Rotor core, rotor assembly, motor, driving assembly and vehicle

Abstract

The utility model discloses a rotor core, a rotor assembly, a motor, a driving assembly and a vehicle, a rotating hole and a fragile part are formed on the rotor core, in the radial direction of the rotor core, the minimum distance between the fragile part and the rotating hole is L1, the difference between the outer diameter and the inner diameter of the rotor core is L2, and L1 and L2 meet the condition that L1 / L2 is greater than or equal to 0.4 and less than or equal to 0.61. According to the rotor core provided by the utility model, the maximum stress of the weak area of the rotor core can be reduced by optimizing the position of the weak part on the rotor core, so that the probability of damage of the rotor core in the working process is reduced, the reliability of a motor in the working process is improved, and the upper limit of the running speed of the motor can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technology field especially is rotor core, rotor assembly, motor, drive assembly and vehicle. BACKGROUND

[0002] In the process of motor working, with the increase of motor rotating speed, the stress on rotor core also increases, wherein, the hole groove structure on rotor core is more, makes rotor core to have some structural weak area, for example, the magnetic steel groove and the magnetic bridge between rotor core outer periphery, the magnetic bridge and reinforcing rib between magnetic steel groove, when the stress of these structural weak area is big, rotor core can produce structural damage, thereby influence the reliability in the process of motor working, and can limit the upper limit of motor running speed. SUMMARY

[0003] The utility model discloses at least solve one of the technical problems in prior art, for this, the utility model provides a rotor core, the rotor core can reduce the probability of breakage in the process of working.

[0004] The utility model discloses still provide a rotor assembly with above-mentioned rotor core.

[0005] The utility model discloses still provide a motor with above-mentioned rotor assembly.

[0006] The utility model discloses still provide a drive assembly with above-mentioned motor.

[0007] The utility model discloses still provide a vehicle with above-mentioned motor or drive assembly.

[0008] According to the rotor core of the utility model first aspect, form the weak part and the rotation hole on the rotor core, in the radial direction of the rotor core, the minimum spacing of the weak part and the rotation hole is L1, the difference of the outer diameter and the inner diameter of the rotor core is L2, L1 and L2 satisfy: L1 / L2 is greater than or equal to 0.4 and less than or equal to 0.61.

[0009] According to the rotor core of the utility model first aspect, through optimizing the position of weak part on rotor core, can reduce the maximum stress of weak area of rotor core, thereby reduce the probability of breakage in the process of rotor core working, improve the reliability in the process of motor working, and can improve the upper limit of motor running speed.

[0010] According to some embodiments of the utility model, be equipped with multiple magnetic pole areas on the rotor core, multiple the magnetic pole areas are arranged at intervals in the circumference direction of the rotor core, and the weak part includes at least one magnetic steel groove formed in each magnetic pole area.

[0011] According to some embodiments of the utility model, the quantity of the magnetic steel groove of each said magnetic pole area is multiple, multiple said magnetic steel grooves are arranged at intervals in each said magnetic pole area, and multiple said magnetic steel grooves are arranged symmetrically along the D axis of the magnetic pole area.

[0012] According to some embodiments of the utility model, the magnetic pole area is provided with a magnetic steel groove group, the magnetic steel groove group comprises multiple said magnetic steel grooves, and the multiple said magnetic steel grooves comprise at least one circumferential groove and two radial grooves, two said radial grooves are arranged on the two sides of the D axis of the magnetic pole area respectively, the circumferential groove is arranged between the two said radial grooves, the circumferential groove extends along the circumference of the rotor core, and one end of the radial groove is opposite to the circumferential groove in the circumferential direction of the rotor core, and the other end extends towards the direction of the radial outward of the rotor core.

[0013] According to some embodiments of the utility model, in the direction of the radial outward of the rotor core, the two said radial grooves extend obliquely away from each other.

[0014] According to some embodiments of the utility model, a reinforcing rib is formed between the two said magnetic steel grooves adjacent in the magnetic steel groove group.

