Motor rotor punching sheet and motor rotor

Abstract

The utility model provides a motor rotor punching sheet and a motor rotor, the motor rotor punching sheet comprises a punching sheet body and a plurality of magnetic steel accommodating groove groups arranged on the punching sheet body, the plurality of magnetic steel accommodating groove groups are sequentially arranged along the circumferential direction of the punching sheet body, and at least one group of adjusting structure is arranged in the area where each magnetic steel accommodating groove group is located. The multiple sets of adjusting structures are sequentially arranged in the circumferential direction of the punching sheet body, each adjusting structure comprises at least one first auxiliary groove and at least one second auxiliary groove, and the first auxiliary grooves and the second auxiliary grooves are formed in the outer diameter edge of the punching sheet body. The beneficial effects of the utility model are that electromagnetic force and torque pulsation of the rotor are reduced, noise and vibration in the operation process of the motor are further reduced, the NVH performance of the motor is improved, 24-order and 48-order radial forces can be effectively reduced, and the NVH problem of the motor is improved.

Description

Technical Field

[0001] This utility model belongs to the field of motor technology, and in particular relates to a motor rotor lamination and a motor rotor. Background Technology

[0002] Permanent magnet motors are increasingly being used in new energy vehicles. During high-speed rotation, the motor rotor is prone to vibration and noise due to electromagnetic forces and other factors, affecting the NVH performance of the entire motor system and impacting the overall driving experience. Traditional motor rotor lamination designs often focus on optimizing electromagnetic performance, with relatively insufficient consideration for NVH performance, resulting in significant noise and vibration issues during motor operation. Currently, conventional rotor structure motors have been found to exhibit 48th-order noise at high speeds and 24th-order noise at low speeds in actual bench NVH tests, affecting the overall driving experience. Therefore, optimization of the rotor laminations is necessary. Summary of the Invention

[0003] In view of the above problems, the present invention provides a motor rotor lamination and a motor rotor to solve the above or other problems existing in the prior art.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a motor rotor lamination, including a lamination body and a plurality of magnet receiving slots arranged on the lamination body. The plurality of magnet receiving slots are arranged sequentially along the circumferential direction of the lamination body. In the area where each magnet receiving slot is located, at least one set of adjustment structure is provided. The plurality of adjustment structures are arranged sequentially along the circumferential direction of the lamination body. The adjustment structure includes at least one first type of auxiliary slot and at least one second type of auxiliary slot. Both the first type of auxiliary slot and the second type of auxiliary slot are located at the outer diameter edge of the lamination body.

[0005] Furthermore, the adjustment structure also includes at least one auxiliary hole, which is located between the magnet receiving groove and the outer diameter edge of the lamination body.

[0006] Furthermore, in each set of adjustment structures, along the circumferential direction of the lamination body, the first type of auxiliary groove, the second type of auxiliary groove, and the auxiliary hole are arranged sequentially.

[0007] Furthermore, the first type of auxiliary groove, the second type of auxiliary groove, and the auxiliary hole in the two adjacent sets of adjustment structures are all symmetrically arranged.

[0008] Furthermore, each of the two adjacent first-type auxiliary slots is located in the middle of the two adjacent magnetic poles.

[0009] Furthermore, along the circumferential direction of the lamination body, the depth of the first type of auxiliary groove along the radial direction of the lamination body gradually increases or gradually decreases. The two first type of auxiliary grooves at the intersection of the areas where two adjacent magnet receiving groove groups are located are symmetrically arranged, and the depth of the intersection of the two first type of auxiliary grooves is the maximum depth.

[0010] Furthermore, each magnet receiving slot group includes at least one set of symmetrically arranged magnet receiving slots, and multiple second-type auxiliary slots are provided between each set of symmetrically arranged magnet receiving slots, and the multiple second-type auxiliary slots are symmetrically arranged with respect to the axis of symmetry of the set of magnet receiving slots.

[0011] Furthermore, along the circumferential direction of the lamination body, the radial depth of the second type of auxiliary groove first increases and then decreases, and the maximum depth of the second type of auxiliary groove is asymmetrically arranged on both sides.

[0012] Furthermore, each set of symmetrically arranged magnet receiving slots includes a first magnet receiving slot, and along the radial direction of the lamination body, the end of the first magnet receiving slot near the inner diameter edge of the lamination body is provided with a first magnetic isolation groove.

