranged on both sides of the rotor 30 in the axial direction. Specifically, the stator 40 has a first stator element arranged between the rotor 30 and the first end wall 54 and a second stator element arranged between the rotor 30 and the second end wall 56. include. The first stator element includes a first back yoke 401 and a plurality of first electromagnet units 402. The second stator element includes a second back yoke 403 and a plurality of second electromagnet units 404.

The first back yoke 401 is an iron core (that is, a joint iron) for coupling a plurality of first electromagnet units 402 with magnetic flux. The second back yoke 403 is an iron core (that is, a joint iron) for connecting a plurality of second electromagnet units 404 with magnetic flux. Each of the plurality of first electromagnet units 402 and the plurality of second electromagnet units 404 is supplied with an electric current to rotate the rotor 30 in which the plurality of permanent magnets 34 are arranged by electromagnetic force. The plurality of first electromagnet units 402 and the plurality of second electromagnet units 404 each have a stator core 405 and a stator coil 406 composed of an insulated wire wound around the stator core 405. A direct current flowing through the stator coil 406 forms a magnetic flux that penetrates the stator core 405 in the axial direction. By periodically reversing the direction of the direct current flowing through the stator coil 406, an electromagnetic force that rotates the rotor 30 is generated.

The rotor 30 will be described with reference to FIGS. 3, 4, and 5. FIG. 3 is a plan view showing the rotor. FIG. 4 is a perspective view showing a rotor 30 cut along the IV-IV cutting line in FIG. FIG. 5 is a perspective view showing a rotor 30 cut along the VV cutting line in FIG.

The base member 32 supports a plurality of permanent magnets 34 in a state of being arranged in the circumferential direction. The base member 32 is fixed to the axially central portion of the rotor shaft 20 so as to rotate integrally with the rotor shaft 20.

The base member 32 includes a first base member 32A and a second base member 32B. The first base member 32A and the second base member 32B are each made of a non-magnetic material. The first base member 32A and the second base member 32B are preferably made of a material having a large specific resistance. The first base member 32A and the second base member 32B are made of, for example, stainless steel.

In the present embodiment, the first base member 32A and the second base member 32B are formed in the same shape and size as each other. Therefore, in the following, the details of only the first base member 32A will be described, and the detailed description of the second base member 32B will be omitted.

The first base member 32A includes a central portion 321 and a plurality of partition portions 322. These will be described below.

A rotor shaft 20 is attached to the central portion 321. Specifically, a hole 3212 is formed in the central portion 321 through the first base member 32A in the thickness direction (axial direction of the rotor 30). The rotor shaft 20 is inserted through the hole 3212. In the present embodiment, as shown in FIG. 1, the rotor shaft 20 is inserted into the hole 3212 formed in the central portion 321 of each of the first base member 32A and the second base member 32B, and the rotor shaft 20 is inserted. An annular mounting piece 201 provided at the central portion in the axial direction of the first base member 32A is fixed to the central portion 321 of the first base member 32A by a plurality of bolts 331 and nuts 332. At this time, the first base member 32A and the second base member 32B are fixed by a plurality of bolts 331 and nuts 332. The first base member 32A and the second base member 32B may be adhered with an adhesive.

The plurality of partition portions 322 are formed so as to partition the plurality of permanent magnets 34 in the circumferential direction. Each of the plurality of partition portions 322 is connected to the central portion 321. The plurality of partition portions 322 are arranged at equal intervals in the circumferential direction.

Each of the plurality of partition portions 322 includes a radial portion 323, a circumferential portion 324, and a circumferential portion 325. These will be described below.

The radial portion 323 extends radially outward from the central portion 321. The first base member 32A and the second base member 32B are fixed by a pin 333 and a C ring (not shown) inserted into a hole formed in the tip portion of the radial portion 323. The radial portion 323 is in contact with the permanent magnet 34 located adjacent to the permanent magnet 34 in the circumferential direction, and restrains the movement of the permanent magnet 34 in the circumferential direction.