[0015] According to some embodiments of the utility model, the magnetic pole area is provided with multiple said magnetic steel groove groups, and the multiple said magnetic steel groove groups are arranged at intervals in the radial direction of the rotor core.

[0016] According to some embodiments of the utility model, the multiple said magnetic steel grooves in the multiple said magnetic steel groove groups are arranged symmetrically along the D axis of the magnetic pole area (11).

[0017] According to some embodiments of the utility model, in the vertical direction of the D axis of the magnetic pole area, the spacing between the two ends of the magnetic steel groove group is L3, in the radial direction of the rotor core, the spacing between the two ends of the magnetic steel groove group is L4, in the direction of the radial outward of the rotor core, L3 of each said magnetic steel groove group decreases in turn, and L4 of each said magnetic steel groove group decreases in turn.

[0018] According to some embodiments of the utility model, the multiple said magnetic steel groove groups comprise a first magnetic steel groove group and a second magnetic steel groove group, the second magnetic steel groove group is arranged on the radial outer side of the first magnetic steel groove group, the first magnetic steel groove group comprises two first circumferential grooves and two first radial grooves, and the second magnetic steel groove group comprises a second circumferential groove and two second radial grooves.

[0019] According to some embodiments of the utility model, the pole arc angle of the first magnetic steel groove group is α1, the opening angle between the two said first radial grooves is α2, and α2=k1*α1, wherein k1 satisfies: 2.1≤k1≤2.5, and the angle between the straight line segments close to each other of the two said first radial grooves forms the pole arc angle of the first magnetic steel groove group.

[0020] According to some embodiments of the present application, α1=(k3*180°) / p, wherein k3 satisfies: 0.55≤k3≤0.65, and p is the pole number of the motor.

[0021] According to some embodiments of the present application, the pole arc angle of the second magnetic steel slot group (132) is α3, the opening angle between the two second radial slots is α4, and α4=k2*α3, wherein k2 satisfies: 5.5≤k2≤5.9, and the angle between the straight line segments of the two second radial slots close to each other is formed as the pole arc angle of the second magnetic steel slot group.

[0022] According to some embodiments of the present application, α3=(k4*180°) / p, wherein k4 satisfies: 0.3≤k4≤0.35, and p is the pole number of the motor.

[0023] According to some embodiments of the present application, the magnetic steel slot comprises a containing groove and a stress buffer groove, the containing groove is used for mounting the magnetic steel, and the stress buffer groove is in communication with the containing groove.

[0024] According to some embodiments of the present application, the stress buffer groove is a plurality of, and the plurality of stress buffer grooves are arranged in the circumferential direction of the containing groove.

[0025] According to some embodiments of the present application, the rotor core is further provided with a rotor auxiliary slot on the outer peripheral wall in the radial direction, and the rotor auxiliary slot penetrates the rotor core along the axial direction of the rotor core.

[0026] According to the rotor assembly of the second aspect of the present application, the rotor core of the first aspect of the present application is provided, and the reliability in the working process of the rotor assembly can be improved.

[0027] According to the rotor assembly of the second aspect of the present application, the rotor core of the first aspect of the present application is provided, and the reliability in the working process of the rotor assembly can be improved.

[0028] According to the motor of the third aspect of the present application, the rotor assembly of the second aspect of the present application is provided, and the reliability in the working process can be improved.

[0029] According to the motor of the third aspect of the present application, the rotor assembly of the second aspect of the present application is provided, and the reliability in the working process can be improved.

[0030] According to the driving assembly of the fourth aspect of the present application, the motor of the third aspect of the present application is provided.

[0031] According to the driving assembly of the fourth aspect of the utility model, by setting the motor of the third aspect of the utility model, the reliability in the working process of the driving assembly can be improved.

[0032] According to the vehicle of the fifth aspect of the utility model, the motor of the third aspect of the utility model or the driving assembly of the fourth aspect of the utility model is set, and the reliability in the working process can be improved.

[0033] According to the vehicle of the fifth aspect of the utility model, the motor of the third aspect of the utility model or the driving assembly of the fourth aspect of the utility model is set, and the reliability in the working process can be improved.

