Rotor of motor, motor and vehicle

Abstract

The utility model discloses a motor rotor, a motor and a vehicle, the motor rotor comprises a rotor core, the rotor core is provided with a plurality of circumferentially distributed magnetic poles, the magnetic poles comprise a plurality of magnetic slot rows which are spaced along the radial direction of the rotor core, the plurality of magnetic slot rows comprise a first magnetic slot row, the first magnetic slot row comprises a first main magnetic slot and a first auxiliary magnetic slot, and the first auxiliary magnetic slot comprises a second main magnetic slot and a second auxiliary magnetic slot. The first main magnetic slots are located on the two opposite sides of the first auxiliary magnetic slot respectively, the first auxiliary magnetic slot comprises a first slot section and a second slot section, and an included angle alpha is formed between the length direction of the first slot section and the length direction of the second slot section; and at least part of the magnets are respectively arranged in the first main magnetic groove, the first groove section and the second groove section and are arranged at intervals. Therefore, a larger space can be provided for the arrangement of the first main magnetic slots, the area of the first main magnetic slots can be increased by increasing the thickness of the magnets of the first main magnetic slots, the magnetic field intensity in the rotor can be enhanced, the magnetic resistance in a magnetic circuit can be reduced, and the torque power of the rotor can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a rotor of a motor, a motor and a vehicle. Background Art

[0002] In the prior art, the space utilization rate of the magnetic slots provided on the rotor core of the motor is insufficient, resulting in the underutilization of the reluctance torque utilization rate of the rotor of the motor. Moreover, the magnetic field intensity on the rotor core is insufficient and the magnetic field distribution is uneven, causing a large loss power of the motor and reducing the torque of the motor rotor. Summary of the Utility Model

[0003] The utility model aims to at least solve one of the technical problems existing in the prior art. For this purpose, the utility model provides a rotor of a motor, in which an included angle exists between the length direction of a first slot section and the length direction of a second slot section. In this way, space can be saved, the space of a first auxiliary magnetic slot can be made more compact, and thus a larger space can be provided for the arrangement of a first main magnetic slot. In this way, the area of the first main magnetic slot can be increased. In this way, on the premise of ensuring the reluctance torque and the iron core utilization rate, the area can be increased by increasing the magnet thickness of the first main magnetic slot. In this way, the magnetic field intensity inside the rotor can be enhanced, the magnetic resistance in the magnetic circuit can be reduced, and thus the torque power of the rotor can be improved.

[0004] The utility model further provides a motor.

[0005] The utility model also provides a vehicle.

[0006] The rotor of the motor according to the first aspect embodiment of the utility model includes: a rotor core, the rotor core is provided with a plurality of circumferentially spaced magnetic poles, the magnetic poles include a plurality of magnetic slot rows radially spaced along the rotor core, the plurality of magnetic slot rows include a first magnetic slot row, the first magnetic slot row includes a first main magnetic slot and a first auxiliary magnetic slot, the first main magnetic slots are respectively located on opposite sides of the first auxiliary magnetic slot, the first auxiliary magnetic slot includes: a first slot section and a second slot section, and an included angle α exists between the length direction of the first slot section and the length direction of the second slot section; a plurality of magnets, the plurality of magnets are respectively arranged in the first main magnetic slot, the first slot section and the second slot section and are spaced apart from each other.

[0007] Thus, there is an included angle between the length direction of the first slot section and the length direction of the second slot section in the rotor of the motor, which can save space, make the space of the first auxiliary magnetic slot more compact, and thus provide a larger space for the arrangement of the first main magnetic slot, so as to increase the area of the first main magnetic slot. In this way, while ensuring the reluctance torque and the iron core utilization rate, the area can be increased by increasing the magnet thickness of the first main magnetic slot, which can enhance the magnetic field strength inside the rotor and reduce the magnetic resistance in the magnetic circuit, thereby improving the torque power of the rotor.

[0008] According to some embodiments of the present invention, the included angle α satisfies the relational expression: , being the number of pole pairs of the motor.

[0009] According to some embodiments of the present invention, there is an included angle between the first main magnetic slots located on the opposite sides of the first auxiliary magnetic slot, and the included angle satisfies the relational expression: , being the number of pole pairs of the motor.

[0010] According to some embodiments of the present invention, the center line of the first auxiliary magnetic slot extends along the radial direction of the rotor core, and the first slot section and the second slot section are symmetrically distributed with respect to the center line of the first auxiliary magnetic slot; and / or the first main magnetic slots located on the opposite sides of the first auxiliary magnetic slot are symmetrically distributed with respect to the center line of the first auxiliary magnetic slot.

