Stator tooth, motor stator, motor and vehicle

Abstract

The invention provides a stator tooth, a motor stator, a motor and a vehicle. The stator tooth comprises a tooth column, a first tooth tip and a second tooth tip, the first tooth tip is arranged at the first end of the tooth column, the second tooth tip is arranged at the second end of the tooth column, the first end is opposite to the second end, and the connecting line direction of the shortest distance between the first end and the second end is tangent to the circumferential direction of the motor rotor; the external dimension parameters of the first tooth tip and the second tooth tip are different, so that the first tooth tip and the second tooth tip are asymmetrically arranged relative to the tooth column. Through the arrangement, the motor stator teeth form an asymmetric structure, and compared with a traditional motor stator with a symmetrically arranged stator tooth structure, the scheme can effectively reduce the noise level of the motor.

Description

Technical Field

[0001] The present disclosure relates to the field of vehicle technology, and in particular to a stator tooth, a motor stator, a motor and a vehicle. Background Art

[0002] With the rapid development of the electric vehicle market and technology, electric drive systems have gradually replaced engine systems and have been widely used. As the power source for driving vehicles, the technological development of motors is not only reflected in indicators such as power density and efficiency, but also has increasingly higher requirements in terms of comfort.

[0003] In the existing technical solutions, the stator tooth tips of the motor generally adopt a simple symmetrical structure, that is, the two tooth tips of the stator teeth of the motor are symmetrical to each other, which easily generates resonance when the motor is working, and then generates relatively large noise. Summary of the invention

[0004] In order to solve the above technical problems or at least partially solve the above technical problems, the present disclosure provides a stator tooth, a motor stator, a motor and a vehicle.

[0005] In a first aspect, the present disclosure provides a stator tooth, the stator tooth comprising:

[0006] A tooth column, a first tooth tip, and a second tooth tip;

[0007] The first tooth tip is arranged at the first end of the tooth column, the second tooth tip is arranged at the second end of the tooth column, the first end is an opposite end of 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;

[0008] The first tooth tip and the second tooth tip have different appearance size parameters, so that the first tooth tip and the second tooth tip are arranged asymmetrically relative to the tooth column.

[0009] Optionally, the appearance dimension parameter includes tooth tip length;

[0010] 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 first tooth tip length is the minimum distance value between the end of the first tooth tip and the tooth column, and the second tooth tip length is the minimum distance value between the end of the second tooth tip and the tooth column; the head ends of the first tooth tip and the second tooth tip are connected to the tooth column, and the end is the opposite end of the head end.

[0011] Optionally, the appearance dimension parameter also includes tooth tip height;

[0012] 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;

[0013] Among them, the first tooth tip height is the tooth tip height value at the end of the first tooth tip, 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.

[0014] In a second aspect, the present disclosure further provides a motor stator, wherein the motor stator is formed by a plurality of groups of stator teeth repeatedly arranged along the circumferential direction;

[0015] Wherein, each group of stator teeth includes at least one stator tooth as described in any one of the first aspects.

[0016] Optionally, 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.

[0017] Optionally, 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.

[0018] Optionally, the stator tooth group includes one stator tooth, and the first tooth tip lengths corresponding to the stator teeth in any two of the stator tooth groups are different, and the second tooth tip lengths corresponding to the stator teeth in any two of the stator tooth groups are the same.

[0019] Optionally, the stator tooth group includes one stator tooth, and the first tooth tip lengths corresponding to the stator teeth in any two of the stator tooth groups are different, and the second tooth tip lengths corresponding to the stator teeth in any two of the stator tooth groups are different.

[0020] Optionally, there is a gap between any two adjacent stator teeth;

[0021] 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.

[0022] Optionally, the motor stator is formed by a plurality of groups of stator teeth repeatedly arranged along the circumferential direction;

[0023] Wherein, each group of the stator teeth includes at least one stator tooth.

[0024] Optionally, 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.

[0025] Optionally, 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.

[0026] Optionally, the stator tooth group includes one stator tooth, and the first tooth tip heights corresponding to the stator teeth in any two of the stator tooth groups are different, and the second tooth tip heights corresponding to the stator teeth in any two of the stator tooth groups are the same.

[0027] Optionally, the stator tooth group includes one stator tooth, and the first tooth tip heights corresponding to the stator teeth in any two of the stator tooth groups are different, and the second tooth tip heights corresponding to the stator teeth in any two of the stator tooth groups are different.

[0028] In a third aspect, the present disclosure further provides a motor, comprising the stator teeth as described in any one of the first aspect, or comprising the motor stator as described in any one of the second aspect.

