Motor rotor, motor and vehicle

Abstract

The utility model relates to the technical field of motors, particularly provides a motor rotor, a motor and a vehicle, and aims to solve the problem that the conventional motor rotor is relatively serious in vibration and noise in a high-speed operation process. In order to achieve the purpose, the motor rotor comprises an iron core, the iron core comprises a plurality of punching sheets, the plurality of punching sheets are laminated, the punching sheets are provided with a plurality of magnetic steel groove groups, the plurality of magnetic steel groove groups are uniformly arranged at intervals along the circumferential direction of the punching sheets, and the magnetic steel groove groups are asymmetrical along the radiuses of the punching sheets. The magnetic steel groove group is of an asymmetric structure, so that the magnetic circuit of the motor rotor is improved, the resonance of the motor rotor can be optimized, the NVH characteristic of the motor in the operation process is improved, and the torque ripple and the radial electromagnetic force are reduced.

Description

Technical Field

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

[0002] With the rapid development of electric vehicles, the technology of motors, as one of the key components, is also continuously improving. The demand for motor power density and motor efficiency is getting higher and higher, and the requirements for the speed range and maximum speed of the main drive motor are also getting higher and higher. At present, the drive motors of passenger cars are mainly permanent magnet synchronous motors. For the motor rotor, the main development trend is to increase the maximum speed and reduce leakage magnetic flux. After the leakage magnetic flux of the motor rotor is reduced, the performance and efficiency of the motor can be improved. The most direct manifestation is that the output torque of the motor can be increased. The higher the maximum rotor speed of the motor, the better the power performance and the faster the acceleration. However, as the rotor speed increases, the vibration and noise of the motor are more serious during high-speed operation.

[0003] Therefore, there is an urgent need for a motor rotor, a motor and a vehicle to solve the problem of serious vibration and noise of the existing motor rotor during high-speed operation. Utility Model Content

[0004] The utility model aims to solve the above technical problem, that is, to solve the problem that the existing motor rotor has serious vibration and noise during high-speed operation.

[0005] In a first aspect, the utility model provides a motor rotor, comprising an iron core, wherein the iron core comprises a plurality of punching sheets, the plurality of punching sheets are stacked, the punching sheets are provided with a plurality of groups of magnetic steel slot groups, the plurality of groups of magnetic steel slot groups are evenly spaced along the circumference of the punching sheets, and the magnetic steel slot groups are asymmetric along the radius of the punching sheets.

[0006] In a specific embodiment of the above motor rotor, the magnetic steel slot group includes a first magnetic steel slot, the first magnetic steel slot includes a first sub-slot and a second sub-slot, and the first magnetic steel slot is asymmetric along the radius of the punching sheet.

[0007] In a specific embodiment of the above motor rotor, the magnetic steel slot group includes a first magnetic steel slot and a second magnetic steel slot, and the radius of at least one of the punching sheets in the first magnetic steel slot and the second magnetic steel slot is asymmetric.

[0008] In a specific embodiment of the above-mentioned motor rotor, the first magnetic steel slot is located on the side of the second magnetic steel slot facing the center of the punching sheet; the first magnetic steel slot includes a first sub-slot and a second sub-slot, and the first sub-slot and the second sub-slot are arranged in a V shape; the second magnetic steel slot includes a fourth sub-slot and a fifth sub-slot, and the fourth sub-slot and the fifth sub-slot are arranged in a V shape; or, the first magnetic steel slot includes a first sub-slot and a second sub-slot, and the first sub-slot and the second sub-slot are arranged in a V shape; the second magnetic steel slot is perpendicular to the diameter of the punching sheet; or, the first magnetic steel slot includes a first sub-slot, a second sub-slot and a third sub-slot, and the third sub-slot is located between the first sub-slot and the second sub-slot, and the third sub-slot and the second magnetic steel slot are perpendicular to the diameter of the punching sheet.

[0009] In a specific embodiment of the above-mentioned motor rotor, the punching sheet includes a first magnetic isolation bridge and a second magnetic isolation bridge, the first magnetic isolation bridge is located between the first sub-slot and the outer edge of the punching sheet, the second magnetic isolation bridge is located between the second sub-slot and the outer edge of the punching sheet, and the thickness of the first magnetic isolation bridge is greater than the thickness of the second magnetic isolation bridge.

