Low leakage flux asymmetric poly-magnetic pole rotor and pole motor

Abstract

This invention discloses a low-leakage flux asymmetric magnetic pole rotor and magnetic pole motor, comprising rotor laminations with eight magnetic pole regions uniformly arranged on the laminations. A first, second, third, and fourth permanent magnet group are sequentially repeated twice on the eight magnetic pole regions. Multiple identical rotor laminations are stacked and welded to form a rotor core. The magnetic pole polarities of any two adjacent permanent magnet groups in the eight magnetic pole regions are opposite. The permanent magnetic field within a single magnetic pole is asymmetric, and the permanent magnetic fields of adjacent magnetic poles are also asymmetric, reducing cogging torque, torque pulsation, and vibration noise. Each magnetic pole consists of multiple layers of permanent magnet steel and a magnetically insulating air gap, resulting in significant magnetic focusing effect, high magnetic field strength, high power density, low air gap harmonic magnetic flux density, low hysteresis loss, low stator core eddy current loss, and high motor output efficiency.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and in particular to a low-leakage flux asymmetric magnetic pole rotor and magnetic pole motor. Background Technology

[0002] Currently, most permanent magnet drive motor rotors used in electric vehicles employ a symmetrical magnetic pole structure. For example, existing technology, patented as "Drive Motor with Built-in Dual Radial Permanent Magnet Steel Synthetic Magnetic Field for Electric Vehicles" (patent number 2016103066565), discloses the following technical solution: each pole includes two sets of radial permanent magnets, each set consisting of two permanent magnet steel pieces. The multi-pole permanent magnets are evenly arranged along the rotor circumference and close to the outer edge of the rotor core. While this technology improves the magnetic field strength of the motor, it also reduces the utilization rate of permanent magnet steel, increases the cost of the drive motor, and lowers its cost-effectiveness. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a low-leakage magnetic flux asymmetric magnetic pole rotor and magnetic pole motor.

[0004] The objective of this invention is achieved through the following technical solution: A low-leakage flux asymmetric magnetic pole rotor includes rotor laminations, a first permanent magnet group, a second permanent magnet group, a third permanent magnet group, and a fourth permanent magnet group. Eight magnetic pole regions are uniformly arranged on the rotor laminations. The first permanent magnet group, the second permanent magnet group, the third permanent magnet group, and the fourth permanent magnet group are installed on the eight magnetic pole regions in sequence twice. Multiple identical rotor laminations are stacked and welded to form a rotor core. The magnetic pole polarities of any two adjacent permanent magnet groups in the eight magnetic pole regions are opposite.

[0005] Furthermore, the first permanent magnet assembly includes a first rectangular permanent magnet, a second rectangular permanent magnet, a third rectangular permanent magnet, and a fourth rectangular permanent magnet. The rotor lamination is provided with a first figure-eight groove, the middle of which is connected by a first connecting groove. A bending groove is connected to one side of the first figure-eight groove, and the first rectangular permanent magnet is fixedly disposed at the end of the bending groove. The second and third rectangular permanent magnets are respectively disposed near the end of the first figure-eight groove, and the first and second rectangular permanent magnets are arranged parallel to each other. The fourth rectangular permanent magnet is disposed in the middle of the first connecting groove.

[0006] Furthermore, the first permanent magnet assembly also includes a first semi-circular permanent magnet, a sixth rectangular permanent magnet, and a seventh rectangular permanent magnet. The rotor lamination is provided with a first arc groove, which is located at the far end of the first figure-eight groove. The first semi-circular permanent magnet is located in the first arc groove. The rotor lamination is provided with a first radial groove and a second radial groove along the radial direction. The first radial groove and the second radial groove are connected by a second connecting groove. The first radial groove is located close to the bending groove. The sixth rectangular permanent magnet is located in the first radial groove, and the seventh rectangular permanent magnet is located in the second connecting groove.

