Motor rotor punching sheet and motor rotor

Abstract

The invention 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 invention 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] The invention belongs to the technical field of motors, and in particular relates to a motor rotor punching sheet and a motor rotor. Background Art

[0002] Permanent magnet motors are increasingly being used in new energy vehicles. During high-speed rotation of the motor rotor, due to the effects of various factors such as electromagnetic force, vibration and noise are easily generated, which in turn affects the NVH performance of the entire motor system and the driving experience of the entire vehicle. The design of traditional motor rotor punchings often focuses on the optimization of electromagnetic performance, while the consideration of NVH performance is relatively insufficient, resulting in large noise and vibration problems during the operation of the motor. At present, motors with conventional rotor structures have been found to have high-speed 48-order and low-speed 24-order noise problems in actual bench NVH tests, which affect the driving experience of the entire vehicle, so the rotor punchings need to be optimized. Summary of the invention

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

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a motor rotor punching sheet, including a punching sheet body and a plurality of magnetic steel accommodating slot groups arranged on the punching sheet body, the plurality of magnetic steel accommodating slot groups are arranged in sequence along the circumferential direction of the punching sheet body, and in the area where each magnetic steel accommodating slot group is located, at least one group of adjustment structures is provided, and the plurality of groups of adjustment structures are arranged in sequence along the circumferential direction of the punching sheet body, and the adjustment structures include at least one first-type auxiliary slot and at least one second-type auxiliary slot, and the first-type auxiliary slot and the second-type auxiliary slot are both arranged at the outer diameter edge of the punching sheet body.

[0005] Furthermore, the adjustment structure also includes at least one auxiliary hole, which is arranged between the magnetic steel accommodating groove group and the outer diameter edge of the punching sheet body.

[0006] Furthermore, in each set of adjustment structures, the first type of auxiliary grooves, the second type of auxiliary grooves and the auxiliary holes are arranged in sequence along the circumferential direction of the punch body.

[0007] Furthermore, the first type of auxiliary grooves, the second type of auxiliary grooves and the auxiliary holes in two adjacent groups of adjustment structures are symmetrically arranged.

[0008] Furthermore, two adjacent first-type auxiliary grooves are both arranged at the middle position between two adjacent magnetic poles.

[0009] Furthermore, along the circumferential direction of the punch body, the depth of the first type of auxiliary groove along the radial direction of the punch body gradually increases or decreases, and the two first type of auxiliary grooves at the intersection of the areas where two adjacent magnetic steel accommodating 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 magnetic steel accommodating groove group includes at least one group of symmetrically arranged magnetic steel accommodating grooves, and a plurality of second-type auxiliary grooves are arranged between each group of symmetrically arranged magnetic steel accommodating grooves, and the plurality of second-type auxiliary grooves are symmetrically arranged relative to the symmetry axis of the group of magnetic steel accommodating grooves.

[0011] Furthermore, along the circumferential direction of the punch body, the radial depth of the second type of auxiliary grooves along the punch body first increases and then decreases, and the two sides of the maximum depth of the second type of auxiliary grooves are asymmetrically arranged.

[0012] Furthermore, each group of symmetrically arranged magnetic steel accommodating grooves includes a first magnetic steel accommodating groove, and along the radial direction of the punch body, a first magnetic isolation groove is provided at one end of the first magnetic steel accommodating groove close to the inner diameter edge of the punch body.

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

[0014] Furthermore, a magnetic bridge is provided between an end of the first magnetic steel accommodating groove close to the outer diameter of the punch body and an outer diameter edge of the punch body.

[0015] Furthermore, each magnetic steel accommodating groove group includes multiple groups of magnetic steel accommodating grooves arranged along the radial direction of the punching sheet body, and each group of magnetic steel accommodating grooves is symmetrically arranged in a V shape or symmetrically arranged in a U shape, or, among two adjacent groups of magnetic steel accommodating grooves, one group of magnetic steel accommodating grooves is symmetrically arranged in a V shape, and the other group of magnetic steel accommodating grooves is symmetrically arranged in a U shape.

[0016] A motor rotor comprises a plurality of motor rotor punching sheets as described above, wherein the plurality of motor rotor punching sheets are coaxially arranged.

