A rotor

Abstract

This disclosure provides a rotor (100) comprising: a fixed rotor (20) including a cylindrical first rotor core (21) and a plurality of first magnets (22) arranged circumferentially thereon, and fixed to a rotating shaft (10); a rotating rotor (30a) including a cylindrical second rotor core (31) and a plurality of second magnets (32) arranged circumferentially thereon, and disposed adjacent to the fixed rotor in the axial direction of the rotating shaft, and mounted on the rotating shaft in a manner rotatable relative to the fixed rotor; and a spacer portion (40a) disposed at a position inside the inner circumferential surface (34) of the second rotor core, and rotating integrally with the rotating shaft, wherein the rotating rotor has a first protrusion (35) on the inner circumferential surface of the second rotor core, and the spacer portion has a second protrusion (45), which abuts against the first protrusion when the rotating rotor rotates relative to the fixed rotor (20) and the first magnets and second magnets face each other with the same polarity. This rotor can reduce the inner diameter of the rotating rotor.

Description

Technical Field

[0001] This disclosure relates to a rotor. Background Technology

[0002] A rotor for a rotary electric motor is known, comprising: a rotating shaft; a fixed rotor fixed to the rotating shaft; and a rotating rotor adjacent to the fixed rotor axially along the rotating shaft and configured to rotate relative to the fixed rotor. The rotor described in Japanese Patent Application Publication No. 2024-068500 has a rotating shaft, a rotation locking shaft, a hub, and a transmission plate arranged inside a cylindrical rotating rotor. In this structure, the inner diameter of the rotating rotor becomes larger, thus narrowing the magnetic circuit and reducing the performance of the rotary electric motor. Utility Model Content

[0003] This disclosure aims to provide a rotor with a reduced inner diameter of the rotating rotor to improve the performance of a rotating electric motor.

[0004] This disclosure discloses a rotor comprising: a rotating shaft; a fixed rotor including a cylindrical first rotor core and a plurality of first magnets arranged circumferentially on the first rotor core, and fixed to the rotating shaft; a rotating rotor including a cylindrical second rotor core and a plurality of second magnets arranged circumferentially on the second rotor core, and disposed adjacent to the fixed rotor in the axial direction of the rotating shaft and mounted on the rotating shaft in a manner rotatable relative to the fixed rotor; and a spacer portion disposed at a position inside the inner circumferential surface of the second rotor core and rotating integrally with the rotating shaft, the rotating rotor having a first protrusion on the inner circumferential surface of the second rotor core, the spacer portion having a second protrusion, the second protrusion abutting against the first protrusion when the rotating rotor rotates relative to the fixed rotor and the plurality of first magnets and the plurality of second magnets are opposite each other with the same polarity.

[0005] The rotor disclosed herein can reduce the inner diameter of a rotating rotor. Attached Figure Description

[0006] Figure 1A This is a cross-sectional schematic diagram of the rotor provided in the embodiment.

[0007] Figure 1B From Figure 1A A top view of the stationary rotor as seen in the -X direction.

[0008] Figure 1C From Figure 1A A top-view schematic diagram of the rotating rotor as viewed from the +X direction.

[0009] Figure 2AThe diagram shows a top view of the rotation of the rotating rotor relative to the spacer in the embodiment, wherein the first magnet and the second magnet have the same pole facing each other.

[0010] Figure 2B The diagram shows a top view of the rotation of the rotating rotor relative to the spacer in the embodiment, wherein the first magnet and the second magnet have opposite poles facing each other.

[0011] Figure 3 This is a top view schematic diagram of the rotating rotor in a modified embodiment. Detailed Implementation

[0012] The embodiments of the invention described below are illustrated with reference to the accompanying drawings. Example

[0013] Figure 1A This is a cross-sectional schematic diagram of the rotor 100 provided in the embodiment. Figure 1B From Figure 1A A top view of the fixed rotor 20 as seen in the -X direction. Figure 1C From Figure 1A A top view of the rotating rotor 30a viewed in the +X direction. The axis of rotation 10 is taken as the X-axis. The directions orthogonal to the X-axis and to each other are taken as the Y-axis and Z-axis, respectively. The rotor 100 is used, for example, in a rotary motor mounted in a hybrid vehicle, electric vehicle, or fuel cell vehicle. Furthermore, Figure 1C The diagram shows rotating rotor 30a, and rotating rotor 30b has the same structure. (See diagram for reference.) Figures 1A to 1C As shown, the rotor 100 includes a rotating shaft 10, a fixed rotor 20, rotating rotors 30a and 30b, and spacers 40a and 40b.