[0013] Furthermore, along the circumferential direction of the lamination body, a second magnetic isolation groove is provided on one side of the first magnet receiving groove, and the second magnetic isolation groove corresponds to the corner of the magnet located in the first magnet receiving groove.

[0014] Furthermore, a magnetic bridge is provided between the end of the first magnet receiving groove near the outer diameter of the lamination body and the edge of the outer diameter of the lamination body.

[0015] Furthermore, each magnet receiving slot group includes multiple sets of magnet receiving slots arranged along the radial direction of the lamination body. Each set of magnet receiving slots is arranged in a V-shape or a U-shape symmetrical arrangement. Alternatively, in two adjacent sets of magnet receiving slots, one set of magnet receiving slots is arranged in a V-shape symmetrical arrangement and the other set of magnet receiving slots is arranged in a U-shape symmetrical arrangement.

[0016] An electric motor rotor includes multiple motor rotor laminations as described above, with the multiple motor rotor laminations arranged coaxially.

[0017] Due to the adoption of the above technical solution, within the area where a set of magnet receiving slots of the motor rotor lamination is located, a first type of auxiliary slot and a second type of auxiliary slot are provided on the outer diameter edge. The first type of auxiliary slot is used to optimize the high-speed main order electromagnetic force, and the second type of auxiliary slot is used to optimize the torque pulsation electromagnetic force in the constant torque region. An auxiliary hole is provided between the outer diameter edge and the magnet receiving slot group. The auxiliary hole is used to optimize the specific order electromagnetic force in the low-speed region. Furthermore, within the area where the set of magnet receiving slots is located, along the circumferential direction of the lamination body, the first type of auxiliary slot, the second type of auxiliary slot, and the auxiliary hole are arranged sequentially. The second type of auxiliary slot is located between the first type of auxiliary slots, and the auxiliary hole is located between the second type of auxiliary slots. The first type of auxiliary slot is located outside the magnet receiving slot group, and the second type of auxiliary slot and the auxiliary hole are located within the magnet receiving slot group. The inner side of the first magnet receiving slot is equipped with a magnetic bridge between the end of the first magnet receiving slot near the outer diameter edge of the lamination body and the outer diameter edge to isolate the magnets and optimize the electromagnetic force, thus ensuring the mechanical strength of the lamination. A second magnetic isolation slot is provided on the side wall of the first magnet receiving slot, which corresponds to the corner of the magnet to isolate the magnets and prevent the corner of the magnets from demagnetizing. The first magnetic isolation slot is provided at the end of the first magnet receiving slot near the inner diameter edge of the lamination body to isolate the magnets and ensure the mechanical strength of the lamination. This prevents the lamination from deforming during high-speed rotation of the rotor, reduces the electromagnetic force and torque pulsation of the rotor, thereby reducing the noise and vibration during motor operation, improving the NVH performance of the motor, and effectively reducing the 24th and 48th order radial forces, thus improving the NVH problem of the motor. Attached Figure Description

[0018] Figure 1 This is a partial structural schematic diagram of a rotor lamination according to an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the rotor lamination structure of one embodiment of the present invention.

[0020] In the picture:

[0021] 1. Type I auxiliary groove; 2. Type II auxiliary groove; 3. Auxiliary hole

[0022] 4. Magnetic bridge; 5. Second magnetic isolation groove; 6. First magnetic isolation groove

[0023] 7. Second magnet receiving groove; 8. First magnet receiving groove; 9. Lamination body Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0025] Figure 1The diagram shows a structural schematic of an embodiment of the present invention. This embodiment relates to a motor rotor lamination and a motor rotor. A first type of auxiliary groove and a second type of auxiliary groove are provided on the outer diameter edge of the lamination. An auxiliary hole and a magnetic bridge are provided between the outer diameter edge of the lamination and the magnet receiving groove. The structure of the magnet receiving groove is improved by providing a first magnetic isolation groove and a second magnetic isolation groove to reduce the electromagnetic force and torque pulsation of the rotor, thereby reducing the noise and vibration during motor operation and improving the NVH performance of the motor.