[0010] In a specific implementation of the above motor rotor, the length of the first sub-slot is smaller than the length of the second sub-slot.

[0011] In a specific embodiment of the above-mentioned motor rotor, the angle between the first sub-slot and the radius is greater than or smaller than the angle between the second sub-slot and the radius, and the radius passes through the intersection of the first sub-slot and the second sub-slot; and / or, one of the first sub-slot and the second sub-slot forms an open structure at the outer edge of the punching sheet; and / or, the first sub-slot and the second sub-slot are connected near the middle of the punching sheet.

[0012] In a specific implementation of the above motor rotor, the outer surface of the iron core is wrapped with a reinforcement layer.

[0013] In a second aspect, the utility model provides a motor, comprising a motor stator and the above-mentioned motor rotor.

[0014] In a third aspect, the utility model provides a vehicle, comprising the above-mentioned motor. .

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] The motor rotor provided by the utility model comprises an iron core, the iron core comprises a plurality of punching sheets, the plurality of punching sheets are stacked, the punching sheets are provided with a plurality of magnetic steel slot groups, the plurality of magnetic steel slot groups are evenly spaced along the circumference of the punching sheets, and the magnetic steel slot groups are asymmetric along the radius of the punching sheets. The magnetic steel slot groups are asymmetric structures, which are helpful to improve the magnetic circuit of the motor rotor, can optimize the resonance of the motor rotor, thereby improving the NVH characteristics of the motor during operation, and reducing torque fluctuations and radial electromagnetic forces.

[0017] Furthermore, the first magnetic steel slot includes a first sub-slot and a second sub-slot, and the first sub-slot and the second sub-slot are connected near the middle of the punching sheet to reduce the magnetic leakage of the rotor; after the magnetic leakage of the motor rotor is reduced, the magnetic field intensity formed by the motor rotor is higher, and the torque applied to the motor rotor by the motor stator through the magnetic field is greater, so that the maximum output torque of the motor is increased and the power performance is better.

[0018] Furthermore, the outer surface of the iron core is wrapped with a reinforcement layer, so that there is a certain inward extrusion prestress inside the iron core of the motor rotor. During the high-speed rotation of the motor rotor, the prestress applied to the iron core by the carbon fiber reinforcement layer can offset part of the centrifugal force generated by the high-speed rotation of the iron core; and the carbon fiber reinforcement layer can also withstand part of the centrifugal force generated by the high-speed rotation of the iron core, helping to share the force of the iron core, so that the iron core can withstand a higher rotation speed, thereby increasing the maximum output speed of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0020] Figure 1 It is a structural schematic diagram of a first exemplary punching sheet provided in the first embodiment of the utility model;

[0021] Figure 2 It is a partial structural schematic diagram of the first exemplary punching sheet provided in the first embodiment of the utility model;

[0022] Figure 3 It is a partial structural schematic diagram of a second exemplary punching sheet provided in the first embodiment of the utility model;

[0023] Figure 4 It is a partial structural schematic diagram of a third exemplary punching sheet provided in the first embodiment of the utility model;

[0024] Figure 5 It is a partial structural schematic diagram of a fourth exemplary punching sheet provided in the first embodiment of the utility model;

[0025] Figure 6 This is a schematic structural diagram of a first exemplary punching sheet provided in the second embodiment of the present utility model;

[0026] Figure 7It is a structural schematic diagram of a second exemplary punching sheet provided in the second embodiment of the present utility model;

[0027] Figure 8 A schematic diagram of the structure of a punching sheet provided in Embodiment 3 of the present invention.

[0028] Description of reference numerals:

[0029] 1. Punching sheet; 11. First limiting part; 12. Second limiting part; 13. First magnetic isolation bridge; 14. Second magnetic isolation bridge; 2. First magnetic steel slot; 21. First sub-slot; 22. Second sub-slot; 23. Stress release slot; 24. Third sub-slot; 3. Permanent magnet; 4. Reinforcement layer; 5. Process hole; 6. Second magnetic steel slot; 61. Fourth sub-slot; 62. Fifth sub-slot. DETAILED DESCRIPTION

[0030] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0031] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0032] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "setting", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] Embodiment 1

[0034] In order to solve the problem that the existing motor rotor has serious vibration and noise during high-speed operation, the utility model provides a motor, including a motor rotor, a motor stator and an end cover. There is a housing cavity inside the motor stator, and the motor rotor is installed in the housing cavity of the motor stator. The motor stator and the motor end cover are detachably connected, and the stator and the end cover are specifically connected by fasteners such as bolts. A bearing is provided between the motor stator and the motor end cover to ensure that the motor stator can rotate relative to the motor end cover. During the operation of the motor, the motor stator is energized to generate an alternating electromagnetic field, and the motor rotor can generate a constant electromagnetic field. Under the driving action of the alternating electromagnetic field, the motor rotor rotates.