[0014] The fixed rotor 20 includes a first rotor core 21 and a plurality of first magnets 22 respectively disposed in each of a plurality of first through holes 23 extending through the first rotor core 21 in the X-axis direction. The first rotor core 21 is cylindrical in shape extending parallel to the X-axis direction. The first magnets 22 are permanent magnets. A rotating shaft 10 is embedded and fixed to the inner side of the inner circumferential surface 24 of the first rotor core 21. Therefore, the fixed rotor 20 can rotate integrally with the rotating shaft 10. The plurality of first magnets 22 are arranged at a fixed interval in the circumferential direction of the first rotor core 21 with alternating polarities. For example, eight first magnets 22 are arranged at a fixed interval in the circumferential direction of the first rotor core 21.

[0015] Rotating rotors 30a and 30b are arranged adjacent to the fixed rotor 20, sandwiching it in the X-axis direction. Each rotating rotor 30a and 30b includes a second rotor core 31 and a plurality of second magnets 32, each disposed in one of a plurality of second through holes 33 extending through the second rotor core 31 in the X-axis direction. The inner diameter of the second rotor core 31 is larger than that of the first rotor core 21, and the second rotor core 31 is formed into a cylindrical shape extending parallel to the X-axis direction. The second magnets 32 are permanent magnets. The inner circumferential surface 34 of the second rotor core 31 is not fixed to the rotating shaft 10, but is mounted to the rotating shaft 10, for example, via bearings. Therefore, the rotating rotors 30a and 30b are mounted on the rotating shaft 10 in a manner that allows them to rotate relative to the rotating shaft 10 and the fixed rotor 20. The outer diameter of the second rotor core 31 is approximately the same as that of the first rotor core 21.

[0016] Multiple second magnets 32 are arranged at fixed intervals in the circumferential direction of the second rotor core 31 with alternating polarities. For example, eight second magnets 32 are arranged at fixed intervals in the circumferential direction of the second rotor core 31. The distance from the central axis 11 of the rotation shaft 10 to the second magnets 32 is approximately the same as the distance from the central axis 11 to the first magnets 22. Therefore, the second magnets 32 can be opposite to the first magnets 22 in the X-axis direction. The number of second magnets 32 is the same as the number of first magnets 22, so that all the second magnets 32 are opposite to all the first magnets 22 in the X-axis direction.

[0017] The second rotor core 31 has a first protrusion 35 on its inner circumferential surface 34 that protrudes toward the rotation shaft 10. For example, two first protrusions 35 are provided opposite each other, spaced apart from the rotation shaft 10. The first protrusions 35 have a generally rectangular shape when viewed from the X-axis direction. Furthermore, the number of first protrusions 35 is not limited to two; it can be one or more than three.

[0018] Spacers 40a and 40b are positioned inward of the inner circumferential surface 34 of the second rotor core 31. Spacers 40a and 40b are cylindrical, and their outer circumferential surfaces 46 have second protrusions 45. The rotating shaft 10 is embedded and fixed inside the inner circumferential surfaces 44 of the spacers 40a and 40b. Therefore, spacers 40a and 40b can rotate integrally with the rotating shaft 10. For example, two second protrusions 45 are provided at positions opposite to and 90° rotated relative to the first protrusions 35 about the rotating shaft 10. Furthermore, the number of second protrusions 45 is not limited to two; it can be one or more than three.

[0019] The rotating shaft 10 is formed, for example, of steel materials such as carbon steel or special steel. The first rotor core 21 and the second rotor core 31 are formed, for example, of electromagnetic steel plates. The spacers 40a and 40b are formed, for example, of steel materials such as carbon steel or special steel. The materials and / or composition concentrations of the steel materials of the rotating shaft 10 and the spacers 40a and 40b can be the same or different. Alternatively, the rotating shaft 10 and the spacers 40a and 40b can also be formed of non-magnetic metallic materials such as aluminum or stainless steel. The first rotor core 21 and the second rotor core 31 can also be formed of magnetic materials such as amorphous metals, nanocrystalline soft magnetic materials, or pressed powder magnetic cores.