The circumferential portion 324 is formed so as to extend from the tip end portion (diameter outer end portion) of the radial portion 323 toward one side in the circumferential direction. The tip of the circumferential portion 324 is a free end. The circumferential portion 324 is located radially outside the permanent magnet 34 located on one side of the plurality of permanent magnets 34 in the circumferential direction next to the radial portion 323. The circumferential portion 324 is in contact with the permanent magnet 34 and restrains the movement of the permanent magnet 34 outward in the radial direction.

The width of the circumferential portion 324 (the length in the direction perpendicular to the direction in which the circumferential portion 324 extends when viewed from the axial direction) is the width of the radial portion 323 (the direction in which the radial portion 323 extends when viewed from the axial direction). Greater than (length in the direction perpendicular to). The length of the circumferential portion 324 (the length in the direction in which the circumferential portion 324 extends) is shorter than the length of the radial portion 323 (the length in the direction in which the radial portion 323 extends).

The circumferential portion 325 is formed so as to extend from the tip end portion (diametrically outer end portion) of the radial direction portion 323 toward the other side in the circumferential direction. The tip of the circumferential portion 325 is a free end. The circumferential portion 325 is located radially outside the permanent magnet 34 located on the other side of the circumferential direction and next to the radial portion 323 among the plurality of permanent magnets 34. The circumferential portion 325 is in contact with the permanent magnet 34 and restrains the movement of the permanent magnet 34 outward in the radial direction.

The width of the circumferential portion 325 (the length in the direction perpendicular to the direction in which the circumferential portion 325 extends when viewed from the axial direction) is the width of the radial portion 323 (the direction in which the radial portion 323 extends when viewed from the axial direction). Greater than (length in the direction perpendicular to). The length of the circumferential portion 325 (the length in the direction in which the circumferential portion 325 extends) is shorter than the length of the radial portion 323 (the length in the direction in which the radial portion 323 extends).

Of the two partition portions 322 adjacent to each other in the circumferential direction in the plurality of partition portions 322, the tip of the circumferential portion 325 formed in the partition portion 322 located on one side in the circumferential direction is the two partitions adjacent to each other in the circumferential direction. It faces the tip of the circumferential portion 324 formed in the partition portion 322 located on the other side in the circumferential direction of the portion 322 in the circumferential direction. That is, a gap S1 is formed between the tip of the circumferential portion 324 and the tip of the circumferential portion 325. Here, the tip of the circumferential portion 324 is parallel to the tip of the circumferential portion 325. Therefore, the size of the gap S1 (that is, the distance from the tip of the circumferential portion 324 to the tip of the circumferential portion 325) is constant. The size of the gap S1 is sufficiently smaller than the width of each of the radial portion 323, the circumferential portion 324, and the circumferential portion 325.

In the present embodiment, the radial portion 323 located on one side of the permanent magnet 34 in the circumferential direction corresponds to the first radial portion, and the radial portion 323 located on the other side of the permanent magnet 34 in the circumferential direction is the first. Corresponds to the 2 radial direction part. In the present embodiment, the first radial portion and the second radial portion are composed of a radial portion 323 as a single common radial portion existing between two permanent magnets 34 adjacent to each other in the circumferential direction. ing.

In the present embodiment, the circumferential portion 325 extending from the radial portion 323 toward the other circumferential direction corresponds to the first outer circumferential portion, and the circumferential portion 324 extending from the radial portion 323 toward one circumferential direction corresponds to the first outer circumferential portion. It corresponds to the second outer peripheral direction portion. In the present embodiment, the circumferential portion is realized by including two circumferential portions 325 and 324.

In the present embodiment, the portion of the central portion 321 connecting the two radial portions 323 adjacent to each other in the circumferential direction corresponds to the inner circumferential portion. The portion (inner circumferential direction portion) is in contact with the permanent magnet 34.