[0017] Due to the adoption of the above technical solution, in the area where a group of magnetic steel accommodating slot groups of the motor rotor punching sheet are located, first-type auxiliary slots and second-type auxiliary slots are arranged on the outer diameter edge, the first-type auxiliary slots are used to optimize the high-speed main-order electromagnetic force, the second-type auxiliary slots are used to optimize the torque pulsator electromagnetic force in the constant torque area, and auxiliary holes are arranged between the outer diameter edge and the magnetic steel accommodating slot group, the auxiliary holes are used to optimize the specific-order electromagnetic force in the low-speed area, and in the area where the group of magnetic steel accommodating slot groups are located, along the circumferential direction of the punching sheet body, the first-type auxiliary slots, the second-type auxiliary slots and the auxiliary holes are arranged in sequence, the second-type auxiliary slots are located between the first-type auxiliary slots, the auxiliary holes are located between the second-type auxiliary slots, the first-type auxiliary slots are located on the outside of the magnetic steel accommodating slot group, and the second-type auxiliary slots and the auxiliary holes are located on the outside of the magnetic steel accommodating slot group. On the inner side; a magnetic bridge is arranged between one end of the outer diameter edge of the first magnetic steel accommodating groove of the magnetic steel accommodating groove group close to the outer diameter edge of the punching sheet body and the outer diameter edge to isolate the magnet and optimize the electromagnetic force to ensure the mechanical strength of the punching sheet; a second magnetic isolation groove is arranged on the side wall of the first magnetic steel accommodating groove, and the second magnetic isolation groove corresponds to the corner of the magnetic steel to isolate the magnet and prevent the corner of the magnetic steel from demagnetizing. A first magnetic isolation groove is arranged at one end of the inner diameter edge of the first magnetic steel accommodating groove close to the inner diameter edge of the punching sheet body to isolate the magnet and ensure the mechanical strength of the punching sheet, avoid deformation of the punching sheet during high-speed rotation of the rotor, reduce the electromagnetic force and torque pulsation of the rotor, and thus reduce the noise and vibration during the operation of the motor, improve the NVH performance of the motor, and can effectively reduce the 24th and 48th order radial forces, so that the NVH problem of the motor is improved. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0019] Figure 2 It is a schematic structural diagram of a rotor punching sheet according to an embodiment of the present invention.

[0020] In the figure:

[0021] 1. First type auxiliary groove 2. Second type auxiliary groove 3. Auxiliary hole

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

[0023] 7. Second magnetic steel receiving slot 8. First magnetic steel receiving slot 9. Punching sheet body DETAILED DESCRIPTION

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

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

[0026] A motor rotor punching sheet, such as Figure 1 and 2 As shown, it includes a sheet body 9 and a plurality of magnetic steel accommodating slot groups arranged on the sheet body 9, wherein the plurality of magnetic steel accommodating slot groups are sequentially arranged along the circumferential direction of the sheet body 9, each magnetic steel accommodating slot group occupies a certain area, and the plurality of magnetic steel accommodating slot groups are arranged at equal intervals along the circumferential direction of the sheet body 9, so that the sheet structure is symmetrical and stable, which is convenient for the assembly of the rotor and also ensures that the performance of the rotor composed of a plurality of rotor sheets meets the design requirements; the number of magnetic steel accommodating slot groups is selected according to actual needs, and no specific requirements are made here; the sheet body 9 is an annular structure, having an outer diameter edge and an inner diameter edge;

[0027] Each magnetic steel accommodating slot group is arranged along the radial direction of a punch body 9, and occupies a certain area in the radial direction. In the area where each magnetic steel accommodating slot group is located, at least one group of adjustment structures is provided. The setting of the adjustment structure is used to adjust and optimize the electromagnetic force and torque pulsation of the rotor, thereby optimizing the NVH of the motor. Multiple groups of adjustment structures are arranged in sequence along the circumferential direction of the punch body 9. Along the radial direction of the punch body 9, multiple groups of adjustment structures are arranged in the sub-area from the magnetic steel accommodating slot group to the outer diameter edge of the punch body 9. Each adjustment structure is located at the outer diameter edge of the punch body 9, and the outer diameter edge of the punch body 9 is structurally improved and optimized, thereby optimizing the electromagnetic force and torque pulsation of the rotor;

