Rotor lamination, rotor of electric machine and electric machine

Abstract

The application relates to the technical field of new energy automobile power assemblies, in particular to a rotor lamination, a rotor of a motor and the motor, which comprises an inner rotor lamination installed on a rotor shaft and an outer rotor lamination sleeved on the outer circumferential surface of the inner rotor lamination; the outer rotor lamination is in key connection with the inner rotor lamination, so that the inner rotor lamination and the outer rotor lamination can rotate synchronously with the rotor shaft; a damping material layer is arranged between the outer circumferential surface of the inner rotor lamination and the inner circumferential surface of the outer rotor lamination; after the inner circumferential surface of the outer rotor lamination is sleeved on the outer circumferential surface of the inner rotor lamination, the inner circumferential surface of the outer rotor lamination does not directly contact the outer circumferential surface of the inner rotor lamination, the transmission path of structural vibration between the outer rotor lamination and the inner rotor lamination is cut off, the structural vibration is buffered and absorbed in the damping material layer, and the structural vibration can be greatly attenuated, so that the purposes of vibration isolation and noise reduction are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new energy vehicle power assembly, in particular to a rotor lamination, a rotor of a motor and the motor. BACKGROUND

[0002] The NVH performance of a new energy vehicle is an important indicator in the new energy vehicle industry. The new energy vehicle replaces the traditional fuel driving system with a main drive system (motor, controller and reduction box). The new energy vehicle does not have the noise of the traditional fuel driving system, but it also brings new problems. The most common problem is that when the new energy vehicle is running, the main drive motor in the main drive system will generate electromagnetic force and gear slot torque during high-speed rotation. The excitation force will directly generate strong vibration through the rotor and stator structure and radiate noise vibration through the shell. When the electromagnetic excitation frequency generated by the main drive motor is the same as the modal frequency of the motor rotor and the stator assembly (stator and shell), resonance occurs, which amplifies the motor noise and vibration. When the main drive system is installed on the vehicle, the electromagnetic noise and vibration generated by the main drive motor will be transmitted to the vehicle frame in contact with it, to the vehicle body and seat; in the process of vibration transmission, due to the effect of resonance, the vibration and noise transmitted to the vehicle body and seat are larger, and the sound can also be directly radiated to the vehicle interior through the vehicle interior panel. Therefore, slight vibration of the motor can affect the experience of the driver and passengers, which is not conducive to health in the long run. Therefore, it is necessary to improve the structure of the motor to reduce the motor noise and vibration from the excitation source, and to improve the influence of the motor on the vehicle noise and vibration and to improve the comfort of passengers. SUMMARY

[0003] The present application provides a rotor lamination, a rotor of a motor and the motor to improve the influence of the existing motor on the vehicle noise and vibration.

[0004] The technical scheme adopted by the present application is as follows: a rotor lamination, comprising an inner rotor lamination and an outer rotor lamination sleeved on the outer circumferential surface of the inner rotor lamination; a damping material layer is arranged between the inner rotor lamination and the outer rotor lamination, and the damping material layer is used to absorb and reduce the vibration transmission between the inner rotor lamination and the outer rotor lamination; the inner rotor lamination, the outer rotor lamination and the damping material layer are fixedly connected, and a plurality of groups of magnetic steel grooves are arranged on the outer rotor lamination in a circumferential direction.

[0005] The inner rotor lamination and the outer rotor lamination are separated by arranging the damping material layer between the outer circumferential surface of the inner rotor lamination and the inner circumferential surface of the outer rotor lamination, so that the vibration caused by the inner rotor lamination is buffered and absorbed by the damping material layer, and when the vibration is transmitted to the outer rotor lamination, the energy is reduced and the mode of the entire rotor lamination cannot be excited; at the same time, the vibration caused by the outer rotor lamination is buffered and absorbed by the damping material layer, and when the vibration is transmitted to the inner rotor lamination, the energy is reduced and the mode of the entire rotor lamination cannot be excited; thereby achieving the purpose of shock absorption and noise reduction; and further reducing the motor noise vibration from the excitation source, improving the influence of the motor on the vehicle noise vibration, and improving the comfort of passengers.

[0006] Further, at least one first key groove is arranged on the inner circumferential surface of the outer rotor lamination, and a second key groove corresponding in number and position to the first key groove is arranged on the outer circumferential surface of the inner rotor lamination; a connecting key is arranged in the first key groove and the corresponding second key groove.