In the present embodiment, from two radial portions 323 adjacent to each other in the circumferential direction, a circumferential portion 325 extending from the radial portion 323 as the first radial portion, and a radial portion 323 as the second radial portion. A holding portion that holds the permanent magnet 34 so as to surround it is realized by the extending circumferential portion 324 and the portion of the central portion 321 that connects two radial portions 323 that are adjacent to each other in the circumferential direction. In the present embodiment, a plurality of holding portions are integrally provided.

The plurality of permanent magnets 34 have, for example, a flat plate shape. The plurality of permanent magnets 34 are arranged so that the north and south poles are alternately arranged when viewed from the axial direction. The plurality of permanent magnets 34 are sandwiched between the first base member 32A and the second base member 32B. The plurality of permanent magnets 34 are in contact with the first base member 32A and the second base member 32B. The surface that each of the plurality of permanent magnets 34 comes into contact with is an inclined surface that spreads in a direction that is inclined with respect to the axial direction.

The protective tube 36 suppresses deformation of the base member 32 due to centrifugal force acting on each of the plurality of permanent magnets 34 as the rotor 30 rotates. The protective tube 36 surrounds the base member 32 when viewed from the axial direction, and has a tubular shape as a whole. The protective tube 36 is in contact with the circumferential portion 324 and the circumferential portion 325 of each of the plurality of partition portions 322 from the outside in the radial direction. Therefore, the protective tube 36 suppresses deformation such that the free ends of the circumferential portion 324 and the circumferential portion 325 are displaced outward in the radial direction. The protective tube 36 is formed, for example, by pressurizing a tape made of carbon fiber reinforced resin in a state of being wound in the circumferential direction.

In the motor 10, since the gap S1 is formed between the tip of the circumferential portion 324 and the tip of the circumferential portion 325, the eddy current is in a direction that hinders the change of the magnetic flux passing through the region where the permanent magnet 34 is arranged. It is possible to suppress the flow of current.

In the motor 10, since the protective tube 36 suppresses the deformation of the circumferential portion 324 and the circumferential portion 325, the durability against the load caused by the centrifugal force acting on the permanent magnet 34 with the rotation of the rotor 30 is improved. do. Therefore, the rotation speed of the rotor 30 can be increased.

In the motor 10, the protective tube 36 covers the outer peripheral surface of the base member 32. Therefore, it is possible to suppress the deformation of the circumferential portion 324 and the circumferential portion 325 of each of the plurality of partition portions 322 with a single member.

[Second Embodiment]
The reinforcing member is not limited to the protective tube 36 described in the first embodiment.

A second embodiment of the present invention will be described with reference to FIG. FIG. 6 is a perspective view showing the rotor 30A adopted in the present embodiment.

The rotor 30A does not include the protective tube 36 as compared with the rotor 30. Instead, it includes a plurality of connecting members 38 as reinforcing members.

The plurality of connecting members 38 suppress deformation such that the tips of the circumferential portion 324 and the circumferential portion 325 are displaced outward in the radial direction, respectively.

Each of the plurality of connecting members 38 is made of a non-magnetic material. It is preferable that the plurality of connecting members 38 are each made of a material having a large specific resistance. The plurality of connecting members 38 are made of, for example, stainless steel. The plurality of connecting members 38 are arranged on both sides of the base member 32 in the thickness direction (axial direction of the rotor 30). The plurality of connecting members 38 include a first connecting member 381 and a second connecting member 382, respectively.

The first connecting member 381 connects the circumferential portion 324 and the central portion 321. The radial outer end of the first connecting member 381 (the end on the circumferential portion 324 side) is fixed to the circumferential center of the circumferential portion 324. The radial inner end of the first connecting member 381 (the end on the central portion 321 side) is located at the circumferential center of the portion of the central portion 321 located between two radially adjacent radial portions 323. It is fixed. As the fixing means for fixing the first connecting member 381 to the circumferential portion 324 and the central portion 321, for example, a pin and a C ring can be adopted. The first base member 32A and the second base member 32B are fixed by the fixing means.