[0007] Furthermore, the second permanent magnet group includes an eighth rectangular permanent magnet, a ninth rectangular permanent magnet, and a tenth rectangular permanent magnet. The rotor lamination is provided with a second figure-eight groove. A third connecting groove is connected to the side of the second figure-eight groove near its end. A connecting slot perpendicular to the third connecting groove is provided between the third connecting groove and the second figure-eight groove. The eighth rectangular permanent magnet and the ninth rectangular permanent magnet are respectively disposed in the far end of the second figure-eight groove, and the tenth rectangular permanent magnet is disposed in the third connecting groove.

[0008] Furthermore, the rotor lamination is provided with a third figure-eight groove, which is located between the connecting empty groove and the other side of the second figure-eight groove. An eleventh rectangular permanent magnet and a twelfth rectangular permanent magnet are respectively provided in the third figure-eight groove, with the eleventh rectangular permanent magnet located close to the eighth rectangular permanent magnet.

[0009] Furthermore, the third permanent magnet group includes a thirteenth rectangular permanent magnet, a fourteenth rectangular permanent magnet, a fifteenth rectangular permanent magnet, and a second semi-circular permanent magnet. The rotor lamination is provided with a fourth figure-eight groove. A third radius groove is connected to one side of the fourth figure-eight groove. The other side of the fourth figure-eight groove is connected to the third radius groove through a fourth connecting groove. The thirteenth and fourteenth rectangular permanent magnets are respectively disposed in the far end of the fourth figure-eight groove. The fifteenth rectangular permanent magnet is disposed in the fourth connecting groove. A second arc groove is provided on the inner side of the far end of the fourth figure-eight groove. The second semi-circular permanent magnet is disposed in the second arc groove.

[0010] Furthermore, the fourth permanent magnet group includes a seventeenth rectangular permanent magnet, an eighteenth rectangular permanent magnet, a nineteenth rectangular permanent magnet, a twentieth rectangular permanent magnet, and a twenty-first rectangular permanent magnet. The rotor lamination is provided with a fifth figure-eight shaped slot. An isolation slot is provided between the near ends of the fifth figure-eight shaped slot, and a U-shaped slot is provided between the far ends of the fifth figure-eight shaped slot. The seventeenth and eighteenth rectangular permanent magnets are respectively disposed on both sides of the fifth figure-eight shaped slot, the nineteenth rectangular permanent magnet is disposed in the isolation slot, and the twentieth and twenty-first rectangular permanent magnets are respectively disposed on both sides of the U-shaped slot.

[0011] A magnetic pole motor includes a motor stator, a front end cover, a rear end cover, a motor shaft, and a magnetic pole rotor. The magnetic pole rotor is coaxially fixed on the motor shaft and coaxially arranged with the motor stator. One end of the motor shaft is disposed on the rear end cover, and the other end of the motor shaft is disposed on the front end cover and extends through the front end cover. The front end cover and the rear end cover are respectively fixed on both ends of the motor stator.

[0012] Furthermore, the rear end cover is connected to the motor shaft via a first bearing, and the front end cover is connected to the motor shaft via a second bearing.

[0013] The beneficial effects of this invention are: In this technology, the coordinated use of the first, second, third, and fourth permanent magnet groups results in asymmetrical permanent magnetic fields within a single magnetic pole, as well as asymmetrical permanent magnetic fields between adjacent poles. This reduces cogging torque, torque pulsation, and vibration noise. Each magnetic pole consists of multiple layers of permanent magnet steel and a magnetically insulating air gap, resulting in significant magnetization, high magnetic field strength, high power density, low air gap harmonic magnetic flux density, low hysteresis loss, low stator core eddy current loss, and high motor output efficiency. Simultaneously, the increased utilization rate of permanent magnet steel reduces the cost of the drive motor, thus improving its cost-effectiveness. Attached Figure Description