[0035] The motor rotor includes an iron core and a rotating shaft, the rotating shaft passes through the middle part of the iron core, and the rotating shaft and the iron core are coaxially arranged. Figure 1 As shown, the iron core includes a plurality of punching sheets 1. The punching sheets 1 are generally silicon steel sheets, which are formed into a desired shape by punching. A plurality of punching sheets 1 of the same shape are aligned and stacked along the axial direction of the rotating shaft to form an iron core. The punching sheets 1 are stacked and pressed together. The tightness and length of the stacking can be determined by those skilled in the art according to the magnetic field density of the motor rotor, and the embodiments of the utility model do not make specific limitations.

[0036] like Figure 1 and Figure 2 As shown, multiple groups of magnetic steel slot groups are evenly arranged in the middle of the punching sheet 1 along the circumferential direction, and permanent magnets 3 are placed in the magnetic steel slot groups. The permanent magnet 3 has a south pole (S pole) and a north pole (N pole). At the same end of the iron core, the permanent magnets 3 placed in two adjacent groups of magnetic steel slot groups present opposite polarities. If the polarity of the permanent magnet 3 placed in one group of magnetic steel slot groups is the south pole, the polarity of the permanent magnet 3 placed in two adjacent groups of magnetic steel slot groups is the north pole. Along the circumferential direction of the iron core, the polarity presented by the permanent magnet 3 placed in each group of magnetic steel slot groups is alternating distribution of the south pole and the north pole. The magnetic steel slot groups are generally arranged in pairs. In the diameter direction of the iron core, the permanent magnets 3 placed in two opposite magnetic steel slot groups have opposite polarities, forming a pair of poles. In the circumferential direction of the iron core, the number of pairs of poles is generally 3 to 6, and the number of pairs of poles in the example of the utility model is 4.

[0037] The permanent magnet 3 is embedded in the magnetic steel slot group, and at least a part of the shape of the magnetic steel slot group matches the permanent magnet 3. The permanent magnet 3 and the magnetic steel slot group are transition fit or interference fit to ensure that the permanent magnet 3 can be firmly fixed on the punching sheet 1. The punching sheet 1 is provided with a first limiting portion 11 and a second limiting portion 12, and the first limiting portion 11 and the second limiting portion 12 are located on the inner surface of the magnetic steel slot group and are protrudingly arranged. When the permanent magnet 3 is embedded in the magnetic steel slot group, the two ends of the permanent magnet 3 are respectively abutted with the first limiting portion 11 and the second limiting portion 12 to limit the position of the permanent magnet 3 in the magnetic steel slot group, so as to ensure that the permanent magnet 3 can be stably embedded in the magnetic steel slot group. In a specific embodiment of the utility model, the first limiting portion 11 and the second limiting portion 12 are arranged on the same inner surface of the magnetic steel slot group. Of course, without departing from the principle of the utility model, the first limiting portion 11 and the second limiting portion 12 can be arranged on different inner surfaces of the magnetic steel slot group, such as two opposite inner surfaces.

[0038] The magnetic steel slot group includes a first magnetic steel slot 2, and the first magnetic steel slot 2 includes a first sub-slot 21 and a second sub-slot 22. The first sub-slot 21 and the second sub-slot 22 are arranged in a V-shape, and the flaring is toward the outer edge of the punching sheet 1. The first sub-slot 21 and the second sub-slot 22 are arranged asymmetrically along the radius of the punching sheet 1. By arranging the first sub-slot 21 and the second sub-slot 22 into an asymmetrical structure, it is helpful to improve the magnetic circuit of the motor rotor, and the resonance of the motor rotor can be optimized, thereby improving the NVH (Noise, Vibration, Harshness) characteristics of the motor during operation, and reducing torque fluctuations and radial electromagnetic forces.

