Motor stator, motor and vehicle

Abstract

Provided in the present disclosure are a motor stator, a motor and a vehicle. A stator tooth comprises a tooth column, a first tooth tip and a second tooth tip, wherein the first tooth tip is arranged at a first end of the tooth column, the second tooth tip is arranged at a second end of the tooth column, the first end is the opposite end of the second end, and the direction of the connecting line of the shortest distance between the first end and the second end is tangent to the circumferential direction of the motor rotor; and the first tooth tip and the second tooth tip are different in appearance dimension parameters, such that the first tooth tip and the second tooth tip are arranged asymmetrically relative to the tooth column. In this arrangement, the motor stator tooth has an asymmetric structure, such that compared with a conventional motor stator having a symmetrically arranged stator tooth structure, this solution can effectively reduce the noise level of a motor.

Description

Motor stator, motor and vehicle

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure claims priority to Chinese patent application number 202311182989.8 filed with the China Patent Office on September 13, 2023, entitled “STATOR TEETH, MOTOR STATOR, MOTOR AND VEHICLE,” the entire contents of which are incorporated by reference into this disclosure. Technical Field

[0003] The present disclosure relates to the field of vehicle technology, and in particular to a motor stator, a motor, and a vehicle. Background Art

[0004] With the rapid development of the electric vehicle market and technology, electric drive systems are gradually replacing engine systems and gaining widespread application. As the power source for driving vehicles, the technological development of electric motors is reflected not only in indicators such as power density and efficiency, but also in increasingly demanding comfort.

[0005] In existing technical solutions, the stator tooth tips of the motor generally adopt a simple symmetrical structure, that is, the two tooth tips of the motor stator teeth are symmetrical to each other, which easily causes resonance when the motor is working, thereby generating relatively large noise.

[0006] Summary of the Invention

[0007] In order to solve the above technical problems or at least partially solve the above technical problems, the present disclosure provides a motor stator, a motor and a vehicle.

[0008] In a first aspect, the present disclosure provides a motor stator, wherein the motor stator comprises a plurality of stator teeth:

[0009] The stator teeth include a tooth column, a first tooth tip, and a second tooth tip; the first tooth tip is arranged at a first end of the tooth column, the second tooth tip is arranged at a second end of the tooth column, and the first end is opposite to the second end, and the direction of the line connecting the shortest distance between the first end and the second end is tangent to the circumferential direction of the motor rotor;

[0010] The first tooth tip and the second tooth tip have different external dimension parameters, so that the first tooth tip and the second tooth tip are asymmetrically arranged relative to the tooth column, the external dimension parameters including tooth tip length and tooth tip height, and at least some of the plurality of stator teeth have different first tooth tip lengths or first tooth tip heights;

[0011] Among them, the first tooth tip length is the minimum distance between the end of the first tooth tip and the tooth column, the first tooth tip height is the tooth tip height value of the end of the first tooth tip, the head end of the first tooth tip is connected to the tooth column, and the end is the opposite end of the head end.

[0012] Optionally, the first tooth tip length corresponding to the first tooth tip is greater than or less than the second tooth tip length corresponding to the second tooth tip; wherein, the second tooth tip length is the minimum distance between the end of the second tooth tip and the tooth column; the head end of the second tooth tip is connected to the tooth column, and the end of the second tooth tip is the opposite end of the head end of the second tooth tip.

[0013] Optionally, a first tooth tip height corresponding to the first tooth tip is greater than or less than a second tooth tip height corresponding to the second tooth tip;

[0014] Among them, the second tooth tip height is the tooth tip height value at the end of the second tooth tip, the direction corresponding to the first tooth tip height is perpendicular to the direction corresponding to the first tooth tip length and perpendicular to the axial direction of the motor rotor, and the direction corresponding to the second tooth tip height is perpendicular to the direction corresponding to the second tooth tip length and perpendicular to the axial direction of the motor rotor.

[0015] Optionally, the motor stator is formed by multiple groups of stator teeth repeatedly arranged along the circumferential direction; wherein each group of the stator teeth includes at least one stator tooth.

[0016] Optionally, the stator tooth group includes one stator tooth, and the lengths or heights of the first tooth tips of any two stator teeth in the stator tooth group are different;

[0017] Alternatively, the stator teeth group includes at least two stator teeth, and the lengths or heights of the first tooth tips of the stator teeth in each stator teeth group are different.

[0018] Optionally, the stator teeth group includes more than two stator teeth, and for each group of stator teeth groups, the first tooth tip length corresponding to each stator tooth in the stator teeth group is different, and the second tooth tip length corresponding to each stator tooth in the stator teeth group is the same.

[0019] Optionally, the stator teeth group includes more than two stator teeth, and for each group of stator teeth groups, the first tooth tip length corresponding to each stator tooth in the stator teeth group is different, and the second tooth tip length corresponding to each stator tooth in the stator teeth group is different.

[0020] Optionally, the stator tooth group includes one stator tooth, and the first tooth tip lengths corresponding to the stator teeth in any two stator tooth groups are different, and the second tooth tip lengths corresponding to the stator teeth in any two stator tooth groups are the same.

[0021] Optionally, the stator teeth group includes one stator tooth, and the first tooth tip lengths corresponding to the stator teeth in any two stator teeth groups are different, and the second tooth tip lengths corresponding to the stator teeth in any two stator teeth groups are different.

[0022] Optionally, there is a gap between any two adjacent stator teeth;

[0023] The first tooth tip length and / or the second tooth tip length is smaller than a third length; wherein the third length is half of the tooth tip length of the gap between two adjacent stator teeth.

[0024] Optionally, the motor stator is formed by a plurality of groups of stator teeth repeatedly arranged along the circumferential direction;

[0025] Each of the stator teeth groups includes at least one stator tooth.

[0026] Optionally, the stator teeth group includes more than two stator teeth, and for each group of stator teeth groups, the first tooth tip height corresponding to each stator tooth in the stator teeth group is different, and the second tooth tip height corresponding to each stator tooth in the stator teeth group is the same.

[0027] Optionally, the stator teeth group includes more than two stator teeth, and for each group of stator teeth groups, the first tooth tip height corresponding to each stator tooth in the stator teeth group is different, and the second tooth tip height corresponding to each stator tooth in the stator teeth group is different.

[0028] Optionally, the stator tooth group includes one stator tooth, and the first tooth tip heights corresponding to the stator teeth in any two stator tooth groups are different, and the second tooth tip heights corresponding to the stator teeth in any two stator tooth groups are the same.