[0014] Figure 1 This is a structural diagram of the end face of the magnetic pole rotor; Figure 2 This diagram shows the arrangement of the N and S poles of the permanent magnet on the end face of the magnetic pole rotor. Figure 3 This is a diagram of the internal connection structure of a magnetic pole motor; In the diagram, 1-rotor lamination, 2-first rectangular permanent magnet, 3-second rectangular permanent magnet, 4-third rectangular permanent magnet, 5-fourth rectangular permanent magnet, 6-first figure-eight groove, 7-first connecting groove, 8-bending groove, 9-first semi-circular permanent magnet, 10-sixth rectangular permanent magnet, 11-seventh rectangular permanent magnet, 12-first arc groove, 13-first radius groove, 14-second radius groove, 15-second connecting groove, 16-eighth rectangular permanent magnet Steel, 17- Ninth rectangular permanent magnet, 18- Tenth rectangular permanent magnet, 19- Second figure-eight groove, 20- Third connecting groove, 21- Connecting empty groove, 22- Third figure-eight groove, 23- Eleventh rectangular permanent magnet, 24- Twelfth rectangular permanent magnet, 25- Thirteenth rectangular permanent magnet, 26- Fourteenth rectangular permanent magnet, 27- Fifteenth rectangular permanent magnet, 28- Second semi-circular permanent magnet, 29- Fourth figure-eight groove, 30- Third radius groove. 31-Fourth connecting groove, 32-Second circular arc groove, 33-Seventeenth rectangular permanent magnet, 34-Eighteenth rectangular permanent magnet, 35-Nineteenth rectangular permanent magnet, 36-Twentieth rectangular permanent magnet, 37-Twenty-first rectangular permanent magnet, 38-Fifth figure-eight groove, 39-Isolation groove, 40-U-shaped groove, 41-Motor stator, 42-Front end cover, 43-Rear end cover, 44-Motor shaft, 45-First bearing, 46-Second bearing. Detailed Implementation

[0015] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] See Figures 1-3 The present invention provides a technical solution: A low-leakage flux asymmetric magnetic pole rotor includes rotor laminations 1, a first permanent magnet group, a second permanent magnet group, a third permanent magnet group, and a fourth permanent magnet group. Eight magnetic pole regions are uniformly arranged on the rotor laminations 1. The first, second, third, and fourth permanent magnet groups are sequentially repeated twice on the eight magnetic pole regions. Multiple identical rotor laminations 1 are stacked and welded to form the rotor core. The magnetic pole polarities of any two adjacent permanent magnet groups in the eight magnetic pole regions are opposite. Specifically, the magnetic pole polarities of the first and second permanent magnet groups are opposite, the second and third permanent magnet groups are opposite, the third and fourth permanent magnet groups are opposite, and the fourth permanent magnet group is opposite to the first permanent magnet group. In the magnetic pole rotor, multiple rotor laminations 1 are stacked and fixed together, passing through the first, second, third, and fourth permanent magnet groups. The rectangular permanent magnets in the first, second, third, and fourth permanent magnet groups are not symmetrically arranged. No two permanent magnet groups in any of these groups are symmetrically arranged. In the magnetic pole rotor, each of the first, second, third, and fourth permanent magnet groups has two sets. The two sets of the first, second, third, and fourth permanent magnet groups are centrally symmetrically arranged, and they are arranged sequentially in a clockwise direction. The first and third permanent magnet groups are both N-pole groups, and the second and fourth permanent magnet groups are both S-pole groups.