[0029] In a fourth aspect, the present disclosure further provides a vehicle, comprising the motor as described in the third aspect.

[0030] The present disclosure provides a stator tooth, a motor stator, a motor and a vehicle, wherein the stator tooth comprises: a tooth column, a first tooth tip and a second tooth tip; the first tooth tip is arranged at the first end of the tooth column, the second tooth tip is arranged at the second end of the tooth column, and the first end is the opposite end of 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 and the second tooth tip have different appearance size parameters, and the first tooth tip and the second tooth tip form an asymmetric arrangement relative to the tooth column. With such an arrangement, the stator teeth of the motor can form an asymmetric structure. Compared with the motor stator with a traditional symmetrically arranged stator tooth structure, the present solution can reduce the torque fluctuation and radial electromagnetic force of the noise excitation source of the motor during rotation. Since the torque fluctuation and radial electromagnetic force are directly related to the noise, the lower the torque fluctuation and radial electromagnetic force, the lower the noise peak amplitude, so the present solution can reduce the noise level of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic diagram of a stator tooth structure provided in an embodiment of the present disclosure;

[0032] Figure 2 A schematic diagram of another stator tooth structure provided in an embodiment of the present disclosure;

[0033] Figure 3 It is a schematic diagram of the change of torque fluctuation with the first per unit value;

[0034] Figure 4 It is a schematic diagram of the change of radial electromagnetic force with the first per-unit value;

[0035] Figure 5 It is a schematic diagram of the change of average torque and torque fluctuation peak-to-peak value with the first per-unit value;

[0036] Figure 6 A schematic diagram of a motor stator structure provided in an embodiment of the present disclosure;

[0037] Figure 7 A schematic diagram of another motor stator structure provided in an embodiment of the present disclosure;

[0038] Figure 8 A schematic diagram of another motor stator structure provided in an embodiment of the present disclosure;

[0039] Fig. 9 A schematic diagram of another motor stator structure provided in an embodiment of the present disclosure;

[0040] Fig.10 A schematic diagram of another motor stator structure provided in an embodiment of the present disclosure;

[0041] Fig.11 A schematic diagram of another stator tooth structure provided in an embodiment of the present disclosure;

[0042] Fig.12 It is a schematic diagram of the change of torque fluctuation with the second per unit value;

[0043] Fig.13 It is a schematic diagram of the change of radial electromagnetic force with the second per unit value;

[0044] Fig.14 It is a schematic diagram of the change of average torque and torque fluctuation peak-to-peak value with the second per unit value;

[0045] Fig.15 A schematic diagram of another motor stator structure provided in an embodiment of the present disclosure;

[0046] Fig.16 A schematic diagram of another motor stator structure provided in an embodiment of the present disclosure;

[0047] Fig.17 A schematic diagram of another motor stator structure provided in an embodiment of the present disclosure;

[0048] Fig.18A schematic diagram of another motor stator structure provided in an embodiment of the present disclosure;

[0049] Fig.19 A schematic diagram of another motor stator structure provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0050] 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 in the embodiments can be combined with each other without conflict.

[0051] 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.

[0052] The following is an exemplary description of a stator tooth, a motor stator, a motor and a vehicle provided in an embodiment of the present disclosure in conjunction with the accompanying drawings.

[0053] Figure 1 A schematic diagram of a stator tooth structure provided for an embodiment of the present disclosure; the stator tooth 11 comprises: 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, the second tooth tip 113 is arranged at the second end of the tooth column 111, and the first end is the opposite end of 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.

[0054] When the motor is running under extreme working conditions (WOT working conditions), the speed point of resonance / resonance is usually in the weak magnetic field area. This is due to the combined effect of the modal of the motor stator structure and the specific order radial force generated by the motor pole slot matching at this working point. Taking the 8-pole 48-slot design of a typical permanent magnet synchronous motor for driving as an example, in the speed range of 7000rpm to 9000rpm under the WOT working 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. That is, in fact, the core of the motor stator provided in 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 the torque fluctuation and the radial electromagnetic force and the noise, that is, the lower the torque fluctuation and the radial electromagnetic force, the lower the noise.

[0055] After research, the inventors found that the torque fluctuation and radial electromagnetic force can be reduced by setting the tooth tip of the stator tooth 11 to an asymmetric structure, thereby reducing the noise generated by the motor.