[0029] Optionally, the stator tooth group includes one stator tooth, and the first tooth tip heights corresponding to the stator teeth in any two stator tooth groups are different, and the second tooth tip heights corresponding to the stator teeth in any two stator tooth groups are different.

[0030] In a second aspect, the present disclosure further provides a motor, comprising the motor stator as described in any one of the first aspects.

[0031] In a third aspect, the present disclosure further provides a vehicle, comprising the motor as described in the second aspect.

[0032] The present disclosure provides a stator tooth, a motor stator, a motor, and a vehicle. The stator tooth includes: a tooth column, a first tooth tip, and a second tooth tip. The first tooth tip is disposed at a first end of the tooth column, and the second tooth tip is disposed at a second end of the tooth column. The first end is opposite to the second end, and the direction of the line connecting the shortest distance between the first end and the second end is tangential to the circumferential direction of the motor rotor. The first tooth tip and the second tooth tip have different external dimensional parameters, and the first tooth tip and the second tooth tip are asymmetrically arranged relative to the tooth column. This arrangement enables the stator teeth of the motor to form an asymmetrical structure. Compared to a conventional motor stator with a symmetrical stator tooth structure, this solution can reduce torque fluctuations and radial electromagnetic forces, which are noise excitation sources during the rotation of the motor. Since torque fluctuations and radial electromagnetic forces are directly related to noise, the lower the torque fluctuations and radial electromagnetic forces, the lower the noise peak amplitude. Therefore, this solution can reduce the noise level of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] FIG1 is a schematic diagram of a stator tooth structure provided by an embodiment of the present disclosure;

[0034] FIG2 is a schematic diagram of another stator tooth structure provided by an embodiment of the present disclosure;

[0035] FIG3 is a schematic diagram showing the change of torque fluctuation with the first per-unit value;

[0036] FIG4 is a schematic diagram showing the change of radial electromagnetic force with the first per-unit value;

[0037] FIG5 is a schematic diagram showing the variation of average torque and peak-to-peak torque fluctuations with the first per-unit value;

[0038] FIG6 is a schematic diagram of a motor stator structure provided by an embodiment of the present disclosure;

[0039] FIG7 is a schematic diagram of another motor stator structure provided by an embodiment of the present disclosure;

[0040] FIG8 is a schematic diagram of another motor stator structure provided by an embodiment of the present disclosure;

[0041] FIG9 is a schematic diagram of another motor stator structure provided by an embodiment of the present disclosure;

[0042] FIG10 is a schematic diagram of another motor stator structure provided by an embodiment of the present disclosure;

[0043] FIG11 is a schematic diagram of another stator tooth structure provided by an embodiment of the present disclosure;

[0044] FIG12 is a schematic diagram showing the change of torque fluctuation with the second per-unit value;

[0045] FIG13 is a schematic diagram showing the change of radial electromagnetic force with the second per-unit value;

[0046] FIG14 is a schematic diagram showing the variation of average torque and peak-to-peak torque fluctuations with the second per-unit value;

[0047] FIG15 is a schematic diagram of another motor stator structure provided by an embodiment of the present disclosure;

[0048] FIG16 is a schematic diagram of another motor stator structure provided by an embodiment of the present disclosure;

[0049] FIG17 is a schematic diagram of another motor stator structure provided by an embodiment of the present disclosure;

[0050] FIG18 is a schematic diagram of another motor stator structure provided by an embodiment of the present disclosure;

[0051] FIG19 is a schematic diagram of another motor stator structure provided in an embodiment of the present disclosure. Specific embodiments

[0052] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features therein can be combined with each other in the absence of conflict.

[0053] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0054] The following is an exemplary description of a stator tooth, a motor stator, a motor, and a vehicle provided by an embodiment of the present disclosure with reference to the accompanying drawings.

[0055] Figure 1 is a schematic diagram of a stator tooth structure provided by an embodiment of the present disclosure; the stator tooth 11 includes: a tooth column 111, a first tooth tip 112 and a second tooth tip 113; the first tooth tip 112 is arranged at the first end of the tooth column 111, and the second tooth tip 113 is arranged at the second end of the tooth column 111, and the first end is opposite to the second end, and the direction of the line connecting the shortest distance between the first end and the second end is tangent to the circumferential direction of the motor rotor; the first tooth tip 112 and the second tooth tip 113 have different appearance size parameters, so that the first tooth tip 112 and the second tooth tip 113 are asymmetrically arranged relative to the tooth column 111.

[0056] When the motor is running under extreme operating conditions (WOT conditions), the speed point of resonance / resonance is usually in the weak magnetic field region. This is the result of the combined effect of the modal of the motor stator structure and the specific order radial force generated by the motor pole slot combination at this operating point. Taking the typical 8-pole 48-slot design of a permanent magnet synchronous motor for drive as an example, in the speed range of 7000rpm to 9000rpm under the WOT condition, the stator zero-order breathing mode and the 48-order radial electromagnetic force will work together to produce a large NVH sound power peak. In fact, the core of the motor stator provided by the embodiment of the present disclosure is to optimize the torque fluctuation and radial electromagnetic force of the noise excitation source by providing a motor stator structure, thereby weakening the noise peak amplitude in this speed range; there is a direct relationship between torque fluctuation and radial electromagnetic force and noise, that is, the lower the torque fluctuation and radial electromagnetic force, the lower the noise.

[0057] After research, the inventors found that the tooth tips of the stator teeth 11 can be set to an asymmetric structure to reduce torque fluctuations and radial electromagnetic forces, thereby reducing the noise generated by the motor.

[0058] As shown in Figure 1, the view corresponding to Figure 1 is a schematic diagram with the axial direction of the motor as the viewing direction; in the figure, R1 represents a part of the circular structure of a side wall of the motor stator, which can also be equivalent to the circumferential direction of the electrode rotor, and in the figure, R2 represents the direction of the line connecting the shortest distance between the first end and the second end, which is obviously tangent to the circumferential direction of the motor rotor, or at least the straight line parallel to it is tangent to the circumferential direction of the motor rotor. An asymmetric structure refers to a difference in the dimensional parameters of the first tooth tip 112 and the second tooth tip 113. Specifically, the first tooth tip 112 and the second tooth tip 113 are not identical and are not symmetrical relative to the tooth column 111. In some possible embodiments, the first tooth tip 112 and the second tooth tip 113 may not be symmetrical relative to R3, where R3 is the centerline of the tooth column 111, the extension of which passes through the center of the electronic rotor. The dimensional parameters refer to the dimensional parameters of the first tooth tip 112 and the second tooth tip 113, such as the tip length, tip height, and even the tip volume. In all of the above examples, the relative position of the motor rotor and the motor stator is fixed. Specifically, the motor stator may be arranged in a ring with a center, and the motor rotor may be arranged within the corresponding ring of the motor stator. Alternatively, the motor rotor may be circular from the perspective of FIG. 1, with the center of the motor stator coinciding with the center of the motor rotor. This arrangement effectively reduces the noise generated by the motor.