[0011] According to some embodiments of the present invention, there are multiple first magnetic slot rows, and in the direction extending from the radial outer side to the radial inner side of the rotor core, the thickness of the magnets in the first slot section increases; and / or in the direction extending from the radial outer side to the radial inner side of the rotor core, the thickness of the magnets in the second slot section increases.

[0012] According to some embodiments of the present invention, the minimum value of the thicknesses of the multiple magnets is , satisfies the relational expression: , being the number of the magnetic slot rows, and the minimum distance from the intersection point of the center line of the first auxiliary magnetic slot and the outer peripheral edge of the rotor core to the radially extending edge of the magnetic pole is L MN .

[0013] According to some embodiments of the present invention, the distance between two adjacent magnetic slot rows is , and the minimum value of the thicknesses of the multiple magnets is , and Satisfy the relational expression: .

[0014] According to some embodiments of the present utility model, the thickness of the magnet in the first main magnetic slot located at the innermost radial position of the rotor core is , and the minimum value of the thicknesses of the plurality of magnets is , and Satisfy the relational expression: ; and / or the thickness of the magnet in the first secondary magnetic slot located at the innermost radial position of the rotor core is , and the minimum value of the thicknesses of the plurality of magnets is , and Satisfy the relational expression: .

[0015] According to some embodiments of the present utility model, a first reinforcing rib is provided between the first slot section and the second slot section in the first secondary magnetic slot located at the innermost radial position of the rotor core.

[0016] According to some embodiments of the present utility model, the rotor core is provided with weight-reducing holes, and the weight-reducing holes are located outside the magnetic poles in the radial direction of the rotor core.

[0017] According to some embodiments of the present utility model, along the direction extending from the inner radial side to the outer radial side of the rotor core, the minimum distance between the magnetic slot rows and the outer peripheral edge of the rotor core increases.

[0018] According to some embodiments of the present utility model, the number of the magnetic slot rows is , Satisfy the relational expression: .

[0019] According to some embodiments of the present utility model, the magnet is a ferrite permanent magnet.

[0020] According to some embodiments of the present utility model, the plurality of magnetic slot rows further include: a second magnetic slot row, the second magnetic slot row is located outside the first magnetic slot row in the radial direction of the rotor core, the second magnetic slot row includes a second main magnetic slot and a second secondary magnetic slot, the second main magnetic slots are respectively located on opposite sides of the second secondary magnetic slot, the length direction of the second secondary magnetic slot is perpendicular to the center line of the first secondary magnetic slot, and the plurality of magnets are respectively disposed in the second main magnetic slot and the second secondary magnetic slot, and the magnets in the first main magnetic slot and the magnets in the second main magnetic slot are parallel to each other.

[0021] According to some embodiments of the present utility model, the plurality of magnetic slot rows further include: a third magnetic slot row, the third magnetic slot row is located outside the second magnetic slot row in the radial direction of the rotor core, the third magnetic slot row includes two third main magnetic slots, the two third main magnetic slots are communicated, and the plurality of magnets are respectively disposed in the third main magnetic slots, and the magnets located in the second main magnetic slot and the magnets located in the third main magnetic slot are parallel to each other.

[0022] According to some embodiments of the present utility model, in the arrangement direction from the third main magnetic slot to the first main magnetic slot, the thickness of the magnet increases.

[0023] According to some embodiments of the present utility model, in the first magnetic slot row, second reinforcing ribs are provided between the first main magnetic slot and the first sub-magnetic slot, and between the second main magnetic slot and the second sub-magnetic slot.

[0024] According to some embodiments of the present utility model, the first magnetic slot row is plural, and in the arrangement direction from the first magnetic slot row to the plurality of second magnetic slot rows, the width of the second reinforcing rib decreases.

[0025] The motor according to the second aspect embodiment of the present utility model includes: the rotor of the above-mentioned motor.

[0026] The vehicle according to the third aspect embodiment of the present utility model includes: the above-mentioned motor.

[0027] The additional aspects and advantages of the present utility model will be partially given in the following description, partially will become obvious from the following description, or will be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0029] Figure 1 is a partial structural schematic diagram of a rotor core according to an embodiment of the present utility model;

[0030] Figure 2 is a structural schematic diagram of a rotor core including a second magnetic slot row according to an embodiment of the present utility model;

[0031] Figure 3 is a structural schematic diagram of a rotor core including a third magnetic slot row according to an embodiment of the present utility model.

