CN220915016U - Rotor and spoke type permanent magnet motor - Google Patents
Rotor and spoke type permanent magnet motor Download PDFInfo
- Publication number
- CN220915016U CN220915016U CN202322538468.3U CN202322538468U CN220915016U CN 220915016 U CN220915016 U CN 220915016U CN 202322538468 U CN202322538468 U CN 202322538468U CN 220915016 U CN220915016 U CN 220915016U
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- rotor
- permanent magnet
- auxiliary salient
- magnet motor
- spoke type
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- 239000000463 material Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims 1
- 230000010349 pulsation Effects 0.000 abstract description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000004020 conductor Substances 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 229910052761 rare earth metal Inorganic materials 0.000 description 3
- 230000003313 weakening effect Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 150000002910 rare earth metals Chemical class 0.000 description 2
- 229920001342 Bakelite® Polymers 0.000 description 1
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000004637 bakelite Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910001172 neodymium magnet Inorganic materials 0.000 description 1
- -1 neodymium-iron-boron rare earth Chemical class 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The utility model discloses a rotor and spoke type permanent magnet motor, wherein the rotor comprises a rotor iron core and permanent magnets, and the permanent magnets and the rotor iron cores are sequentially and alternately arranged along the circumferential direction of the rotor; the rotor core comprises a core body and auxiliary salient poles, the auxiliary salient poles are arranged on the outer side of the core body, the size of each auxiliary salient pole in the radial direction of the rotor is increased and then reduced along the circumferential direction of the rotor, and the outer contour surfaces of the auxiliary salient poles extend to the outer circumferential surface of the core body at two ends of the circumferential direction of the rotor; the projection of the outer contour surface of the auxiliary salient pole on the end surface of the rotor forms a contour line, and the contour line is an inverse cosine curve. When the rotor provided by the embodiment of the utility model is applied to the spoke type permanent magnet motor, the cogging torque and the air gap harmonic wave of the spoke type permanent magnet motor can be reduced, so that the torque pulsation output by the spoke type permanent magnet motor is weakened.
Description
Technical Field
The utility model relates to the technical field of spoke type permanent magnet motors, in particular to a rotor and a spoke type permanent magnet motor.
Background
The permanent magnet motor, especially the neodymium-iron-boron rare earth permanent magnet motor, has the advantages of small volume, light structure, reliable operation and the like, and is widely applied to various fields from automobiles to aerospace and the like. In recent years, with the continuous exploitation of rare earth resources and the implementation of related protection policies, the price of rare earth in the international market is continuously increased, and the rotor structure of the spoke type permanent magnet motor has a magnetism gathering effect, so that the torque density of the motor is improved, the utilization rate of a permanent magnet can be greatly improved, and the material cost of the permanent magnet motor is reduced, so that the spoke type permanent magnet motor becomes a research hot spot in recent years.
In the related art, a spoke type permanent magnet motor is disclosed, a rotor is rotatably arranged in a stator, an air gap is formed between the stator and the rotor, and the air gap is uniformly distributed along the circumferential direction of the rotor; the rotor includes a rotor core and permanent magnets arranged in the rotor core in a manner similar to a wheel spoke. When the rotor structure is adopted, the cogging torque generated when the permanent magnet interacts with the stator is larger, and redundant air gap harmonic waves are generated in the operation process of the spoke type permanent magnet motor, so that the torque pulsation output by the spoke type permanent magnet motor is higher.
Disclosure of utility model
The present utility model aims to solve at least one of the technical problems in the related art to some extent.
Therefore, the embodiment of the utility model provides a rotor which can reduce the cogging torque and the air gap harmonic wave of the spoke type permanent magnet motor when being applied to the spoke type permanent magnet motor, thereby weakening the torque pulsation output by the spoke type permanent magnet motor.
The rotor comprises a rotor core and permanent magnets, wherein the permanent magnets and the rotor core are alternately arranged in sequence along the circumferential direction of the rotor; the rotor core comprises a core body and auxiliary salient poles, the auxiliary salient poles are arranged on the outer side of the core body, the size of the auxiliary salient poles in the radial direction of the rotor is increased and then reduced along the circumferential direction of the rotor, and the outer contour surfaces of the auxiliary salient poles extend to the outer circumferential surface of the core body at two ends of the circumferential direction of the rotor; and the projection of the outer contour surface of the auxiliary salient pole on the end surface of the rotor forms a contour line, and the contour line is an inverse cosine curve.