[0059] FIG2 is a schematic diagram of another stator tooth structure provided by an embodiment of the present disclosure; wherein Q2 is an enlarged view of the region of Q1; in some embodiments, the appearance dimension parameters include the tooth tip length; the first tooth tip length L corresponding to the first tooth tip 112 LGreater than or less than the second tooth tip length L corresponding to the second tooth tip 113 R ; Among them, the first tooth tip length L L is the minimum distance between the end of the first tooth tip 112 and the tooth column 111, and the second tooth tip length L R It is the minimum distance between the end of the second tooth tip 113 and the tooth column 111; the head ends of the first tooth tip 112 and the second tooth tip 113 are connected to the tooth column 111, and the end ends are opposite to the head ends.

[0060] For example, the embodiment of the present disclosure takes an 8-pole 48-slot motor electromagnetic design as an example, and determines the influence of the tooth tip length on the torque fluctuation and radial electromagnetic force through the electromagnetic simulation optimization method. The embodiment of the present disclosure converts the tooth tip length into the form of a first per-unit value for description, wherein the first per-unit value is the ratio between the first angle ɑ1 and the second angle ɑ2, the second angle ɑ2 is the angle between the center line R4 between two adjacent stator teeth 11 and the center line R3 of the tooth column 111 of one of the stator teeth 11 passing through the center of the rotor, and the first angle ɑ1 is the angle between the line R5 at the end of the stator tooth 11 tangent to the center of the rotor and the center line R4 between the two adjacent stator teeth 11, as shown in Figure 2. It should be noted that due to space limitations, the schematic diagram of R3, R4 and R5 passing through the center of the motor rotor is not fully displayed in the embodiment of the present disclosure, but the first angle ɑ1 and the second angle ɑ2 can still be accurately described through the above description and schematic diagram; that is, the larger the first per-unit value, the actual first tooth tip length L L and / or second tooth tip length L R The larger the value is, the more there is a unique and definite conversion relationship between the two that is a directly proportional function.

[0061] For example, the embodiment of the present disclosure attempts to change only the first tooth tip length L corresponding to the first tooth tip 112. L , the second tooth tip length L corresponding to the second tooth tip 113 R Taking the unchanged as an example to carry out electromagnetic simulation optimization, the first tooth tip length L is actually formed. L Greater or less than the second tooth tip length L Rstructural characteristics; Figure 3 is a schematic diagram of the change of torque fluctuation with the first per-unit value, the horizontal axis in Figure 3 represents the first per-unit value, the vertical axis represents the torque fluctuation, the solid line curve is the 48th order torque fluctuation, and the dotted line curve is the 24th order torque fluctuation; Figure 4 is a schematic diagram of the change of radial electromagnetic force with the first per-unit value, the horizontal axis in Figure 4 represents the first per-unit value, the vertical axis represents the torque fluctuation, the realization curve is the 48th order radial electromagnetic force, and the dotted line curve is the 24th order radial electromagnetic force; Figure 5 is a schematic diagram of the change of average torque and torque fluctuation peak-to-peak value with the first per-unit value, the horizontal axis in Figure 5 represents the first per-unit value, the vertical axis represents the average torque or torque fluctuation peak-to-peak value, the solid line curve is the average torque, and the dotted line curve is the torque fluctuation peak-to-peak value. Based on the curve diagrams of Figures 3 to 5 above, a specific value of the first per-unit value in a possible embodiment can be selected. The principle of selecting the first per-unit value is combined with actual conditions. For a possible embodiment, the motor is in the speed range of 7000rpm to 9000rpm under the WOT condition, and the 48th order radial electromagnetic force and torque fluctuation are mainly optimized. When the first per-unit value is selected in the range of 0.9 to 0.95, the 48th order torque fluctuation and radial electromagnetic force are greatly improved, and the total torque fluctuation is significantly reduced, and the average torque is also greatly improved; that is, the radial electromagnetic force and torque fluctuation should be as small as possible, the peak-to-peak value of the torque fluctuation should be as small as possible, and the average torque needs to be as large as possible.

[0062] Through the above electromagnetic simulation optimization, it can be known that the first tooth tip 112 and the second tooth tip 113 are asymmetrical, so that the length of the first tooth tip L L Greater or less than the second tooth tip length L R It can effectively reduce radial electromagnetic force and torque fluctuations, thereby effectively reducing the noise generated by the motor.

[0063] Based on the embodiments corresponding to FIG. 2 to FIG. 5 , it can be concluded that in some embodiments, there is a gap between any two adjacent stator teeth 11 ; the first tooth tip length L L and / or second tooth tip length L R is smaller than the third length L0 ; wherein the third length L0 is half of the tooth tip length of the gap between two adjacent stator teeth 11 .

[0064] That is, through the above settings, the noise level of the motor can be reduced.

[0065] Figure 6 is a schematic diagram of a motor stator structure provided in an embodiment of the present disclosure; in some embodiments, the motor stator is composed of multiple groups of stator teeth 61 repeatedly arranged in the circumferential direction; wherein each group of stator teeth 61 includes at least one stator tooth 11.

[0066] Exemplarily, the embodiments in FIGS. 1 to 5 above are exemplarily described for a single motor stator tooth 11. However, a motor stator may be composed of multiple stator teeth 11. At least one stator tooth 11 may form a stator tooth group 61, and the stator tooth groups 61 are repeatedly arranged in the circumferential direction of the motor rotor to form the overall structure of the motor stator. Obviously, each stator tooth 11 in each stator tooth group 61 in the motor stator can be the stator tooth 11 in the embodiments in FIGS. 1-5 above, so as to achieve the purpose of reducing the overall noise level of the motor. It should be noted that since only one stator tooth 11 is used to form the stator tooth group 61 in FIG. 6, the stator tooth group 61 and the stator tooth 11 are framed by the same dashed line box in the corresponding schematic diagram of FIG. 6. However, obviously, the two are not the same structure, but the stator tooth group 61 includes the stator tooth 11.