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

[0029] In a further optimization scheme, each adjustment structure can also be located between the magnetic steel accommodating slot group and the outer diameter edge of the punch body 9, and the structure between the magnetic steel accommodating slot group and the outer diameter edge of the punch body 9 is improved and optimized to further optimize the electromagnetic force and torque pulsation of the rotor. In the case of this structure, the adjustment structure also includes at least one auxiliary hole 3, which is provided between the magnetic steel accommodating slot group and the outer diameter edge of the punch body 9. The number of the auxiliary holes 3 is selected according to actual needs, and no specific requirements are made here.

[0030] In each group of adjustment structures, along the circumferential direction of the punch body 9, the first type of auxiliary grooves 1, the second type of auxiliary grooves 2 and the auxiliary holes 3 are arranged in sequence, that is, along the circumferential direction of the punch body 9, at least one first type of auxiliary groove 1 and at least one second type of auxiliary groove 2 are arranged in sequence on the outer diameter edge of the punch body 9, and there is a certain distance between the multiple first type of auxiliary grooves 1 and the multiple second type of auxiliary grooves 2, and the distance is selected and set according to actual design requirements. The multiple auxiliary holes 3 are arranged on the side of the second type of auxiliary grooves 2 away from the first type of auxiliary grooves 1, and there is a certain distance between the multiple auxiliary holes 3 and the multiple second type of auxiliary grooves 2, and the distance is selected and set according to actual design requirements.

[0031] The setting directions of the first type of auxiliary grooves 1, the second type of auxiliary grooves 2 and the auxiliary holes 3 in two adjacent groups of adjustment structures are opposite. Along the radial direction of the punch body 9, the first type of auxiliary grooves 1, the second type of auxiliary grooves 2 and the auxiliary holes 3 in the two groups of adjustment structures are symmetrically arranged. In one group of adjustment structures, along the first circumferential direction of the punch body 9 (such as clockwise direction), the first type of auxiliary grooves 1, the second type of auxiliary grooves 2 and the auxiliary holes 3 are arranged in sequence. In another group of adjustment structures, along the second circumferential direction of the punch body 9 (such as counterclockwise direction), the first type of auxiliary grooves 1, the second type of auxiliary grooves 2 and the auxiliary holes 3 are arranged in sequence. That is, the corresponding first type of auxiliary grooves 1 in the two groups of adjustment structures are symmetrically arranged, the corresponding second type of auxiliary grooves 2 are symmetrically arranged, and the corresponding auxiliary holes 3 are symmetrically arranged.

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

[0033] In some feasible embodiments, preferably, two adjacent first-type auxiliary slots 1 are arranged at the middle position of two adjacent magnetic poles, the area where each magnetic steel accommodating 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, and two adjacent first-type auxiliary slots 1 are located at the middle position of the two magnetic poles, that is, two adjacent first-type auxiliary slots 1 are located on the Q-axis, that is, one side edge of the area where each magnetic steel accommodating slot group is located and one side edge of the area where another magnetic steel accommodating slot group close to the area where this magnetic steel accommodating slot group is located are both provided with a first-type accommodating slot 1, so that two adjacent first-type accommodating slots 1 are located at the middle position of the area where the two magnetic steel accommodating slot groups are located.

[0034] The first type of auxiliary slot 1 is set as the Q-axis auxiliary slot of the rotor, which is used to optimize the high-speed main order electromagnetic force, thereby optimizing the NVH of the motor. The first type of auxiliary slot 1 is a slot structure formed by the outer diameter edge of the punch body 9 being recessed in the inner diameter direction. Along the circumferential direction of the punch body 9, the depth of the first type of auxiliary slot 1 along the radial direction of the punch body 9 gradually increases or decreases. The two first type of auxiliary slots 1 at the intersection of the area where the two adjacent magnetic steel accommodating slot groups are located are symmetrically arranged, and the depth of the intersection of the two first type of auxiliary slots 1 is the maximum depth, that is, the two first type of auxiliary slots 1 located in the middle of the two magnetic poles are arranged to intersect, and the intersection position is the position where the depth of the two first type of auxiliary slots 1 along the radial direction of the punch body 9 is the largest. Therefore, the auxiliary groove structure composed of the two intersecting and symmetrically arranged first type of auxiliary slots 1 is a symmetrical structure, which is symmetrically arranged along the Q axis, and the intersection is the place with the maximum depth. The depth of the auxiliary groove structure along the circumferential direction of the punch body 9 and along the radial direction of the punch body 9 first increases and then decreases.