[0007] Further, a plurality of first key grooves are arranged on the inner circumferential surface of the outer rotor lamination, and the plurality of first key grooves are distributed in a circumferential direction.

[0008] Further, the connecting key comprises a connecting portion connected to the key groove in an axial direction, and a slot is arranged on the connecting portion in a radial direction.

[0009] By arranging the slot on the connecting portion in the radial direction, the inner rotor lamination and the outer rotor lamination can be tightly matched by the connecting key, and the connecting stiffness of the inner rotor lamination and the outer rotor lamination can be changed by adjusting the number of slots and the interval distance between the slots, so that the stiffness and modal frequency of the entire rotor can be changed. Through the control of the stiffness and modal frequency of the rotor, the purpose of shock absorption and noise reduction can be achieved.

[0010] Further, the connecting portion comprises a first connecting portion, a second connecting portion and a third connecting portion arranged in a radial direction; a plurality of slots are arranged in an axial direction; and the slots are arranged on the first connecting portion.

[0011] By arranging the connecting portion to comprise a first connecting portion, a second connecting portion and a third connecting portion arranged in a radial direction, the first connecting portion and the third connecting portion are used for cooperating with the key groove (i.e. the first connecting portion is arranged in the first key groove, and the third connecting portion is arranged in the second key groove, or the first connecting portion is arranged in the second key groove, and the third connecting portion is arranged in the first key groove), and the second connecting portion is arranged in the damping material layer and connected between the first connecting portion and the third connecting portion.

[0012] Further, the connecting portion of the connecting key comprises a wedge structure.

[0013] By setting the connecting part of the connecting key as a wedge structure, compared with the conventional key connection mode, the inner rotor lamination and the outer rotor lamination can be connected by the key, and the inner rotor lamination and the outer rotor lamination can be synchronously rotated around the axis while the relative displacement of the outer rotor lamination and the inner rotor lamination in the radial direction is reduced, and the inner rotor lamination and the outer rotor lamination can be tightly matched.

[0014] Further, a plurality of weight-removing holes are formed in the inner rotor lamination, and the plurality of weight-removing holes are arranged at intervals along the circumferential direction of the inner rotor lamination.

[0015] By setting the weight-removing holes, the weight of the inner rotor lamination can be reduced to achieve lightweight.

[0016] Further, a reinforcing rib is arranged in each of the weight-removing holes.

[0017] Due to the weight-removing holes formed in the inner rotor lamination, the elliptical modal frequency of the inner rotor lamination is relatively low, which may cause resonance of the rotor elliptical mode excited by the motor tooth slot torque at high speed, and thus increase the noise and vibration of the motor.

[0018] The inner rotor lamination is formed by one-time stamping of a silicon steel sheet, and the reinforcing rib is integrally formed in the weight-removing hole in the process of the one-time stamping. Under the centrifugal force caused by high-speed rotation of the inner rotor lamination, the reinforcing rib can support the weight-removing hole, increase the overall rigidity of the inner rotor lamination, and thus increase the elliptical modal natural frequency of the inner rotor lamination to avoid resonance and reduce the noise and vibration of the motor.

[0019] The structure of the reinforcing rib can include various modes, such as but not limited to:

[0020] 1. A triangular reinforcing rib is arranged between the diagonal sides of the weight-removing hole.

[0021] 2. A “V”-shaped reinforcing rib is arranged between the opposite sides of the weight-removing hole, and the horn of the “V”-shaped reinforcing rib faces the central axis of the inner rotor lamination or the outer circumferential surface of the inner rotor lamination.

[0022] 3. A “U”-shaped reinforcing rib is arranged between the opposite sides of the weight-removing hole, and the opening of the “U”-shaped reinforcing rib faces the central axis of the inner rotor lamination or the outer circumferential surface of the inner rotor lamination.

[0023] 4. A reinforcing rib is arranged in the weight-removing hole to divide the weight-removing hole into a first weight-removing hole and a second weight-removing hole.

[0024] 5、In the said weight-removing hole, two reinforcing ribs are arranged along the radial direction of the hole, and the side edges of the two reinforcing ribs form an included angle.