[0067] FIG. 7 is a schematic diagram of another motor stator structure provided by an embodiment of the present disclosure; in some embodiments, the stator tooth group 61 includes more than two stator teeth 11, and for each stator tooth group 61, the first tooth tip length L corresponding to each stator tooth 11 in the stator tooth group 61 L is different, and the second tooth tip length L corresponding to each stator tooth 11 in the stator tooth group 61 R is the same.

[0068] Exemplarily, FIG. 7 takes each stator tooth group 61 including two stator teeth 11 as an example. The motor stator may be repeatedly arranged by the stator tooth groups 61 composed of two stator teeth 11, that is, each stator tooth group 61 in FIG. 7 is the same; each stator tooth group 61 may include a first stator tooth 701 and a second stator tooth 702. Obviously, the first stator tooth 701 and the second stator tooth 702 are both the stator teeth 11 in any one of FIGS. 1 to 5 above, that is, the first tooth tip 112 and the second tooth tip 113 are asymmetrically arranged with respect to the tooth post 111. For the sake of simplicity of illustration, some structural schematics are deleted in FIG. 7, and specific references may be made to other schematic diagrams, where Q4 is an enlarged view of the area of Q3; however, in terms of specific appearance dimension parameters, the first tooth tip length L corresponding to the first stator tooth 701 L may be L1, and the first tooth tip length L corresponding to the second stator tooth 702 L may be L2, and L1 > L2 or L1 < L2; the second tooth tip length L corresponding to the first stator tooth 701 and the second stator tooth 702 R may both be L3.

[0069] In some other possible implementation manners, the stator tooth group 61 may include three or more stator teeth 11. Obviously, this situation is the same as the above embodiment. The first tooth tip lengths L corresponding to the multiple stator teeth 11 in the stator tooth group 61 L may be all different from each other, and the second tooth tip lengths L corresponding to the multiple stator teeth 11R They can all be the same.

[0070] Through the above settings, an arrangement of the motor stator teeth 11 can be provided. Since the motor stator includes the stator teeth 11 in the embodiments of FIGS. 1 to 5 above, the noise level of the motor can also be reduced.

[0071] FIG. 8 is a schematic diagram of another motor stator structure provided by an embodiment of the present disclosure; in some embodiments, the stator tooth group 61 includes more than two stator teeth 11, and for each stator tooth group 61, the first tooth tip length L corresponding to each stator tooth 11 in the stator tooth group 61 L is different, and the second tooth tip length L corresponding to each stator tooth 11 in the stator tooth group 61 R is different.

[0072] Exemplarily, still taking the stator tooth group 61 including two stator teeth 11 as an example in FIG. 8, the motor stator can be formed by repeatedly arranging the stator tooth group 61 composed of two stator teeth 11. Each stator tooth group 61 can include a No. 3 stator tooth 801 and a No. 4 stator tooth 802. Obviously, both the No. 3 stator tooth 801 and the No. 4 stator tooth 802 are the stator teeth 11 in any one of FIGS. 1 to 5 above, that is, the first tooth tip 112 and the second tooth tip 113 are arranged asymmetrically with respect to the tooth post 111; for the sake of simplicity of illustration, some structural schematics are deleted in FIG. 8, and specific references can be made to other schematic diagrams, where Q6 is an enlarged view of the area of Q5; however, in specific appearance dimension parameters, the first tooth tip length L corresponding to the No. 3 stator tooth 801 L can be L4, the first tooth tip length L corresponding to the No. 4 stator tooth 802 L can be L5, and L4 > L5 or L4 < L5. The second tooth tip length L corresponding to the No. 3 stator tooth 801 R can be L6, the second tooth tip length L corresponding to the No. 4 stator tooth 802 R can be L7, and L6 < L7 or L6 > L7; in some possible implementation manners, it can be L4 < L6 < L5 < L7.

[0073] Through the above settings, another arrangement of the motor stator teeth 11 can be provided. Since the motor stator includes the stator teeth 11 in the embodiments of FIGS. 1 to 5 above, the noise level of the motor can also be reduced.

[0074] FIG. 9 is a schematic diagram of another motor stator structure provided by an embodiment of the present disclosure; in some embodiments, the stator tooth group 61 includes one stator tooth 11, and the first tooth tip length L corresponding to the stator teeth 11 in any two stator tooth groups 61 L is different, and the second tooth tip length L corresponding to any two stator teeth 11 R is the same.

[0075] For example, FIG9 takes the stator tooth group 61 including a stator tooth 11 as an example. In some possible implementations, the motor stator can be composed of a stator tooth group 61 consisting of a stator tooth 11, and each group of stator tooth groups 61 can include a stator tooth No. 5 901. Obviously, the stator tooth No. 5 901 is the stator tooth 11 of any one of FIG1 to FIG5 above, that is, the first tooth tip 112 and the second tooth tip 113 are asymmetrically arranged relative to the tooth column 111. For the sake of simplicity, the schematic diagram of some structures is deleted in FIG9. For details, please refer to other schematic diagrams, where Q8 is an enlarged view of the area of ​​Q7. However, in terms of specific appearance size parameters, the first tooth tip length L corresponding to each stator tooth No. 5 901 is L They are all different. For example, the first tooth tip length L corresponding to a stator tooth No. 5 901 is L It can be L8, then the first tooth tip length L corresponding to the fifth stator tooth 901 is L Then it must not be L8, but can be L9. The second tooth tip length L corresponding to each fifth stator tooth 901 is R Both can be L 10 .

[0076] Through the above arrangement, another arrangement of the motor stator teeth 11 can be provided. Since the motor stator includes the stator teeth 11 in the embodiments of Figures 1 to 5 above, the noise level of the motor can also be reduced.

[0077] FIG10 is a schematic diagram of another motor stator structure provided by an embodiment of the present disclosure; in some embodiments, the stator tooth set 61 includes a stator tooth 11, and the first tooth tip length L corresponding to the stator teeth 11 in any two stator tooth sets 61 is L Different, the second tooth tip length L corresponding to any two stator teeth 11 R different.