The first connecting member 381 extends parallel to the radial portion 322 provided with the circumferential portion 324 to which the first connecting member 381 is fixed when viewed from the axial direction. The first connecting member 381 overlaps the permanent magnet 34 when viewed from the axial direction. The width of the first connecting member 381 (the length in the direction perpendicular to the direction in which the first connecting member 381 extends when viewed from the axial direction) is the width of the radial portion 322 (the radial portion 322 when viewed from the axial direction). It is almost the same as the length in the direction perpendicular to the extending direction).

The second connecting member 382 connects the circumferential portion 325 and the central portion 321. The radial outer end of the second connecting member 382 (the end on the circumferential 325 side) is fixed to the circumferential center of the circumferential portion 325. The radial inner end of the second connecting member 382 (the end on the central portion 321 side) is located at the circumferential center of the portion of the central portion 321 located between two radially adjacent radial portions 323. It is fixed. As the fixing means for fixing the second connecting member 382 to the circumferential portion 325 and the central portion 321, for example, a pin and a C ring can be adopted. The first base member 32A and the second base member 32B are fixed by the fixing means.

The second connecting member 382 extends parallel to the radial portion 322 provided with the circumferential portion 325 to which the second connecting member 382 is fixed when viewed from the axial direction. The second connecting member 382 overlaps the permanent magnet 34 when viewed from the axial direction. The width of the second connecting member 382 (the length in the direction perpendicular to the direction in which the second connecting member 382 extends when viewed from the axial direction) is the width of the radial portion 322 (the radial portion 322 when viewed from the axial direction). It is almost the same as the length in the direction perpendicular to the extending direction).

The end portion of the second connecting member 382 on the central portion 321 side is integrally formed with the end portion of the first connecting member 381 on the central portion 321 side. That is, the second connecting member 382 is fixed to the central portion 321 at the same position as the first connecting member.

The end portion of the second connecting member 382 on the central portion 321 side is connected to the end portion of the first connecting member 381 on the central portion 321 side at a position overlapping the central portion 321 when viewed from the axial direction.

In the rotor 30A, since the gap S1 is formed between the tip of the circumferential portion 324 and the tip of the circumferential portion 325, the same effect as that of the first embodiment can be obtained.

In the rotor 30A, since each of the plurality of connecting members 38 suppresses the displacement of the circumferential direction 324 and the circumferential direction portion 325, the load due to the centrifugal force acting on the permanent magnet 34 with the rotation of the rotor 30A is applied. Durability can be improved.

In the rotor 30A, the connecting member 38 overlaps the permanent magnet 34 when viewed from the axial direction. Therefore, while suppressing the deformation of each of the circumferential portion 324 and the circumferential portion 325, the permanent magnet 34 moves in the axial direction (movement based on the action of electromagnetic force generated by energization of the stator coil 406). Can be restrained.

In particular, in the rotor 30A, since the connecting members 38 are arranged on both sides in the axial direction, the movement of the permanent magnet 34 in both sides in the axial direction can be restrained.

In addition, in the rotor 30A, the first connecting member 381 is connected to the second connecting member 382 at a position overlapping the central portion 321 when viewed from the axial direction. Therefore, it is possible to secure a region where the connecting member 38 comes into contact with the permanent magnet 34. As a result, it becomes easy to restrain the movement of the permanent magnet 34 in the axial direction.

In the rotor 30A, since the ends of the first connecting member 381 and the second connecting member 382 on the central portion 321 side are integrally formed, each of the plurality of connecting members 38 is attached to the central portion 321. Work becomes easier.

The position where the first connecting member 381 is attached to the circumferential portion 324 is preferably close to the base end of the circumferential portion 324 (that is, the connection end to the radial portion 323). In this case, in the region where the permanent magnet 34 is arranged, the region on the other side in the circumferential direction from the first connecting member 381 (that is, the radial direction in which the first connecting member 381 is connected to the fixed circumferential portion 324). The area on the portion 323 side) can be reduced. Therefore, it is possible to make it less susceptible to the influence when the magnetic flux passing through the region changes. As a result, it is possible to suppress the flow of eddy current between the circumferential portion 324 and the central portion 321 via the first connecting member 381.