[0025] Further, a plurality of weight-removing holes are arranged on the inner rotor punching sheet, and the weight-removing holes are arranged at intervals along the circumferential direction of the inner rotor punching sheet, and two reinforcing ribs are arranged in the weight-removing hole along the radial direction of the hole, and the side edges of the two reinforcing ribs form an included angle.

[0026] Further, a plurality of inclined pole positioning holes are arranged on the inner rotor punching sheet, and the inclined pole positioning holes are arranged at intervals along the circumferential direction of the inner rotor punching sheet.

[0027] The inclined pole positioning holes arranged on the inner rotor punching sheet can optimize the size of electromagnetic force when the rotor uses inclined poles, can reduce electromagnetic excitation, and thus achieve the purpose of shock absorption and noise reduction.

[0028] Further, each group of magnetic steel grooves comprises two groove units for mounting permanent magnets, and the two groove units are arranged in a V shape on the rotor punching sheet.

[0029] The application further provides a rotor of a motor, comprising a rotor core and a permanent magnet, wherein the rotor core is stacked along the axial direction by a plurality of rotor punching sheets provided by the application, and the permanent magnet is mounted in the magnetic steel groove of the plurality of rotor punching sheets.

[0030] Further, at least one connecting key connects the plurality of rotor punching sheets along the axial direction.

[0031] The application further provides a motor, comprising a rotor shaft, a shell, a stator fixedly mounted in the shell, and a rotor provided by the application.

[0032] The application further provides a motor, comprising a rotor shaft, a shell, a permanent magnet, a stator fixedly mounted in the shell, and a rotor stacked along the axial direction by a plurality of rotor punching sheets provided by the application, wherein the permanent magnet is mounted in the magnetic steel groove of the plurality of rotor punching sheets.

[0033] Further, the inner circumferential surface of the shell is sleeved on the outer circumferential surface of the stator and is in interference fit with the outer circumferential surface of the stator.

[0034] Through the above technical features, the shell and the stator are installed in a hot sleeve manner, the inner circumferential surface of the shell is in interference fit with the outer circumferential surface of the stator, the overall rigidity of the stator and the shell can be increased by using interference fit, the elliptical modal frequency is improved, and the technical effect of shock absorption and noise reduction is achieved.

[0035] Further, a plurality of heat dissipation water channels are arranged in the shell.

[0036] By arranging the heat dissipation water channels, the motor can absorb and remove the heat generated during the operation of the motor through the outside circulating water in the heat dissipation water channels, thereby reducing the working temperature of the motor. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the present application, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0038] Figure 1 It is a structure schematic diagram of the rotor lamination in Example 1.

[0039] Figure 2 It is a structure schematic diagram of the inner rotor lamination in Example 1.

[0040] Figure 3 It is a structure schematic diagram of the outer rotor lamination in Example 1.

[0041] Figure 4 It is a structure schematic diagram of the connecting key in Example 1 and Example 2.

[0042] Figure 5 It is a cross-sectional view of the motor in Example 3.

[0043] Figure 6 It is a cross-sectional view of the shell and the stator of the motor in Example 3.

[0044] Wherein: 1 - inner rotor lamination, 2 - outer rotor lamination, 3 - connecting key, 4 - damping material layer, 5 - permanent magnet, 6 - shell, 7 - stator, 8 - rotor shaft.

[0045] 11 - second key groove, 12 - weight removal hole, 13 - reinforcing rib, 14 - inclined pole positioning hole.

[0046] 21 - magnetic steel groove, 22 - first key groove.

[0047] 211 - slot type unit.

[0048] 31 - first connecting part, 32 - second connecting part, 33 - third connecting part.

[0049] 311 - first connecting subpart.

[0050] 61 - heat dissipation water channel. DETAILED DESCRIPTION

[0051] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0052] Example 1:

[0053] like Figure 1 As shown, this embodiment 1 provides a rotor lamination, including an inner rotor lamination 1 and an outer rotor lamination 2 sleeved on the outer circumferential surface of the inner rotor lamination 1; a damping material layer 4 is provided between the inner rotor lamination 1 and the outer rotor lamination 2, the damping material layer 4 is used to absorb and reduce the vibration transmission between the inner rotor lamination 1 and the outer rotor lamination 2; the inner rotor lamination 1, the outer rotor lamination 2 and the damping material layer 4 are fixedly connected, and multiple sets of magnetic steel grooves 21 are provided at intervals along the circumferential direction on the outer rotor lamination 2.

