Motor stator, motor and vehicle

Abstract

The utility model provides a motor stator, a motor and a vehicle. A stator slot of a stator core of the motor stator is provided with a notch area opposite to a motor rotor; the notch area comprises a first groove wall and a second groove wall which extend along the axial direction of the motor stator, a first opening close to the motor rotor, and a second opening far away from the motor rotor; and at least part of the first groove wall forms a first blocking part for partially blocking the first opening along the radial direction of the motor stator, and / or at least part of the second groove wall forms a second blocking part for partially blocking the first opening along the radial direction of the motor stator. In this way, the straight-through area, communicated with the interior of the stator groove in the radial direction of the motor stator, of the first opening is reduced, then the opposite area of a winding in the stator groove and a motor rotor is reduced, stray capacitance between the winding and the motor rotor is reduced, and the electric corrosion risk of the motor bearing is reduced; electrocorrosion of the motor bearing can be restrained by adjusting the shape of the notch area, machining is easy to achieve, and the technical cost is saved.

Description

Technical Field

[0001] This application relates to the field of motor technology, specifically to a motor stator, a motor including the aforementioned motor stator, and a vehicle including the aforementioned motor. Background Technology

[0002] To address the electro-corrosion problem of motor bearings in new energy vehicle electric drives as they evolve towards higher voltage platforms and higher speeds, existing technologies primarily employ a combination of ceramic ball insulated bearings and conductive brushes / carbon brushes to suppress electro-corrosion. The ceramic ball insulated bearings at the non-drive end provide insulation, blocking the flow path of shaft voltage and current; simultaneously, conductive brushes / carbon brushes at the drive end discharge shaft voltage and current. However, this solution is technologically expensive, especially for ceramic ball insulated bearings used in commercial vehicles, which cost 6 to 10 times more than ordinary bearings of the same model. Furthermore, for SiC drive modules, high-frequency shaft current / voltage is the main cause of electro-corrosion in motor bearings. Because conductive brushes / carbon brushes exhibit inductive characteristics at high frequencies, they have high impedance to high-frequency voltage and current, making them prone to suppression failure. Utility Model Content

[0003] In view of this, this application provides a motor stator that solves the problems of high cost and easy failure of suppression caused by the suppression of electrical corrosion of motor bearings in the prior art.

[0004] In addition, this application also provides a motor including the above-mentioned motor stator.

[0005] In addition, this application also provides a vehicle including the aforementioned motor.

[0006] To achieve the above objectives, this application provides the following technical solution:

[0007] An electric motor stator is used to be sleeved on the outside of an electric motor rotor. The electric motor stator includes a stator core and windings. The stator core has stator slots for accommodating the windings.

[0008] The stator slot has a slot area opposite to the motor rotor; the slot area includes a first slot wall and a second slot wall extending along the axial direction of the motor stator, as well as a first opening near the motor rotor and a second opening away from the motor rotor;

[0009] At least a portion of the first slot wall forms a first blocking portion that partially blocks the first opening along the radial direction of the motor stator, and / or at least a portion of the second slot wall forms a second blocking portion that partially blocks the first opening along the radial direction of the motor stator.

[0010] Optionally, in the above-mentioned motor stator,

[0011] Along the direction from the first opening to the second opening, the first groove wall is inclined toward the direction of the second groove wall, and the first groove wall as a whole forms the first blocking part;

[0012] And / or,

[0013] Along the direction from the first opening to the second opening, the second groove wall is inclined toward the direction of the first groove wall, and the second groove wall as a whole forms the second blocking part.

[0014] Optionally, in the above-mentioned motor stator,

[0015] The cross-sectional shape of the slot area along the radial direction of the motor stator is a parallelogram;

[0016] or,

[0017] The slot area has a trapezoidal cross-sectional shape along the radial direction of the motor stator.

[0018] Optionally, in the above-mentioned motor stator,

[0019] The first groove wall has at least one first stepped surface extending toward the second groove wall, and the first stepped surface forms the first blocking portion;

[0020] And / or,

[0021] The second groove wall has at least one second stepped surface extending toward the first groove wall, and the second stepped surface forms the second blocking portion.