[0026] A type of motor rotor lamination, such as Figure 1 and 2 As shown, the device includes a lamination body 9 and multiple magnet receiving slots arranged on the lamination body 9. The multiple magnet receiving slots are arranged sequentially along the circumferential direction of the lamination body 9, with each magnet receiving slot occupying a certain area. The multiple magnet receiving slots are arranged at equal intervals along the circumferential direction of the lamination body 9, making the lamination structure symmetrical and stable, facilitating rotor assembly, and ensuring that the performance of the rotor composed of multiple rotor laminations meets the design requirements. The number of magnet receiving slots is selected according to actual needs and is not specifically required here. The lamination body 9 has an annular structure with an outer diameter edge and an inner diameter edge.

[0027] Each magnet receiving slot group is arranged along the radial direction of a lamination body 9, occupying a certain area in the radial direction. In the area where each magnet receiving slot group is located, at least one set of adjustment structures is provided. The setting of adjustment structures is used to adjust and optimize the electromagnetic force and torque pulsation of the rotor, thereby optimizing the NVH of the motor. Multiple sets of adjustment structures are arranged sequentially along the circumferential direction of the lamination body 9. Along the radial direction of the lamination body 9, multiple sets of adjustment structures are all set in the sub-region from the magnet receiving slot group to the outer diameter edge of the lamination body 9. Each adjustment structure is located at the outer diameter edge of the lamination body 9, and the structure at the outer diameter edge of the lamination body 9 is improved and optimized, thereby achieving the optimization of the electromagnetic force and torque pulsation of the rotor.

[0028] The adjustment structure includes at least one first type of auxiliary groove 1 and at least one second type of auxiliary groove 2. Both the first type of auxiliary groove 1 and the second type of auxiliary groove 2 are located at the outer diameter edge of the stamping body 9. The number of the first type of auxiliary groove 1 and the number of the second type of auxiliary groove 2 are selected according to actual needs, and no specific requirements are made here.

[0029] In a further optimized design, each adjustment structure can be located between the magnet receiving slot group and the outer diameter edge of the lamination body 9. The structure between these two points is improved and optimized to further optimize the electromagnetic force and torque pulsation of the rotor. In this configuration, the adjustment structure also includes at least one auxiliary hole 3, located between the magnet receiving slot group and the outer diameter edge of the lamination body 9. The number of auxiliary holes 3 is selected based on actual needs and is not specifically required here.

[0030] In each set of adjustment structures, along the circumferential direction of the lamination body 9, a first type of auxiliary groove 1, a second type of auxiliary groove 2, and an auxiliary hole 3 are arranged sequentially. That is, along the circumferential direction of the lamination body 9, at least one first type of auxiliary groove 1 and at least one second type of auxiliary groove 2 are arranged sequentially on the outer diameter edge of the lamination body 9. There is a certain distance between the multiple first type of auxiliary groove 1 and the multiple second type of auxiliary groove 2. This distance is selected and set according to the actual design requirements. The multiple auxiliary holes 3 are arranged on the side of the second type of auxiliary groove 2 away from the first type of auxiliary groove 1. There is a certain distance between the multiple auxiliary holes 3 and the multiple second type of auxiliary groove 2. This distance is selected and set according to the actual design requirements.

[0031] In two adjacent adjustment structures, the first type of auxiliary groove 1, the second type of auxiliary groove 2, and the auxiliary hole 3 are set in opposite directions. Along the radial direction of the lamination body 9, the arrangement of the first type of auxiliary groove 1, the second type of auxiliary groove 2, and the auxiliary hole 3 in these two adjustment structures is symmetrical. In one adjustment structure, along the first circumferential direction of the lamination body 9 (such as clockwise), the first type of auxiliary groove 1, the second type of auxiliary groove 2, and the auxiliary hole 3 are set in sequence. In the other adjustment structure, along the second circumferential direction of the lamination body 9 (such as counterclockwise), the first type of auxiliary groove 1, the second type of auxiliary groove 2, and the auxiliary hole 3 are set in sequence. That is, the corresponding first type of auxiliary groove 1 in these two adjustment structures is symmetrically set, the corresponding second type of auxiliary groove 2 is symmetrically set, and the corresponding auxiliary hole 3 is symmetrically set.

[0032] In some feasible embodiments, preferably, a set of adjustment structures includes a first type of auxiliary groove 1, a second type of auxiliary groove 2, and an auxiliary hole 3.