The position where the second connecting member 382 is attached to the circumferential portion 325 is preferably close to the base end of the circumferential portion 325 (that is, the connection end to the radial portion 323). In this case, in the region where the permanent magnet 34 is arranged, the region on one side in the circumferential direction from the second connecting member 382 (that is, the radial direction in which the second connecting member 382 is connected to the fixed circumferential portion 325). The area on the portion 323 side) can be reduced. Therefore, it is possible to make it less susceptible to the influence when the magnetic flux passing through the region changes. As a result, it is possible to suppress the flow of eddy current between the circumferential portion 325 and the central portion 321 via the second connecting member 382.

[Application Example 1 of the Second Embodiment]
The first connecting member 381 and the second connecting member 382 may not be integrally formed.

An application example 1 of the second embodiment of the present invention will be described with reference to FIG. 7. FIG. 7 is a perspective view showing a connecting member 38A adopted in this application example.

In this application example, a plurality of connecting members 38A are provided instead of the plurality of connecting members 38. The connecting member 38A is different from the connecting member 38 in that the end portion of the first connecting member 381 on the central portion 321 side is not integrally formed with the end portion of the second connecting member 382 on the central portion 321 side. .. That is, in the connecting member 38A, the first connecting member 381 and the second connecting member 382 are attached to the central portion 321 at different positions.

In the example shown in FIG. 7, the first connecting member 381 extends in parallel with the second connecting member 382, but the first connecting member 381 does not need to extend in parallel with the second connecting member 382.

In this application example as well, as in the second embodiment, the first connecting member 381 connects the circumferential portion 324 and the central portion 321, and the second connecting member 382 connects the circumferential portion 325 and the central portion 321. Is connected, the same effect as that of the second embodiment can be obtained.

[Application Example 2 of the Second Embodiment]
The connecting member 38 may be arranged so as to be embedded in the permanent magnet 34 and the base member 32.

An application example 2 of the second embodiment of the present invention will be described with reference to FIG. FIG. 8 is a perspective view showing a mounting state of the connecting member 38 in this application example. At least a part of the first connecting member 381 is located in the first groove 391 formed over the circumferential portion 324, the permanent magnet 34 and the central portion 321. At least a part of the second connecting member 382 is located in the second groove 392 formed over the circumferential portion 325, the permanent magnet 34 and the central portion 321.

In this application example as well, as in the second embodiment, the first connecting member 381 connects the circumferential portion 324 and the central portion 321, and the second connecting member 382 connects the circumferential portion 325 and the central portion 321. Is connected, the same effect as that of the second embodiment can be obtained.

In this application example, the height at which the surfaces of the first connecting member 381 and the second connecting member 382 project from the surfaces of the base member 32 and the permanent magnet 34 can be reduced, so that the rotor rotates. The air resistance at the time can be reduced.

Although the embodiments of the present invention have been described in detail above, these are merely examples, and the present invention is not to be interpreted in a limited manner by the above description of the embodiments.

In the above embodiment, the axial gap type DC brushless motor has been described as an example of the axial gap type rotary electric machine, but the axial gap type rotary electric machine may be another type of motor or generator.

The first connecting member and the second connecting member of the present invention may be in the form of wires, for example.

In the above embodiment, the plurality of holding portions are integrally provided, but the plurality of holding portions may be provided separately.

In the second embodiment, the rotor 30A may further include a protective tube 36. In this case, the deformation of the circumferential portion 324 and the circumferential portion 325 can be further suppressed.

In the first and second embodiments, the gap S1 may be filled with a synthetic resin material. In this case, it is possible to prevent the circumferential portion 324 and the circumferential portion 325 from coming into contact with each other due to the temperature change.