[0035] In the area where each magnetic steel accommodating slot group is located, each of the magnetic steel accommodating slot groups includes at least one group of symmetrically arranged magnetic steel accommodating slots, and a plurality of second-type auxiliary slots 2 are arranged between each group of symmetrically arranged magnetic steel accommodating slots, and the plurality of second-type auxiliary slots 2 are symmetrically arranged relative to the symmetry axis of the group of magnetic steel accommodating slots. Specifically, each magnetic steel accommodating slot group includes a plurality of magnetic steel accommodating slots for accommodating magnetic steels, and the plurality of magnetic steel accommodating slots are arranged in a plurality of groups, and the plurality of groups of magnetic steel accommodating slots are arranged in sequence along the circumferential direction of the punching sheet body 9, and along the circumferential direction of the punching sheet body 9, two adjacent groups of magnetic steel accommodating slots are symmetrically arranged to form a plurality of groups of symmetrically arranged accommodating slots, and the number of magnetic steel accommodating slots in each group of magnetic steel accommodating slots is at least one, and the plurality of magnetic steel accommodating slots in each group are arranged in sequence along the radial direction of the punching sheet body 9. Along the circumferential direction of the punch body 9, a plurality of second-type auxiliary grooves 2 are arranged at the outer diameter edge of the punch body 9 corresponding to each group of symmetrically arranged magnetic steel receiving grooves, and the plurality of second-type auxiliary grooves 2 are symmetrically arranged, and the symmetry axes of the plurality of second-type auxiliary grooves 2 coincide with the symmetry axes of the group of symmetrically arranged magnetic steel receiving grooves.

[0036] The second type of auxiliary groove 2 is set as the Q-axis auxiliary groove of the rotor, which is used to optimize the torque pulsation and electromagnetic force in the constant torque area, so as to optimize the NVH of the motor. The second type of auxiliary groove 2 is a groove structure formed by the outer diameter edge of the punch body 9 being recessed in the inner diameter direction. Along the circumferential direction of the punch body 9, the depth of the second type of auxiliary groove 2 along the radial direction of the punch body 9 first increases and then decreases, that is, the depth of the middle part of the second type of auxiliary groove 2 is the largest, and the depth of the two sides is the smallest, and the two sides of the maximum depth of the second type of auxiliary groove 2 are asymmetrically arranged, and the lengths of the two sides of the maximum depth of the second type of auxiliary groove 2 along the circumferential direction of the punch body 9 are different, or the shapes of the walls of the grooves along the circumferential direction of the punch body 9 on both sides of the maximum depth of the second type of auxiliary groove 2 are different, such as one straight line and the other arc, that is, the depth variation rules of the grooves on both sides of the maximum depth of the second type of auxiliary groove 2 are different.

[0037] A plurality of auxiliary holes 3 are provided between each group of symmetrically arranged magnetic steel accommodating grooves, and the plurality of auxiliary holes 3 are symmetrically arranged relative to the symmetry axis of the group of magnetic steel accommodating grooves, and the distance between the plurality of auxiliary holes 3 and the symmetry axis is smaller than the distance between the plurality of second-type auxiliary grooves 2 and the symmetry axis, that is, the auxiliary holes 3 are located between the second-type auxiliary grooves 2.

[0038] Structurally, along the radial direction of the punch body 9, each group of magnetic steel accommodating grooves corresponds to at least one group of adjustment structures, that is, in the radial region where each group of magnetic steel accommodating grooves is located, at least one group of adjustment structures is provided, and the outer diameter edge in the radial region where each group of magnetic steel accommodating grooves is located and the portion between the magnetic steel accommodating grooves close to the outer diameter edge and the outer diameter edge are structurally optimized and improved, so as to adjust and optimize the electromagnetic force and torque pulsation of the rotor.