[0017] In some embodiments, the first permanent magnet group includes a first rectangular permanent magnet 2, a second rectangular permanent magnet 3, a third rectangular permanent magnet 4, and a fourth rectangular permanent magnet 5. A first figure-eight groove 6 is provided on the rotor lamination 1. The middle part of the first figure-eight groove 6 is connected through a first connecting groove 7. A bending groove 8 is connected to one side of the first figure-eight groove 6. The first rectangular permanent magnet 2 is fixedly provided at the end of the bending groove 8. The second rectangular permanent magnet 3 and the third rectangular permanent magnet 4 are respectively provided on the near end of the first figure-eight groove 6, and the first rectangular permanent magnet 2 and the second rectangular permanent magnet 3 are arranged in parallel. The fourth rectangular permanent magnet 5 is provided on the middle part of the first connecting groove 7. The system includes a first mounting groove within the bending groove 8, where a first rectangular permanent magnet 2 is fixedly mounted. A first figure-eight groove 6 is positioned with its furthest end near the edge of the rotor lamination 1, and its closest end located in the middle of the rotor lamination 1, forming the upper end of the figure-eight shape and the lower end of the figure-eight shape. A second and third mounting groove are respectively located on both sides of the first figure-eight groove 6. A second rectangular permanent magnet 3 is fixedly mounted in the second mounting groove, and a third rectangular permanent magnet 4 is fixedly mounted in the third mounting groove, positioned between the first connecting groove 7 and the closest end of the first figure-eight groove 6. A fourth mounting groove is provided within the first connecting groove 7, where a fourth rectangular permanent magnet 5 is fixedly mounted. The inner sides of the second and third rectangular permanent magnets 3 and 4 are N poles. The side of the first rectangular permanent magnet 2 closest to the fourth rectangular permanent magnet 5 is also an N pole, as is the side of the fourth rectangular permanent magnet 5 closest to the first semi-circular permanent magnet 9. Air gaps are left at both ends of the first rectangular permanent magnet 2, the second rectangular permanent magnet 3, the third rectangular permanent magnet 4, and the fourth rectangular permanent magnet 5, and their two sides are used for fixed connection.

[0018] In some embodiments, the first permanent magnet assembly further includes a first semi-circular permanent magnet 9, a sixth rectangular permanent magnet 10, and a seventh rectangular permanent magnet 11. A first arcuate groove 12 is provided on the rotor lamination 1, located at the far end of the first figure-eight groove 6. The first semi-circular permanent magnet 9 is located within the first arcuate groove 12. A first radial groove 13 and a second radial groove 14 are provided on the rotor lamination 1 along the radial direction. The first radial groove 13 and the second radial groove 14 are connected by a second connecting groove 15. The first radial groove 13 is located near the bending groove 8. The sixth rectangular permanent magnet 10 is located in the first radial groove 13, and the seventh rectangular permanent magnet 11 is located in the second connecting groove 15. A sixth mounting groove is provided in the first radial groove 13, and the sixth rectangular permanent magnet 10 is fixedly mounted within the sixth mounting groove. A seventh mounting groove is provided in the second connecting groove 15, and the seventh rectangular permanent magnet 11 is fixedly mounted within the seventh mounting groove. The first semicircular permanent magnet 9 completely fills the first arc groove 12. The cross-section of the first semicircular permanent magnet 9 is fan-shaped, and the inner side of the first semicircular permanent magnet 9 is the N pole. The sixth rectangular permanent magnet 10 and the seventh rectangular permanent magnet 11 form a figure-eight structure. The inner side of the figure-eight structure of the sixth rectangular permanent magnet 10 and the seventh rectangular permanent magnet 11 is the N pole. Air gaps are left at both ends of the sixth rectangular permanent magnet 10 and the seventh rectangular permanent magnet 11. The first radius groove 13 and the second radius groove 14 are respectively set along the radial direction of the rotor lamination 1. The first radius groove 13 is set near the edge of the rotor lamination 1, and the second radius groove 14 is set near the center of the rotor lamination 1. The first semicircular permanent magnet 9 is close to the outer circle of the rotor, and the magnetic flux density of the air gap is closer to a sine wave. In the first permanent magnet group, the magnetic isolation air gap constrains the magnetic circuit direction of the permanent magnet steel, making the magnetic flux density at the outer circle of the rotor corresponding to each permanent magnet steel closer to 2T (2T is the magnetic saturation state). The overall magnetic poles are asymmetrical. The magnetic poles are composed of multiple layers of permanent magnet steel and magnetic isolation air gaps. The magnetic circuit direction is constrained by the corresponding magnetic isolation air gaps, making the magnetic field distribution more uniform, the magnetic concentration effect significant, and reducing the cogging torque.