[0034] The additional aspects and advantages of the utility model will be partly given in the following description, partly will become obvious from the following description, or be understood by the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 It is the schematic diagram of the magnetic pole area shown in the figure 1.

[0036] Figure 2 It is the schematic diagram of the magnetic pole area shown in the figure 1. Figure 1

[0037] Figure 3 It is the stress distribution diagram of the rotor assembly according to another embodiment of the utility model.

[0038] Figure 4 It is the stress distribution diagram of the rotor assembly according to another embodiment of the utility model.

[0039] Figure 5 It is the stress curve diagram of the stress maximum place with L1 / L2 variation.

[0040] Figure 6 It is the schematic diagram of another magnetic pole area shown in the figure 1. Figure 1

[0041] Reference signs:

[0042] 100, rotor assembly;

[0043] 10, rotor core;11, magnetic pole area;12, magnetic steel slot;121, circumferential slot;1211, first circumferential slot;1212, second circumferential slot;122, radial slot;1221, first radial slot;1222, second radial slot;123, accommodating slot part;124, stress buffer slot part;13, magnetic steel slot group;131, first magnetic steel slot group;132, second magnetic steel slot group;14, reinforcing rib;16, rotor auxiliary slot;17, rotating hole;

[0044] 20, magnetic steel. ​​DETAILED DESCRIPTION

[0045] Embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0046] Reference will be made to Figures 1-6 The rotor core 10 according to the first aspect of the present application is described below.

[0047] As shown in Figure 1 and Figure 2 , the rotor core 10 according to the first aspect of the present application, the rotor core 10 is formed with a rotating hole 17 and a fragile part, in the radial direction of the rotor core 10, the minimum distance between the fragile part and the rotating hole 17 is L1, the difference between the outer diameter and the inner diameter of the rotor core 10 is L2, L1 and L2 satisfy: L1 / L2 is greater than or equal to 0.4 and less than or equal to 0.61. For example, L1 / L2 can be 0.4, 0.42, 0.46, 0.5, 0.57, 0.6 or 0.61.

[0048] Among them, the fragile part includes the hole groove structure such as the magnet steel groove 12 on the rotor core 10, and the solid rotor core 10 structure between the fragile part and the rotating hole 17.

[0049] The working process of the rotor assembly 100 is simulated by simulation software, and the stress distribution on the rotor assembly 100 is obtained, as shown in Figure 3 and Figure 4 , as shown in Figure 3 is the stress distribution diagram of the rotor assembly 100 when the rotating speed is 30000 revolutions / minute and L1 / L2 is 0.46, Figure 4 is the stress distribution diagram of the rotor assembly 100 when the rotating speed is 30000 revolutions / minute and L1 / L2 is 0.4, from Figure 3 and Figure 4 It can be seen that on the rotor core 10, the stress between the fragile part between the magnet steel grooves 12 on the innermost side in the radial direction is the largest.

[0050] By changing the value of L1 / L2, the distance between the fragile part of the rotor core 10 and the rotating axis can be changed, so that the centrifugal force of the fragile part of the rotor core 10 can be changed, so that the stress distribution of the structure weak area around the magnet steel groove 12 can be changed.

[0051] In this embodiment, the position of the fragile part is optimized, the working process of the rotor assembly 100 is simulated in the simulation software, the numerical interval of L1 / L2 in this embodiment is verified, the stress at the maximum stress position of the rotor core 10 is taken as the dependent variable, the rotor assembly 100 is set to 30000 revolutions per minute, and the stress at the maximum stress position of the rotor core 10 is obtained. The stress changes with L1 / L2, as shown in FIG. 2, when L1 / L2 is in the interval of 0.4-0.61, the stress at the maximum stress position of the rotor core 10 is smaller, and the stress at the maximum stress position of the rotor core 10 is smaller than the yield limit of the material of the rotor core 10. Figure 5

[0052] According to the rotor core 10 of the first aspect of the utility model, the position of the fragile part on the rotor core 10 is optimized, the maximum stress of the fragile part of the rotor core 10 can be reduced, thereby the probability of damage of the rotor core 10 in the working process is reduced, the reliability of the motor in the working process is improved, and the upper limit of the motor operating speed can be improved.