[0056] like Figure 1 As shown, Figure 1 The corresponding view is a schematic diagram along the axial direction of the motor as the viewing direction; 1 Represents a part of the circular structure of one side wall of the motor stator, which can also be equivalent to the circumferential direction of the electrode rotor. 2 The direction of the line representing the shortest distance between the first end and the second end 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. The asymmetric structure means that the appearance size parameters of the first tooth tip 112 and the appearance size parameters of the second tooth tip 113 are different, that is, the first tooth tip 112 and the second tooth tip 113 are not completely the same structure, and the first tooth tip 112 and the second tooth tip 113 cannot form symmetry with respect to the tooth column 111. In some possible embodiments, the first tooth tip 112 and the second tooth tip 113 can also be relative to R 3 It is impossible to form axisymmetry, where R 3 is the center line of the tooth column 111, and the extension line of the center line passes through the center of the electronic rotor; the appearance size parameters represent the appearance size parameters of the first tooth tip 112 and the second tooth tip 113, such as the tooth tip length, tooth tip height and even tooth tip volume, etc.; in all the above examples, the relative positions of the motor rotor and the motor stator are fixed, that is, the motor stator can be arranged in a ring shape, which has a center, and the motor rotor is arranged in the ring corresponding to the motor stator, and the motor rotor is in Figure 1 The corresponding viewing angle can also be circular, and the center of the motor stator coincides with the center of the motor rotor. By setting it in this way, the noise generated by the motor can be effectively reduced.

[0057] Figure 2 Another schematic diagram of a stator tooth structure provided in an embodiment of the present disclosure; wherein, Q 2 Q 1 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 L Greater 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 is the opposite end of the head end.

[0058] 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 the first per unit value for description, wherein the first per unit value is the first angle ɑ 1 The second angle ɑ 2 The ratio between the two, the second angle ɑ 2 is the center line R between two adjacent stator teeth 11 4 The center line R of the tooth column 111 of one of the stator teeth 11 passing through the center of the rotor 3 The angle between 1 The line R from the end of stator tooth 11 to the center of the rotor 5 and the center line R between two adjacent stator teeth 11 4 The angle between Figure 2 As shown, it should be noted that due to space limitations, R is not included in the embodiments of this disclosure. 3 , R 4 and R 5 The schematic diagram through the center of the motor rotor is fully displayed, but the first angle ɑ can still be accurately described through the above description and the schematic diagram 1 and the second angle ɑ 2 ; 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 it is, the more there is a unique and definite conversion relationship between the two that is a directly proportional function.

[0059] 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, the electromagnetic simulation optimization is carried out, and the first tooth tip length L is actually formed. L Greater or less than the second tooth tip length L R structural characteristics; Figure 3 This is a schematic diagram of the change of torque fluctuation with the first per unit value. Figure 3 The horizontal axis in represents the first 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 4 It is a schematic diagram of the change of radial electromagnetic force with the first per unit value. Figure 4 The horizontal axis in represents the first per-unit value, the vertical axis represents the torque fluctuation, the realized curve is the 48th order radial electromagnetic force, and the dotted curve is the 24th order radial electromagnetic force; Figure 5 It is a schematic diagram of the change of average torque and torque fluctuation peak-to-peak value with the first per-unit value. Figure 5The horizontal axis represents the first per-unit value, the vertical axis represents the average torque or the peak-to-peak value of the torque fluctuation, the solid line curve is the average torque, and the dotted line curve is the peak-to-peak value of the torque fluctuation. Figures 3 to 5 The curve diagram can select a specific value of the first per-unit value in a possible embodiment. The principle of selecting the first per-unit value is combined with the actual situation. 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.

[0060] 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 fluctuation, thereby effectively reducing the noise generated by the motor.

[0061] based on Figures 2 to 5 The corresponding embodiments 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 Less than the third length L 0 ; Among them, the third length L 0 It is half of the tooth tip length of the gap between two adjacent stator teeth 11 .

[0062] That is, through the above settings, the noise level of the motor can be reduced.

[0063] Figure 6 A schematic diagram of a motor stator structure is provided for an embodiment of the present disclosure; in some embodiments, the motor stator is composed of multiple groups of stator tooth groups 61 repeatedly arranged in a circumferential direction; wherein each group of stator tooth groups 61 includes at least one stator tooth 11.

[0064] For example, the above Figures 1 to 5 The embodiment in the figure is for a single motor stator tooth 11 for illustrative purposes, but the motor stator can be composed of multiple stator teeth 11, at least one stator tooth 11 can form a stator tooth group 61, and the stator tooth group 61 is repeatedly arranged along the circumferential direction of the motor rotor to form the overall structure of the motor stator. Obviously, the stator teeth 11 in each stator tooth group 61 in the motor stator can be the above-mentioned Figure 1-Figure 5The stator teeth 11 in the embodiment are used to reduce the overall noise level of the motor. Figure 6 In the example, only one stator tooth 11 is used to form the stator tooth group 61. Figure 6 In the corresponding schematic diagram, the stator tooth set 61 and the stator teeth 11 are framed by the same dotted line frame, but it is obvious that the two are not the same structure, but the stator tooth set 61 includes the stator teeth 11.