[0022] Optionally, in the above-mentioned motor stator, the cross-sectional shape of the slot area along the radial direction of the motor stator is "convex".

[0023] Optionally, in the above-mentioned motor stator,

[0024] At least a portion of the first groove wall is a first protruding area that protrudes toward the second groove wall; the first protruding area forms the first blocking portion;

[0025] And / or,

[0026] At least a portion of the second groove wall is a second protruding area that protrudes toward the first groove wall; the second protruding area forms the second blocking portion.

[0027] Optionally, in the above-mentioned motor stator, the first slot wall is integrally formed to form the first protruding area, the second slot wall is integrally formed to form the second protruding area, and the first protruding area and the second protruding area are axially symmetrically arranged.

[0028] Optionally, in the above-mentioned motor stator, the surface of the first protruding area is an arc-shaped surface, and the surface of the second protruding area is an arc-shaped surface.

[0029] An electric motor includes an electric motor rotor and an electric motor stator as described above.

[0030] A vehicle including the electric motor as described above.

[0031] As can be seen from the above, in the motor stator, motor, and vehicle disclosed in this application, the shape of the slot opening area of ​​the stator slot of the motor stator has been adjusted. The first slot wall and / or the second slot wall are no longer straight structures perpendicular to the first opening. Instead, the first slot wall forms a first blocking part that is not perpendicular to the first opening, and / or the second slot wall forms a second blocking part that is not perpendicular to the first opening. The first blocking part blocks a portion of the first opening along the radial direction of the motor stator, and the second blocking part blocks a portion of the first opening along the radial direction of the motor stator. As described above, the first opening is connected along the radial direction of the motor stator. The through area inside the stator slot is reduced. This through area is equal to the area of ​​the winding and the motor rotor facing each other in the stator slot. Therefore, the area of ​​the facing each other is also reduced, thereby reducing the stray capacitance between the winding and the motor rotor, which in turn reduces the shaft voltage of the motor bearing and reliably reduces the risk of electro-corrosion of the motor bearing. Furthermore, by adjusting the shape of the slot area, the effect of inhibiting electro-corrosion of the motor bearing can be achieved from the source. Compared with the combination of "ceramic ball insulated bearing + conductive brush / carbon brush", it is easier to process and greatly saves technical costs. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0033] Figure 1 This is a cross-sectional view of a stator slot in a motor provided in an embodiment of this application;

[0034] Figure 2 for Figure 1 A magnified view of a portion of region C in the middle;

[0035] Figure 3 for Figure 2 A magnified view of a portion of region D in the middle;

[0036] Figure 4 for Figure 3 Dimensioning drawing;

[0037] Figure 5 for Figure 2 A partial enlarged view of another embodiment of region D;

[0038] Figure 6 for Figure 2 A partial enlarged view of another embodiment of region D;

[0039] Figure 7 for Figure 2 A partial enlarged view of another embodiment of the central region D.

[0040] Figures 1-7 middle:

[0041] 1. Stator slot; 2. Winding; 3. Motor rotor; 4. Insulating paper; 5. Insulating varnish; 6. Void;

[0042] 11. First tank wall; 12. Second tank wall; 13. First opening; 14. Second opening;

[0043] 111. First stepped surface; 112. First vertical surface; 113. Second vertical surface;

[0044] 121. Second step surface; 122. Third vertical surface; 123. Fourth vertical surface. Detailed Implementation

[0045] This application provides an embodiment of a motor stator, a motor, and a vehicle.

[0046] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0047] like Figure 1-7 As shown, this application provides a motor stator for mounting on a motor rotor 3. The motor stator includes a stator core and windings 2. The stator core has stator slots 1 for accommodating the windings 2. The stator slots 1 have slot regions opposite to the motor rotor 3. The slot regions include a first slot wall 11 and a second slot wall 12 extending axially along the motor stator, and a first opening 13 near the motor rotor 3 and a second opening 14 away from the motor rotor 3. At least a portion of the first slot wall 11 forms a first blocking portion, which blocks a portion of the first opening 13 radially along the motor stator. And / or, at least a portion of the second slot wall 12 forms a second blocking portion, which blocks a portion of the first opening 13 radially along the motor stator.