[0033] In some feasible embodiments, preferably, two adjacent first-type auxiliary slots 1 are located in the middle of two adjacent magnetic poles. The area where each magnet receiving slot group is located corresponds to a magnetic pole. The intersection of two adjacent magnetic poles is the middle position of the two magnetic poles. Two adjacent first-type auxiliary slots 1 are located in the middle position of two magnetic poles. That is, two adjacent first-type auxiliary slots 1 are located on the Q axis. In other words, a first-type receiving slot 1 is provided on one side of the area where each magnet receiving slot group is located and on one side of the area where another magnet receiving slot group is located near this area, so that two adjacent first-type receiving slots 1 are located in the middle position of the areas where two magnet receiving slot groups are located.

[0034] The first type of auxiliary groove 1 is set as an auxiliary groove for the Q-axis of the rotor to optimize the high-speed main order electromagnetic force, thereby optimizing the NVH of the motor. The first type of auxiliary groove 1 is a groove structure formed by the indentation from the outer diameter edge of the lamination body 9 towards the inner diameter. Along the circumferential direction of the lamination body 9, the depth of the first type of auxiliary groove 1 along the radial direction of the lamination body 9 gradually increases or decreases. The two first type of auxiliary grooves 1 at the intersection of the areas where two adjacent magnet receiving groove groups are located are symmetrically arranged, and the depth of the two first type of auxiliary grooves 1 at the intersection is the maximum depth. That is, the two first type of auxiliary grooves 1 located in the middle position of the two magnetic poles intersect, and the intersection position is the position where the depth of the two first type of auxiliary grooves 1 along the radial direction of the lamination body 9 is the maximum. Therefore, the auxiliary groove structure formed by these two intersecting and symmetrically arranged first type of auxiliary grooves 1 is a symmetrical structure, symmetrically arranged along the Q-axis, and the intersection is the position of maximum depth. The depth of this auxiliary groove structure along the circumferential direction of the lamination body 9 and the radial direction of the lamination body 9 first increases and then decreases.

[0035] Within the area of ​​each magnet receiving slot group, each magnet receiving slot group includes at least one symmetrically arranged magnet receiving slot. Multiple second-type auxiliary slots 2 are provided between each symmetrically arranged magnet receiving slot group, and the multiple second-type auxiliary slots 2 are symmetrically arranged with respect to the axis of symmetry of that magnet receiving slot group. Specifically, each magnet receiving slot group includes multiple magnet receiving slots for accommodating magnets. These multiple magnet receiving slots are arranged in multiple groups, sequentially along the circumferential direction of the lamination body 9. Along the circumferential direction of the lamination body 9, adjacent groups of magnet receiving slots are symmetrically arranged, forming multiple symmetrically arranged receiving slots. Each group of magnet receiving slots contains at least one magnet receiving slot, and the multiple magnet receiving slots in each group are sequentially arranged along the radial direction of the lamination body 9. Along the circumferential direction of the lamination body 9, a plurality of second-type auxiliary grooves 2 are provided at the outer diameter edge of the lamination body 9 corresponding to each group of symmetrically arranged magnet receiving grooves, and the plurality of second-type auxiliary grooves 2 are symmetrically arranged, and the axis of symmetry of the plurality of second-type auxiliary grooves 2 coincides with the axis of symmetry of the group of symmetrically arranged magnet receiving grooves.

[0036] The second type of auxiliary groove 2 is set as an auxiliary groove for the Q-axis of the rotor to optimize torque pulsation and electromagnetic force in the constant torque region, thereby optimizing the NVH of the motor. The second type of auxiliary groove 2 is a groove structure formed by the indentation from the outer diameter edge of the lamination body 9 towards the inner diameter. Along the circumferential direction of the lamination body 9, the depth of the second type of auxiliary groove 2 along the radial direction of the lamination body 9 first increases and then decreases. That is, the depth of the second type of auxiliary groove 2 is the largest in the middle and the depth is the smallest on both sides. Moreover, the two sides of the maximum depth of the second type of auxiliary groove 2 are asymmetrically arranged. The lengths of the two sides of the maximum depth of the second type of auxiliary groove 2 along the circumferential direction of the lamination body 9 are not the same, or the shapes of the groove walls on both sides of the maximum depth of the second type of auxiliary groove 2 along the circumferential direction of the lamination body 9 are not the same, such as one being a straight line and the other an arc. In other words, the depth variation law of the groove on both sides of the maximum depth of the second type of auxiliary groove 2 is not the same.