[0053] In some embodiments of the utility model, as shown in Figure 1 and Figure 2 The rotor core 10 is provided with a plurality of magnetic pole areas 11, for example, the magnetic pole area 11 can be two, four, six or eight, the plurality of magnetic pole areas 11 are arranged at intervals in the circumferential direction of the rotor core 10, each magnetic pole area 11 is provided with at least one magnetic steel slot 12, and the fragile part comprises at least one magnetic steel slot 12 formed in each magnetic pole area 11.

[0054] That is to say, in the process of product design, the position of the magnetic steel slot 12 on the rotor core is adjusted to optimize the maximum stress of the fragile part, and it can be understood that in the process of rotating the rotor assembly 100, the magnetic steel 20 will generate a force on the inner wall of the magnetic steel slot 12, so that the stress concentration of the structure weak area around the magnetic steel slot 12 is easy to occur, and by adjusting the position of the magnetic steel slot, the stress distribution on the rotor core can be effectively optimized.

[0055] In some embodiments of the utility model, as shown in Figure 1 and Figure 2 The number of magnetic steel slots 12 of each magnetic pole area 11 is multiple, for example, the magnetic steel slot 12 can be two, three or four, the plurality of magnetic steel slots 12 are arranged at intervals in each magnetic pole area, and the plurality of magnetic steel slots 12 are arranged symmetrically along the D axis of the magnetic pole area 11.

[0056] Wherein, the D axis is the center line of the magnetic pole of the magnetic pole area 11, the magnetic steel slot 12 is provided with a magnetic steel 20, and the magnetic steel 20 in each magnetic steel slot 12 can generate a magnetic field. In the process of motor design, the number and relative position of the magnetic steel slot 12 can be adjusted to adjust the performance parameters of the motor. ​

[0057] In some embodiments of the utility model, as shown in Figure 1 And Figure 2 As shown, the magnetic pole area 11 is provided with a magnetic steel groove group 13, the magnetic steel groove group 13 includes multiple magnetic steel grooves 12, and the multiple magnetic steel grooves 12 include at least one circumferential groove 121 and two radial grooves 122, the two radial grooves 122 are respectively arranged on the two sides of the D-axis of the magnetic pole area 11, the circumferential groove 121 is arranged between the two radial grooves 122, the circumferential groove 121 extends along the circumference of the rotor core 10, and one end of the radial groove 122 is opposite the circumferential groove 121 in the circumference of the rotor core 10, and the other end extends towards the radially outward direction of the rotor core 10.

[0058] That is, the magnetic steel 20 adopts a U-shaped arrangement, and the U-shaped magnetic steel 20 arrangement can improve the reluctance torque and torque density of the motor, thereby improving the efficiency of the motor.

[0059] During product design, the number, size or relative angle of the circumferential groove 121 and the radial groove 122 can be adjusted to meet more product design needs.

[0060] In some embodiments of the utility model, as shown in Figure 1 And Figure 2 As shown, in the radially outward direction of the rotor core 10, the two radial grooves 122 extend obliquely away from each other.

[0061] In this way, the space occupied by the magnetic steel groove 12 in the radial direction of the rotor core 10 can be reduced, more magnetic steels 20 can be arranged in the radial direction of the rotor core 10, thereby further improving the reluctance torque and torque density of the motor, and reducing the difficulty of arranging the magnetic steel 20 on the motor.

[0062] In some embodiments of the utility model, as shown in Figure 1 As shown, a reinforcing rib 14 is formed between the two adjacent magnetic steel grooves 12 in the magnetic steel groove group 13.

[0063] By providing the reinforcing rib 14, the strength of the structure between the magnetic steel grooves 12 can be increased, the probability of damage of the rotor core 10 during operation is further reduced, the reliability of the motor during operation is improved, and by optimizing the position of the magnetic steel groove 12, the stress on the reinforcing rib 14 can be reduced, so that the probability of damage of the reinforcing rib 14 is low.