[0078] For example, FIG10 still takes the stator tooth group 61 including one stator tooth 11 as an example. In some possible implementations, the motor stator can be composed of a stator tooth group 61 consisting of one stator tooth 11, which is repeatedly arranged. Each group of stator tooth groups 61 can include a sixth stator tooth 1001. Obviously, the sixth stator tooth 1001 is the stator tooth 11 of any one of FIG1 to FIG5 above, that is, the first tooth tip 112 and the second tooth tip 113 are arranged asymmetrically. For the sake of simplicity, the schematic diagram of some structures is deleted in FIG9. For details, please refer to other schematic diagrams, where Q 10 This is an enlarged view of the Q9 area; however, in terms of specific appearance size parameters, the first tooth tip length L corresponding to each sixth stator tooth 1001 L They are all different. For example, the first tooth tip length L corresponding to a certain stator tooth No. 6 1001 is L It can be L 11, then the first tooth tip length L corresponding to the other stator tooth No. 5 901 is L Then it must not be L 11 , and can be L 12 , the second tooth tip length L corresponding to a certain stator tooth No. 5 901 R It's L 13 , then the second tooth tip length L corresponding to the other stator tooth No. 5 901 is R Then it must not be L 13 , and can be L 14 In some embodiments, L1≠L2≠L3≠L4≠L5≠L6≠L7≠L8≠L9≠L 10 ≠L 11 ≠L 12 ≠L 13 ≠L 14 .

[0079] Through the above arrangement, another arrangement of the motor stator teeth 11 can be provided. Since the motor stator includes the stator teeth 11 in the embodiments of Figures 1 to 5 above, the noise level of the motor can also be reduced.

[0080] FIG11 is a schematic diagram of another stator tooth structure provided by an embodiment of the present disclosure; wherein, Q 12 Q 11 In some embodiments, the appearance dimension parameter also includes the tooth tip height; the first tooth tip height H corresponding to the first tooth tip 112 L Greater than or less than the second tooth tip height H corresponding to the second tooth tip 113 R ; Among them, the first tooth tip height H L is the tooth tip height value of the end of the first tooth tip 112, and the second tooth tip height H R is the tooth tip height value of the end of the second tooth tip 113, the first tooth tip height H L The corresponding direction is perpendicular to the first tooth tip length L L The corresponding direction is perpendicular to the axial direction of the motor rotor, and the second tooth tip height H R The corresponding direction is perpendicular to the second tooth tip length L R The direction corresponds to and is perpendicular to the axial direction of the motor rotor.

[0081] For example, the embodiment of the present disclosure uses an 8-pole 48-slot motor electromagnetic design as an example to determine the influence of tooth tip height on torque fluctuation and radial electromagnetic force through electromagnetic simulation optimization. The embodiment of the present disclosure converts the tooth tip height into a second per-unit value for description, where the second per-unit value can be the first tooth tip height H corresponding to the first tooth tip 112. L The ratio of the height R6 of the first tooth tip corresponding to the first tooth tip 112 can also be the height H of the first tooth tip corresponding to the second tooth tip 113.L The ratio between the tooth tip head end height R7 corresponding to the second tooth tip 113, the head end height is the height value of the head end of the tooth tip, and the head end height direction is parallel to the tooth tip height, as shown in Figure 12; that is, the larger the second per-unit value, the larger the tooth tip height, and there is a unique and definite conversion relationship between the two that is a directly proportional function.

[0082] The embodiment of the present disclosure attempts to change only the first tooth tip height H corresponding to the first tooth tip 112 L , the second tooth tip height H corresponding to the second tooth tip 113 R Taking the unchanged as an example, the electromagnetic simulation optimization is carried out, and the first tooth tip height H is actually formed. L Greater or less than the second tooth tip height H R ; Figure 12 is a schematic diagram of the change of torque fluctuation with the second per-unit value. The horizontal axis in Figure 12 represents the second per-unit value, and the vertical axis represents the torque fluctuation. The solid line curve is the 48th order torque fluctuation, and the dotted line curve is the 24th order torque fluctuation; Figure 13 is a schematic diagram of the change of radial electromagnetic force with the second per-unit value. The horizontal axis in Figure 13 represents the second per-unit value, and the vertical axis represents the torque fluctuation. The realization curve is the 48th order radial electromagnetic force, and the dotted line curve is the 24th order radial electromagnetic force; Figure 14 is a schematic diagram of the change of average torque and torque fluctuation peak-to-peak value with the second per-unit value. The horizontal axis in Figure 14 represents the second per-unit value, and the vertical axis represents the average torque or torque fluctuation peak-to-peak value. The solid line curve is the average torque, and the dotted line curve is the torque fluctuation peak-to-peak value. Based on the curve diagrams of Figures 12 to 14 above, a specific value of the second per-unit value in a possible embodiment can be selected. The principle of selecting the second per-unit value is combined with actual conditions. For a possible embodiment, the motor is in the speed range of 7000rpm to 9000rpm under the WOT condition, and the 48th order radial electromagnetic force and torque fluctuation are mainly optimized. When the first per-unit value is selected in the range of 0.34 to 0.39, the 48th order torque fluctuation and radial electromagnetic force are greatly improved, and the total torque fluctuation is significantly reduced, and the average torque is also greatly improved; that is, the radial electromagnetic force and torque fluctuation should be as small as possible, the peak-to-peak value of the torque fluctuation should be as small as possible, and the average torque needs to be as large as possible.

[0083] Through the above electromagnetic simulation optimization, it can be concluded that the first tooth tip 112 and the second tooth tip 113 are asymmetrical, and the height H of the first tooth tip is L Greater or less than the second tooth tip height H R It can effectively reduce radial electromagnetic force and torque fluctuations, thereby effectively reducing the noise generated by the motor.

[0084] Figure 15 is a schematic diagram of another motor stator structure provided in an embodiment of the present disclosure; in some embodiments, the motor stator is composed of multiple groups of stator teeth 1501 repeatedly arranged in the circumferential direction; wherein each group of stator teeth 1501 includes at least one stator tooth 11.

[0085] Exemplarily, similar to the embodiment corresponding to FIG. 6, the embodiments in FIG. 1 and FIGS. 11 to 14 above are for exemplary illustration of a single motor stator tooth 11. However, a motor stator may be composed of multiple stator teeth 11. At least one stator tooth 11 may form a stator tooth group 1501, and the stator tooth groups 1501 are repeatedly arranged in the circumferential direction of the motor rotor to form the overall structure of the motor stator. Obviously, each stator tooth 11 in each stator tooth group 1501 in the motor stator can be the stator tooth 11 in the embodiments in FIG. 1 and FIGS. 11 to 14 above, so as to achieve the purpose of reducing the overall noise level of the motor. It should be noted that since only one stator tooth 11 is used to form the stator tooth group 1501 in FIG. 15, the stator tooth group 1501 and the stator tooth 11 are framed by the same dashed line box in the schematic diagram corresponding to FIG. 15. However, obviously, the two are not the same structure, but the stator tooth group 1501 includes the stator tooth 11.