[0039] The punching sheet 1 includes a first magnetic isolation bridge 13 and a second magnetic isolation bridge 14, wherein the first magnetic isolation bridge 13 is located between the first sub-slot 21 and the outer edge of the punching sheet 1, and the second magnetic isolation bridge 14 is located between the second sub-slot 22 and the outer edge of the punching sheet 1. The thickness of the first magnetic isolation bridge 13 is greater than the thickness of the second magnetic isolation bridge 14, so that the first sub-slot 21 and the second sub-slot 22 present an asymmetric structure. The magnetic leakage is limited by saturating the magnetic flux at the first magnetic isolation bridge 13 and the second magnetic isolation bridge 14, reducing the magnetic leakage coefficient of the permanent magnet 3 and improving the utilization rate of the permanent magnet 3. From the perspective of preventing magnetic leakage, the smaller the thickness of the first magnetic isolation bridge 13 and the second magnetic isolation bridge 14, the better the magnetic isolation effect. In addition, the punching sheet 1 can also be formed into a whole by the first magnetic isolation bridge 13 and the second magnetic isolation bridge 14, thereby increasing the maximum speed of the motor rotor and reducing the possibility of mechanical damage or even mechanical destruction of the punching sheet 1 under the action of high-speed centrifugal force.

[0040] In some possible implementations, the length of the first sub-groove 21 is smaller than that of the second sub-groove 22 , so that the thickness of the first magnetic isolation bridge 13 is greater than that of the second magnetic isolation bridge 14 , thereby ensuring that the first sub-groove 21 and the second sub-groove 22 present an asymmetric structure.

[0041] like Figure 3 As shown, in some possible embodiments, the angle α between the first sub-groove 21 and the diameter of the punch 1 is greater than or less than the angle β between the second sub-groove 22 and the diameter of the punch 1. Wherein, the diameter of the punch 1 passes through the intersection of the first sub-groove 21 and the second sub-groove 22. In the case where the first sub-groove 21 and the second sub-groove 22 intersect, the intersection of the first sub-groove 21 and the second sub-groove 22 is the intersection of the center line of the first sub-groove 21 and the center line of the second sub-groove 22; in the case where the first sub-groove 21 and the second sub-groove 22 do not intersect, the intersection of the first sub-groove 21 and the second sub-groove 22 is the intersection of the extension of the center line of the first sub-groove 21 and the center line of the second sub-groove 22. Since the angle α between the first sub-groove 21 and the diameter of the punch 1 and the angle β between the second sub-groove 22 and the diameter of the punch 1 are different, the first sub-groove 21 and the second sub-groove 22 can definitely form an asymmetric structure.

[0042] like Figure 4 As shown, in some possible embodiments, one of the first sub-slot 21 and the second sub-slot 22 forms an open structure at the outer edge of the punching sheet 1, that is, the first magnetic isolation bridge 13 or the second magnetic isolation bridge 14 is eliminated on the punching sheet 1, so that the first sub-slot 21 and the second sub-slot 22 form an asymmetric structure. In addition, after the first magnetic isolation bridge 13 or the second magnetic isolation bridge 14 is eliminated on the punching sheet 1, magnetic leakage can be reduced. After the magnetic leakage of the motor rotor is reduced, the magnetic field strength formed by the motor rotor is higher, and the torque applied to the motor rotor by the motor stator through the magnetic field is greater, so that the maximum output torque of the motor is increased and the power performance is better.

[0043] Of course, in other embodiments, the length of the first sub-groove 21 is different from the length of the second sub-groove 22, the angle α between the first sub-groove 21 and the diameter of the punch 1 is different from the angle β between the second sub-groove 22 and the diameter of the punch 1, and one of the first sub-groove 21 and the second sub-groove 22 forms an open structure at the outer edge of the punch 1. Any two or three of these three situations may exist at the same time, so that the first sub-groove 21 and the second sub-groove 22 present an asymmetric structure.

[0044] like Figure 4 and Figure 5 As shown, in some possible implementations, the first sub-slot 21 and the second sub-slot 22 are connected near the middle of the punching sheet 1. After the first sub-slot 21 and the second sub-slot 22 are connected, the magnetic flux lines of the permanent magnets 3 embedded in the first sub-slot 21 and the second sub-slot 22 converge, which can reduce magnetic leakage, increase the magnetic field strength generated by the motor rotor, and thus increase the maximum output torque of the motor.