[0054] The damping material layer 4 can be made of viscoelastic materials such as plastics, rubber and various polymer compounds, which have a damping and buffering effect relative to the inner rotor lamination 1 and the outer rotor lamination 2.

[0055] Preferably, the damping material layer 4 and the outer peripheral surface of the inner rotor lamination 1 are integral structures, or the damping material layer 4 and the inner peripheral surface of the outer rotor lamination 2 are integral structures, or the damping material layer 4 and the outer peripheral surface of the inner rotor lamination 1 and the inner peripheral surface of the outer rotor lamination 2 are integral structures.

[0056] Preferably, the damping material layer 4 is disposed in the gap between the inner rotor lamination 1 and the outer rotor lamination 2 by injection molding or vulcanization.

[0057] By setting a damping material layer 4 between the outer circumferential surface of the inner rotor lamination 1 and the inner circumferential surface of the outer rotor lamination 2, the inner rotor lamination 1 and the outer rotor lamination 2 are isolated. This allows the vibration caused by the inner rotor lamination 1 to be buffered and absorbed by the damping material layer 4, resulting in reduced energy when transmitted to the outer rotor lamination 2, thus preventing the excitation of the entire rotor lamination's modes. Simultaneously, the vibration caused by the outer rotor lamination 2 is also buffered and absorbed by the damping material layer 4, resulting in reduced energy when transmitted to the inner rotor lamination 1, also preventing the excitation of the entire rotor lamination's modes. This achieves the purpose of vibration reduction and noise reduction, thereby reducing motor noise and vibration from the excitation source, improving the motor's impact on the overall vehicle noise and vibration, and enhancing passenger comfort.

[0058] like Figures 1 to 4 As shown, at least one first keyway 22 is provided on the inner circumferential surface of the outer rotor lamination 2 (in this embodiment 1, the number of first keyways 22 is 4), and a second keyway 11 with the same number and corresponding position as the first keyway 22 is provided on the outer circumferential surface of the inner rotor lamination 1; a connecting key 3 is installed in the first keyway 22 and its corresponding second keyway 11.

[0059] like Figure 3As shown, the inner circumferential surface of the outer rotor lamination 2 is provided with a plurality of first keyways 22 (in this embodiment 1, the number of first keyways 22 is 4), and the plurality of first keyways 22 are distributed at intervals along the circumferential direction (in this embodiment 1, preferably, the 4 first keyways 22 are evenly distributed along the circumferential direction); the outer circumferential surface of the inner rotor lamination 1 is provided with second keyways 11, which are the same number as the first keyways 22 and are located in the same position;

[0060] like Figure 4 As shown, the connecting key 3 includes a connecting part that is axially connected to the keyway, and a groove is formed on the connecting part in the radial direction.

[0061] By creating radial slots on the connecting part 3, it is possible to ensure that the inner rotor lamination 1 and the outer rotor lamination 2 can fit tightly together via the connecting key 3. Furthermore, by adjusting the number of slots and the spacing between them, the connection stiffness of the inner rotor lamination 1 and the outer rotor lamination 2 can be changed, thereby altering the overall rotor stiffness and modal frequency. Controlling the rotor stiffness and modal frequency also achieves the purpose of vibration reduction and noise reduction.

[0062] like Figure 4 As shown, the connecting part includes a first connecting part 31, a second connecting part 32 and a third connecting part 33 arranged radially; multiple grooves are arranged axially; the grooves are arranged on the first connecting part.

[0063] By including a first connecting portion 31, a second connecting portion 32, and a third connecting portion 33 arranged radially, the first connecting portion 31 and the third connecting portion 33 are used to mate with a keyway (i.e., the first connecting portion 31 is installed in the first keyway 22 and the third connecting portion 33 is installed in the second keyway 11, or the first connecting portion 31 is installed in the second keyway 11 and the third connecting portion 33 is installed in the first keyway 22), the second connecting portion 32 is placed in the damping material layer and connected between the first connecting portion 31 and the third connecting portion 33.

[0064] like Figure 4 As shown, in this embodiment 1, preferably, the groove divides the first connecting portion 31 into a plurality of first connecting sub-portions 311 arranged at intervals along the axial direction.