[0065] Figure 7 Another schematic diagram of a motor stator structure provided in an embodiment of the present disclosure; in some embodiments, the stator tooth group 61 includes more than two stator teeth 11, and for each group of stator tooth groups 61, the first tooth tip length L corresponding to each stator tooth 11 in the stator tooth group 61 is L Differently, the second tooth tip length L corresponding to each stator tooth 11 in the stator tooth set 61 is R same.

[0066] For example, Figure 7 Taking the example that each stator tooth group 61 includes two stator teeth 11, the motor stator can be composed of stator tooth groups 61 consisting of two stator teeth 11 arranged repeatedly, that is, Figure 7 Each stator tooth group 61 in the embodiment 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 the same as above. Figures 1 to 5 The stator teeth 11 of any one of the above, namely the first tooth tip 112 and the second tooth tip 113 are arranged asymmetrically relative to the tooth column 111; for simplicity of illustration, Figure 7 The schematic diagram of some structures has been deleted. For details, please refer to other schematic diagrams. 4 Q 3 However, in terms of specific appearance size parameters, the first tooth tip length L corresponding to the first stator tooth 701 is L It can be L 1 , the first tooth tip length L corresponding to the second stator tooth 702 L It can be L 2 , and L 1 >L 2 or L 1 <L 2 ; The second tooth tip length L corresponding to the first stator tooth 701 and the second stator tooth 702 R Both can be L 3 .

[0067] In some other possible implementations, the stator tooth set 61 may include three or more stator teeth 11. This situation is obviously the same as the above embodiment. The first tooth tip length L corresponding to the plurality of stator teeth 11 in the stator tooth set 61 is LThe second tooth tip lengths L corresponding to the plurality of stator teeth 11 may be different. R Can be the same.

[0068] Through the above configuration, a motor stator tooth 11 arrangement method can be provided. Since the motor stator includes the above Figures 1 to 5 The stator teeth 11 in the embodiment can therefore also reduce the noise level of the motor.

[0069] Figure 8 Another schematic diagram of a motor stator structure provided in an embodiment of the present disclosure; in some embodiments, the stator tooth group 61 includes more than two stator teeth 11, and for each group of stator tooth groups 61, the first tooth tip length L corresponding to each stator tooth 11 in the stator tooth group 61 is L Differently, the second tooth tip length L corresponding to each stator tooth 11 in the stator tooth set 61 is R different.

[0070] For example, Figure 8 Still taking the stator tooth group 61 including two stator teeth 11 as an example, the motor stator can be composed of stator tooth groups 61 composed of two stator teeth 11 repeatedly arranged, and each stator tooth group 61 can include a third stator tooth 801 and a fourth stator tooth 802. Obviously, the third stator tooth 801 and the fourth stator tooth 802 are both the above-mentioned Figures 1 to 5 The stator teeth 11 of any one of the above, namely the first tooth tip 112 and the second tooth tip 113 are arranged asymmetrically relative to the tooth column 111; for simplicity of illustration, Figure 8 The schematic diagram of some structures has been deleted. For details, please refer to other schematic diagrams. 6 Q 5 However, in terms of specific appearance size parameters, the first tooth tip length L corresponding to the third stator tooth 801 is L It can be L 4 , the first tooth tip length L corresponding to the fourth stator tooth 802 L It can be L 5 , and L 4 >L 5 or L 4 <L 5 , the second tooth tip length L corresponding to the third stator tooth 801 R It can be L 6 , the second tooth tip length L corresponding to the fourth stator tooth 802 R It can be L 7 , and L 6 <L 7 or L 6 >L 7 In some possible implementations, it may be L 4 <L 6 <L5 <L 7 .

[0071] Through the above arrangement, another arrangement mode of the motor stator teeth 11 can be provided. Since the motor stator includes the above Figures 1 to 5 The stator teeth 11 in the embodiment can therefore also reduce the noise level of the motor.

[0072] Fig. 9 Another schematic diagram of a motor stator structure provided in 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 same.