[0045] Stress release grooves 23 are provided at the corners of the first sub-groove 21 and the second sub-groove 22 to reduce the stress of the punching sheet 1 at the first sub-groove 21 and the second sub-groove 22, thereby improving the mechanical strength of the punching sheet 1 and enabling it to adapt to a higher rotation speed.

[0046] In the examples of the present invention, the punching sheets 1 are all of an integral structure, and only one punching is required in the process of forming the punching sheets 1, which can simplify the process flow of rotor production and reduce production costs.

[0047] The outer surface of the iron core is wrapped with a reinforcement layer 4, specifically carbon fiber. Through the wrapping of the carbon fiber reinforcement layer 4, a certain amount of inward extrusion prestress exists inside the iron core of the motor rotor. During the high-speed rotation of the motor rotor, the prestress applied to the iron core by the carbon fiber reinforcement layer 4 can offset part of the centrifugal force generated by the high-speed rotation of the iron core. In addition, the carbon fiber reinforcement layer 4 can also withstand part of the centrifugal force generated by the high-speed rotation of the iron core, helping to share the force of the iron core, so that the iron core can withstand a higher rotation speed, thereby increasing the maximum output speed of the motor.

[0048] Of course, without departing from the principle of the present invention, in other embodiments, those skilled in the art may also use other high-strength materials as the reinforcement layer 4, such as ceramic fibers, graphene materials, etc.

[0049] The punching sheet 1 is also provided with a process hole 5, which can reduce the quality of the punching sheet 1 on the one hand, and improve the structural strength of the punching sheet 1 on the other hand. The process hole 5 is specifically located between the first magnetic steel slot 2 and the rotating shaft.

[0050] The utility model also provides a vehicle, comprising the motor as described above, wherein the motor is used to drive the vehicle to travel.

[0051] In summary, the motor rotor provided by the utility model has the following advantages:

[0052] 1. The first magnetic steel slot 2 is an asymmetric structure, which helps to improve the magnetic circuit of the motor rotor and optimize the resonance of the motor rotor, thereby improving the NVH (Noise, Vibration, Harshness) characteristics of the motor during operation and reducing torque fluctuations and radial electromagnetic forces.

[0053] 2. The first sub-slot 21 and the second sub-slot 22 are connected near the middle of the punching sheet 1 to reduce the magnetic leakage of the rotor; after the magnetic leakage of the motor rotor is reduced, the magnetic field strength formed by the motor rotor is higher, and the torque applied to the motor rotor by the motor stator through the magnetic field is greater, so that the maximum output torque of the motor is increased and the dynamic performance is better.

[0054] 3. The outer surface of the iron core is wrapped with a reinforcement layer 4, so that there is a certain prestress of inward extrusion inside the iron core of the motor rotor. During the high-speed rotation of the motor rotor, the prestress applied to the iron core by the carbon fiber reinforcement layer 4 can offset part of the centrifugal force generated by the high-speed rotation of the iron core; and the carbon fiber reinforcement layer 4 can also withstand part of the centrifugal force generated by the high-speed rotation of the iron core, helping to share the force of the iron core, so that the iron core can withstand a higher rotation speed, so as to increase the maximum output speed of the motor.

[0055] 4. The punching sheet 1 is an integrated structure, which can effectively simplify the process flow of rotor production and reduce production costs.

[0056] Embodiment 2

[0057] This embodiment provides a motor rotor, which has a similar structure to the motor rotor provided in the first embodiment, except that the structure of the magnetic steel slot group is different.

[0058] like Figure 6 As shown, in this embodiment, the magnetic steel slot group includes the first magnetic steel slot 2 and the second magnetic steel slot 6 as described in the first embodiment, and the first magnetic steel slot 2 is located on the side of the second magnetic steel slot 6 facing the center of the punching sheet 1. Of course, without departing from the principle of the utility model, those skilled in the art can also arrange the second magnetic steel slot 6 on the side of the first magnetic steel slot 2 facing the center of the punching sheet 1. That is to say, at least one of the two magnetic steel slots in the magnetic steel slot group is arranged asymmetrically along the diameter of the punching sheet 1.