[0019] In some embodiments, the second permanent magnet assembly includes an eighth rectangular permanent magnet 16, a ninth rectangular permanent magnet 17, and a tenth rectangular permanent magnet 18. A second figure-eight groove 19 is provided on the rotor lamination 1. A third connecting groove 20 is connected to one side of the second figure-eight groove 19 near its end. A connecting slot 21 perpendicular to the third connecting groove 20 is provided between the third connecting groove 20 and the second figure-eight groove 19. The eighth rectangular permanent magnet 16 and the ninth rectangular permanent magnet 17 are respectively disposed in the far end of the second figure-eight groove 19, and the tenth rectangular permanent magnet 18 is disposed in the third connecting groove 20. An eighth mounting groove and a ninth mounting groove are respectively provided on both sides of the second figure-eight groove 19. The eighth rectangular permanent magnet 16 is fixedly disposed in the eighth mounting groove, and the ninth rectangular permanent magnet 17 is fixedly disposed in the ninth mounting groove. A tenth mounting groove is provided on the third connecting groove 20, and the tenth rectangular permanent magnet 18 is fixedly disposed in the tenth mounting groove. The eighth rectangular permanent magnet 16 and the ninth rectangular permanent magnet 17 are asymmetrically arranged. The inner side enclosed by the eighth rectangular permanent magnet 16, the ninth rectangular permanent magnet 17, and the tenth rectangular permanent magnet 18 is the S pole. The eighth rectangular permanent magnet 16 and the ninth rectangular permanent magnet 17 are located near the edge of the rotor lamination 1, while the tenth rectangular permanent magnet 18 is located in the middle of the rotor lamination 1. Air gaps are provided at both ends of the eighth rectangular permanent magnet 16, the ninth rectangular permanent magnet 17, and the tenth rectangular permanent magnet 18. The eighth rectangular permanent magnet 16 is located near the third rectangular permanent magnet 4. The second permanent magnet group has an asymmetrical magnetic pole. This magnetic pole is composed of multiple layers and multiple sheets of permanent magnets and magnetic isolation air gaps. The magnetic circuit direction is constrained by the corresponding magnetic isolation air gaps, resulting in a more uniform magnetic field distribution and a significant magnetization effect. At the same time, it reduces the cogging torque. The magnetic isolation air gap slot is part of the permanent magnet pole and is located on one side of the permanent magnet, which weakens the armature reaction and reduces the risk of irreversible demagnetization of the internal permanent magnets.

[0020] In some embodiments, a third figure-eight groove 22 is provided on the rotor lamination 1. The third figure-eight groove 22 is located between the connecting empty groove 21 and the other side of the second figure-eight groove 19. An eleventh rectangular permanent magnet 23 and a twelfth rectangular permanent magnet 24 are respectively provided in the third figure-eight groove 22. The eleventh rectangular permanent magnet 23 is located near the eighth rectangular permanent magnet 16. An eleventh mounting groove and a twelfth mounting groove are respectively provided on both sides of the third figure-eight groove 22. The eleventh rectangular permanent magnet 23 and the twelfth rectangular permanent magnet 24 are fixedly installed in the eleventh mounting groove and the twelfth mounting groove, respectively. The eleventh rectangular permanent magnet 23 is located near the eighth rectangular permanent magnet 16. The inner side of the figure-eight shape formed by the eleventh rectangular permanent magnet 23 and the twelfth rectangular permanent magnet 24 is the S pole. Air gaps are left at both ends of the eleventh rectangular permanent magnet 23 and the twelfth rectangular permanent magnet 24. The third figure-eight groove 22 is located near the eighth rectangular permanent magnet 16.