[0037] Each set of symmetrically arranged magnet receiving slots is provided with multiple auxiliary holes 3, and the multiple auxiliary holes 3 are symmetrically arranged with respect to the axis of symmetry of the set of magnet receiving slots. The distance between the multiple auxiliary holes 3 and the axis of symmetry is less than the distance between the multiple second-type auxiliary slots 2 and the axis of symmetry, that is, the auxiliary holes 3 are located between the second-type auxiliary slots 2.

[0038] Structurally, along the radial direction of the lamination body 9, each set of magnet receiving slots corresponds to at least one set of adjustment structures. That is, in the radial region where each set of magnet receiving slots is located, at least one set of adjustment structures is provided to optimize and improve the structure of the outer diameter edge and the part between the magnet receiving slot and the outer diameter edge in the radial region where each set of magnet receiving slots is located, thereby adjusting and optimizing the electromagnetic force and torque pulsation of the rotor.

[0039] In some feasible embodiments, preferably, each set of magnet receiving slots corresponds to a set of adjustment structures. Within the radial region of each set of magnet receiving slots, a set of adjustment structures is provided. This set of adjustment structures includes a first type of auxiliary slot 1, a second type of auxiliary slot 2, and an auxiliary hole 3. When the first type of auxiliary slot 1, the second type of auxiliary slot 2, and the auxiliary hole 3 in this set of adjustment structures are arranged along the circumferential direction of the lamination body 9, the first type of auxiliary slot 1 and the second type of auxiliary slot 2 are respectively provided on both sides of each set of magnet receiving slots. That is, the first type of auxiliary slot 1 and the second type of auxiliary slot 2 are respectively provided on the left and right sides (circumferential direction of the lamination body 9) of the set of magnet receiving slots. The auxiliary hole 3 is located on one side of the set of magnet receiving slots, and the auxiliary hole 3 is also located on the side of the second type of auxiliary slot 2 away from the set of magnet receiving slots.

[0040] The length and depth of the first type of auxiliary groove 1 and the length and depth of the second type of auxiliary groove 2 are selected and set according to actual needs, and no specific requirements are made here.

[0041] The auxiliary hole 3, serving as the Q-axis auxiliary hole for the rotor, is used to optimize specific-order electromagnetic forces in the low-speed range, thereby optimizing the motor's NVH (noise, vibration, and harshness). This auxiliary hole 3 is a through-hole structure, penetrating the lamination body 9. The shape of the auxiliary hole 3 can be circular, square, polygonal, or other shapes, selected according to actual needs; no specific requirements are specified here. The dimensions of the auxiliary hole 3 are also selected and set according to actual needs; no specific requirements are specified here.

[0042] Each magnet receiving slot group includes multiple sets of magnet receiving slots arranged along the radial direction of the stamping body 9. Each set contains multiple magnet receiving slots, which are arranged along the circumferential direction of the stamping body 9 and are symmetrically arranged. Each set of magnet receiving slots is arranged in a V-shape or a U-shape, or, in two adjacent sets of magnet receiving slots, one set is arranged in a V-shape and the other set is arranged in a U-shape. The arrangement of the magnet receiving slots in each set and the arrangement of the magnet receiving slots in two adjacent sets along the radial direction of the stamping body 9 are selected according to actual needs and are not specifically required here.

[0043] Further optimization of the scheme: each set of magnet receiving slots includes a first magnet receiving slot 8. Along the radial direction of the lamination body 9, a first magnetic isolation slot 6 is provided at one end of the first magnet receiving slot 8 near the inner diameter edge of the lamination body 9. The first magnetic isolation slot 6 is connected to the first magnet receiving slot 8. The first magnetic isolation slot 6 is provided to isolate magnetism and at the same time ensure the mechanical strength of the lamination, so that the rotor has good mechanical strength.

[0044] The first magnetic isolation groove 6 penetrates the lamination body 9, and its shape can be circular, elliptical, square, or other shapes, selected according to actual needs. In some feasible embodiments, the first magnetic isolation groove 6 includes a straight section and a curved section connected together. The other end of the straight section is connected to the side wall of the first magnet receiving groove 8, and the other end of the curved section is connected to the other side wall of the first magnet receiving groove 8, forming an irregularly shaped first magnetic isolation groove 6 structure. The curved section is preferably an arc-shaped structure.