[0073] For example, Fig. 9 In the example, the stator tooth group 61 includes a stator tooth 11. In some possible implementations, the motor stator can be composed of a stator tooth group 61 composed of a stator tooth 11, and each stator tooth group 61 can include a fifth stator tooth 901. Obviously, the fifth stator tooth 901 is the above Figures 1 to 5 The stator teeth 11 of any one of the above, namely the first tooth tip 112 and the second tooth tip 113 are arranged asymmetrically relative to the tooth column 111; for simplicity of illustration, Fig. 9 The schematic diagram of some structures has been deleted. For details, please refer to other schematic diagrams. 8 Q 7 However, in terms of specific appearance size parameters, the first tooth tip length L corresponding to each fifth stator tooth 901 is L are all different. For example, the first tooth tip length L corresponding to a stator tooth No. 5 901 is L It can be L 8 , then the first tooth tip length L corresponding to the other stator tooth No. 5 901 is L Then it must not be L 8 , but can be L 9 , the second tooth tip length L corresponding to each fifth stator tooth 901 R Both can be L 10 .

[0074] Through the above arrangement, another arrangement mode of the motor stator teeth 11 can be provided. Since the motor stator includes the above Figures 1 to 5 The stator teeth 11 in the embodiment can therefore also reduce the noise level of the motor.

[0075] Fig.10Another schematic diagram of a motor stator structure provided in 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.

[0076] For example, Fig.10 Still taking 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 repeatedly arranged, and each stator tooth group 61 can include a sixth stator tooth 1001. Obviously, the sixth stator tooth 1001 is the above Figures 1 to 5 The stator teeth 11 of any one of the items, namely the first tooth tip 112 and the second tooth tip 113, are arranged asymmetrically for simplicity of illustration. Fig. 9 The schematic diagram of some structures has been deleted. For details, please refer to other schematic diagrams. 10 Q 9 However, in terms of specific appearance size parameters, the first tooth tip length L corresponding to each sixth stator tooth 1001 is L 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 , but can be L 12 , the second tooth tip length L corresponding to a stator tooth No. 5 901 R YesL 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 , but can be L 14 In some embodiments, L 1 ≠L 2 ≠L 3 ≠L 4 ≠L 5 ≠L 6 ≠L 7 ≠L 8 ≠L 9 ≠L 10 ≠L 11 ≠L 12 ≠L 13 ≠L 14 .

[0077] Through the above arrangement, another arrangement mode of the motor stator teeth 11 can be provided. Since the motor stator includes the above Figures 1 to 5The stator teeth 11 in the embodiment can therefore also reduce the noise level of the motor.

[0078] Fig.11 Another schematic diagram of a stator tooth structure provided in 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, and the first tooth tip height H L The corresponding direction is perpendicular to the first tooth tip length L L 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.

[0079] 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 height on the torque fluctuation and the radial electromagnetic force through the electromagnetic simulation optimization method. The embodiment of the present disclosure converts the tooth tip height into a second per-unit value for description, wherein the second per-unit value can be the first tooth tip height H corresponding to the first tooth tip 112 L The tooth tip head end height R corresponding to the first tooth tip 112 6 The ratio between the first tooth tip height H and the second tooth tip 113 may also be L The tooth tip head end height R corresponding to the second tooth tip 113 7 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, such as Fig.12 As shown; that is, the larger the second per-unit value is, the larger the tooth tip height is, and there is a unique and definite conversion relationship between the two that is a directly proportional function.

[0080] 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 ; Fig.12 This is a schematic diagram of the change of torque fluctuation with the second per unit value. Fig.12The horizontal axis in represents the second 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; Fig.13 It is a schematic diagram of the change of radial electromagnetic force with the second per unit value. Fig.13 The horizontal axis in represents the second per-unit value, and the vertical axis represents the torque fluctuation. The realized curve is the 48th order radial electromagnetic force, and the dotted curve is the 24th order radial electromagnetic force. Fig.14 It is a schematic diagram of the change of average torque and torque fluctuation peak-to-peak value with the second per unit value. Fig.14 The horizontal axis represents the second per-unit value, the vertical axis represents the average torque or the peak-to-peak value of the torque fluctuation, the solid line curve is the average torque, and the dotted line curve is the peak-to-peak value of the torque fluctuation. Figure 12 to Figure 14 The curve diagram can select a specific value of the second per-unit value in a possible embodiment. The principle of selecting the second per-unit value is combined with the actual situation. 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.

[0081] 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 fluctuation, thereby effectively reducing the noise generated by the motor.

[0082] Fig.15 Another schematic diagram of a motor stator structure provided for an embodiment of the present disclosure; in some embodiments, the motor stator is composed of multiple groups of stator tooth groups 1501 repeatedly arranged in a circumferential direction; wherein each group of stator tooth groups 1501 includes at least one stator tooth 11.