[0048] It should be noted that, please refer to the appendix. Figure 3 , 5 -7. In each attached figure, the two dashed lines are the first opening 13 and the second opening 14 without solid material, and the two solid lines are the first slot wall 11 and the second slot wall 12 with stator core material, respectively. The surface where the first opening 13 is located, the surface where the first slot wall 11 is located, the surface where the second opening 14 is located, and the second slot wall 12 are connected in sequence, defining the spatial area where the slot area is located along the circumference.

[0049] Along the circumference of the motor stator, the motor stator is provided with multiple stator slots 1 spaced apart; please refer to the appendix. Figure 1 This is a cross-sectional view of a stator slot 1 in the motor. The view only shows the specific structure of one stator slot 1; the radial direction of the motor stator is... Figure 1 The direction indicated by the middle arrow. "The first blocking part blocks a portion of the first opening 13 along the radial direction of the motor stator," meaning that the projection of the first blocking part is located within the projection of the first opening 13 along the radial direction of the motor stator; "The second blocking part blocks a portion of the first opening 13 along the radial direction of the motor stator," meaning that the projection of the second blocking part is located within the projection of the first opening 13 along the radial direction of the motor stator. In some embodiments, the first blocking part is formed only in the first slot wall 11, and the second blocking part is not formed in the second slot wall 12; in some parallel embodiments, the second blocking part is formed only in the second slot wall 12, and the first blocking part is not formed in the first slot wall 11; in some parallel embodiments, the first blocking part is formed in both the first slot wall 11 and the second blocking part is formed in both the second slot wall 12.

[0050] It should be further explained that the stator slot 1 has a slot opening area that communicates with the internal space of the stator slot 1. The slot width direction of the slot opening area is from the first slot wall 11 to the second slot wall 12, i.e., attached... Figure 1 The direction indicated by the middle arrow. It is necessary to ensure that the first opening 13 has a certain width along the slot width direction of the slot area, so as to ensure the opening area of ​​the first opening 13, and thus ensure that there is a certain space at the first opening 13. As mentioned above, on the one hand, it is convenient to embed wires through the first opening 13, which ensures the processing time and cost of winding 2; on the other hand, the heat in the stator slot 1 can be effectively dissipated through the first opening 13 to avoid overheating of winding 2; and furthermore, it is necessary to avoid the space at the first opening 13 being too narrow, which would increase the magnetic flux density and affect the electromagnetic performance.

[0051] Formula for the voltage divider ratio of a motor bearing: (where: V) b V is the shaft voltage of the motor bearing. ng For common-mode voltage, C wr C is the stray capacitance between winding 2 and motor rotor 3. rs C is the stray capacitance between the stator core and the motor rotor 3. b K is the equivalent capacitance of the motor bearing.BVR (where V is the voltage division ratio of the motor bearing). From the above formula, it can be seen that the shaft voltage V of the motor bearing... b Depends on the voltage divider ratio K of the motor bearing BVR and common-mode voltage V ng Common-mode voltage V ng Related to the controller's hardware and software, the motor bearing voltage divider ratio K BVR The stray capacitance C between winding 2 and motor rotor 3 wr The positive correlation function, therefore, reduces the stray capacitance C between winding 2 and motor rotor 3. wr It can effectively reduce the voltage distribution ratio K of the motor bearing. BVR This reduces the risk of electro-corrosion of the motor bearings. Furthermore, the stray capacitance C between winding 2 and motor rotor 3... wr It is a parallel capacitor composed of multiple dielectrics, including winding 2, insulating paper 4, insulating varnish 5, etc. Based on the principle of parallel plate capacitors and parallel capacitors, the stray capacitance C between winding 2 and motor rotor 3 is reduced by changing the structural dimensions of the above-mentioned dielectrics. wr The effect is relatively effective, but changes in the structural dimensions of these media can affect the reliability of the insulation; however, reducing the face-to-face area between winding 2 and motor rotor 3 can effectively reduce the stray capacitance C between winding 2 and motor rotor 3. wr And it has no effect on insulation performance.