[0032] Reference numerals:

[0033] 100. Rotor of the motor;

[0034] 10. Rotor core; 101. Magnetic pole; 11. Magnetic slot row; 12. Weight reduction hole;

[0035] 20. First magnetic slot row; 21. First main magnetic slot; 22. First auxiliary magnetic slot; 221. First slot section; 222. Second slot section;

[0036] 30. Magnet;

[0037] 40. First reinforcing rib;

[0038] 50. Second magnetic slot row; 51. Second main magnetic slot; 52. Second auxiliary magnetic slot;

[0039] 60. Third magnetic slot row; 61. Third main magnetic slot;

[0040] 70. Second reinforcing rib. Detailed implementation manners

[0041] The embodiments of the present utility model will be described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present utility model will be described in detail below.

[0042] Below, refer to Figures 1 - 3 to describe the rotor 100 of the motor according to the embodiments of the present utility model.

[0043] Refer to Figures 1 - 3 As shown, the rotor 100 of the motor according to the first aspect embodiment of the present utility model includes: a rotor core 10 and a plurality of magnets 30. The rotor core 10 is provided with a plurality of circumferentially distributed magnetic poles 101. The magnetic poles 101 include a plurality of magnetic slot rows 11 spaced radially along the rotor core 10. The plurality of magnetic slot rows 11 include a first magnetic slot row 20. The first magnetic slot row 20 includes a first main magnetic slot 21 and a first auxiliary magnetic slot 22. The first main magnetic slot 21 is respectively located on opposite sides of the first auxiliary magnetic slot 22. The first auxiliary magnetic slot 22 includes: a first slot section 221 and a second slot section 222. There is an included angle α between the length direction of the first slot section 221 and the length direction of the second slot section 222. At least a part of the plurality of magnets 30 are respectively arranged in the first main magnetic slot 21, the first slot section 221 and the second slot section 222, and the plurality of magnets 30 are spaced apart from each other.

[0044] Specifically, the reluctance torque utilization rate of the rotor of the traditional motor is insufficient, the number of magnetic barriers is small, the loss power of the motor is large, and moreover, the magnetic field intensity on the rotor core is insufficient, reducing the torque of the motor rotor.

[0045] The rotor 100 of the motor mainly consists of a rotor core 10 and a plurality of magnets 30. The rotor core 10 is provided with a plurality of circumferentially spaced magnetic poles 101. For example, the rotor core 10 can be composed of six magnetic poles 101, which can reduce eddy current losses and make the magnetic flux more evenly distributed around the rotor core 10, thereby avoiding local overheating of the rotor core 10.

[0046] The magnetic slot rows 11 are arranged radially along the rotor core 10, which can make the electromagnetic force distribution of the rotor core 10 more uniform and also improve the torque of the rotor core 10.

[0047] Moreover, the first main magnetic slot 21 and the first auxiliary magnetic slot 22 of the first magnetic slot row 20 among the plurality of magnetic slot rows 11 are arranged at intervals, and the first main magnetic slot 21 is respectively located on opposite sides of the first auxiliary magnetic slot 22, which can improve the symmetry of the magnetic circuit, reduce the magnetic field non-uniformity, improve the magnetic flux distribution, and thus improve the efficiency and performance of the motor.

[0048] Furthermore, the first auxiliary magnetic slot 22 mainly consists of a first slot section 221 and a second slot section 222, and there is an included angle between the length direction of the first slot section 221 and the length direction of the second slot section 222. In this way, while ensuring the reluctance torque and the iron core utilization rate, the thickness of the magnet 30 in the first main magnetic slot 21 can be increased, thereby improving the torque power of the rotor.

[0049] Moreover, at least a part of the magnets 30 are respectively arranged in the first main magnetic slot 21, the first slot section 221 and the second slot section 222. In this way, the magnetic field intensity inside the rotor can be enhanced, and the magnetic flux density of the motor can also be improved, thereby enhancing the overall performance of the motor. Filling the first main magnetic slot 21, the first slot section 221 and the second slot section 222 with magnets 30 can reduce the magnetic resistance in the magnetic circuit, thereby improving the energy conversion efficiency of the motor and reducing losses.

[0050] Therefore, there is an included angle between the length direction of the first slot section 221 and the length direction of the second slot section 222 in the rotor 100 of the motor, which can save space, make the space of the first auxiliary magnetic slot 22 more compact, thereby providing a larger space for the arrangement of the first main magnetic slot 21, increasing the area of the first main magnetic slot 21. In this way, while ensuring the reluctance torque and the iron core utilization rate, the area can be increased by increasing the thickness of the magnet 30 in the first main magnetic slot 21, which can enhance the magnetic field intensity inside the rotor, reduce the magnetic resistance in the magnetic circuit, and thus improve the torque power of the rotor.