[0065] The connection stiffness between the inner rotor lamination and the outer rotor lamination can be changed by adjusting the number of slots and the spacing between them.

[0066] like Figure 4 As shown, the connecting part of the connecting key 3 includes a wedge-shaped structure.

[0067] By setting the connecting part of the connecting key 3 as a wedge-shaped structure, compared with the conventional key connection mode, the inner rotor lamination 1 and the outer rotor lamination 2 can be rotated synchronously around the axis while reducing the relative displacement of the outer rotor lamination 2 and the inner rotor lamination 1 in the radial direction, so that the inner rotor lamination 1 and the outer rotor lamination 2 can be tightly matched.

[0068] In this embodiment 1, the first connecting part 31 (i.e., each first connecting sub-part 311) and the third connecting part 33 of the linking key 3 are both wedge-shaped structures.

[0069] As shown in Figure 2 , the inner rotor lamination 1 is provided with a plurality of weight-removing holes 12, and the plurality of weight-removing holes 12 are arranged at intervals along the circumferential direction of the inner rotor lamination 1 (in this embodiment 1, preferably, the plurality of weight-removing holes 12 are uniformly arranged along the circumferential direction of the inner rotor lamination 1).

[0070] By setting the weight-removing hole 12, the weight of the inner rotor lamination 1 can be reduced to achieve lightweight.

[0071] As shown in Figure 2 , the weight-removing hole 12 is provided with a reinforcing rib 13.

[0072] Due to the weight-removing hole 12 provided on the inner rotor lamination 1, the elliptical modal frequency of the inner rotor lamination 1 will be relatively low, which will cause the motor to resonate when the motor slot torque excites the rotor elliptical mode at high speed, thereby increasing the noise and vibration of the motor.

[0073] The inner rotor lamination 1 is formed by one-time stamping of a silicon steel sheet, and the reinforcing rib 13 is integrally formed in the weight-removing hole 12 during the aforementioned one-time stamping process. Under the action of the centrifugal force caused by high-speed rotation of the inner rotor lamination 1, the reinforcing rib 13 can form a supporting action on the weight-removing hole 12, so that the overall stiffness of the inner rotor lamination 1 can be increased, thereby increasing the elliptical modal natural frequency of the inner rotor lamination 1, avoiding resonance, and thereby reducing the noise and vibration of the motor.

[0074] The structure of the reinforcing rib 13 can include various forms, such as but not limited to:

[0075] 1. A triangular reinforcing rib is arranged between the diagonal sides of the weight-removing hole 12;

[0076] 2. A "V"-shaped reinforcing rib is arranged between the opposite two sides of the weight-removing hole 12, and the horn of the "V"-shaped reinforcing rib faces the central axis of the inner rotor lamination 1 or the outer circumferential surface of the inner rotor lamination 1;

[0077] 3. A "U"-shaped reinforcing rib is arranged between two opposite sides of the weight-removing hole 12, and the opening of the "U"-shaped reinforcing rib faces the central axis of the inner rotor punching sheet 1 or the outer circumferential surface of the inner rotor punching sheet 1;

[0078] 4. A reinforcing rib is arranged in the weight-removing hole 12, and the weight-removing hole 12 is divided into a first weight-removing hole and a second weight-removing hole.

[0079] 5. Two reinforcing ribs are arranged in the weight-removing hole 12 along the radial direction of the hole, and the sides of the two reinforcing ribs form an included angle.

[0080] In the present embodiment 1, as shown in Figure 2 , a plurality of weight-removing holes 12 are arranged on the inner rotor punching sheet 1, and the plurality of weight-removing holes 12 are arranged at intervals along the circumferential direction of the inner rotor punching sheet 1. Two reinforcing ribs 13 are arranged in the weight-removing hole 12 along the radial direction of the hole, the sides of the two reinforcing ribs 13 form an included angle, and form a "V"-shaped, and the opening of the "V"-shaped faces the outer circumferential surface of the inner rotor punching sheet 1.

[0081] As shown in Figure 2 , a plurality of inclined pole positioning holes 14 are arranged on the inner rotor punching sheet 1, and the plurality of inclined pole positioning holes 14 are arranged at intervals along the circumferential direction of the inner rotor punching sheet 1 (in the present embodiment 1, the plurality of inclined pole positioning holes 14 are uniformly arranged along the circumferential direction of the inner rotor punching sheet 1).