[0052] This application innovatively adjusts the shape of the slot opening area of ​​the stator slot 1. The first slot wall 11 and / or the second slot wall 12 are no longer straight structures perpendicular to the first opening 13. Instead, the first slot wall 11 forms a first blocking portion that is not perpendicular to the first opening 13, and / or the second slot wall 12 forms a second blocking portion that is not perpendicular to the first opening 13. The first blocking portion blocks a portion of the first opening 13 along the radial direction of the motor stator, and the second blocking portion blocks a portion of the first opening 13 along the radial direction of the motor stator. As described above, without reducing the first opening 13 along the radial direction... The width of the slot area in the slot width direction ensures the opening area of ​​the first opening 13, thereby ensuring that the first opening 13 has a certain space. Furthermore, the straight-through area of ​​the first opening 13 radially connecting to the interior of the stator slot 1 is reduced. This straight-through area is equal to the area of ​​the winding 2 and the motor rotor 3 facing each other within the stator slot 1. Therefore, the facing area is also reduced, thereby reducing the stray capacitance between the winding 2 and the motor rotor 3, and consequently reducing the shaft voltage of the motor bearing supporting the motor rotor 3, thus reliably reducing the risk of electro-corrosion of the motor bearing. Moreover, by adjusting the shape of the slot area, the effect of suppressing electro-corrosion of the motor bearing from the source can be achieved. Compared to the combination of "ceramic ball insulated bearing + conductive brush / carbon brush", this method is easier to manufacture and significantly saves technical costs.

[0053] Please see the appendix Figure 5 In the embodiments of this application, along the direction from the first opening 13 to the second opening 14, the first groove wall 11 is inclined toward the direction of the second groove wall 12, and the first groove wall 11 as a whole forms the first blocking part.

[0054] Optionally, the first groove wall 11 can be a planar wall, in which case the first groove wall 11 is inclined along a straight trajectory; alternatively, the first groove wall 11 can be a curved wall, in which case the first groove wall 11 is inclined along a curved trajectory.

[0055] The first slot wall 11 is inclined, ensuring that the projection of the first slot wall 11 along the radial direction of the motor stator is entirely within the projection of the first opening 13. This makes the first slot wall 11 an integral part of the first blocking portion, with each part of the first slot wall 11 contributing to the blocking of the first opening 13, further optimizing the shape of the slot area. Moreover, the inclined structure of the first slot wall 11 is simple, facilitating rapid production and saving manufacturing costs. In addition, changes in the inclination angle of the first slot wall 11 affect the blocking width of the first opening 13, thereby affecting the through area of ​​the first opening 13 radially connecting the stator slot 1 to the interior of the stator slot 1. Therefore, the inclination angle can be adjusted according to the required blocking width of the first opening 13 to facilitate flexible processing of the slot area and adapt to customer needs.

[0056] Please see the appendix Figure 3-5 In some parallel embodiments, along the direction from the first opening 13 to the second opening 14, the second groove wall 12 is inclined toward the direction of the first groove wall 11, and the second groove wall 12 as a whole forms the second blocking part.

[0057] Optionally, the second groove wall 12 can be a planar wall, in which case the second groove wall 12 is inclined along a straight trajectory; alternatively, the second groove wall 12 can be a curved wall, in which case the second groove wall 12 is inclined along a curved trajectory.

[0058] The second slot wall 12 is inclined, ensuring that the projection of the second slot wall 12 along the radial direction of the motor stator is entirely within the projection of the first opening 13. This makes the second slot wall 12 an integral part of the second blocking section, with each part contributing to the blocking of the first opening 13, further optimizing the shape of the slot area. Moreover, the inclined structure of the second slot wall 12 is simple, facilitating rapid production and saving manufacturing costs. Furthermore, changes in the inclination angle of the second slot wall 12 affect the blocking width of the first opening 13, thus affecting the through area of ​​the first opening 13 radially connecting the stator slot 1 to the interior of the stator. Therefore, the inclination angle can be adjusted according to the required blocking width of the first opening 13 to facilitate flexible processing of the slot area and adapt to customer needs.