[0039] In some feasible embodiments, preferably, each group of magnetic steel accommodating grooves corresponds to a group of adjustment structures, and a group of adjustment structures is provided in the radial region where each group of magnetic steel accommodating grooves is located, and the group of adjustment structures includes a first-type auxiliary groove 1, a second-type auxiliary groove 2 and an auxiliary hole 3. When the first-type auxiliary groove 1, the second-type auxiliary groove 2 and the auxiliary hole 3 in the group of adjustment structures are provided, along the circumferential direction of the punch body 9, the first-type auxiliary groove 1 and the second-type auxiliary groove 2 are provided on both sides of each group of magnetic steel accommodating grooves, that is, the first-type auxiliary groove 1 and the second-type auxiliary groove 2 are provided on the left and right sides of the group of magnetic steel accommodating grooves (in the circumferential direction of the punch body 9), respectively, the auxiliary hole 3 is located on one side of the group of magnetic steel accommodating grooves, and the auxiliary hole 3 is also located on the side of the second-type auxiliary groove 2 away from the group of magnetic steel accommodating grooves.

[0040] The length and depth dimensions of the first type of auxiliary groove 1 and the length and depth dimensions 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 is set as the Q-axis auxiliary hole 3 of the rotor, which is used to optimize the electromagnetic force of a specific order in the low-speed zone, thereby optimizing the NVH of the motor. The auxiliary hole 3 is a through-hole structure that penetrates the punch body 9. The shape of the auxiliary hole 3 can be circular, square, polygonal, or other shapes, which can be selected according to actual needs, and no specific requirements are made here. The size of the auxiliary hole 3 is selected and set according to actual needs, and no specific requirements are made here.

[0042] Each magnetic steel accommodating groove group includes multiple groups of magnetic steel accommodating grooves arranged along the radial direction of the punch body 9. The number of magnetic steel accommodating grooves in each group is multiple, and the multiple magnetic steel accommodating grooves are arranged along the circumferential direction of the punch body 9, and the multiple magnetic steel accommodating grooves are symmetrically arranged. Each group of magnetic steel accommodating grooves is V-shaped symmetrically arranged or U-shaped symmetrically arranged, or, in two adjacent groups of magnetic steel accommodating grooves, one group of magnetic steel accommodating grooves is V-shaped symmetrically arranged, and the other group of magnetic steel accommodating grooves is U-shaped symmetrically arranged. The setting method of the magnetic steel accommodating grooves in each group and the setting method of the magnetic steel accommodating grooves in two adjacent groups arranged along the radial direction of the punch body 9 are selected according to actual needs, and no specific requirements are made here.

[0043] A further optimized solution is that each group of magnetic steel accommodating grooves includes a first magnetic steel accommodating groove 8. Along the radial direction of the punching sheet body 9, an end of the first magnetic steel accommodating groove 8 close to the inner diameter edge of the punching sheet body 9 is provided with a first magnetic isolation groove 6. The first magnetic isolation groove 6 is connected to the first magnetic steel accommodating groove 8. The setting of the first magnetic isolation groove 6 is used for magnetic isolation and at the same time ensures the mechanical strength of the punching sheet, so that the mechanical strength of the rotor is good.

[0044] The first magnetic isolation groove 6 passes through the punch body 9, and its shape can be circular, elliptical, square, or other shapes, which can be selected according to actual needs. In some feasible embodiments, the first magnetic isolation groove 6 includes a straight portion and a curved portion connected to each other, the other end of the straight portion is connected to the side wall of the first magnetic steel accommodating groove 8, and the other end of the curved portion is connected to the other side wall of the first magnetic steel accommodating groove 8, forming an irregularly shaped first magnetic isolation groove 6 structure, and the curved portion is preferably a superior arc structure.