10 Motor 30 Rotor 32 Base member 32A 1st base member 32B 2nd base member 321 Central part 322 Partition part 323 Radial part 324 Circumferential part 325 Permanent magnet 36 Protective tube (reinforcing member)
38 Connecting member 40 Stator

Claims (5)

Axial gap type rotary electric machine
With the rotor
A stator, which is arranged so as to face the rotor in the axial direction of the rotor and rotates the rotor by an electromagnetic force , is provided.
The rotor is formed of a plurality of permanent magnets and a non-magnetic material, and is formed of a base member that supports the plurality of permanent magnets in a state of being arranged in the rotational circumferential direction of the rotor and a non-magnetic material. and a reinforcing member to suppress the deformation of the base member the load caused by the centrifugal force based on acting on the base member which acts on each of the plurality of permanent magnets with the rotation,
The base member includes a plurality of holding portions that are held so as to surround each of the plurality of permanent magnets when viewed from the axial direction.
Each of the plurality of holding portions is located on one side of the permanent magnet in the circumferential direction of rotation, extends in the radial direction of rotation of the rotor, and restrains the movement of the permanent magnet to one side in the circumferential direction of rotation. A second radial portion that is located on the other side of the permanent magnet in the circumferential direction of rotation and extends in the radial direction of rotation to restrain the movement of the permanent magnet to the other side in the circumferential direction of rotation. A radial portion, an outer circumferential portion located outside the permanent magnet in the radial direction of rotation, extending in the circumferential direction of rotation, and restraining the outward movement of the permanent magnet in the radial direction of rotation, and the above. It is located inside the permanent magnet in the radial direction of rotation, and includes an inner circumferential portion that connects the first radial direction portion and the second radial direction portion.
The outer peripheral direction portion includes a first outer peripheral direction portion extending from the first radial direction portion toward the other side in the rotation circumferential direction, and the second radial direction portion toward one side in the rotation circumferential direction. includes a second outer circumferential portion extending a,
Between the tip of the first outer peripheral direction portion and the tip of the second outer peripheral direction portion so as to cut off the energization between the first outer peripheral direction portion and the second outer circumferential direction portion. A gap is formed,
The reinforcing member suppresses deformation such that the tips of the first outer peripheral direction portion and the second outer peripheral direction portion are displaced outward in the rotational radial direction, and the plurality of holding portions. Includes multiple connecting members that are individually attached to each of
Each of the plurality of connecting members has the first outer peripheral direction portion and the inner peripheral direction portion so as to suppress deformation such that the tip of the first outer peripheral direction portion is displaced outward in the turning radius direction. The second outer peripheral direction portion and the inner peripheral direction so as to suppress deformation such that the tip of the first connecting member connecting the two outer peripheral directions and the tip of the second outer peripheral direction portion is displaced outward in the turning radius direction. Includes a second connecting member that connects the parts
An axial gap type rotary electric machine in which an end portion of the first connecting member attached to the inner peripheral direction portion is integrally connected to an end portion of the second connecting member attached to the inner circumferential direction portion. The axial gap type rotary electric machine according to claim 1.
The first connecting member and the second connecting member are arranged so as to cross the permanent magnet when viewed from the axial direction, and come into contact with the permanent magnet in the axial direction to bring the permanent magnet into the axial direction. Axial gap type rotating electric machine that restrains the movement to. The axial gap type rotary electric machine according to claim 1 or 2.
At least a part of the first connecting member is located in the first groove formed over the first outer peripheral direction portion, the permanent magnet, and the inner peripheral direction portion.
An axial gap type rotary electric machine in which at least a part of the second connecting member is located in a second groove formed over the second outer peripheral direction portion, the permanent magnet, and the inner circumferential direction portion. The axial gap type rotary electric machine according to any one of claims 1 to 3.
The reinforcing member surrounds the base member when viewed from the axial direction, and is in the radial direction of rotation with respect to the first outer peripheral direction portion and the second outer circumferential direction portion of each of the plurality of holding portions. Axial gap type rotary electric machine including a protective tube that contacts from the outside. The axial gap type rotary electric machine according to any one of claims 1 to 4.
Axial gap type rotation in which the first radial portion and the second radial portion are formed by a single common radial portion existing between two permanent magnets adjacent to each other in the circumferential direction of rotation. Electric.

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