[0064] In some embodiments of the utility model, as shown in Figure 1 As shown, the magnetic pole area 11 is provided with multiple magnetic steel groove groups 13, for example, the magnetic steel groove group 13 can be two, three or four, and the multiple magnetic steel groove groups 13 are arranged at intervals in the radial direction of the rotor core 10.

[0065] In the process of motor design, the number and relative position of the magnetic steel slot groups 13 can be adjusted to adjust the performance parameters of the motor.

[0066] In some embodiments of the utility model, as shown in Figure 1 and Figure 2 The plurality of magnetic steel slots 12 in the plurality of magnetic steel slot groups 13 are arranged symmetrically along the D-axis of the magnetic pole area 11.

[0067] Therefore, the magnetic steel slots 12 on the rotor core 10 are distributed more regularly, which can further reduce the design difficulty of the motor, and the magnetic field distribution on the motor is more uniform, which can improve the stability of the motor during operation.

[0068] In some embodiments of the utility model, as shown in Figure 1 and Figure 2 As shown in the drawings, the distance between the two ends of the magnetic steel slot group 13 in the vertical direction of the D-axis of the magnetic pole area 11 is L3, the distance between the two ends of the magnetic steel slot group 13 in the radial direction of the rotor core 10 is L4, and in the direction outward in the radial direction of the rotor core 10, L3 of each magnetic steel slot group 13 decreases in turn, and L4 of each magnetic steel slot group 13 decreases in turn.

[0069] That is, in the direction outward in the radial direction of the rotor core 10, L3 of the outer magnetic steel slot group 13 is smaller than L3 of the inner magnetic steel slot group 13, and L4 of the outer magnetic steel slot group 13 is smaller than L4 of the inner magnetic steel slot group 13. That is, the opening size and the height size of the U-shaped distribution of the magnetic steel slot group are reduced.

[0070] Therefore, in the direction outward in the radial direction, the space occupation of the magnetic steel slot group 13 is reduced, the magnetic steel slot group 13 located on the outer side in the radial direction can occupy more space on the inner side of the U-shaped distribution of the magnetic steel slot group 13 on the inner side in the radial direction, so that the magnetic steel slot group 13 is more concentrated, and the magnetic field distribution in the magnetic pole area 11 is also more concentrated, thereby reducing the design difficulty of the motor, and further improving the efficiency of the motor.

[0071] In some embodiments of the utility model, as shown in Figure 1 and Figure 2 As shown in the drawings, the plurality of magnetic steel slot groups 13 comprise: a first magnetic steel slot group 131 and a second magnetic steel slot group 132, the second magnetic steel slot group 132 is arranged on the outer side in the radial direction of the first magnetic steel slot group 131, the first magnetic steel slot group 131 comprises two first circumferential grooves and two first radial grooves, and the second magnetic steel slot group 132 comprises one second circumferential groove and two second radial grooves.

[0072] That is, two first circumferential slots are symmetrically arranged on two sides of the D-axis of the magnetic pole area 11, two first radial slots are symmetrically arranged on two sides of the D-axis of the magnetic pole area 11 and are located on the side of the first circumferential slot away from the D-axis of the magnetic pole area 11, the second circumferential slot is symmetrically arranged along the D-axis of the magnetic pole area 11, that is, the center line of the second circumferential slot coincides with the D-axis of the magnetic pole area 11, and two second radial slots are symmetrically arranged on two sides of the D-axis of the magnetic pole area 11, and the length and width dimensions of the second radial slot are smaller than the length and width dimensions of the first radial slot.

[0073] The double-U-shaped magnetic steel 20 arrangement can reduce electromagnetic noise and harmonic distortion, improve the stability and quiet performance of the motor during operation, and the double-U-shaped magnetic steel 20 arrangement can reduce eddy current loss, thereby further improving the efficiency of the motor.

[0074] In some embodiments of the utility model, as shown in Figure 6 The polar arc angle of the first magnetic steel slot group 131 is α1, and the opening angle between the two first radial slots 1221 is α2, and α2=k1×α1, wherein k1 satisfies: 2.1≤k1≤2.5, and the angle between the straight line segments of the two first radial slots 1221 close to each other forms the polar arc angle of the first magnetic steel slot group 131.