[0045] Further optimization scheme, along the circumferential direction of the punch body 9, a second magnetic isolation groove 5 is provided on one side of the first magnetic steel accommodating groove 8, the second magnetic isolation groove 5 corresponds to the corner of the magnetic steel located in the first magnetic steel accommodating groove 8, the second magnetic isolation groove 5 is formed by the side wall depression of the first magnetic steel accommodating groove 8, the second magnetic isolation groove 5 is provided for magnetic isolation, and prevents the corner of the magnetic steel from demagnetization. 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 portion of the first magnetic isolation groove 6.

[0046] A further optimization scheme is that a magnetic bridge 4 is provided between one end of the first magnetic steel accommodating groove 8 close to the outer diameter of the punching sheet body 9 and the outer diameter edge of the punching sheet body 9. The magnetic bridge 4 is provided to isolate the magnetism, optimize the electromagnetic force and ensure the mechanical strength of the punching sheet at the same time, so that the mechanical strength of the rotor is good.

[0047] Each group of magnetic steel accommodating grooves also includes a second magnetic steel accommodating groove 7, which is located between the first magnetic steel accommodating groove 8 and the outer diameter edge of the punch body 9, and the first magnetic steel accommodating groove 8 and the second magnetic steel accommodating groove 7 are sequentially arranged along the radial direction of the punch body 9. Along the circumferential direction of the punch body 9, in two adjacent groups of magnetic steel accommodating grooves, the corresponding first magnetic steel accommodating grooves 8 are symmetrically arranged, and the corresponding second magnetic steel accommodating grooves 7 are symmetrically arranged, and the first magnetic steel accommodating grooves 8 and the second magnetic steel accommodating grooves 7 are both inclinedly arranged along the circumferential direction of the punch body 9. That is, in some feasible embodiments, preferably, in the area where each magnetic steel accommodating groove group is located, in two adjacent groups of magnetic steel accommodating grooves, the corresponding two first magnetic steel accommodating grooves 8 are arranged in a V shape, and the corresponding two second magnetic steel accommodating grooves 7 are arranged in a V shape.

[0048] In the area where each magnetic steel accommodating slot group is located, weight-reducing holes are arranged on both sides of the area along the circumferential direction of the punching sheet body 9. The weight-reducing holes are formed by a side of the area being recessed toward the other side. The weight-reducing holes are located at the inner diameter edge of the area close to the punching sheet body 9. The weight-reducing holes can be located on the same circumference as the magnetic steel accommodating slot group, or the weight-reducing holes can be located between the circumference where the magnetic steel accommodating slot group is located and the inner diameter edge of the punching sheet body 9. The position of the weight-reducing holes is selected and set according to actual needs.

[0049] A motor rotor comprises a plurality of motor rotor punchings as described above, wherein the plurality of motor rotor punchings are coaxially arranged and correspond to each other one by one.

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

[0051] A motor rotor punching sheet, comprising a punching sheet body 9 and 8 magnetic steel receiving slot groups arranged on the punching sheet body 9, wherein the punching sheet body 9 is an annular structure, having an inner diameter edge and an outer diameter edge, and along the circumferential direction of the punching sheet body 9, the 8 magnetic steel receiving slot groups are arranged in an annular array, and the area where each magnetic steel receiving slot group is located corresponds to a magnetic pole;

[0052] In the area where each magnetic steel accommodating groove group is located, each magnetic steel accommodating groove group includes a group of first magnetic steel accommodating grooves 8 and a group of second magnetic steel accommodating grooves 7 arranged in sequence along the inner diameter to the outer diameter direction of the punch body 9. In a group of first magnetic steel accommodating grooves 8, the number of first magnetic steel accommodating grooves 8 is two, the two first magnetic steel accommodating grooves 8 are located on the same circumference, and the two first magnetic steel accommodating grooves 8 are symmetrically arranged in a V shape. In a group of second magnetic steel accommodating grooves 7, the number of second magnetic steel accommodating grooves 7 is two, the two second magnetic steel accommodating grooves 7 are located on the same circumference, and the two second magnetic steel accommodating grooves 7 are symmetrically arranged in a V shape. The angle between the two first magnetic steel accommodating grooves 8 is smaller than the angle between the two second magnetic steel accommodating grooves 7. The symmetry axis of a group of first magnetic steel accommodating grooves 8 and the symmetry axis of a group of second magnetic steel accommodating grooves 7 are the same, and can both be the D axis.