[0020] Figure 2A and Figure 2B This is a top view schematic diagram showing the rotation of the rotating rotor 30a relative to the spacer portion 40a in the embodiment. The rotation of the rotating rotor 30b relative to the spacer portion 40b is also the same, therefore, the illustration and description are omitted. Figure 2A This indicates a situation where the rotating rotor 30a rotates relative to the fixed rotor 20 and the spacer 40a, such that the second magnet 32 ​​of the rotating rotor 30a and the first magnet 22 of the fixed rotor 20 face each other with the same polarity (N poles facing each other or S poles facing each other). Sometimes, facing with the same polarity is referred to as facing with the same poles. Figure 2B This indicates a situation where the rotating rotor 30a rotates relative to the fixed rotor 20 and the spacer 40a, such that the second magnet 32 ​​of the rotating rotor 30a and the first magnet 22 of the fixed rotor 20 face each other with opposite polarities (N pole and S pole facing each other). Sometimes, opposite polarity is referred to as opposite pole facing. The rotation of the rotating rotors 30a and 30b is controlled by adjusting the phase of the current energizing the stator coils of the rotating motor, thereby selecting between same pole facing and opposite pole facing.

[0021] like Figure 2A and Figure 1B As shown, when the second magnet 32 ​​of the rotating rotor 30a faces the first magnet 22 of the fixed rotor 20 with the same poles, the effective magnetic flux of the first magnet 22 and the second magnet 32 ​​increases. Therefore, the magnetomotive force increases, enabling the rotary electric machine with rotor 100 to obtain high torque characteristics when operating as a motor and high power generation characteristics when operating as a generator.

[0022] With the same poles facing each other, the rotating rotor 30a rotates relative to the spacer 40a and the fixed rotor 20, and the side of the first protrusion 35 provided on the inner circumferential surface 34 of the second rotor core 31 abuts against the side of the second protrusion 45 provided on the spacer 40a. Thus, the torque of the rotating rotor 30a is transmitted to the rotating shaft 10 via the spacer 40a. Therefore, for example, when a rotating magnetic field is formed by flowing current through the stator coils, the torque of the rotating rotor 30a is also transmitted to the rotating shaft 10 in addition to the fixed rotor 20. Furthermore, the rotational energy of the rotating shaft 10 can be converted and regenerated into current flowing to the stator coils.

[0023] When the rotating rotor 30a rotates relative to the spacer 40a, the first protrusion 35 abuts against the second protrusion 45, thereby causing the second magnet 32 ​​of the rotating rotor 30a and the first magnet 22 of the fixed rotor 20 to face each other with the same poles. That is, the abutment between the first protrusion 35 and the second protrusion 45 also serves to position the rotating rotor 30a so that it does not rotate excessively, and to ensure that the second magnet 32 ​​of the rotating rotor 30a and the first magnet 22 of the fixed rotor 20 face each other with the same poles.

[0024] like Figure 2B and Figure 1B As shown, when the second magnet 32 ​​of the rotating rotor 30a faces the opposite pole of the first magnet 22 of the fixed rotor 20, the effective magnetic flux of the first magnet 22 and the second magnet 32 ​​decreases. Therefore, a magnetic weakening effect can be obtained, which can improve the efficiency in the low torque region when the rotating electric machine with rotor 100 is operated as a motor, and improve the efficiency in the low power generation region when the rotating electric machine with rotor 100 is operated as a generator.

[0025] When opposite poles are facing each other, the first protrusion 35 on the inner circumferential surface 34 of the second rotor core 31 does not contact the second protrusion 45 on the spacer 40a. The first protrusion 35 and the second protrusion 45 are, for example, located at a position rotated 90° relative to the rotation axis 10. The spacer 40a and the fixed rotor 20 rotate integrally with the rotation axis 10. Since the second magnet 32 ​​and the first magnet 22 of the fixed rotor 20 are opposite poles facing each other, the rotating rotor 30a rotates synchronously with the fixed rotor 20. Therefore, when opposite poles are facing each other, the rotating rotor 30a and the spacer 40a maintain... Figure 2B As shown, it rotates together with the rotation axis 10.