[0075] That is, the opening angle between the two first radial slots 1221 can be within 2.1α1-2.5α1, and since the opening angle between the two first radial slots 1221 affects the harmonic content of the air gap magnetic field, limiting the opening angle between the two first radial slots 1221 can meet the requirements.

[0076] Therefore, by limiting the opening angle between the two first radial slots 1221 within the above range, the area wrapped by the two first radial slots 1221 can be increased, so that the amount of magnetic steel 20 is more, and the reluctance torque is larger, thereby the limiting speed and power density of the rotor assembly 100 can be improved, and the problem of easy generation of noise and vibration of the motor in the wrapped area of the two first radial slots 1221 can be avoided, so that the high-order harmonic content in the main magnetic field of the motor is smaller, thereby the noise and vibration of the motor can be reduced, which is beneficial to improve the noise, vibration and harshness (Noise, Vibration, Harshness, NVH) performance of the motor. For example, in some specific embodiments, k1 can be 2.1, 2.2, 2.3, 2.4, 2.5, etc.

[0077] It should be noted that the "opening angle between the two first radial slots 1221" herein can be understood as the angle between the two ends of the two first radial slots 1221 close to each other along the radial outside of the rotor core 10.

[0078] In some embodiments of the utility model, alpha1=(k3*180°) / p, wherein, k3 satisfies: 0.55<=k3<=0.65, and p is motor pole number.

[0079] Therefore, by limiting the pole arc angle alpha1 of the first magnetic steel slot group 131, the electromagnetic force of 24p can be effectively reduced, so that the NVH performance of the motor is better. For example, in some specific embodiments, k3 can be 0.55, 0.59, 0.60, 0.63, 0.65, etc.

[0080] In some embodiments of the utility model, as shown in Figure 6 The pole arc angle of the second magnetic steel slot group 132 is alpha3, the opening angle between the two second radial grooves 1222 is alpha4, alpha4=k2*alpha3, wherein k2 satisfies: 5.5<=k2<=5.9, and the angle between the straight line segments of the two second radial grooves 1222 close to each other is formed as the pole arc angle of the second magnetic steel slot group 132.

[0081] That is, the opening angle between the two second radial grooves 1222 can be within 5.5alpha3-5.9alpha3, and since the opening angle between the two second radial grooves 1222 affects the harmonic content of the air gap magnetic field, limiting the opening angle between the two second radial grooves 1222 can meet the requirements.

[0082] Therefore, by limiting the opening angle between the two second radial grooves 1222 within the above range, the area wrapped by the two second radial grooves 1222 can be increased, so that the amount of magnetic steel 20 is more, and the reluctance torque is larger, thereby the limiting speed and power density of the rotor assembly 100 can be improved, and the problem of easy generation of noise and vibration of the motor in the wrapped area of the two second radial grooves 1222 can be avoided, so that the high-order harmonic content in the main magnetic field of the motor is smaller, thereby the noise and vibration of the motor can be reduced, and the noise, vibration and harshness (Noise, Vibration, Harshness, NVH) performance of the motor can be improved. For example, in some specific embodiments, k2 can be 5.5, 5.6, 5.7, 5.8, 5.9, etc.

[0083] It should be noted that here the "opening angle between the two second radial grooves 1222" can be understood as the angle between the two ends of the two second radial grooves 1222 close to each other along the radial outside of the rotor core 10.

[0084] In some embodiments of the utility model, alpha3=(k4*180°) / p, wherein, k4 satisfies: 0.3<=k4<=0.35, and p is motor pole number.

[0085] Therefore, by limiting the pole arc angle a3 of the second magnetic steel slot group 132, the electromagnetic force of 24p can be effectively reduced, so that the NVH performance of the motor is better. For example, in some embodiments, k4 can be 0.3, 0.31, 0.32, 0.33, 0.34, 0.35, etc.