[0021] In some embodiments, the third permanent magnet group includes a thirteenth rectangular permanent magnet 25, a fourteenth rectangular permanent magnet 26, a fifteenth rectangular permanent magnet 27, and a second semi-circular permanent magnet 28. A fourth figure-eight groove 29 is provided on the rotor lamination 1. A third radius groove 30 is connected to one side of the fourth figure-eight groove 29. The other side of the fourth figure-eight groove 29 is connected to the third radius groove 30 through a fourth connecting groove 31. The thirteenth rectangular permanent magnet 25 and the fourteenth rectangular permanent magnet 26 are respectively disposed in the far end of the fourth figure-eight groove 29. The fifteenth rectangular permanent magnet 27 is disposed in the fourth connecting groove 31. A second arc groove 32 is provided on the inner side of the far end of the fourth figure-eight groove 29. The second semi-circular permanent magnet 28 is disposed in the second arc groove 32. The fourth figure-eight groove 29 has a thirteenth and a fourteenth mounting groove on each side. The thirteenth rectangular permanent magnet 25 and the fourteenth rectangular permanent magnet 26 are fixedly installed in the thirteenth and fourteenth mounting grooves, respectively. The fourth connecting groove 31 has a fifteenth mounting groove, and the fifteenth rectangular permanent magnet 27 is fixedly installed in the fifteenth mounting groove. The third radius groove 30 is located near the center of the rotor lamination 1 and is perpendicular to the second radius groove 14. The fourth figure-eight groove 29 is located near the edge of the rotor lamination 1. The inner side of the area enclosed by the thirteenth rectangular permanent magnet 25, the fourteenth rectangular permanent magnet 26, and the fifteenth rectangular permanent magnet 27 is the N pole. Air gaps are left at both ends of the thirteenth rectangular permanent magnet 25, the fourteenth rectangular permanent magnet 26, and the fifteenth rectangular permanent magnet 27. The cross-section of the second semi-circular permanent magnet 28 is fan-shaped, and the inner side of the second semi-circular permanent magnet 28 is the N pole. The thirteenth rectangular permanent magnet 25 is positioned near the ninth rectangular permanent magnet 17.

[0022] In some embodiments, the fourth permanent magnet group includes a seventeenth rectangular permanent magnet 33, an eighteenth rectangular permanent magnet 34, a nineteenth rectangular permanent magnet 35, a twentieth rectangular permanent magnet 36, and a twenty-first rectangular permanent magnet 37. A fifth figure-eight groove 38 is provided on the rotor lamination 1. An isolation groove 39 is provided between the near ends of the fifth figure-eight groove 38, and a concave groove 40 is provided between the far ends of the fifth figure-eight groove 38. The seventeenth rectangular permanent magnet 33 and the eighteenth rectangular permanent magnet 34 are respectively disposed on both sides of the fifth figure-eight groove 38, the nineteenth rectangular permanent magnet 35 is disposed in the isolation groove 39, and the twentieth rectangular permanent magnet 36 and the twenty-first rectangular permanent magnet 37 are respectively disposed on both sides of the concave groove 40. Among them, the five-eight-shaped groove 38 has a seventeenth and an eighteenth mounting groove on both sides, and the seventeenth rectangular permanent magnet 33 and the eighteenth rectangular permanent magnet 34 are fixedly installed in the seventeenth and eighteenth mounting grooves respectively. The isolation groove 39 has a nineteenth mounting groove, and the nineteenth rectangular permanent magnet 35 is fixedly installed in the nineteenth mounting groove. The concave groove 40 has a twentieth and a twenty-first mounting groove on both sides, and the twentieth rectangular permanent magnet 36 and the twenty-first rectangular permanent magnet 37 are fixedly installed in the twentieth and twenty-first mounting grooves respectively. The inner side enclosed by the seventeenth rectangular permanent magnet 33, the eighteenth rectangular permanent magnet 34 and the nineteenth rectangular permanent magnet 35 is the S pole, and the opposite inner side of the twentieth rectangular permanent magnet 36 and the twenty-first rectangular permanent magnet 37 is the S pole. Air gaps are left at both ends of the seventeenth rectangular permanent magnet 33, the eighteenth rectangular permanent magnet 34 and the nineteenth rectangular permanent magnet 35, and air gaps are left at one end of the twentieth rectangular permanent magnet 36 and the twenty-first rectangular permanent magnet 37.