In some embodiments, the auxiliary salient poles are symmetrically arranged along a circumferential direction of the rotor.
In some embodiments, the plurality of auxiliary salient poles are arranged in a central symmetry along a circumferential direction of the rotor.
In some embodiments, the auxiliary salient poles are integrally formed with the core body.
In some embodiments, the permanent magnet is adhesively secured to the rotor core.
In some embodiments, the auxiliary salient poles have a maximum dimension in a radial direction of the rotor of 1mm-2mm.
The permanent magnet motor provided by the embodiment of the utility model comprises a stator and a rotor, wherein the rotor is the rotor in any embodiment, the rotor is rotatably arranged in the stator, and an air gap is formed between the rotor and the stator.
In some embodiments, the spoke type permanent magnet motor further comprises a connecting piece and a rotating shaft, wherein the connecting piece is made of a non-magnetic conductive material, and the connecting piece penetrates through the rotor; the rotating shaft penetrates through the connecting piece, and the rotating shaft is connected with the rotor through the connecting piece.
In some embodiments, a first clamping portion is provided on the rotor, and a second clamping portion is provided on the connecting piece, and the second clamping portion is in clamping fit with the first clamping portion, so that the connecting piece is connected with the rotor.
In some embodiments, the first clamping portions are in one-to-one correspondence with the rotor core, and the second clamping portions are in one-to-one correspondence with the first clamping portions.
According to the rotor provided by the embodiment of the utility model, the auxiliary salient poles are arranged on the outer side of the iron core body, and the outline line formed by the projection of the outer outline surface of the auxiliary salient poles on the end surface of the rotor is an inverse cosine curve, when the rotor is used in a spoke type permanent magnet motor, air gaps formed between the rotor and the stator are unevenly distributed along the circumferential direction of the rotor, and compared with the air gaps evenly distributed along the circumferential direction of the rotor in the related art, the cogging torque can be reduced, and the air gap harmonic wave between the rotor and the stator can be reduced, so that the torque pulsation output by the spoke type permanent magnet motor is weakened.
Therefore, when the rotor provided by the embodiment of the utility model is used for the spoke type permanent magnet motor, the torque pulsation output by the spoke type permanent magnet motor can be weakened.
Drawings
Fig. 1 is a schematic structural view of a rotor according to an embodiment of the present utility model.
Fig. 2 is a schematic structural view of a rotor core of a rotor according to an embodiment of the present utility model.
Fig. 3 is a schematic structural view of a spoke type permanent magnet motor according to an embodiment of the present utility model.
Fig. 4 is a partial perspective view of a spoke type permanent magnet motor according to an embodiment of the present utility model.
Reference numerals: 100. a spoke type permanent magnet motor;
10. A rotor; 1. a rotor core; 11. an iron core body; 12. auxiliary salient poles; 121. a contour line; 13. a first clamping part; 2. a permanent magnet;
20. A stator; 201. an air gap;
30. A connecting piece; 301. a second clamping part;
40. A rotating shaft.
Detailed Description
Reference will now be made in detail to embodiments of the present utility model, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.
As shown in fig. 1 and 2, a rotor 10 of an embodiment of the present utility model includes a rotor core 1 and permanent magnets 2, the permanent magnets 2 and the rotor core 1 being alternately arranged in order in the circumferential direction of the rotor 10; the rotor core 1 includes a core body 11 and auxiliary salient poles 12, the auxiliary salient poles 12 are arranged outside the core body 11, the size of the auxiliary salient poles 12 in the radial direction of the rotor 10 increases and decreases along the circumferential direction of the rotor 10, and the outer contour surfaces of the auxiliary salient poles 12 extend to the outer circumferential surface of the core body 11 at both ends of the circumferential direction of the rotor 10; projection of the outer contour surface of the auxiliary salient pole 12 on the end surface of the rotor 10 forms a contour line 121, and the contour line 121 is an inverse cosine curve.
In the rotor 10 of the embodiment of the present utility model, the auxiliary salient pole 12 is disposed on the outer side of the iron core body 11, and the outline 121 formed by the projection of the outer outline surface of the auxiliary salient pole 12 on the end surface of the rotor 10 is an inverse cosine curve, when the rotor 10 is used in the spoke type permanent magnet motor 100, the air gaps formed between the rotor 10 and the stator 20 are unevenly distributed along the circumferential direction of the rotor 10, and compared with the air gaps evenly distributed along the circumferential direction of the rotor 10 in the related art, the cogging torque can be reduced, and the air gap harmonic between the rotor 10 and the stator 20 can be reduced, so that the torque pulsation output by the spoke type permanent magnet motor 100 is weakened.