[0086] In some embodiments of the utility model, as shown in Figure 1 The magnetic steel slot 12 includes a receiving groove 123 for mounting the magnetic steel 20 and a stress buffer groove 124 in communication with the receiving groove 123.

[0087] By setting the stress buffer groove 124, the stress buffer groove 124 can disperse the force of the magnetic steel 20 on the magnetic steel slot 12 during the rotation of the rotor assembly 100, thereby reducing the stress concentration degree around the magnetic steel slot 12 and further improving the reliability during the operation of the motor.

[0088] In some embodiments of the utility model, the stress buffer groove 124 is multiple, for example, the stress buffer groove 124 can be two, three or four, and the multiple stress buffer grooves 124 are arranged in the circumferential direction of the receiving groove 123.

[0089] Therefore, the multiple stress buffer grooves 124 can buffer the stress at multiple positions in the circumferential direction of the receiving groove 123, thereby further reducing the stress concentration degree around the magnetic steel slot 12 and further improving the reliability during the operation of the motor.

[0090] In some embodiments of the utility model, as shown in Figure 1 The rotor core 10 further has a rotor auxiliary slot 16 on the outer peripheral wall in the radial direction, and the rotor auxiliary slot 16 penetrates the rotor core 10 in the axial direction of the rotor core 10. By setting the rotor auxiliary slot 16, the resistance of the rotor assembly 100 circuit, the stator winding magnetic field distribution or the slip rate and other working parameters can be adjusted during the design of the motor, thereby reducing the design difficulty of the motor and improving the performance of the motor.

[0091] According to the rotor assembly 100 of the second aspect of the utility model, the rotor core 10 and the magnetic steel 20 according to the first aspect of the utility model are set, and the magnetic steel 20 is arranged in the magnetic steel slot 12.

[0092] According to the rotor assembly 100 of the second aspect of the utility model, by setting the rotor core 10 according to the first aspect of the utility model, the reliability of the rotor assembly 100 during operation can be improved.

[0093] The motor according to the third aspect of the present application comprises the rotor assembly 100 according to the second aspect of the present application.

[0094] The motor according to the third aspect of the present application, by setting the rotor assembly 100 according to the second aspect of the present application, can improve the reliability in the working process of the motor.

[0095] The drive assembly according to the fourth aspect of the present application comprises the motor according to the third aspect of the present application.

[0096] The drive assembly according to the fourth aspect of the present application, by setting the motor according to the third aspect of the present application, can improve the reliability in the working process.

[0097] The vehicle according to the fifth aspect of the present application comprises the motor according to the third aspect of the present application or the drive assembly according to the fourth aspect of the present application.

[0098] The vehicle according to the fifth aspect of the present application, by setting the motor according to the third aspect of the present application or the drive assembly according to the fourth aspect of the present application, can improve the reliability in the working process of the vehicle.

[0099] In the description of the present application, it is 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" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0100] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0101] In the utility model, unless another definite provision and limitation, the term " install " " link " " connect " " fixed " and so on term should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electric connection, also can be communication;Can be direct connection, also can pass through intermediate medium indirectly connect, can be two element internal communication or two element's mutual action relationship. For ordinary skilled person in the art, can understand the concrete meaning of above-mentioned term in the utility model according to specific circumstances.

[0102] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0103] Although the embodiments of the present utility model have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the present utility model, and the scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A rotor core, characterized in that, The rotor core has a rotating hole and a vulnerable section formed thereon. The minimum distance between the vulnerable section and the rotating hole in the radial direction of the rotor core is L1. The difference between the outer diameter and the inner diameter of the rotor core is L2. L1 and L2 satisfy the following: L1 / L2 is greater than or equal to 0.4 and less than or equal to 0.

61.

2. The rotor core according to claim 1, characterized in that, The rotor core is provided with multiple magnetic pole regions, which are arranged at intervals in the circumferential direction of the rotor core. The vulnerable part includes at least one magnetic steel groove formed in each magnetic pole region.

3. The rotor core according to claim 2, characterized in that, The number of magnetic steel slots in each magnetic pole region is multiple. Within each magnetic pole region, the multiple magnetic steel slots are arranged at intervals and are symmetrically arranged along the D-axis of the magnetic pole region.