[0083] For example, similar to Figure 6 Corresponding embodiment, the above Figure 1 as well as Figures 11 to 14 The embodiment in the embodiment is an exemplary description of a single motor stator tooth 11, and the motor stator can be composed of multiple stator teeth 11, at least one stator tooth 11 can form a stator tooth group 1501, and the stator tooth group 1501 is repeatedly arranged along the circumferential direction of the motor rotor to form the overall structure of the motor stator. Obviously, the stator teeth 11 in each stator tooth group 1501 in the motor stator can be the above Figure 1 as well as Figures 11 to 14The stator teeth 11 in the embodiment are used to reduce the overall noise level of the motor. Fig.15 In the example, only one stator tooth 11 is used to form the stator tooth group 1501, so Fig.15 In the corresponding schematic diagram, the stator tooth group 1501 and the stator tooth 11 are framed by the same dotted line frame, but it is obvious that the two are not the same structure, but the stator tooth group 1501 includes the stator tooth 11.

[0084] Fig.16 Another schematic diagram of a motor stator structure provided in an embodiment of the present disclosure; in some embodiments, the stator tooth set 1501 includes more than two stator teeth 11, and for each set of stator tooth sets 1501, the first tooth tip height H corresponding to each stator tooth 11 in the stator tooth set 1501 is L Different from the above, the second tooth tip height H corresponding to each stator tooth 11 in the stator tooth set 1501 is R same.

[0085] For example, Fig.16 For example, each stator tooth group 1501 includes two stator teeth 11, where Q 14 Q 13 The motor stator can be composed of a stator tooth group 1501 composed of two stator teeth 11, each stator tooth group 1501 can include a seventh stator tooth 1601 and an eighth stator tooth 1602. Obviously, the seventh stator tooth 1601 and the seventh stator tooth 1601 are the above Figure 1 as well as Figures 11 to 14 The stator tooth 11 of any one of the above, that is, the first tooth tip 112 and the second tooth tip 113 are arranged asymmetrically relative to the tooth column 111; however, in terms of specific appearance size parameters, the first tooth tip height H corresponding to the seventh stator tooth 1601 is L It can be H 1 , the first tooth tip height H corresponding to the eighth stator tooth 1602 L It can be H 2 , and H 1 >H 2 or H 1 <H 2 ; The second tooth tip height H corresponding to the seventh stator tooth 1601 and the eighth stator tooth 1602 R Both can be H 3 .

[0086] In some other possible implementations, the stator tooth set 1501 may include three or more stator teeth 11. This situation is obviously the same as the above embodiment. The first tooth tip height H corresponding to the plurality of stator teeth 11 in the stator tooth set 1501 is LThe second tooth tip heights H corresponding to the plurality of stator teeth 11 may be different from each other. R Can be the same.

[0087] Through the above configuration, a motor stator tooth 11 arrangement method can be provided. Since the motor stator includes the above Figure 1 as well as Figures 11 to 14 The stator teeth 11 in the embodiment can therefore also reduce the noise level of the motor.

[0088] Fig.17 Another schematic diagram of a motor stator structure provided in an embodiment of the present disclosure; in some embodiments, the stator tooth set 1501 includes more than two stator teeth 11, and for each set of stator tooth sets 1501, the first tooth tip height H corresponding to each stator tooth 11 in the stator tooth set 1501 is L Different from the above, the second tooth tip height H corresponding to each stator tooth 11 in the stator tooth set 1501 is R different.

[0089] For example, Fig.17 Still taking the stator tooth group 1501 including two stator teeth 11 as an example, Q 16 Q 15 The motor stator can be composed of a stator tooth group 1501 composed of two stator teeth 11, each stator tooth group 1501 can include a ninth stator tooth 1701 and a tenth stator tooth 1702. Obviously, the ninth stator tooth 1701 and the tenth stator tooth 1702 are the above Figure 1 as well as Figures 11 to 14 The stator tooth 11 of any one of the above items, that is, the first tooth tip 112 and the second tooth tip 113 are arranged asymmetrically relative to the tooth column 111; however, in terms of specific appearance size parameters, the first tooth tip height H corresponding to the ninth stator tooth 1701 is L It can be H 4 , the first tooth tip height H corresponding to the tenth stator tooth 1702 L It can be H 5 , and H 4 >H 5 or H 4 <H 5 , the second tooth tip height H corresponding to the ninth stator tooth 1701 R It can be H 6 , the second tooth tip height H corresponding to the tenth stator tooth 1702 R It can be H 7 , and H 6 <H 7 or H 6 >H 7 In some possible embodiments, it may be H 4 <H6 <H 5 <H 7 .