[0086] FIG. 16 is a schematic diagram of another motor stator structure provided by an embodiment of the present disclosure. In some embodiments, the stator tooth group 1501 includes more than two stator teeth 11, and for each stator tooth group 1501, the first tooth tip height H corresponding to each stator tooth 11 in the stator tooth group 1501 L is different, and the second tooth tip height H corresponding to each stator tooth 11 in the stator tooth group 1501 R is the same.

[0087] Exemplarily, FIG. 16 takes each stator tooth group 1501 including two stator teeth 11 as an example, where Q 14 is the enlarged view of the area of Q 13 . The motor stator may be formed by repeatedly arranging stator tooth groups 1501 composed of two stator teeth 11. Each stator tooth group 1501 may include a seventh stator tooth 1601 and an eighth stator tooth 1602. Obviously, both the seventh stator tooth 1601 and the seventh stator tooth 1601 are the stator teeth 11 in any one of FIG. 1 and FIGS. 11 to 14 above, that is, the first tooth tip 112 and the second tooth tip 113 are asymmetrically arranged with respect to the tooth post 111. However, in terms of specific appearance dimension parameters, the first tooth tip height H corresponding to the seventh stator tooth 1601 L may be H1, the first tooth tip height H corresponding to the eighth stator tooth 1602 L may be H2, and H1 > H2 or H1 < H2; the second tooth tip height H corresponding to the seventh stator tooth 1601 and the eighth stator tooth 1602 R may both be H3.

[0088] In some other possible implementation manners, the stator tooth group 1501 may include three or more stator teeth 11. Obviously, the same principle applies to the above embodiments. The first tooth tip heights H corresponding to the multiple stator teeth 11 in the stator tooth group 1501 L may each be different, and the second tooth tip heights H corresponding to the multiple stator teeth 11 R may be the same.

[0089] Through the above settings, an arrangement manner of the motor stator teeth 11 can be provided. Since the motor stator includes the stator teeth 11 in the above FIGS. 1 and 11 to 14 embodiments, the noise level of the motor can also be reduced.

[0090] FIG. 17 is a schematic diagram of another motor stator structure provided by an embodiment of the present disclosure; in some embodiments, the stator tooth group 1501 includes two or more stator teeth 11, and for each stator tooth group 1501, the first tooth tip height H corresponding to each stator tooth 11 in the stator tooth group 1501 L is different, and the second tooth tip height H corresponding to each stator tooth 11 in the stator tooth group 1501 R is different.

[0091] Exemplarily, still taking the stator tooth group 1501 including two stator teeth 11 as an example in FIG. 17, where Q 16 is an enlarged view of the area of Q 15 ; the motor stator may be formed by repeating the arrangement of the stator tooth group 1501 composed of two stator teeth 11. Each stator tooth group 1501 may include the ninth stator tooth 1701 and the tenth stator tooth 1702. Obviously, both the ninth stator tooth 1701 and the tenth stator tooth 1702 are the stator teeth 11 in any one of the above FIGS. 1 and 11 to 14, that is, the first tooth tip 112 and the second tooth tip 113 are asymmetrically arranged with respect to the tooth column 111; however, in specific appearance dimension parameters, the first tooth tip height H corresponding to the ninth stator tooth 1701 L may be H4, the first tooth tip height H corresponding to the tenth stator tooth 1702 L may be H5, and H4 > H5 or H4 < H5. The second tooth tip height H corresponding to the ninth stator tooth 1701 R may be H6, the second tooth tip height H corresponding to the tenth stator tooth 1702 R may be H7, and H6 < H7 or H6 > H7; in some possible implementation manners, it may be H4 < H6 < H5 < H7.

[0092] Through the above settings, another arrangement manner of the motor stator teeth 11 can be provided. Since the motor stator includes the stator teeth 11 in the above FIGS. 1 and 11 to 14 embodiments, the noise level of the motor can also be reduced.

[0093] FIG18 is a schematic diagram of another motor stator structure provided by an embodiment of the present disclosure; in some embodiments, the stator tooth set 1501 includes a stator tooth 11, and the first tooth tip height H corresponding to the stator teeth 11 in any two stator tooth sets 1501 is L Different, the second tooth tip height H corresponding to any two stator teeth 11 R same.

[0094] For example, in FIG18 , the stator tooth group 1501 includes a stator tooth 11 as an example, wherein Q 18 Q 17 ; In some possible implementations, the motor stator can be composed of a stator tooth group 1501 consisting of a stator tooth 11, each stator tooth group 1501 can include an eleventh stator tooth 1801. Obviously, the eleventh stator tooth 1801 is the stator tooth 11 of any one of Figures 1 and 11 to 14 above, that is, the first tooth tip 112 and the second tooth tip 113 are asymmetrically arranged relative to the tooth column 111; However, in terms of specific appearance size parameters, the first tooth tip height H corresponding to each eleventh stator tooth 1801 is L They are all different. For example, the first tooth tip height H corresponding to a stator tooth 1801 is L It can be H8, then the first tooth tip height H corresponding to the other stator tooth No. 11 1801 is L Then it must not be H8, but can be H9. The second tooth tip height H corresponding to each stator tooth No. 11 1801 is R Both can be H 10 .

[0095] Through the above arrangement, another arrangement of the motor stator teeth 11 can be provided. Since the motor stator includes the stator teeth 11 in the embodiments of FIG. 1 and FIG. 11 to FIG. 14 , the noise level of the motor can also be reduced.

[0096] FIG19 is a schematic diagram of another motor stator structure provided by an embodiment of the present disclosure; in some embodiments, the stator tooth set 1501 includes a stator tooth 11, and the first tooth tip height H corresponding to the stator teeth 11 in any two stator tooth sets 1501 is L Different, the second tooth tip height H corresponding to any two stator teeth 11 R different.