[0051] According to some embodiments of the present invention, as Figure 1 shown, the included angle α satisfies the relationship: , where p is the number of pole pairs of the motor.

[0052] Wherein, an included angle α is formed between the length direction of the first slot section 221 and the length direction of the second slot section 222, and the maximum value of the included angle α does not exceed , thus, the space of the first auxiliary magnetic slot 22 can be reduced, so as to provide installation space for the arrangement of the first main magnetic slot 21. To increase the arrangement space of the first main magnetic slot 21, the thickness of the first main magnetic slot 21 can be increased, thereby increasing the intensity of the magnetic field inside the rotor and reducing the magnetic resistance.

[0053] In addition, the minimum value of the included angle α is greater than , so as to ensure the magnet occupancy ratio of the first auxiliary magnetic slot 22, and thus ensure the utilization rate of the magnets in the first auxiliary magnetic slot 22.

[0054] According to some embodiments of the present invention, as Figure 1 shown, there is an included angle between the first main magnetic slots 21 located on the opposite sides of the first auxiliary magnetic slot 22, and the included angle satisfies the relational expression: , where

[0055] is the number of pole pairs of the motor. Wherein, there is an included angle

[0056] between the first main magnetic slots 21 on the opposite sides, so as to increase the space utilization rate of the magnetic field of the first main magnetic slot 21, and thus further increase the magnetic field intensity of the first main magnetic slot 21. In addition, the maximum value of the included angle does not exceed , so as to ensure the magnetic flux concentrating effect between the first main magnetic slots 21 on the opposite sides of the first auxiliary magnetic slot 22, and thus ensure the iron core utilization rate of the first main magnetic slot 21. The minimum value of the included angle is greater than

[0057] According to some embodiments of the present invention, as Figure 1 shown, the center line of the first auxiliary magnetic slot 22 extends along the radial direction of the rotor core 10, the first slot section 221 and the second slot section 222 are symmetrically distributed about the center line of the first auxiliary magnetic slot 22, and / or the first main magnetic slots 21 located on the opposite sides of the first auxiliary magnetic slot 22 are symmetrically distributed about the center line of the first auxiliary magnetic slot 22.

[0058] Among them, the first slot section 221 and the second slot section 222 are symmetrically distributed with respect to the center line of the first auxiliary magnetic slot 22. This can improve the symmetry of the magnetic circuit between the first slot section 221 and the second slot section 222, and can also reduce the magnetic field non-uniformity between the first slot section 221 and the second slot section 222, thereby improving the magnetic flux distribution between the first slot section 221 and the second slot section 222. By optimizing the magnetic field distribution between the first slot section 221 and the second slot section 222, the starting torque can be increased, the starting current can be reduced, and the motor can be made more stable and reliable during startup.

[0059] Moreover, the first slot section 221 and the second slot section 222 are symmetrically distributed with respect to the center line of the first auxiliary magnetic slot 22, which can reduce the unbalanced torque, thereby reducing vibration and noise, and can also improve the running stability and comfort of the motor.

[0060] In addition, the first main magnetic slot 21 is symmetrically distributed with respect to the center line of the first auxiliary magnetic slot 22. Similarly, the symmetry on both circumferential sides of the first auxiliary magnetic slot 22 can be improved, and the magnetic field non-uniformity of the first main magnetic slot 21 on both sides of the first auxiliary magnetic slot 22 can also be reduced, thereby improving the magnetic flux distribution of the first main magnetic slot 21. By optimizing the magnetic field distribution of the first main magnetic slot 21, the starting torque can be further increased, the starting current can be reduced, and the unbalanced torque of the rotor can be further reduced, and vibration and noise can be reduced.

[0061] According to some embodiments of the present invention, as Figure 1 shown, there are multiple first magnetic slot rows 20. In the direction extending from the radially outer side to the radially inner side of the rotor core 10, the thickness of the magnets 30 in the first slot section 221 increases, and / or in the direction extending from the radially outer side to the radially inner side of the rotor core 10, the thickness of the magnets 30 in the second slot section 222 increases.

[0062] Among them, in the direction extending from the radially outer side to the radially inner side of the rotor core 10, the thickness of the magnets 30 in the first slot section 221 increases. In this way, the magnetic field strength at the first slot section 221 can be increased, thereby avoiding the demagnetization phenomenon caused by excessive temperature in the first slot section 221, and the torque output at the first slot section 221 can also be improved.