[0090] Through the above arrangement, another arrangement mode of the motor stator teeth 11 can be provided. Since the motor stator includes the above Figure 1 as well as Figures 11 to 14 The stator teeth 11 in the embodiment can therefore also reduce the noise level of the motor.

[0091] Fig.18 Another schematic diagram of a motor stator structure provided in 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.

[0092] For example, Fig.18 In the example, the stator tooth group 1501 includes a stator tooth 11, wherein Q 18 Q 17 In some possible implementations, the motor stator may be composed of a stator tooth group 1501 consisting of a stator tooth 11 repeatedly arranged, and each stator tooth group 1501 may include an eleventh stator tooth 1801. Obviously, the eleventh stator tooth 1801 is the above Figure 1 as well as Figures 11 to 14 The stator teeth 11 of any one of the items, that is, the first tooth tip 112 and the second tooth tip 113 are arranged asymmetrically relative to the tooth column 111; however, in terms of specific appearance size parameters, the first tooth tip height H corresponding to each stator tooth No. 11 1801 is L are all different. For example, the first tooth tip height H corresponding to a stator tooth No. 11 1801 is L It can be H 8 , then the first tooth tip height H corresponding to the other stator tooth No. 11 1801 is L Then it must not be H 8 , but can be H 9 , the second tooth tip height H corresponding to each stator tooth No. 11 1801 R Both can be H 10 .

[0093] Through the above arrangement, another arrangement mode of the motor stator teeth 11 can be provided. Since the motor stator includes the above Figure 1 as well as Figures 11 to 14 The stator teeth 11 in the embodiment can therefore also reduce the noise level of the motor.

[0094] Fig.19Another schematic diagram of a motor stator structure provided in 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.

[0095] For example, Fig.19 Still taking the stator tooth group 1501 including a stator tooth 11 as an example, Q 20 Q 19 In some possible implementations, the motor stator can be composed of a stator tooth group 1501 composed of a stator tooth 11, each stator tooth group 1501 can include a twelfth stator tooth 1901, and it is obvious that the twelfth stator tooth 1901 is the above Figure 1 as well as Figures 11 to 14 The stator teeth 11 of any one of the items, that is, the first tooth tip 112 and the second tooth tip 113 are arranged asymmetrically; however, in terms of specific appearance size parameters, the first tooth tip height H corresponding to each twelfth stator tooth 1901 is L are all different. For example, the first tooth tip height H corresponding to a 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 , but can be H 12 , the second tooth tip height H corresponding to a certain stator tooth No. 12 1901 R YesL 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 , but can be H 14 .H 1 ≠H 2 ≠H 3 ≠H 4 ≠H 5 ≠H 6 ≠H 7 ≠H 8 ≠H 9 ≠H 10 ≠H 11 ≠H 12 ≠H 13 ≠H 14 .

[0096] Through the above arrangement, another arrangement mode of the motor stator teeth 11 can be provided. Since the motor stator includes the above Figures 1 to 5The stator teeth 11 in the embodiment can therefore also reduce the noise level of the motor.

[0097] In the above Figures 2 to 10 In the corresponding embodiment, only the tooth tip length is used as a variable for exemplary description, that is, it can be considered that Figures 2 to 10 In the corresponding embodiments, the height of the tooth tip is constant or not clearly defined; Figures 11 to 19 Similarly, in Figures 11 to 19 In the corresponding embodiment, only the tooth tip height is used as a variable for exemplary description, that is, it can be considered that Figures 11 to 19 In the corresponding embodiments, the tooth tip length is constant or not clearly defined. Obviously, both the tooth tip length and the tooth tip height are variables that affect the torque fluctuation and the radial electromagnetic force, that is, the tooth tip length and the tooth tip height can affect the noise level of the motor.

[0098] Therefore, in some other embodiments, Figures 2 to 10 The corresponding embodiments and Figures 11 to 19 The corresponding embodiments can be freely combined to form new embodiments. Fig. 9 and Fig.18 By combining the corresponding embodiments, the new motor stator structure is that the motor stator is formed by repeating the third stator tooth 11 group along the circumferential direction of the motor rotor; each group of the third stator teeth 11 includes a stator tooth 11, and the first tooth tip length LL corresponding to the stator teeth 11 in any two third stator tooth 11 groups is different, and the second tooth tip length LR corresponding to the stator teeth 11 in any two third stator tooth 11 groups is the same, and the first tooth tip height HL corresponding to the stator teeth 11 in any two third stator tooth 11 groups is different, and the second tooth tip height HR corresponding to the stator teeth 11 in any two third stator tooth 11 groups is the same.