[0053] An auxiliary hole 3 is arranged between the second magnetic steel accommodating groove 7 and the outer diameter edge of the punch body 9. The auxiliary hole 3 is square in shape. Each second magnetic steel accommodating groove 7 corresponds to an auxiliary hole 3, that is, the number of auxiliary holes 3 is two, the two auxiliary holes 3 are located between the two second magnetic steel accommodating grooves 7, and the two auxiliary holes 3 are symmetrically arranged about the symmetry axis of the two second magnetic steel accommodating grooves 7.

[0054] The first type of auxiliary grooves 1 and the second type of auxiliary grooves 2 are arranged on the outer diameter edge of the punch body 9. The number of the first type of auxiliary grooves 1 and the number of the second type of auxiliary grooves 2 are both two. Each second type of auxiliary groove 2 corresponds to a second magnetic steel accommodating groove 7. The second type of auxiliary grooves 2 are located in the radial direction of the second magnetic steel accommodating groove 7, that is, along the circumferential direction of the punch body 9, the two second type of auxiliary grooves 2 are located between the two second magnetic steel accommodating grooves 7, and the two second type of auxiliary grooves 2 are symmetrically arranged about the symmetry axis of the two second magnetic steel accommodating grooves 7.

[0055] The first type of auxiliary groove 1 is located on the side of the first magnetic steel accommodating groove 8 away from the second magnetic steel accommodating groove 7 (along the circumferential direction of the punching sheet body 9), and the first type of auxiliary groove 1 intersects with the circumferential edge of the area, and a first type of auxiliary groove 1 is arranged at the intersection of the areas where two adjacent magnetic steel accommodating 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 magnetic steel accommodating groove groups are located, and the intersection of the two first type of auxiliary grooves 1 is the maximum depth of the two first type of auxiliary grooves 1.

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

[0057] A first magnetic isolation groove 6 is arranged at one end of the first magnetic steel accommodating groove 8 close to the inner diameter edge of the punching sheet body 9, and the first magnetic isolation grooves 6 of the two first magnetic steel accommodating grooves 8 arranged opposite to each other are also arranged opposite to each other, and the straight parts of the two first magnetic isolation grooves 6 are close to each other.

[0058] Along the circumferential direction of the punch body 9, lightening holes are provided on two opposite sides of the region.

[0059] Due to the adoption of the above technical solution, in the area where a group of magnetic steel accommodating slot groups of the motor rotor punching sheet are located, first-type auxiliary slots and second-type auxiliary slots are arranged on the outer diameter edge, the first-type auxiliary slots are used to optimize the high-speed main-order electromagnetic force, the second-type auxiliary slots are used to optimize the torque pulsator electromagnetic force in the constant torque area, and auxiliary holes are arranged between the outer diameter edge and the magnetic steel accommodating slot group, the auxiliary holes are used to optimize the specific-order electromagnetic force in the low-speed area, and in the area where the group of magnetic steel accommodating slot groups are located, along the circumferential direction of the punching sheet body, the first-type auxiliary slots, the second-type auxiliary slots and the auxiliary holes are arranged in sequence, the second-type auxiliary slots are located between the first-type auxiliary slots, the auxiliary holes are located between the second-type auxiliary slots, the first-type auxiliary slots are located on the outside of the magnetic steel accommodating slot group, and the second-type auxiliary slots and the auxiliary holes are located on the outside of the magnetic steel accommodating slot group. On the inner side; a magnetic bridge is arranged between one end of the outer diameter edge of the first magnetic steel accommodating groove of the magnetic steel accommodating groove group close to the outer diameter edge of the punching sheet body and the outer diameter edge to isolate the magnet and optimize the electromagnetic force to ensure the mechanical strength of the punching sheet; a second magnetic isolation groove is arranged on the side wall of the first magnetic steel accommodating groove, and the second magnetic isolation groove corresponds to the corner of the magnetic steel to isolate the magnet and prevent the corner of the magnetic steel from demagnetizing. A first magnetic isolation groove is arranged at one end of the inner diameter edge of the first magnetic steel accommodating groove close to the inner diameter edge of the punching sheet body to isolate the magnet and ensure the mechanical strength of the punching sheet, avoid deformation of the punching sheet during high-speed rotation of the rotor, reduce the electromagnetic force and torque pulsation of the rotor, and thus reduce the noise and vibration during the operation of the motor, improve the NVH performance of the motor, and can effectively reduce the 24th and 48th order radial forces, so that the NVH problem of the motor is improved.