[0097] For example, FIG19 still takes the stator tooth group 1501 including one stator tooth 11 as an example, wherein Q 20 Q 19; In some possible implementations, the motor stator can be composed of a stator tooth group 1501 consisting of a stator tooth 11, each stator tooth group 1501 can include a twelfth stator tooth 1901. Obviously, the twelfth stator tooth 1901 is the stator tooth 11 of any one of Figures 1 and 11 to 14 above, that is, the first tooth tip 112 and the second tooth tip 113 are asymmetrically arranged; However, in terms of specific appearance size parameters, the first tooth tip height H corresponding to each twelfth stator tooth 1901 is L They are all different. For example, the first tooth tip height H corresponding to a certain stator tooth No. 1901 is L It can be H 11 , then the first tooth tip height H corresponding to the other stator tooth No. 12 1901 is L Then it must not be H 11 , and can be H 12 , the second tooth tip height H corresponding to a certain stator tooth No. 12 1901 R It's L 13 , then the second tooth tip height H corresponding to the other stator tooth No. 12 1901 is R Then it must not be H 13 , and can be H 14 H1≠H2≠H3≠H4≠H5≠H6≠H7≠H8≠H9≠H 10 ≠H 11 ≠H 12 ≠H 13 ≠H 14 .

[0098] Through the above arrangement, another arrangement of the motor stator teeth 11 can be provided. Since the motor stator includes the stator teeth 11 in the embodiments of Figures 1 to 5 above, the noise level of the motor can also be reduced.

[0099] In the embodiments corresponding to Figures 2 to 10 above, only the tooth tip length is used as a variable for illustrative purposes. This means that the tooth tip height in the embodiments corresponding to Figures 2 to 10 is considered constant or not explicitly defined. Similarly, in the embodiments corresponding to Figures 11 to 19, only the tooth tip height is used as a variable for illustrative purposes. This means that the tooth tip length in the embodiments corresponding to Figures 11 to 19 is considered constant or not explicitly defined. Clearly, both tooth tip length and tooth tip height are variables that affect torque ripple and radial electromagnetic force, meaning that both tooth tip length and tooth tip height can affect the noise level of the motor.

[0100] Therefore, in some other embodiments, the embodiments corresponding to Figures 2 to 10 and the embodiments corresponding to Figures 11 to 19 can be freely combined to form new embodiments. For example, by combining the embodiments corresponding to Figures 9 and 18, the new motor stator structure is that the motor stator is formed by a third group of stator teeth 11 repeatedly arranged along the circumferential direction of the motor rotor; each group of third stator teeth 11 includes a stator tooth 11, and the first tooth tip lengths LL corresponding to the stator teeth 11 in any two third groups of stator teeth 11 are different, the second tooth tip lengths LR corresponding to the stator teeth 11 in any two third groups of stator teeth 11 are the same, the first tooth tip heights HL corresponding to the stator teeth 11 in any two third groups of stator teeth 11 are different, and the second tooth tip heights HR corresponding to the stator teeth 11 in any two third groups of stator teeth 11 are the same.

[0101] Furthermore, since the stator teeth 11 in the third group of stator teeth 11 are arranged asymmetrically, the generation of motor noise can also be reduced.

[0102] After testing, the present disclosure summarizes some data results. Table 1 below is a table of electromagnetic simulation comparison results:

[0103] Table 1 - Electromagnetic simulation comparison results

[0104] In the table above, the simple structure of the stator tooth 11 in the first row - the symmetrical tooth tip structure, that is, NO.1 represents the first tooth tip 112 and the second tooth tip 113 of the stator tooth 11 in the prior art solution are symmetrically arranged relative to the tooth column 111. 15 represents the first tooth tip height H corresponding to the first tooth tip 112 L , H 16 The second tooth tip height H corresponding to the second tooth tip 113 is represented by R , W1 represents the first per-unit value corresponding to the first tooth tip 112, which can actually be considered as the first tooth tip length L L , W2 represents the first per-unit value corresponding to the second tooth tip 113, which can actually be considered as the second tooth tip length L R , it is obvious that the first tooth tip height H L Equal to the second tooth tip height H R , length of the first tooth tip L L Equal to the second tooth tip length L R The simple structure in the first row - asymmetric tooth tip structure, that is, NO.2 represents the change in the first tooth tip length L of the stator tooth 11 in this solution L Or the second tooth tip length L R , so that the first tooth tip 112 and the second tooth tip 113 of the stator tooth 11 form an asymmetric structure. The H in the NO.2 column 17represents the first tooth tip height H corresponding to the first tooth tip 112 L , H 18 The second tooth tip height H corresponding to the second tooth tip 113 is represented by R , W3 represents the first per-unit value corresponding to the first tooth tip 112, which can actually be considered as the first tooth tip length L L , W4 represents the first per-unit value corresponding to the second tooth tip 113, which can actually be considered as the second tooth tip length L R , it is obvious that the first tooth tip height H L Equal to the second tooth tip height H R , length of the first tooth tip L L Greater than the second tooth tip length L R The complex structure in the first row - the asymmetric tooth tip structure, that is, NO.3 represents the solution in which two stator teeth 11 are formed into a fourth stator tooth group 11. The motor stator is formed by repeatedly arranging the fourth stator tooth group 11. The stator tooth group 11 may include stator tooth No. 13 and stator tooth No. 14. The H in the NO.3 column 19 The first tooth tip height H corresponding to the first tooth tip 112 in the thirteenth stator tooth is represented by L , H 20 The second tooth tip height H corresponding to the second tooth tip 113 in the thirteenth stator tooth is shown as R , H 21 The first tooth tip height H corresponding to the first tooth tip 112 in the fourteenth tooth tip is shown as L , H 22 The second tooth tip height H corresponding to the second tooth tip 113 in the fourteenth tooth tip is shown as R , W5 represents the first per-unit value corresponding to the first tooth tip 112 of the thirteenth stator tooth, W2 represents the first per-unit value corresponding to the second tooth tip 113 of the thirteenth stator tooth, W3 represents the first per-unit value corresponding to the first tooth tip 112 of the fourteenth stator tooth, and W4 represents the first per-unit value corresponding to the second tooth tip 113 of the fourteenth stator tooth. Obviously, in NO.3, the height H of the first tooth tip of the thirteenth stator tooth in each group is L and the second tooth tip height H R The height H of the first tooth tip of stator tooth No. 14 is not equal. L and the second tooth tip height H R However, the height H of the first tooth tip in stator tooth No. 13 is L Equal to the height H of the first tooth tip in stator tooth number 14 L , the second tooth tip height H of stator tooth No. 13 R Equal to the second tooth tip height H in stator tooth number 14 R , the first tooth tip length L corresponding to stator tooth No. 13 and stator tooth No. 14 L and the second tooth tip length L RThey are not equal.