[0063] In addition, in the direction extending from the radially outer side to the radially inner side of the rotor core 10, the thickness of the magnets 30 in the second slot section 222 increases, which can increase the magnetic field strength at the second slot section 222, thereby avoiding the demagnetization phenomenon caused by excessive temperature in the second slot section 222, and the torque output at the second slot section 222 can also be improved.

[0064] According to some embodiments of the present invention, as Figure 2 shown, the minimum value of the thickness of the multiple magnets 30 is , Satisfy the relational expression: , where L MN is the number of magnetic slot rows 11, and the minimum distance from the intersection point of the center line of the first pair of magnetic slots 22 and the outer peripheral edge of the rotor core 10 to the radially extending edge of the magnetic pole 101 is

[0065] In this way, the minimum thickness of the magnet 30 can be guaranteed to satisfy the distribution of multiple magnetic slot rows 11 and the condition of the included angle formed by the first slot section 221 and the second slot section 222 in the first pair of magnetic slots 22. For example, when the total thickness of the accommodable magnets 30 is greater than 13 mm, two magnets with an included angle of α are placed in the first pair of magnetic slots 22; when the total thickness of the accommodable magnets 30 is less than 13 mm, one magnet perpendicular to the radial direction is placed in the first pair of magnetic slots 22.

[0066] According to some embodiments of the present invention, as Figure 2 shown, the distance between two adjacent magnetic slot rows 11 is , and the minimum value of the thickness of multiple magnets 30 is , and satisfy the relational expression: .

[0067] Among them, the distance between two adjacent magnetic slot rows 11 is less than the minimum thickness of the magnet

[0068] . In this way, the density of the magnetic field distribution between the magnetic slot rows 11 can be increased, and the magnetic field strength of the rotor can be further improved, so that the overall torque of the rotor can be increased and the loss of the motor can be reduced. Also, the distance between two adjacent magnetic slot rows 11 is

[0069] greater than Figure 3 shown, the thickness of the magnet 30 in the first main magnetic slot 21 located at the innermost radial position of the rotor core 10 is , and the minimum value of the thickness of multiple magnets 30 is , and satisfy the relational expression: , and / or the thickness of the magnet 30 in the first pair of magnetic slots 22 located at the innermost radial position of the rotor core 10 is , and the minimum value of the thickness of multiple magnets 30 is , and Satisfy the relational expression: .

[0070] Among them, the thickness of the magnet in the first main magnetic slot 21 at the innermost radial side of the rotor core 10 is greater than the minimum thickness of the magnet . In this way, the magnetic field intensity of the first main magnetic slot 21 at the innermost radial side of the rotor core 10 can be increased.

[0071] Furthermore, the thickness of the magnet in the first auxiliary magnetic slot 22 at the innermost radial side of the rotor core 10 is greater than the minimum thickness of the magnet , and moreover, the thickness of the magnet in the first auxiliary magnetic slot 22 at the innermost radial side of the rotor core 10 is also greater than the thickness of the magnet in the first main magnetic slot 21 at the innermost radial side of the rotor core 10 . In this way, the weight of the whole rotor can be redistributed. Since the centrifugal force on the outer side in the radial direction of the rotor core 10 is relatively large during rotation, therefore, the thickness of the magnet in the first main magnetic slot 21 on the outer side in the radial direction of the rotor core 10 is reduced, so that the stress of the rotor core 10 can be reduced, and the phenomenon of demagnetization caused by too high temperature in the innermost first auxiliary magnetic slot 22 can also be avoided.

[0072] According to some embodiments of the present invention, as Figure 1 shown, a first reinforcing rib 40 is provided between a first slot section 221 and a second slot section 222 in the first auxiliary magnetic slot 22 at the innermost radial side of the rotor core 10.

[0073] Among them, the first reinforcing rib 40 separates the first slot section 221 and the second slot section 222, so that the strength between the first slot section 221 and the second slot section 222 can be improved, and thus the stability of the rotor core 10 during rotation can be improved.

[0074] According to some embodiments of the present invention, as Figure 1 shown, the rotor core 10 is provided with a weight reduction hole 12, and the weight reduction hole 12 is located outside the magnetic pole 101 in the radial direction of the rotor core 10.

[0075] Among them, without affecting the electromagnetic performance of the rotor, a weight reduction hole 12 is opened on the outer side in the radial direction of the rotor core 10, which can greatly reduce the stress. Further, since the centrifugal force is relatively large near the outer circumference of the rotor core 10, the total weight of the rotor can be effectively reduced. Since the light rotor can reduce the inertial force during rotation, the energy consumption can be reduced and the dynamic response can be improved. At the same time, oil can pass through the weight reduction hole 12, so that the heat dissipation performance of the rotor can be enhanced.