[0045] Further optimizing the design, a second magnetic isolation groove 5 is provided on one side of the first magnet receiving groove 8 along the circumferential direction of the lamination body 9. The second magnetic isolation groove 5 corresponds to the corner of the magnet located in the first magnet receiving groove 8. The second magnetic isolation groove 5 is formed by a recess in the side wall of the first magnet receiving groove 8. The second magnetic isolation groove 5 is provided to isolate magnetism and prevent demagnetization of the magnet corner. The second magnetic isolation groove 5 is connected to the first magnetic isolation groove 6, and one end of the second magnetic isolation groove 5 is connected to the straight part of the first magnetic isolation groove 6.

[0046] To further optimize the design, a magnetic bridge 4 is provided between the end of the first magnet receiving groove 8 near the outer diameter of the lamination body 9 and the edge of the outer diameter of the lamination body 9. The magnetic bridge 4 is used to isolate the magnetism, optimize the electromagnetic force, and ensure the mechanical strength of the lamination, so that the rotor has good mechanical strength.

[0047] Each set of magnet receiving slots also includes a second magnet receiving slot 7, which is located between the first magnet receiving slot 8 and the outer diameter edge of the lamination body 9. The first magnet receiving slot 8 and the second magnet receiving slot 7 are arranged sequentially along the radial direction of the lamination body 9. Along the circumferential direction of the lamination body 9, in two adjacent sets of magnet receiving slots, the corresponding first magnet receiving slot 8 is symmetrically arranged, and the corresponding second magnet receiving slot 7 is symmetrically arranged. Both the first magnet receiving slot 8 and the second magnet receiving slot 7 are inclined along the circumferential direction of the lamination body 9. That is, in some feasible embodiments, preferably, in the area where each set of magnet receiving slots is located, in two adjacent sets of magnet receiving slots, the corresponding two first magnet receiving slots 8 are arranged in a V-shape, and the corresponding two second magnet receiving slots 7 are arranged in a V-shape.

[0048] Within the area where each magnet receiving slot is located, along the circumferential direction of the lamination body 9, weight reduction holes are provided on both sides of the area. The weight reduction holes are formed by a recess from one side of the area to the other side. The weight reduction holes are located near the inner diameter edge of the lamination body 9. The weight reduction holes can be located on the same circumference as the magnet receiving slot, or they can be located between the circumference of the magnet receiving slot and the inner diameter edge of the lamination body 9. The location of the weight reduction holes can be selected and set according to actual needs.

[0049] An electric motor rotor includes multiple motor rotor laminations as described above, the multiple motor rotor laminations being coaxially arranged and corresponding one-to-one.

[0050] The structure of the motor rotor lamination is described below with reference to a specific embodiment.

[0051] A motor rotor lamination includes a lamination body 9 and eight magnet receiving slots disposed on the lamination body 9. The lamination body 9 has an annular structure with an inner diameter edge and an outer diameter edge. Along the circumferential direction of the lamination body 9, the eight magnet receiving slots are arranged in a ring array, and the area where each magnet receiving slot is located corresponds to a magnetic pole.

[0052] In the region where each magnet receiving slot group is located, each magnet receiving slot group includes a set of first magnet receiving slots 8 and a set of second magnet receiving slots 7 arranged sequentially along the inner diameter to the outer diameter of the lamination body 9. In the set of first magnet receiving slots 8, there are two first magnet receiving slots 8, which are located on the same circumference and are symmetrically arranged in a V-shape. In the set of second magnet receiving slots 7, there are two second magnet receiving slots 7, which are located on the same circumference and are symmetrically arranged in a V-shape. The included angle between the two first magnet receiving slots 8 is smaller than the included angle between the two second magnet receiving slots 7. The axis of symmetry of the set of first magnet receiving slots 8 and the axis of symmetry of the set of second magnet receiving slots 7 are the same, which can both be the D-axis.

[0053] An auxiliary hole 3 is provided between the second magnet receiving groove 7 and the outer diameter edge of the punch body 9. The auxiliary hole 3 is square in shape. Each second magnet receiving groove 7 corresponds to one auxiliary hole 3. That is, there are two auxiliary holes 3. The two auxiliary holes 3 are located between the two second magnet receiving grooves 7, and the two auxiliary holes 3 are symmetrically arranged about the axis of symmetry of the two second magnet receiving grooves 7.