[0082] The inclined pole positioning hole 14 is arranged on the inner rotor punching sheet 1, and after the rotor uses the inclined pole, the size of the electromagnetic force is optimized, the electromagnetic excitation is reduced, and the purpose of shock absorption and noise reduction is achieved.

[0083] As shown in Figure 3 , each group of magnetic steel grooves 21 includes two slot units 211 for mounting permanent magnets 5, and the two slot units 211 are arranged in a V-shaped manner on the rotor punching sheet.

[0084] Embodiment 2

[0085] The present embodiment 2 provides a rotor of a motor, which includes a rotor core and a permanent magnet 5, the rotor core is stacked by a plurality of rotor punching sheets provided in the embodiment 1 along the axial direction; and the permanent magnet 5 is mounted in the magnetic steel groove 21 of the plurality of rotor punching sheets.

[0086] In the present embodiment 2, at least one connecting key 3 (as shown in Figure 4 ) connects the plurality of rotor punching sheets along the axial direction.

[0087] Embodiment 3

[0088] The present embodiment 3 provides a motor, as shown in Figure 5 and Figure 6 , which includes a rotor shaft 8, a housing 6, a stator 7 fixedly mounted in the housing 6, and a rotor of a motor provided according to the embodiment 2.

[0089] Or in another way:

[0090] The embodiment 3 provides a motor, as shown in Figure 5 and Figure 6 The rotor shaft 8, the shell 6, the permanent magnet 5, the stator 7 fixedly installed in the shell 6 and the rotor provided according to the rotor sheet provided in the embodiment 1 are axially stacked, and the permanent magnet 5 is installed in the magnetic steel slot 21 of the plurality of rotor sheets.

[0091] Preferably, in the embodiment 3, the inner circumferential surface of the shell 6 is sleeved on the outer circumferential surface of the stator 7 and is in interference fit with the outer circumferential surface of the stator 7.

[0092] Through the above technical features, the shell 6 and the stator 7 are installed in a hot sleeve manner, the inner circumferential surface of the shell 6 is in interference fit with the outer circumferential surface of the stator 7, the overall rigidity of the stator 7 and the shell 6 can be increased by using the interference fit manner, the elliptical modal frequency is improved, and the technical effects of shock absorption and noise reduction are achieved.

[0093] Preferably, in the embodiment 3, as shown in Figure 5 and Figure 6 A plurality of heat dissipation water channels 61 are arranged in the shell 6.

[0094] Through the arrangement of the heat dissipation water channel 61, the motor can absorb and take away the heat generated in the motor operation process through the circulating water in the heat dissipation water channel 61, and the working temperature of the motor is reduced.

[0095] Through the present application, a rotor sheet, a rotor of a motor and a motor are provided, and at least the following technical effects or advantages are achieved:

[0096] 1. The damping material layer 4 is arranged between the outer circumferential surface of the inner rotor sheet 1 and the inner circumferential surface of the outer rotor sheet 2, so that the vibration caused by the inner rotor sheet 1 is buffered and absorbed by the damping material layer 4, and when the vibration is transmitted to the outer rotor sheet 2, the energy is reduced, and the modal of the entire rotor sheet cannot be excited; at the same time, the vibration caused by the outer rotor sheet 2 is buffered and absorbed by the damping material layer 4, and when the vibration is transmitted to the inner rotor sheet 1, the energy is reduced, and the modal of the entire rotor sheet cannot be excited; thereby the purpose of shock absorption and noise reduction is achieved; and the motor noise vibration is reduced from the excitation source, the influence of the motor on the vehicle noise vibration is improved, and the comfort of passengers is improved.

[0097] 2、Through setting the slot on the connecting part 3 along the radial direction, the inner rotor punching sheet 1 and the outer rotor punching sheet 2 can be tightly matched through the connecting key 3, and the connecting stiffness of the inner rotor punching sheet 1 and the outer rotor punching sheet 2 can be changed by adjusting the number of the slots and the interval distance between the slots, so that the stiffness and the modal frequency of the whole rotor can be changed. Through the control of the stiffness and the modal frequency of the rotor, the purpose of shock absorption and noise reduction can be achieved.