[0076] According to some embodiments of the present invention, as Figure 1As shown, along the direction extending from the radially inner side to the radially outer side of the rotor core 10, the minimum distance between the magnetic slot rows 11 and the outer peripheral edge of the rotor core 10 increases.

[0077] Among them, the minimum distance between the magnetic slot rows 11 and the outer peripheral edge of the rotor core 10 increases, which can avoid the demagnetization-prone area, reduce the magnetic field interference of the magnets 30 in the adjacent magnetic slot rows 11, improve the uniformity of the magnetic field distribution of the motor, reduce the magnetic field leakage, and thus improve the efficiency and performance of the motor.

[0078] In addition, the minimum distance between the magnetic slot rows 11 and the outer peripheral edge of the rotor core 10 increases, which can enhance the mechanical strength of the rotor. A larger distance can provide more material support, thereby reducing the vibration and deformation of the rotor during high-speed rotation and enhancing its stability and reliability.

[0079] According to some embodiments of the present invention, the number of the magnetic slot rows 11 is , satisfying the relationship: .

[0080] Among them, the number of the magnetic slot rows 11 can be set to 4 rows, 5 rows, and 6 rows. According to the test results, when the number of pole pairs of the motor is 6, when the number of the magnetic slot rows 11 is set to 4 rows, or 5 rows, or 6 rows, the torque is significantly increased. When the number of the magnetic slot rows 11 continues to increase, the torque increase is small. Therefore, when the number of the magnetic slot rows 11 is set to 4 rows, or 5 rows, or 6 rows, the reluctance torque of the motor can be fully utilized.

[0081] According to some embodiments of the present invention, as Figure 2 shown, the plurality of magnetic slot rows 11 further includes: a second magnetic slot row 50. The second magnetic slot row 50 is located outside the first magnetic slot row 20 in the radial direction of the rotor core 10. The second magnetic slot row 50 includes a second main magnetic slot 51 and a second sub-magnetic slot 52. The second main magnetic slots 51 are respectively located on opposite sides of the second sub-magnetic slot 52. The length direction of the second sub-magnetic slot 52 is perpendicular to the center line of the first sub-magnetic slot 22. The plurality of magnets 30 are also respectively arranged in the second main magnetic slot 51 and the second sub-magnetic slot 52. The magnets 30 located in the first main magnetic slot 21 and the magnets 30 located in the second main magnetic slot 51 are parallel to each other.

[0082] Among them, the second main magnetic slots 51 are located on both sides of the second sub-magnetic slot 52. In this way, symmetry can be formed between the second main magnetic slot 51 and the second sub-magnetic slot 52. The magnets 30 in the first main magnetic slot 21 and the magnets 30 in the second main magnetic slot 51 are parallel to each other, so that the magnetic field distribution between the second main magnetic slot 51 and the second sub-magnetic slot 52 can be more uniform.

[0083] Further, the length direction of the second pair of magnetic slots 52 is perpendicular to the center line of the first pair of magnetic slots 22, so that the magnetic field distribution between the second pair of magnetic slots 52 and the first pair of magnetic slots 22 can be made more uniform.

[0084] According to some embodiments of the present invention, as Figure 3 shown, the plurality of magnetic slot rows 11 further includes: a third magnetic slot row 60, the third magnetic slot row 60 is located outside the second magnetic slot row 50 in the radial direction of the rotor core 10, the third magnetic slot row 60 includes two third main magnetic slots 61, the two third main magnetic slots 61 are communicated, and the plurality of magnets 30 are respectively arranged in the third main magnetic slots 61. The magnets 30 located in the second main magnetic slot 51 and the magnets 30 located in the third main magnetic slot 61 are parallel to each other.

[0085] Among them, the third magnetic slot row 60 is mainly composed of two third main magnetic slots 61, the two third main magnetic slots 61 are communicated, and a gap is formed between the two third main magnetic slots 61, which can not only avoid the influence between the two third main magnetic slots 61, but also allow oil to pass through the gap for cooling and heat dissipation, and can also reduce the weight of the rotor.

[0086] Furthermore, the magnets 30 in the second main magnetic slot 51 and the magnets 30 in the third main magnetic slot 61 are parallel to each other, so that the magnetic field distribution between the second main magnetic slot 51 and the third main magnetic slot 61 can be made more uniform.

[0087] According to some embodiments of the present invention, as Figure 3 shown, in the arrangement direction from the third main magnetic slot 61 to the first main magnetic slot 21, the thickness of the magnet 30 increases. In this way, the magnetic field intensity of the rotor core 10 can be gradually increased, and the occurrence of demagnetization phenomenon can be reduced.