[0054] A first type of auxiliary groove 1 and a second type of auxiliary groove 2 are provided on the outer diameter edge of the lamination body 9. There are two of each type of auxiliary groove 1 and the second type of auxiliary groove 2. Each second type of auxiliary groove 2 corresponds to a second magnet receiving groove 7. The second type of auxiliary groove 2 is located in the radial direction of the second magnet receiving groove 7, that is, along the circumferential direction of the lamination body 9. The two second type of auxiliary groove 2 are located between the two second magnet receiving grooves 7, and the two second type of auxiliary groove 2 are symmetrically arranged about the axis of symmetry of the two second magnet receiving grooves 7.

[0055] The first type of auxiliary groove 1 is located on the side of the first magnet receiving groove 8 away from the second magnet receiving groove 7 (along the circumferential direction of the lamination body 9), and the first type of auxiliary groove 1 intersects with the peripheral edge of the area. A first type of auxiliary groove 1 is provided at the intersection of the areas where two adjacent magnet receiving groove groups are located. The two first type of auxiliary grooves 1 are symmetrically arranged about the intersection line of the areas where the two adjacent magnet receiving groove groups are located. The intersection of the two first type of auxiliary grooves 1 is at the maximum depth of the two first type of auxiliary grooves 1.

[0056] At one end of the first magnet receiving groove 8 near the inner diameter edge of the lamination body 9, along the circumferential direction of the lamination body 9, a second magnetic isolation groove 5 is provided on one side of the first magnet receiving groove 8. The second magnetic isolation groove 5 corresponds to the corner of the magnet located in the first magnet receiving groove 8, and the two symmetrically arranged first magnet receiving grooves 8 are provided on their adjacent sides, that is, the two second magnetic isolation grooves 5 are arranged opposite each other.

[0057] A first magnetic isolation groove 6 is provided at one end of the first magnet receiving groove 8 near the inner diameter edge of the lamination body 9. The first magnetic isolation grooves 6 of the two first magnet receiving grooves 8 are also arranged opposite each other, and the straight parts of the two first magnetic isolation grooves 6 are close to each other.

[0058] Weight reduction holes are provided on two oppositely arranged sides of the lamination body 9 along the circumferential direction of this region.

[0059] Due to the adoption of the above technical solution, within the area where a set of magnet receiving slots of the motor rotor lamination is located, a first type of auxiliary slot and a second type of auxiliary slot are provided on the outer diameter edge. The first type of auxiliary slot is used to optimize the high-speed main order electromagnetic force, and the second type of auxiliary slot is used to optimize the torque pulsation electromagnetic force in the constant torque region. An auxiliary hole is provided between the outer diameter edge and the magnet receiving slot group. The auxiliary hole is used to optimize the specific order electromagnetic force in the low-speed region. Furthermore, within the area where the set of magnet receiving slots is located, along the circumferential direction of the lamination body, the first type of auxiliary slot, the second type of auxiliary slot, and the auxiliary hole are arranged sequentially. The second type of auxiliary slot is located between the first type of auxiliary slots, and the auxiliary hole is located between the second type of auxiliary slots. The first type of auxiliary slot is located outside the magnet receiving slot group, and the second type of auxiliary slot and the auxiliary hole are located within the magnet receiving slot group. The inner side of the first magnet receiving slot is equipped with a magnetic bridge between the end of the first magnet receiving slot near the outer diameter edge of the lamination body and the outer diameter edge to isolate the magnets and optimize the electromagnetic force, thus ensuring the mechanical strength of the lamination. A second magnetic isolation slot is provided on the side wall of the first magnet receiving slot, which corresponds to the corner of the magnet to isolate the magnets and prevent the corner of the magnets from demagnetizing. The first magnetic isolation slot is provided at the end of the first magnet receiving slot near the inner diameter edge of the lamination body to isolate the magnets and ensure the mechanical strength of the lamination. This prevents the lamination from deforming during high-speed rotation of the rotor, reduces the electromagnetic force and torque pulsation of the rotor, thereby reducing the noise and vibration during motor operation, improving the NVH performance of the motor, and effectively reducing the 24th and 48th order radial forces, thus improving the NVH problem of the motor.