[0060] The embodiments of the present invention are described in detail above, but the contents described are only preferred embodiments of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A motor rotor punching sheet, comprising a punching sheet body and a plurality of magnetic steel receiving slot groups arranged on the punching sheet body, wherein the plurality of magnetic steel receiving slot groups are arranged in sequence along the circumferential direction of the punching sheet body, characterized in that: In each area where the magnetic steel accommodating groove group is located, at least one group of adjustment structures is provided, and multiple groups of adjustment structures are arranged in sequence along the circumferential direction of the punching sheet body. The adjustment structure includes at least one first-type auxiliary groove and at least one second-type auxiliary groove. The first-type auxiliary groove and the second-type auxiliary groove are both arranged at the outer diameter edge of the punching sheet body.

2. The motor rotor punching sheet according to claim 1, characterized in that: The adjustment structure further includes at least one auxiliary hole, and the auxiliary hole is arranged between the magnetic steel accommodating groove group and the outer diameter edge of the punching sheet body.

3. The motor rotor punching sheet according to claim 2, characterized in that: In each group of the adjustment structures, the first type of auxiliary grooves, the second type of auxiliary grooves and the auxiliary holes are arranged in sequence along the circumferential direction of the punch body.

4. The motor rotor punching sheet according to claim 3, characterized in that: The first-type auxiliary grooves, the second-type auxiliary grooves, and the auxiliary holes in two adjacent groups of the adjustment structures are symmetrically arranged.

5. The motor rotor punching sheet according to any one of claims 1 to 4, characterized in that: Two adjacent first-type auxiliary grooves are both arranged at the middle position between two adjacent magnetic poles.

6. The motor rotor punching sheet according to claim 5, characterized in that: Along the circumferential direction of the punch body, the depth of the first type of auxiliary groove along the radial direction of the punch body gradually increases or decreases, and the two first type of auxiliary grooves at the intersection of the areas where two adjacent magnetic steel accommodating 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 punching sheet according to claim 5, characterized in that: Each of the magnetic steel accommodating groove groups includes at least one group of symmetrically arranged magnetic steel accommodating grooves, and a plurality of the second-type auxiliary grooves are arranged between each group of symmetrically arranged magnetic steel accommodating grooves, and the plurality of the second-type auxiliary grooves are symmetrically arranged relative to the symmetry axis of the group of magnetic steel accommodating grooves.

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

9. The motor rotor punching sheet according to claim 7, characterized in that: Each group of symmetrically arranged magnetic steel accommodating grooves includes a first magnetic steel accommodating groove. Along the radial direction of the punch body, a first magnetic isolation groove is provided at one end of the first magnetic steel accommodating groove close to the inner diameter edge of the punch body.

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

11. The motor rotor punching sheet according to claim 9 or 10, characterized in that: A magnetic bridge is provided between one end of the first magnetic steel accommodating groove close to the outer diameter of the punching sheet body and the outer diameter edge of the punching sheet body.

12. The motor rotor punching sheet according to claim 1, characterized in that: Each of the magnetic steel accommodating groove groups includes multiple groups of magnetic steel accommodating grooves arranged along the radial direction of the punching sheet body, and each group of the magnetic steel accommodating grooves is symmetrically arranged in a V shape or symmetrically arranged in a U shape, or, among two adjacent groups of the magnetic steel accommodating grooves, one group of the magnetic steel accommodating grooves is symmetrically arranged in a V shape, and the other group of the magnetic steel accommodating grooves is symmetrically arranged in a U shape.

13. A motor rotor, characterized in that: It comprises a plurality of motor rotor punching sheets as described in any one of claims 1 to 12, wherein the plurality of motor rotor punching sheets are coaxially arranged.

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