[0088] According to some embodiments of the present invention, as Figure 1 shown, in the first magnetic slot row 20, second reinforcing ribs 70 are provided between the first main magnetic slot 21 and the first pair of magnetic slots 22, and between the second main magnetic slot 51 and the second pair of magnetic slots 52.

[0089] Among them, the arrangement of the second reinforcing ribs 70 between the first main magnetic slot 21 and the first pair of magnetic slots 22 can improve the strength between the first main magnetic slot 21 and the first pair of magnetic slots 22. Similarly, the arrangement of the second reinforcing ribs 70 between the second main magnetic slot 51 and the second pair of magnetic slots 52 can improve the strength between the second main magnetic slot 51 and the second pair of magnetic slots 52.

[0090] According to some embodiments of the present invention, as Figure 2 shown, there are a plurality of first magnetic slot rows 20, and in the arrangement direction from the first magnetic slot rows 20 to the plurality of second magnetic slot rows 50, the width of the second reinforcing ribs 70 decreases.

[0091] Among them, since the stress closer to the inner side along the radial direction of the rotor is greater, the width of the second reinforcing rib 70 is set wider, so as to further improve the strength of the rotor and make the rotor more stable during rotation. The width of the second reinforcing rib 70 gradually decreases in the arrangement direction from the first magnetic slot row 20 to the plurality of second magnetic slot rows 50, and its ratio satisfies , , , and . Among them, W1 is the width of the second reinforcing rib between the first auxiliary magnetic slot 22 and the first main magnetic slot 21, and W2, W3, and W4 are all the widths of the second reinforcing rib 70 between the second auxiliary magnetic slot 52 and the second main magnetic slot 51. The widths of the second reinforcing ribs 70 of W2, W3, and W4 decrease in sequence, and W5 is the width of the first reinforcing rib 40 between the first slot section 221 and the second slot section 222. In this way, the strength of the rotor can be improved.

[0092] According to some embodiments of the present invention, the magnet 30 is a ferrite permanent magnet

[0093] Among them, compared with using rare earth permanent magnets for the magnet 30, the ferrite permanent magnet has the advantages of high magnetic performance, good temperature stability, corrosion resistance, easy processing, and low cost.

[0094] The motor according to the second aspect embodiment of the present invention includes: the rotor 100 of the motor in the above embodiment.

[0095] The vehicle according to the third aspect embodiment of the present invention includes: the motor in the above embodiment.

[0096] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0097] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0098] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A rotor (100) of an electric motor, characterized in that: include: A rotor core (10), the rotor core (10) being provided with a plurality of circumferentially distributed magnetic poles, the magnetic poles comprising a plurality of magnetic slot rows (11) spaced radially along the rotor core (10), the plurality of magnetic slot rows (11) comprising a first magnetic slot row (20), the first magnetic slot row (20) comprising a first main magnetic slot (21) and a first secondary magnetic slot (22), the first main magnetic slot (21) being respectively located on two opposite sides of the first secondary magnetic slot (22), the first secondary magnetic slot (22) comprising a first slot segment (221) and a second slot segment (222), the length direction of the first slot segment (221) and the length direction of the second slot segment (222) forming an angle α; A plurality of magnets (30), at least a portion of the magnets (30) are respectively arranged in the first main magnetic slot (21), the first slot section (221) and the second slot section (222) and are spaced apart from each other.

2. The rotor of the motor according to claim 1, characterized in that: The angle α satisfies the relationship: , is the number of pole pairs of the motor.

3. The rotor (100) of the electric machine according to claim 1, characterized in that: The first main magnetic grooves (21) located on opposite sides of the first auxiliary magnetic groove (22) have an angle , the angle Satisfies the relationship: , is the number of pole pairs of the motor.

4. The rotor (100) of the electric machine according to claim 1, characterized in that: The center line of the first secondary magnetic slot (22) extends in the radial direction of the rotor core (10), and the first slot segment (221) and the second slot segment (222) are symmetrically distributed about the center line of the first secondary magnetic slot (22); and / or The first main magnetic grooves (21) located on opposite sides of the first secondary magnetic groove (22) are symmetrically distributed about a center line of the first secondary magnetic groove (22).

5. The rotor (100) of the electric machine according to claim 1, characterized in that: There are a plurality of first magnetic slot rows (20), and in a direction extending from the radial outer side to the radial inner side of the rotor core (10), the thickness of the magnets (30) in the first slot segments (221) increases gradually; and / or In a direction extending from the radial outer side to the radial inner side of the rotor core (10), the thickness of the magnet (30) in the second slot section (222) increases gradually.