[0060] The embodiments of this utility model have been described in detail above, but the content described is only a preferred embodiment of this utility model and should not be considered as limiting the scope of implementation of this utility model. All equivalent changes and improvements made in accordance with the claims of this utility model should still fall within the patent coverage of this utility model.

Claims

1. A motor rotor lamination, comprising a lamination body and a plurality of magnet receiving slots disposed on the lamination body, wherein the plurality of magnet receiving slots are arranged sequentially along the circumferential direction of the lamination body, characterized in that: In the area where each of the magnet receiving slots is located, at least one set of adjustment structures is provided. Multiple sets of adjustment structures are arranged sequentially along the circumferential direction of the lamination body. The adjustment structure includes at least one first type of auxiliary slot and at least one second type of auxiliary slot. Both the first type of auxiliary slot and the second type of auxiliary slot are located at the outer diameter edge of the lamination body.

2. The motor rotor lamination according to claim 1, characterized in that: The adjustment structure also includes at least one auxiliary hole, which is located between the magnet receiving groove and the outer diameter edge of the lamination body.

3. The motor rotor lamination according to claim 2, characterized in that: In each set of adjustment structures, the first type of auxiliary groove, the second type of auxiliary groove, and the auxiliary hole are arranged sequentially along the circumferential direction of the lamination body.

4. The motor rotor lamination according to claim 3, characterized in that: The first type of auxiliary groove, the second type of auxiliary groove, and the auxiliary hole in the two adjacent sets of adjustment structures are all symmetrically arranged.

5. The motor rotor lamination according to any one of claims 1-4, characterized in that: The two adjacent auxiliary slots of the first type are both located in the middle of the two adjacent magnetic poles.

6. The motor rotor lamination according to claim 5, characterized in that: Along the circumferential direction of the lamination body, the depth of the first type of auxiliary groove along the radial direction of the lamination body gradually increases or gradually decreases. The two first type of auxiliary grooves at the intersection of the regions where two adjacent magnet receiving groove groups are located are symmetrically arranged, and the depth of the intersection of the two first type of auxiliary grooves is the maximum depth.

7. The motor rotor lamination according to claim 5, characterized in that: Each of the magnet receiving slot groups includes at least one set of symmetrically arranged magnet receiving slots. Each set of symmetrically arranged magnet receiving slots is provided with a plurality of second-type auxiliary slots, and the plurality of second-type auxiliary slots are symmetrically arranged with respect to the axis of symmetry of the set of magnet receiving slots.

8. The motor rotor lamination according to claim 7, characterized in that: Along the circumferential direction of the lamination body, the radial depth of the second type of auxiliary groove along the lamination body first increases and then decreases, and the two sides of the maximum depth of the second type of auxiliary groove are asymmetrically arranged.

9. The motor rotor lamination according to claim 7, characterized in that: Each set of symmetrically arranged magnet receiving slots includes a first magnet receiving slot. Along the radial direction of the lamination body, the first magnet receiving slot has a first magnetic isolation groove at one end near the inner diameter edge of the lamination body.

10. The motor rotor lamination according to claim 9, characterized in that: Along the circumferential direction of the lamination body, a second magnetic isolation groove is provided on one side of the first magnet receiving groove, and the second magnetic isolation groove corresponds to the corner of the magnet located in the first magnet receiving groove.

11. The motor rotor lamination according to claim 9 or 10, characterized in that: A magnetic bridge is provided between the end of the first magnet receiving groove near the outer diameter of the lamination body and the edge of the outer diameter of the lamination body.

12. The motor rotor lamination according to claim 1, characterized in that: Each of the magnet receiving slot groups includes multiple sets of magnet receiving slots arranged along the radial direction of the lamination body. Each set of magnet receiving slots is arranged in a V-shape or a U-shape symmetrical arrangement. Alternatively, in two adjacent sets of magnet receiving slots, one set of magnet receiving slots is arranged in a V-shape symmetrical arrangement and the other set of magnet receiving slots is arranged in a U-shape symmetrical arrangement.

13. A motor rotor, characterized in that: It includes a plurality of motor rotor laminations as described in any one of claims 1-12, wherein the plurality of motor rotor laminations are coaxially arranged.

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