4. The rotor core according to claim 3, characterized in that, The magnetic pole region is provided with a magnetic steel groove assembly, which includes multiple magnetic steel grooves, each comprising: at least one circumferential groove and two radial grooves. The two radial grooves are respectively located on both sides of the D-axis of the magnetic pole region, and the circumferential groove is located between the two radial grooves. The circumferential groove extends along the circumference of the rotor core, one end of the radial groove is opposite to the circumferential groove of the rotor core, and the other end extends in the radial outward direction of the rotor core.

5. The rotor core according to claim 4, characterized in that, In the radially outward direction of the rotor core, the two radial slots extend at an angle to each other.

6. The rotor core according to claim 4, characterized in that, Reinforcing ribs are formed between two adjacent magnetic steel channels in the magnetic steel channel group.

7. The rotor core according to claim 4, characterized in that, The magnetic pole region is provided with a plurality of magnetic steel slot groups, which are arranged at intervals in the radial direction of the rotor core.

8. The rotor core according to claim 7, characterized in that, The multiple magnetic slots in the multiple magnetic slot groups are all arranged symmetrically along the D-axis of the magnetic pole region.

9. The rotor core according to claim 7, characterized in that, In the direction perpendicular to the D-axis of the magnetic pole region, the distance between the two ends of the magnetic steel slot group is L3. In the radial direction of the rotor core, the distance between the two ends of the magnetic steel slot group is L4. In the radial outward direction of the rotor core, L3 of each magnetic steel slot group decreases sequentially, and L4 of each magnetic steel slot group decreases sequentially.

10. The rotor core according to claim 5, characterized in that, The plurality of magnetic steel groove groups include: a first magnetic steel groove group and a second magnetic steel groove group, the second magnetic steel groove group being disposed radially outside the first magnetic steel groove group, the first magnetic steel groove group including two first circumferential grooves and two first radial grooves, and the second magnetic steel groove group including one second circumferential groove and two second radial grooves.

11. The rotor core according to claim 10, characterized in that, The pole arc angle of the first magnetic slot group is α1, and the angle between the two first radial slots is α2, where α2 = k1 × α1. Wherein, k1 satisfies: 2.1≤k1≤2.5, and the angle between the straight segments of the two first radial slots that are close to each other forms the polar arc angle of the first magnet slot group.

12. The rotor core according to claim 11, characterized in that, α1=(k3×180°) / p, where k3 satisfies: 0.55≤k3≤0.65, and p is the number of poles of the motor.

13. The rotor core according to claim 10, characterized in that, The polar arc angle of the second magnetic slot group is α3, and the angle between the two second radial slots is α4, where α4 = k2 × α3. Wherein, k2 satisfies: 5.5≤k2≤5.9, and the angle between the straight segments of the two second radial slots that are close to each other forms the polar arc angle of the second magnet slot group.

14. The rotor core according to claim 13, characterized in that, α3=(k4×180°) / p, where k4 satisfies: 0.3≤k4≤0.35, and p is the number of poles of the motor.

15. The rotor core according to claim 2, characterized in that, The magnet groove includes a receiving groove and a stress buffer groove. The receiving groove is used to install the magnet, and the stress buffer groove is connected to the receiving groove.

16. The rotor core according to claim 15, characterized in that, There are multiple stress buffer grooves, which are arranged at intervals in the circumferential direction of the receiving groove.

17. The rotor core according to claim 1, characterized in that, The rotor core is further provided with a rotor auxiliary groove on its radially outer peripheral wall, and the rotor auxiliary groove penetrates the rotor core along the axial direction of the rotor core.

18. A rotor assembly, characterized in that, include: The rotor core according to any one of claims 2-17; A magnet, wherein the magnet is disposed in the magnet groove.

19. An electric motor, characterized in that, include: The rotor assembly as claimed in claim 18.

20. A drive assembly, characterized in that, include: The motor according to claim 19.

21. A vehicle, characterized in that, include: The motor of claim 19 or the drive assembly of claim 20.

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