[0059] In some possible embodiments, the structure of the second magnetic steel slot 6 is similar to that of the first magnetic steel slot 2. Specifically, the second magnetic steel slot 6 includes a fourth sub-slot 61 and a fifth sub-slot 62, and the fourth sub-slot 61 and the fifth sub-slot 62 are arranged in a V-shape, and the flaring is directed toward the outer edge of the punching sheet 1. The second magnetic steel slot 6 is symmetrical along the diameter of the punching sheet 1. Among them, there is a magnetic isolation bridge between the fourth sub-slot 61 and the fifth sub-slot 62 and the outer edge of the punching sheet 1, so as to enhance the destructive strength of the punching sheet 1, thereby increasing the maximum allowable output speed of the rotor. Of course, without departing from the principle of the utility model, the fourth sub-slot 61 and the fifth sub-slot 62 can also form an open structure at the outer edge of the punching sheet 1 to reduce the magnetic leakage of the motor rotor, thereby increasing the maximum output torque of the motor.

[0060] like Figure 7As shown, in some possible implementations, the second magnetic steel slot 6 includes a fourth sub-slot 61 and a fifth sub-slot 62, and the fourth sub-slot 61 and the fifth sub-slot 62 are arranged in a V-shape, and the flaring is directed toward the outer edge of the punching sheet 1. The second magnetic steel slot 6 is asymmetric along the diameter of the punching sheet 1, which helps to improve the magnetic circuit of the motor rotor and optimize the resonance of the motor rotor, thereby improving the NVH (Noise, Vibration, Harshness) characteristics of the motor during operation and reducing torque fluctuations and radial electromagnetic forces.

[0061] There are three ways to form an asymmetric structure of the second magnetic steel slot 6. The first is that the lengths of the fourth sub-slot 61 and the fifth sub-slot 62 are different. The second is that the angle between the fourth sub-slot 61 and the diameter of the punching sheet 1 and the angle between the fifth sub-slot 62 and the diameter of the punching sheet 1 are different. The third is that one of the fourth sub-slot 61 and the fifth sub-slot 62 forms an open structure at the outer edge of the punching sheet 1. The second magnetic steel slot 6 can form an asymmetric structure by any one or more of the above three methods.

[0062] In addition, it should be particularly noted that, although in the example of the present invention the magnetic steel slot group includes two groups of magnetic steel slots (the first magnetic steel slot 2 and the second magnetic steel slot 6), this is not a specific limitation of the present invention. Without departing from the principles of the present invention, in other embodiments, those skilled in the art may also set the magnetic steel slot group to multiple groups of magnetic steel slots, such as three groups or more, and the structure of a single group of magnetic steel slots is not limited to the V-shape of the example of the present invention, but may also be any known shape of magnetic steel slots, such as a U-shape or a straight shape, etc., and one of the multiple groups of magnetic steel slots may form an asymmetric structure along the radius of the punching sheet 1.

[0063] In some possible implementations, the second magnetic steel grooves 6 are arranged in a linear shape, and the second magnetic steel grooves 6 are perpendicular to the diameter of the punching sheet 1 .

[0064] The utility model also provides a vehicle, comprising the motor as described above, wherein the motor is used to drive the vehicle to travel.

[0065] Embodiment 3

[0066] This embodiment provides a motor rotor, which has a similar structure to the motor rotor provided in the first embodiment, except that the structure of the magnetic steel slot group is different.

[0067] like Figure 8As shown, in this embodiment, the magnetic steel slot group includes a first magnetic steel slot 2 and a second magnetic steel slot 6. Among them, the first magnetic steel slot 2 includes a first sub-slot 21, a second sub-slot 22 and a third sub-slot 24, and the third sub-slot 24 is located between the first sub-slot 21 and the second sub-slot 22. The first sub-slot 21 and the second sub-slot 22 are asymmetrically arranged along the diameter of the punching sheet 1, which helps to improve the magnetic circuit of the motor rotor and optimize the resonance of the motor rotor, thereby improving the NVH (Noise, Vibration, Harshness) characteristics of the motor during operation and reducing torque fluctuations and radial electromagnetic forces.