[0098] 3、Through setting the connecting part of the connecting key 3 as a wedge type structure, compared with the conventional key connection mode, the inner rotor punching sheet 1 and the outer rotor punching sheet 2 can be connected, so that the inner rotor punching sheet 1 and the outer rotor punching sheet 2 can be synchronously rotated around the axis, and the relative displacement of the outer rotor punching sheet 2 and the inner rotor punching sheet 1 in the radial direction is reduced, so that the inner rotor punching sheet 1 and the outer rotor punching sheet 2 can be tightly matched.

[0099] 4、Through the integral forming of the reinforcing rib 13 in the weight-removing hole 12 in the process of the aforementioned one-time stamping forming, the reinforcing rib 13 can form the supporting action on the weight-removing hole 12 under the centrifugal force caused by the high-speed rotation of the inner rotor punching sheet 1, so that the overall stiffness of the inner rotor punching sheet 1 can be increased, the elliptical modal natural frequency of the inner rotor punching sheet 1 is improved, the resonance is avoided, and the motor noise and vibration are reduced.

[0100] 5、The inclined pole positioning hole 14 is arranged on the inner rotor punching sheet 1, when the rotor uses the inclined pole, the size of the electromagnetic force is optimized, the electromagnetic excitation is reduced, and the purpose of shock absorption and noise reduction is achieved.

[0101] 6、The shell 6 and the stator 7 are installed through the hot sleeve mode, the inner circumferential surface of the shell 6 is in interference fit with the outer circumferential surface of the stator 7, the overall stiffness of the stator 7 and the shell 6 is increased through the interference fit mode, the elliptical modal frequency is improved, and the technical effect of shock absorption and noise reduction is achieved.

[0102] 7、Through setting the heat dissipation water channel 61, the motor can absorb and take away the heat generated in the operation process of the motor through the outside circulating water in the heat dissipation water channel 61, and the working temperature of the motor is reduced.

[0103] The above is only the specific application example of the application, and does not constitute any limitation on the protection scope of the application, and any technical scheme formed by the equivalent transformation or equivalent replacement falls within the protection scope of the application.

Claims

1. A rotor lamination, characterized in that: It includes an inner rotor lamination and an outer rotor lamination sleeved on the outer circumferential surface of the inner rotor lamination; a damping material layer is provided between the inner rotor lamination and the outer rotor lamination, the damping material layer is used to absorb and reduce the vibration transmission between the inner rotor lamination and the outer rotor lamination; the inner rotor lamination, the outer rotor lamination and the damping material layer are fixedly connected, and multiple sets of magnetic steel grooves are provided at intervals along the circumferential direction on the outer rotor lamination; At least one first keyway is provided on the inner circumferential surface of the outer rotor lamination, and a second keyway is provided on the outer circumferential surface of the inner rotor lamination, which has the same number of second keyways and corresponding positions as the first keyways; a connecting key is installed in the first keyway and the corresponding second keyway. The connecting key includes a connecting part that is axially connected to a keyway. The connecting part has a groove along the radial direction, and the connection stiffness between the inner rotor lamination and the outer rotor lamination can be changed by adjusting the number of the grooves and the spacing between the grooves. The connecting portion includes a first connecting portion, a second connecting portion, and a third connecting portion arranged radially; multiple grooves are arranged axially; the grooves are arranged on the first connecting portion.

2. The rotor lamination according to claim 1, characterized in that: The connecting part of the connecting key includes a wedge-shaped structure.

3. The rotor lamination according to claim 1, characterized in that: The inner rotor lamination has multiple de-weighting holes, which are spaced apart circumferentially along the inner rotor lamination. Two reinforcing ribs are arranged radially inside each de-weighting hole, and the sides of the two reinforcing ribs form an included angle.

4. The rotor lamination according to claim 1, characterized in that: The inner rotor lamination has multiple oblique pole positioning holes, which are spaced apart circumferentially along the inner rotor lamination.

5. A rotor for an electric motor, characterized in that: It includes a rotor core and a permanent magnet, wherein the rotor core is formed by stacking a plurality of rotor laminations along its axial direction according to any one of claims 1-4; and the permanent magnet is installed in the magnetic slots of the plurality of rotor laminations.

6. The rotor of the motor as described in claim 5, characterized in that: At least one connecting key connects multiple rotor laminations axially.

7. An electric motor, characterized in that, It includes a rotor shaft, a housing, a stator fixedly installed within the housing, and a rotor of the motor according to claim 5.

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