6. The rotor (100) of the electric machine according to claim 1, characterized in that: The minimum thickness of the plurality of magnets (30) is , Satisfies the relationship: , is the number of the magnetic slot rows (11), and the minimum distance from the intersection of the center line of the first secondary magnetic slot (22) and the outer peripheral edge of the rotor core (10) to the radially extending edge of the magnetic pole is L. MN .

7. The rotor (100) of the electric machine according to claim 1, characterized in that: The distance between two adjacent magnetic slot rows (11) is The minimum thickness of the plurality of magnets (30) is , and Satisfies the relationship: 。 8. The rotor (100) of the electric machine according to claim 1, characterized in that: The thickness of the magnet (30) in the first main magnetic slot (21) located at the radially innermost side of the rotor core (10) is The minimum thickness of the plurality of magnets (30) is , and Satisfies the relationship: ; and / or The thickness of the magnet (30) in the first secondary magnetic slot (22) located at the radially innermost side of the rotor core (10) is The minimum thickness of the plurality of magnets (30) is , and Satisfies the relationship: .

9. The rotor (100) of the electric machine according to claim 1, characterized in that: A first reinforcing rib (40) is provided between the first slot segment (221) and the second slot segment (222) in the first secondary magnetic slot (22) located at the radially innermost side of the rotor core (10).

10. The rotor (100) of the electric machine according to claim 1, characterized in that: The rotor core (10) is provided with a weight-reducing hole (12), and the weight-reducing hole (12) is located outside the magnetic pole in the radial direction of the rotor core (10).

11. The rotor (100) of the electric machine according to claim 1, characterized in that: Along the direction extending from the radial inner side to the radial outer side of the rotor core (10), the minimum distance between the magnetic slot row (11) and the outer peripheral edge of the rotor core (10) increases gradually.

12. The rotor (100) of the electric machine according to claim 1, characterized in that The number of the magnetic slot rows (11) is , Satisfies the relationship: .

13. The rotor (100) of the electric machine according to claim 1, characterized in that: The magnet (30) is a ferrite permanent magnet.

14. The rotor (100) of the electric machine according to any one of claims 1 to 13, characterized in that: The plurality of magnetic slot rows (11) further include: A second magnetic slot row (50), the second magnetic slot row (50) is located outside the first magnetic slot row (20) in the radial direction of the rotor core (10), the second magnetic slot row (50) comprises a second main magnetic slot (51) and a second auxiliary magnetic slot (52), the second main magnetic slot (51) is located on opposite sides of the second auxiliary magnetic slot (52), the length direction of the second auxiliary magnetic slot (52) is perpendicular to the center line of the first auxiliary magnetic slot (22), at least a part of the magnets (30) are respectively arranged in the second main magnetic slot (51) and the second auxiliary magnetic slot (52), and the magnets (30) located in the first main magnetic slot (21) and the magnets (30) located in the second main magnetic slot (51) are parallel to each other.

15. The rotor (100) of the electric machine according to claim 14, characterized in that: The plurality of magnetic slot rows (11) further include: A third magnetic slot row (60), the third magnetic slot row (60) is located outside the second magnetic slot row (50) in the radial direction of the rotor core (10), the third magnetic slot row (60) comprises two third main magnetic slots (61), the two third main magnetic slots (61) are connected, at least a portion of the magnets (30) are respectively arranged in the third main magnetic slots (61), and the magnets (30) located in the second main magnetic slots (51) and the magnets (30) located in the third main magnetic slots (61) are parallel to each other.

16. The rotor (100) of the electric machine according to claim 15, characterized in that: In the arrangement direction from the third main magnetic groove (61) to the first main magnetic groove (21), the thickness of the magnet (30) increases gradually.

17. The rotor (100) of the electric machine according to claim 14, characterized in that: In the first magnetic slot row (20), second reinforcing ribs (70) are provided between the first main magnetic slot (21) and the first auxiliary magnetic slot (22), and between the second main magnetic slot (51) and the second auxiliary magnetic slot (52).

18. The rotor (100) of the electric machine according to claim 17, characterized in that: There are a plurality of first magnetic slot rows (20), and in an arrangement direction from the first magnetic slot rows (20) to the plurality of second magnetic slot rows (50), the width of the second reinforcing ribs (70) decreases gradually.

19. A motor, characterized in that: include: A rotor (100) for an electric machine according to any one of claims 1 to 18.

20. A vehicle, characterized in that: include: The motor of claim 19.

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