Alternatively, as shown in fig. 1, eight rotor cores 1 and permanent magnets 2 are provided, respectively, and eight permanent magnets 2 and eight rotor cores 1 are alternately arranged in turn in the circumferential direction of the rotor 10, with one permanent magnet 2 between each adjacent two rotor cores 1, and one rotor core 1 between each adjacent two permanent magnets 2.
It will be appreciated that, as shown in fig. 2, the side surface of the auxiliary salient pole 12, which is close to the core body 11, is an inner contour surface thereof, and the inner contour surface of the auxiliary salient pole 12 coincides with the outer peripheral surface of the core body 11; the dimension of the auxiliary salient poles 12 in the radial direction of the rotor 10 means: the straight line extending in the radial direction of the rotor 10 is spaced from two intersections formed by the inner and outer contour surfaces of the auxiliary salient poles 12.
It will be appreciated that the outer circumferential surfaces of the plurality of core bodies 11 are all located on the same cylindrical surface, and the side surface of the permanent magnet 2 away from the axis of the rotor 10 is located in the cylindrical surface, so that the outer contour of the rotor 10 is concave at the position corresponding to the permanent magnet 2, and convex at the position corresponding to the auxiliary salient pole 12.
In some embodiments, the auxiliary salient poles 12 are symmetrically arranged along the circumferential direction of the rotor 10.
By arranging the auxiliary salient poles 12 symmetrically along the circumferential direction of the rotor 10, the symmetry of the rotor 10 as a whole can be improved, and the stability of the rotor 10 can be made higher, thereby weakening the torque ripple output from the spoke type permanent magnet motor 100.
In some embodiments, the plurality of auxiliary salient poles 12 are arranged centrally symmetrically along the circumferential direction of the rotor 10.
By arranging the plurality of auxiliary salient poles 12 in a central symmetry manner, the overall symmetry of the rotor 10 can be further improved, and the rotor 10 can run more stably, so that torque pulsation output by the spoke type permanent magnet motor 100 is weakened.
In some embodiments, the auxiliary salient poles 12 are integrally formed with the core body 11.
By integrally molding the auxiliary salient poles 12 and the core body 11, the production and manufacture are more convenient, and the strength of the formed rotor core 1 is also higher.
Alternatively, the core body 11 and the auxiliary salient poles 12 are made of silicon steel.
In some embodiments, the permanent magnets 2 are adhesively secured to the rotor core 1.
The permanent magnet 2 and the rotor core 1 are mutually fixed in an adhesive mode, so that the assembly process of the permanent magnet 2 and the rotor core 1 is simpler and more convenient, and the production efficiency is higher.
Alternatively, the glue used for bonding the permanent magnets 2 to the rotor core 1 is made of a non-magnetically conductive material.
In some embodiments, the auxiliary salient poles 12 have a maximum dimension in the radial direction of the rotor 10 of 1mm-2mm.
The arrangement of the auxiliary salient poles 12 can reduce the output torque of the spoke type permanent magnet motor 100 while weakening the torque pulsation output by the spoke type permanent magnet motor 100; by setting the maximum dimension of the auxiliary salient pole 12 in the radial direction of the rotor 10 to the above-described range, the output torque and torque ripple of the spoke-type permanent magnet motor 100 can be well balanced, thereby reducing the influence of the setting of the auxiliary salient pole 12 on the output torque of the spoke-type permanent magnet motor 100.
It can be appreciated that since the dimension of the auxiliary salient poles 12 in the radial direction of the rotor 10 increases and then decreases in the circumferential direction of the rotor 10 and the auxiliary salient poles 12 are of axisymmetric structure, the maximum dimension of the auxiliary salient poles 12 in the radial direction of the rotor 10 is: the symmetry axis of the auxiliary salient pole 12 is spaced from two intersections formed by the inner and outer contour surfaces of the auxiliary salient pole 12.
Preferably, the maximum size of the auxiliary salient poles 12 in the radial direction of the rotor 10 is set to 1.36mm.