[0023] A magnetic pole motor includes a motor stator 41, a front end cover 42, a rear end cover 43, a motor shaft 44, and a magnetic pole rotor. The magnetic pole rotor is coaxially fixed on the motor shaft 44 and coaxially arranged with the motor stator 41. One end of the motor shaft 44 is mounted on the rear end cover 43, and the other end is mounted on the front end cover 42 and extends through the front end cover 42. The front end cover 42 and the rear end cover 43 are respectively fixed to both ends of the motor stator 41. The rear end cover 43 is connected to the motor shaft 44 via a first bearing 45, and the front end cover 42 is connected to the motor shaft 44 via a second bearing 46. The motor stator 41 is existing technology. The front end cover 42 and the rear end cover 43 are used together to mount the motor shaft 44, which is used to mount the magnetic pole rotor. The first bearing 45 and the second bearing 46 are both existing bearings, reducing friction during the rotation of the motor shaft 44.

[0024] In the description of this invention, it should be understood that the terms "upper", "lower", "bottom", "one end", "top", "middle", "other end", "coaxial", "one side", "inner", "front", "center", "both ends", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0025] In this invention, unless otherwise explicitly specified and limited, the terms "set", "install", "connect", "fix", "hinged", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0026] The above description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A low-leakage flux asymmetric magnetic pole rotor, characterized in that: The rotor core includes rotor laminations (1), a first permanent magnet group, a second permanent magnet group, a third permanent magnet group, and a fourth permanent magnet group. Eight magnetic pole regions are uniformly arranged on the rotor laminations (1). The first permanent magnet group, the second permanent magnet group, the third permanent magnet group, and the fourth permanent magnet group are installed on the eight magnetic pole regions in sequence twice. Multiple identical rotor laminations (1) are stacked and welded to form a rotor core. The magnetic pole polarities of any two adjacent permanent magnet groups in the eight magnetic pole regions are opposite.

2. The low-leakage flux asymmetric magnetic pole rotor according to claim 1, characterized in that: The first permanent magnet group includes a first rectangular permanent magnet (2), a second rectangular permanent magnet (3), a third rectangular permanent magnet (4) and a fourth rectangular permanent magnet (5). The rotor lamination (1) is provided with a first figure-eight groove (6). The middle part of the first figure-eight groove (6) is connected through a first connecting groove (7). A bending groove (8) is connected to one side of the first figure-eight groove (6). The first rectangular permanent magnet (2) is fixedly provided at the end of the bending groove (8). The second rectangular permanent magnet (3) and the third rectangular permanent magnet (4) are respectively provided on the near end of the first figure-eight groove (6). The first rectangular permanent magnet (2) and the second rectangular permanent magnet (3) are arranged in parallel. The fourth rectangular permanent magnet (5) is provided on the middle part of the first connecting groove (7).

3. The low-leakage flux asymmetric magnetic pole rotor according to claim 2, characterized in that: The first permanent magnet group also includes a first semi-circular permanent magnet (9), a sixth rectangular permanent magnet (10) and a seventh rectangular permanent magnet (11). The rotor lamination (1) is provided with a first arc groove (12). The first arc groove (12) is located in the far end of the first figure-eight groove (6). The first semi-circular permanent magnet (9) is located in the first arc groove (12). The rotor lamination (1) is provided with a first radius groove (13) and a second radius groove (14) along the radial direction. The first radius groove (13) and the second radius groove (14) are connected by a second connecting groove (15). The first radius groove (13) is located close to the bending groove (8). The sixth rectangular permanent magnet (10) is located in the first radius groove (13). The seventh rectangular permanent magnet (11) is located in the second connecting groove (15).