[0026] Variations Figure 3 This is a top view of the rotating rotor 30a in a modified embodiment. Additionally, Figure 3 The image shows rotating rotor 30a, and rotating rotor 30b is the same. In the embodiment, as shown... Figure 1CAs shown, an example is illustrated where the first protrusion 35, provided on the inner circumferential surface 34 of the second rotor core 31, is formed by extending laterally from the inner circumferential surface 34 straight toward the rotation shaft 10. On the other hand, in a modified example, such as... Figure 3 As shown, the portion 38 connecting to the inner peripheral surface 34 of the first protrusion 35 is R-machined to form a circular shape. The root portion 38 of the first protrusion 35 is the part where the stress is greatest when the torque of the rotor 30a is transmitted to the rotating shaft 10 when the first protrusion 35 abuts against the second protrusion 45. By making the root portion 38 of the first protrusion 35 circular, stress can be alleviated and damage to the first protrusion 35 can be prevented.

[0027] According to the embodiments and their variations, such as Figure 2A and Figure 2B As shown, the spacer portion 40a, which rotates integrally with the rotating shaft 10, is positioned inside the inner circumferential surface 34 of the second rotor core 31 constituting the rotating rotor 30a. The rotating rotor 30a has a first protrusion 35 on the inner circumferential surface 34 of the cylindrical second rotor core 31. The spacer portion 40a has a second protrusion 45, which abuts against the side of the first protrusion 35 when the rotating rotor 30a rotates relative to the fixed rotor 20 and the second magnet 32 ​​of the rotating rotor 30a faces the first magnet 22 of the fixed rotor 20 with the same polarity. Thus, when the second magnet 32 ​​and the first magnet 22 face each other with the same polarity, the torque of the rotating rotor 30a is transmitted to the rotating shaft 10, resulting in high torque characteristics when used as an electric motor and high power generation characteristics when used as a generator. Furthermore, since only the rotating shaft 10 and the spacer portion 40a are positioned inside the inner circumferential surface 34 of the second rotor core 31, the number of components is reduced, thus allowing for a reduction in the inner diameter of the rotating rotor 30a. Therefore, it can suppress the narrowing of the magnetic circuit and suppress the performance degradation of the rotating motor.

[0028] Furthermore, in the embodiments and their variations, the spacers 40a and 40b are examples of components different from the rotation shaft 10, and the rotation shaft 10 is embedded inside the inner circumferential surface 44 of the spacers 40a and 40b. However, this is not a limitation; the spacers 40a and 40b may also be integrally formed with the rotation shaft 10 by machining the rotation shaft 10.

[0029] In addition, since the first protrusion 35 abuts against the second protrusion 45, a wear-resistant coating (such as a coating of hard ceramics such as titanium nitride, titanium carbonitride, or chromium nitride) can also be applied to the surface of the first protrusion 35 that abuts against the second protrusion 45.

[0030] The embodiments of the present invention have been described in detail above, but this disclosure is not limited to the specific embodiments. Various modifications and alterations can be made within the scope of the spirit of this disclosure as set forth in the claims.

[0031] Explanation of reference numerals in the attached figures 10 Rotation axis 11. Central Axis 20 Fixed rotor 21 First rotor core 22 First Magnet 23 First through hole 24 Inner circumferential surface Rotating rotors 30a and 30b 31 Second rotor core 32 Second magnet 33 Second through hole 34 Inner circumferential surface 35 First convex part 38 parts 40a, 40b Spacing 44 Inner circumferential surface 45 Second convex part 46 Outer circumference 100 rotor.

Claims

1. A rotor characterized by, have: Rotation axis; A fixed rotor includes a cylindrical first rotor core and a plurality of first magnets arranged circumferentially on the first rotor core, and is fixed to the rotating shaft; The rotating rotor includes a cylindrical second rotor core and a plurality of second magnets arranged circumferentially on the second rotor core, and is arranged adjacent to the fixed rotor in the axial direction of the rotating shaft, and is mounted on the rotating shaft in such a way that it can rotate relative to the fixed rotor; as well as The spacer portion is positioned inside the inner circumferential surface of the second rotor core and rotates integrally with the rotating shaft. The rotating rotor has a first protrusion on the inner circumferential surface of the second rotor core. The spacer portion has a second protrusion that abuts against the first protrusion when the rotating rotor rotates relative to the fixed rotor and the plurality of first magnets and the plurality of second magnets are opposite each other with the same polarity.

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