As shown in fig. 3, the spoke type permanent magnet motor 100 according to the embodiment of the present utility model includes a stator 20 and a rotor 10, the rotor 10 is the rotor 10 according to any one of the embodiments, the rotor 10 is rotatably disposed in the stator 20, and an air gap 201 is formed between the rotor 10 and the stator 20.
The air gap 201 is formed between the rotor 10 and the stator 20, since the auxiliary salient pole 12 is in a convex shape outside the core body 11, the length of the air gap 201 between the outer contour surface of the auxiliary salient pole 12 and the inner circumferential surface of the stator 20 is small, the air gap 201 is a first air gap, the length of the air gap 201 between the side surface of the permanent magnet 2 far from the axis of the rotor 10 and the inner circumferential surface of the stator 20 is large, the air gap 201 is a second air gap, the first air gap and the second air gap are alternately arranged in turn along the circumferential direction of the rotor 10, so that the air gaps 201 are unevenly distributed along the circumferential direction of the rotor 10, the cogging torque of the spoke type permanent magnet motor 100 can be reduced, and meanwhile, the air gap harmonic between the rotor 10 and the stator 20 is reduced, so that the torque pulsation output by the spoke type permanent magnet motor 100 is weakened. The length of the air gap 201 refers to the dimension of the air gap 201 in the radial direction of the rotor 10.
In addition, the outline 121 formed by the projection of the outer outline surface of the auxiliary salient pole 12 on the end surface of the rotor 10 is an inverse cosine curve, so that the cogging torque and the air gap harmonic of the spoke type permanent magnet motor 100 can be further reduced, and the torque pulsation output by the spoke type permanent magnet motor 100 is further weakened.
In some embodiments, as shown in fig. 4, the spoke-type permanent magnet motor 100 further includes a connecting member 30 and a rotating shaft 40, the connecting member 30 is made of a non-magnetic conductive material, and the connecting member 30 penetrates through the rotor 10; the rotating shaft 40 penetrates through the connecting piece 30, and the rotating shaft 40 and the rotor 10 are connected with each other through the connecting piece 30.
The rotating shaft 40 and the rotor 10 are separated by the connecting piece 30, so that the probability of magnetization of the rotating shaft 40 caused by magnetic leakage phenomenon of one end of the permanent magnet 2 close to the axis of the rotor 10 is reduced, and the running stability of the spoke type permanent magnet motor 100 is improved.
Alternatively, the non-magnetically permeable material used to make the connector 30 may be insulating bakelite.
It is understood that, in order to facilitate the coupling member 30 to cooperate with the rotor 10 and the rotating shaft 40, the coupling member 30 needs to be cylindrical, and the rotor 10, the coupling member 30 and the rotating shaft 40 are coaxially disposed.
It will be appreciated that the shaft 40 and the connector 30 may be keyed to allow the shaft 40 and the connector 30 to rotate in unison.
In some embodiments, the rotor 10 is provided with a first clamping portion 13, the connecting piece 30 is provided with a second clamping portion 301, and the second clamping portion 301 is in clamping fit with the first clamping portion 13, so that the connecting piece 30 and the rotor 10 are connected.
The connecting piece 30 and the rotor 10 are mutually connected in a clamping fit mode, so that the cost is lower compared with a welding or bolting mode, the assembly difficulty is lower, and the production efficiency is higher.
Alternatively, as shown in fig. 4, the inner peripheral surface of the rotor 10 is provided with a clamping member forming a first clamping portion 13; the outer peripheral surface of the connecting piece 30 is provided with a clamping groove, the clamping groove forms a second clamping part 301, and the clamping piece is clamped and matched in the clamping groove, so that the rotor 10 and the connecting piece 30 can be connected.
Alternatively, the clamping member is in a strip shape and extends along the axial direction of the rotor 10, and two end surfaces of the clamping member along the axial direction of the rotor 10 are respectively flush with two end surfaces of the rotor 10 along the axial direction; the clamping piece is the width along the circumferential direction of the rotor 10, and the width of one side of the clamping piece, which is close to the axis of the rotor 10, is larger than the width of one side of the clamping piece, which is far away from the axis of the rotor 10, so that the probability of loosening of the rotor core 1 and the connecting piece 30 along the radial direction of the rotor 10 is reduced.
It will be appreciated that the first clamping portion 13 and the second clamping portion 301 may be bonded to limit the relative movement of the rotor 10 and the connecting member 30 along the axial direction thereof, and/or the relative movement of the rotor 10 and the connecting member 30 may be limited by other related structures of the spoke type permanent magnet motor 100.