[0099] 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.

[0100] After testing, the present disclosure summarizes some data results. Table 1 below is a table of electromagnetic simulation comparison results:

[0101] Table 1-Electromagnetic simulation comparison results

[0102]

[0103] In the above table, the simple structure of the stator tooth 11 in the first row - the symmetrical tooth tip structure, that is, NO.1 indicates that 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 , H16 represents the second tooth tip height H corresponding to the second tooth tip 113 R , W 1 represents the first per unit value corresponding to the first tooth tip 112, which can actually be regarded as the first tooth tip length L L , W 2 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 Obviously, the first tooth tip height H L Equal to the second tooth tip height H R , length of 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, and the H in the NO.2 column 17 represents the first tooth tip height H corresponding to the first tooth tip 112 L , H 18 represents the second tooth tip height H corresponding to the second tooth tip 113 R , W 3 represents the first per unit value corresponding to the first tooth tip 112, which can actually be regarded as the first tooth tip length L L , W 4 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 Obviously, the first tooth tip height H L Equal to the second tooth tip height H R , length of first tooth tip L L Greater than the second tooth tip length L R The complex structure in the first row - asymmetric tooth tip structure, that is, NO.3 means that in this solution, two stator teeth 11 are formed into a fourth stator tooth 11 group, and the motor stator is formed by repeatedly arranging the fourth stator tooth 11 group, and the stator tooth 11 group can include stator tooth No. 13 and stator tooth No. 14. 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, W 5 represents the first per unit value corresponding to the first tooth tip 112 in the thirteenth stator tooth, W 2 represents the first per unit value corresponding to the second tooth tip 113 in the thirteenth stator tooth, W 3 represents the first per unit value corresponding to the first tooth tip 112 in the fourteenth stator tooth, W 4 It 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 The height H of the first tooth tip in stator tooth No. 13 is not the same. L Equal to the height H of the first tooth tip in stator tooth No. 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 No. 14 R , the first tooth tip length L corresponding to stator tooth No. 13 and stator tooth No. 14 respectively L and the second tooth tip length L R Are not equal.

[0104] Continuing to refer to the above Table 1, the average torque can represent the ability of the motor to output power, that is, the larger 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 based on 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.

[0105] The present disclosure also provides a motor, comprising a motor stator as described in any one of the above motor stator embodiments.

[0106] Since the motor provided by the embodiment of the present disclosure includes the motor stator in the above embodiment, it can also achieve the same technical effect as the above motor stator embodiment, which will not be repeated here.

[0107] An embodiment of the present disclosure also 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 article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such 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 including 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 existence of other identical elements in the process, method, article or device including the elements.

[0110] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A stator tooth, characterized in that: The stator teeth include: A tooth column, a first tooth tip, and a second tooth tip; The first tooth tip is arranged at the first end of the tooth column, the second tooth tip is arranged at the second end of the tooth column, the first end is an opposite end of 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 and the second tooth tip have different appearance size parameters, and the first tooth tip and the second tooth tip are arranged asymmetrically relative to the tooth column.

2. The stator tooth according to claim 1, characterized in that: The appearance size parameters include the length of the tooth tip; 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 first tooth tip length is the minimum distance value between the end of the first tooth tip and the tooth column, and the second tooth tip length is the minimum distance value between the end of the second tooth tip and the tooth column; the head ends of the first tooth tip and the second tooth tip are connected to the tooth column, and the end is the opposite end of the head end.

3. The stator tooth according to claim 1 or 2, characterized in that: The appearance dimension parameters also include tooth tip height; 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; Among them, the first tooth tip height is the tooth tip height value at the end of the first tooth tip, 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. A motor stator, characterized in that: 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 according to any one of claims 1-3.

5. The motor stator according to claim 4, characterized in that: 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.

6. The motor stator according to claim 4, characterized in that: 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.

7. The motor stator according to claim 4, characterized in that: 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.

8. The motor stator according to claim 4, characterized in that: 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.

9. The motor stator according to claim 4, characterized in that: 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.

10. The motor stator according to claim 4, characterized in that: 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.

11. The motor stator according to claim 4, characterized in that: 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.

12. The motor stator according to claim 4, characterized in that: 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.

13. The motor stator according to claim 4, characterized in that: 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.

14. A motor, characterized in that: The motor comprises a stator tooth as claimed in any one of claims 1 to 3, or comprises a motor stator as claimed in any one of claims 4 to 13.

15. A vehicle, characterized in that: The vehicle comprises the electric machine of claim 14.

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