4. The low-leakage flux asymmetric magnetic pole rotor according to any one of claims 1-3, characterized in that: The second permanent magnet group includes an eighth rectangular permanent magnet (16), a ninth rectangular permanent magnet (17) and a tenth rectangular permanent magnet (18). The rotor lamination (1) is provided with a second figure-eight groove (19). A third connecting groove (20) is connected to one side of the second figure-eight groove (19) near the end. A connecting slot (21) perpendicular to the third connecting groove (20) is provided between the third connecting groove (20) and the second figure-eight groove (19). The eighth rectangular permanent magnet (16) and the ninth rectangular permanent magnet (17) are respectively located in the far end of the second figure-eight groove (19). The tenth rectangular permanent magnet (18) is located in the third connecting groove (20).

5. The low-leakage flux asymmetric magnetic pole rotor according to claim 4, characterized in that: The rotor lamination (1) is provided with a third figure-eight groove (22), which is located between the connecting empty groove (21) and the other side of the second figure-eight groove (19). The third figure-eight groove (22) is provided with an eleventh rectangular permanent magnet (23) and a twelfth rectangular permanent magnet (24), respectively. The eleventh rectangular permanent magnet (23) is located near the eighth rectangular permanent magnet (16).

6. The low-leakage flux asymmetric magnetic pole rotor according to any one of claims 1-3, characterized in that: The third permanent magnet group includes a thirteenth rectangular permanent magnet (25), a fourteenth rectangular permanent magnet (26), a fifteenth rectangular permanent magnet (27), and a second semi-circular permanent magnet (28). The rotor lamination (1) is provided with a fourth figure-eight groove (29). A third radius groove (30) is connected to one side of the fourth figure-eight groove (29). The other side of the fourth figure-eight groove (29) is connected to the third radius groove (30) through a fourth connecting groove (31). The thirteenth rectangular permanent magnet (25) and the fourteenth rectangular permanent magnet (26) are respectively located in the far end of the fourth figure-eight groove (29). The fifteenth rectangular permanent magnet (27) is located in the fourth connecting groove (31). A second arc groove (32) is provided on the inner side of the far end of the fourth figure-eight groove (29). The second semi-circular permanent magnet (28) is located in the second arc groove (32).

7. The low-leakage flux asymmetric magnetic pole rotor according to any one of claims 1-3, characterized in that: The fourth permanent magnet group includes a seventeenth rectangular permanent magnet (33), an eighteenth rectangular permanent magnet (34), a nineteenth rectangular permanent magnet (35), a twentieth rectangular permanent magnet (36), and a twenty-first rectangular permanent magnet (37). The rotor lamination (1) is provided with a fifth figure-eight groove (38). An isolation groove (39) is provided between the near ends of the fifth figure-eight groove (38), and a concave groove (40) is provided between the far ends of the fifth figure-eight groove (38). The seventeenth rectangular permanent magnet (33) and the eighteenth rectangular permanent magnet (34) are respectively located on both sides of the fifth figure-eight groove (38). The nineteenth rectangular permanent magnet (35) is located in the isolation groove (39). The twentieth rectangular permanent magnet (36) and the twenty-first rectangular permanent magnet (37) are respectively located on both sides of the concave groove (40).

8. A magnetic pole motor, characterized in that: The device includes a motor stator (41), a front end cover (42), a rear end cover (43), a motor shaft (44), and a magnetic pole rotor as described in any one of claims 1-7. The magnetic pole rotor is coaxially fixed on the motor shaft (44) and coaxially arranged with the motor stator (41). One end of the motor shaft (44) is disposed on the rear end cover (43), and the other end of the motor shaft (44) is disposed on the front end cover (42) and protrudes from the front end cover (42). The front end cover (42) and the rear end cover (43) are respectively fixed on both ends of the motor stator (41).

9. A magnetic pole motor according to claim 8, characterized in that: The rear end cover (43) is connected to the motor shaft (44) via a first bearing (45), and the front end cover (42) is connected to the motor shaft (44) via a second bearing (46).

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