[0068] There are three ways in which the first sub-groove 21 and the second sub-groove 22 are asymmetrically arranged along the diameter of the punch 1. The first way is that the lengths of the first sub-groove 21 and the second sub-groove 22 are different. The second way is that the angle between the first sub-groove 21 and the diameter of the punch 1 and the angle between the second sub-groove 22 and the diameter of the punch 1 are different. The third way is that one of the first sub-groove 21 and the second sub-groove 22 forms an open structure at the outer edge of the punch 1. The first sub-groove 21 and the second sub-groove 22 can form an asymmetrical structure by any one or more of the above three methods.

[0069] The third sub-slot 24 and the second magnetic steel slot 6 are arranged in a linear shape and are both perpendicular to the diameter of the punching sheet 1 .

[0070] The utility model also provides a vehicle, comprising the motor as described above, wherein the motor is used to drive the vehicle to travel.

[0071] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A motor rotor, characterized in that: The invention comprises an iron core, wherein the iron core comprises a plurality of punching sheets (1), wherein the plurality of punching sheets (1) are stacked, wherein the punching sheets (1) are provided with a plurality of groups of magnetic steel slot groups, wherein the plurality of groups of magnetic steel slot groups are evenly spaced along the circumference of the punching sheets (1), and wherein the magnetic steel slot groups are asymmetric along the radius of the punching sheets (1).

2. The motor rotor according to claim 1, characterized in that: The magnetic steel slot group comprises a first magnetic steel slot (2), the first magnetic steel slot (2) comprises a first sub-slot (21) and a second sub-slot (22), and the first magnetic steel slot (2) is asymmetric along the radius of the punching sheet (1).

3. The motor rotor according to claim 1, characterized in that: The magnetic steel slot group comprises a first magnetic steel slot (2) and a second magnetic steel slot (6), and the radius of at least one of the punching sheets (1) in the first magnetic steel slot (2) and the second magnetic steel slot (6) is asymmetric.

4. The motor rotor according to claim 3, characterized in that: The first magnetic steel groove (2) is located on a side of the second magnetic steel groove (6) facing the center of the punching sheet (1); The first magnetic steel slot (2) comprises a first sub-slot (21) and a second sub-slot (22), and the first sub-slot (21) and the second sub-slot (22) are arranged in a V shape; the second magnetic steel slot (6) comprises a fourth sub-slot (61) and a fifth sub-slot (62), and the fourth sub-slot (61) and the fifth sub-slot (62) are arranged in a V shape; or, The first magnetic steel slot (2) comprises a first sub-slot (21) and a second sub-slot (22), the first sub-slot (21) and the second sub-slot (22) being arranged in a V-shape; the second magnetic steel slot (6) is perpendicular to the diameter of the punching sheet (1); or, The first magnetic steel slot (2) comprises a first sub-slot (21), a second sub-slot (22) and a third sub-slot (24); the third sub-slot (24) is located between the first sub-slot (21) and the second sub-slot (22); the third sub-slot (24) and the second magnetic steel slot (6) are perpendicular to the diameter of the punching sheet (1).

5. The motor rotor according to claim 2 or 4, characterized in that: The punching sheet (1) comprises a first magnetic isolation bridge (13) and a second magnetic isolation bridge (14); the first magnetic isolation bridge (13) is located between the first sub-slot (21) and the outer edge of the punching sheet (1); the second magnetic isolation bridge (14) is located between the second sub-slot (22) and the outer edge of the punching sheet (1); the thickness of the first magnetic isolation bridge (13) is greater than the thickness of the second magnetic isolation bridge (14).

6. The motor rotor according to claim 5, characterized in that: The length of the first sub-groove (21) is smaller than the length of the second sub-groove (22).

7. The motor rotor according to claim 2 or 4, characterized in that: The included angle between the first sub-groove (21) and the radius is greater than or smaller than the included angle between the second sub-groove (22) and the radius, and the radius passes through the intersection of the first sub-groove (21) and the second sub-groove (22); and / or, One of the first sub-groove (21) and the second sub-groove (22) forms an open structure at the outer edge of the punching sheet (1); and / or, The first sub-groove (21) and the second sub-groove (22) are connected near the middle of the punching sheet (1).

8. The motor rotor according to claim 1, characterized in that: The outer surface of the iron core is wrapped with a reinforcement layer (4).

9. A motor, characterized in that: The invention comprises a motor stator and a motor rotor as claimed in any one of claims 1 to 8.

10. A vehicle, characterized in that: Comprising the motor as claimed in claim 9.

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