In some embodiments, the first clamping portions 13 are in one-to-one correspondence with the rotor core 1, and the second clamping portions 301 are in one-to-one correspondence with the first clamping portions 13.
The rotor core 1 is uniformly arranged in a plurality along the circumferential direction of the rotor 10, the first clamping part 13 and the second clamping part 301 are also arranged in a plurality along the circumferential direction of the rotor 10, and a plurality of connection points are formed between the rotor 10 and the connecting piece 30 along the circumferential direction of the rotor 10, so that the connection stability of the rotor 10 and the connecting piece 30 can be improved.
Alternatively, the clip is integrally formed with the rotor core 1.
While embodiments of the present utility model have been shown and described above, it should be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives, and variations of the above embodiments may be made by those skilled in the art without departing from the scope of the utility model.
Claims (10)
1. A rotor (10), characterized by comprising:
A rotor core (1), and
Permanent magnets (2), the permanent magnets (2) and the rotor core (1) being alternately arranged in sequence along the circumferential direction of the rotor (10);
The rotor core (1) comprises a core body (11) and auxiliary salient poles (12), wherein the auxiliary salient poles (12) are arranged on the outer side of the core body (11), the size of the auxiliary salient poles (12) in the radial direction of the rotor (10) is increased and then reduced along the circumferential direction of the rotor (10), and the outer contour surfaces of the auxiliary salient poles (12) extend to the outer circumferential surface of the core body (11) at two ends of the circumferential direction of the rotor (10);
a projection of the outer contour surface of the auxiliary salient pole (12) on the end surface of the rotor (10) forms a contour line (121), and the contour line (121) is an inverse cosine curve.
2. The rotor (10) according to claim 1, wherein the auxiliary salient poles (12) are symmetrically arranged along a circumferential direction of the rotor (10).
3. The rotor (10) according to claim 1, wherein a plurality of the auxiliary salient poles (12) are arranged in central symmetry along a circumferential direction of the rotor (10).
4. The rotor (10) according to claim 1, wherein the auxiliary salient poles (12) are integrally formed with the core body (11).
5. The rotor (10) according to claim 1, characterized in that the permanent magnets (2) are adhesively fixed to the rotor core (1).
6. The rotor (10) according to claim 1, wherein a maximum dimension of the auxiliary salient pole (12) in a radial direction of the rotor (10) is 1mm to 2mm.
7. A spoke type permanent magnet motor (100), characterized by comprising:
a stator (20); and
A rotor (10), the rotor (10) being a rotor (10) according to any one of claims 1-6, the rotor (10) being rotatably arranged in the stator (20), an air gap (201) being formed between the rotor (10) and the stator (20).
8. The spoke type permanent magnet motor (100) according to claim 7, wherein the spoke type permanent magnet motor (100) further comprises:
The connecting piece (30), the connecting piece (30) is made of non-magnetic conduction material, and the connecting piece (30) penetrates through the rotor (10);
The rotating shaft (40) is arranged on the connecting piece (30) in a penetrating mode, and the rotating shaft (40) and the rotor (10) are connected with each other through the connecting piece (30).
9. The spoke type permanent magnet motor (100) according to claim 8, wherein a first clamping portion (13) is arranged on the rotor (10), a second clamping portion (301) is arranged on the connecting piece (30), and the second clamping portion (301) is matched with the first clamping portion (13) in a clamping manner, so that the connecting piece (30) is connected with the rotor (10).
10. The spoke type permanent magnet motor (100) according to claim 9, wherein the first clamping portions (13) are in one-to-one correspondence with the rotor core (1), and the second clamping portions (301) are in one-to-one correspondence with the first clamping portions (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322538468.3U CN220915016U (en) | 2023-09-18 | 2023-09-18 | Rotor and spoke type permanent magnet motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322538468.3U CN220915016U (en) | 2023-09-18 | 2023-09-18 | Rotor and spoke type permanent magnet motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220915016U true CN220915016U (en) | 2024-05-07 |
Family
ID=90904900
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322538468.3U Active CN220915016U (en) | 2023-09-18 | 2023-09-18 | Rotor and spoke type permanent magnet motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220915016U (en) |
-
2023
- 2023-09-18 CN CN202322538468.3U patent/CN220915016U/en active Active
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