[0105] Continuing to refer to Table 1 above, the average torque can represent the ability of the motor to output power, that is, the greater the average torque, the better the motor performance. However, in some scenarios, the average torque can be considered to have no direct relationship with the main problem to be solved by the embodiment of the present disclosure, that is, reducing the noise of the motor, but is an additional technical effect; the peak-to-peak value of torque fluctuation, the 24th order torque fluctuation peak value, the 24th order radial electromagnetic force-first tooth tip 112 concentrated force, the 24th order radial electromagnetic force-second tooth tip 113 concentrated force, the 48th order torque fluctuation peak value, the 48th order radial electromagnetic force-first tooth tip 112 concentrated force, and the 48th order radial electromagnetic force-second tooth tip 113 concentrated force are all parameter values. The lower the value, the lower the noise of the motor. It can be clearly seen from the above table that the asymmetric tooth tip set according to the embodiment of the present disclosure can effectively reduce the noise level of the motor, and as the complexity of the stator teeth 11 in the motor stator increases, the noise is lower.

[0106] The present disclosure further provides a motor, comprising a motor stator as in any of the above-mentioned motor stator embodiments. Since the motor provided in the embodiments of the present disclosure comprises the motor stator in the above-mentioned embodiments, the same technical effects as those in the above-mentioned motor stator embodiments can be achieved, and thus will not be further described here.

[0107] An embodiment of the present disclosure further provides a vehicle, which includes a motor as described in the above motor embodiment.

[0108] Since the vehicle provided by the embodiment of the present disclosure includes the motor in the above embodiment, it can also achieve the same technical effect as the above motor embodiment, that is, it actually achieves the same technical effect as the above motor stator embodiment, which will not be repeated here.

[0109] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprises" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a..." do not exclude the presence of other identical elements in the process, method, article or device that includes the elements.

[0110] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

Claims

1. A motor stator, comprising a plurality of stator teeth: The stator tooth comprises a tooth column, a first tooth tip and a second tooth tip; the first tooth tip is arranged at a first end of the tooth column, the second tooth tip is arranged at a second end of the tooth column, and the first end is an opposite end of the second end, and the direction of a line connecting the shortest distance between the first end and the second end is tangent to the circumferential direction of the motor rotor; The first tooth tip and the second tooth tip have different appearance dimension parameters, the first tooth tip and the second tooth tip are arranged asymmetrically relative to the tooth column, the appearance dimension parameters include tooth tip length and tooth tip height, and among the plurality of stator teeth, at least some of the stator teeth have different first tooth tip lengths or first tooth tip heights; in, The first tooth tip length is the minimum distance between the end of the first tooth tip and the tooth column, the first tooth tip height is the tooth tip height value of the end of the first tooth tip, the head end of the first tooth tip is connected to the tooth column, and the end is the opposite end of the head end.

2. The motor stator according to claim 1, wherein: The first tooth tip length corresponding to the first tooth tip is greater than or less than the second tooth tip length corresponding to the second tooth tip; wherein the second tooth tip length is the minimum distance between the end of the second tooth tip and the tooth column; the head end of the second tooth tip is connected to the tooth column, and the end of the second tooth tip is the opposite end of the head end of the second tooth tip.

3. The motor stator according to claim 1 or 2, wherein: The first tooth tip height corresponding to the first tooth tip is greater than or less than the second tooth tip height corresponding to the second tooth tip; wherein the second tooth tip height is the tooth tip height value at the end of the second tooth tip, the direction corresponding to the first tooth tip height is perpendicular to the direction corresponding to the first tooth tip length and perpendicular to the axial direction of the motor rotor, and the direction corresponding to the second tooth tip height is perpendicular to the direction corresponding to the second tooth tip length and perpendicular to the axial direction of the motor rotor.

4. The motor stator according to claim 1, wherein: The motor stator is formed by a plurality of groups of stator teeth repeatedly arranged along the circumferential direction; wherein each group of the stator teeth includes at least one stator tooth.

5. The motor stator according to claim 4, wherein: The stator tooth set includes one stator tooth, and the lengths or heights of the first tooth tips of any two stator teeth in the stator tooth set are different; Alternatively, the stator teeth group includes at least two stator teeth, and the lengths or heights of the first tooth tips of the stator teeth in each stator teeth group are different.

6. The motor stator according to claim 5, wherein: The stator tooth group includes more than two stator teeth, and for each group of the stator teeth group, the first tooth tip length corresponding to each stator tooth in the stator tooth group is different, and the second tooth tip length corresponding to each stator tooth in the stator tooth group is the same.

7. The motor stator according to claim 5, wherein: The stator tooth group includes more than two stator teeth, and for each group of the stator teeth group, the first tooth tip length corresponding to each stator tooth in the stator tooth group is different, and the second tooth tip length corresponding to each stator tooth in the stator tooth group is different.

8. The motor stator according to claim 5, wherein: The stator tooth set includes one stator tooth, and first tooth tip lengths corresponding to the stator teeth in any two of the stator tooth sets are different, and second tooth tip lengths corresponding to the stator teeth in any two of the stator tooth sets are the same.

9. The motor stator according to claim 5, wherein: The stator tooth set includes one stator tooth, and first tooth tip lengths corresponding to any two stator teeth in the stator tooth set are different, and second tooth tip lengths corresponding to any two stator teeth in the stator tooth set are different.

10. The motor stator according to claim 1, wherein: There is a gap between any two adjacent stator teeth; The first tooth tip length and / or the second tooth tip length is smaller than the third length; wherein the third length is half of the tooth tip length of the gap between two adjacent stator teeth.

11. The motor stator according to claim 5, wherein: The stator tooth group includes more than two stator teeth, and for each group of the stator teeth group, the first tooth tip height corresponding to each stator tooth in the stator tooth group is different, and the second tooth tip height corresponding to each stator tooth in the stator tooth group is the same.

12. The motor stator according to claim 5, wherein: The stator tooth group includes more than two stator teeth, and for each group of the stator teeth group, the first tooth tip height corresponding to each stator tooth in the stator tooth group is different, and the second tooth tip height corresponding to each stator tooth in the stator tooth group is different.

13. The motor stator according to claim 5, wherein: The stator tooth set includes one stator tooth, and the first tooth tip heights corresponding to the stator teeth in any two of the stator tooth sets are different, and the second tooth tip heights corresponding to the stator teeth in any two of the stator tooth sets are the same.

14. The motor stator according to claim 5, wherein: The stator tooth set includes one stator tooth, and the first tooth tip heights corresponding to the stator teeth in any two of the stator tooth sets are different, and the second tooth tip heights corresponding to the stator teeth in any two of the stator tooth sets are different.

15. An electric motor, comprising the electric motor stator according to any one of claims 1 to 14.

16. A vehicle comprising the electric machine according to claim 15.

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