[0059] It should be noted that the tilt angle of the first groove wall 11 is adjusted according to the required blocking width of the first opening 13 by the first groove wall 11, and the tilt angle of the second groove wall 12 is adjusted according to the required blocking width of the first opening 13 by the second groove wall 12. The process of determining the tilt angle of the first groove wall 11 is the same as that of the second groove wall 12. The following description uses the second groove wall 12 as an example:

[0060] ① Perform shaft voltage V of the motor bearing b Tests and stray capacitance C wr The test is based on the threshold voltage V (the threshold voltage V is the shaft voltage V obtained during the test). b Based on the required voltage reduction value, determine the target percentage of shaft voltage suppression for the motor bearing: m = V / V b ;

[0061] ② Determine the stray capacitance C between winding 2 and motor rotor 3 based on the target percentage m of shaft voltage suppression of the bearing and the above formula for the bearing voltage division ratio. wr The target for reduction is the stray capacitance C. wr The percentage decrease n;

[0062] ③ Based on the principle of parallel plate capacitors and stray capacitance C wr The percentage reduction n is used to calculate the percentage reduction q of the width of the first opening 13. The calculation formula is as follows: (Where: S is the through area of ​​the first opening 13 along the radial direction of the motor stator connecting the interior of the stator slot 1, that is, the area of ​​the winding 2 and the motor rotor 3 facing each other in the stator slot 1; d is the sum of the slot depth along the radial direction of the motor stator and the thickness of the gap 6 between the first opening 13 and the motor rotor 3; ε) r ε is the relative permittivity, and ε0 is the vacuum permittivity.

[0063] ④ Please refer to the appendix Figure 4 The formula for calculating the slot deviation angle θ is as follows: (Where: L is the width of the first opening 13, Lq is the required blocking width of the first opening 13 that is blocked by the second slot wall 12, and h is the slot depth of the slot area along the radial direction of the motor stator).

[0064] Please see the appendix Figure 3-4 In some embodiments of this application, the cross-sectional shape of the slot area along the radial direction of the motor stator is a parallelogram; there are two types: ① The first slot wall 11 is parallel to the second slot wall 12, the first slot wall 11 is inclined towards the second slot wall 12, and the second slot wall 12 is inclined away from the first slot wall 11. In this case, only the first slot wall 11 forms the first blocking part; ② Please refer to the appendix. Figure 3The first groove wall 11 is parallel to the second groove wall 12. The second groove wall 12 is inclined towards the first groove wall 11, and the first groove wall 11 is inclined away from the second groove wall 12. At this time, only the second groove wall 12 forms the second blocking part.

[0065] The cross-section of the slot area is set into a parallelogram shape, which is regular in shape and easy to process and produce. Moreover, the space volume of the slot area can be maximized under the premise that the width of the first opening 13 is determined and the first slot wall 11 or the second slot wall 12 can block the first opening 13 along the radial direction of the motor rotor 3.

[0066] Please see the appendix Figure 5 In some embodiments of this application, the cross-sectional shape of the slot area along the radial direction of the motor stator is trapezoidal. When the cross-section of the slot area is trapezoidal, the first slot wall 11 is inclined towards the second slot wall 12, and the second slot wall 12 is inclined towards the first slot wall 11. In this case, the first slot wall 11 forms a first blocking part, and the second slot wall 12 forms a second blocking part. As described above, the structural form of the slot area is enriched, and it can be flexibly processed according to actual needs.

[0067] Please see the appendix Figure 6 In some embodiments of this application, the first groove wall 11 has at least one first stepped surface 111 extending toward the second groove wall 12, and the first stepped surface 111 forms a first blocking portion. Along the radial direction of the motor stator, the projection of the first stepped surface 111 is entirely within the projection of the first opening 13, and the first stepped surface 111 achieves the blocking of a portion of the first opening 13 along the radial direction of the motor stator.

[0068] Optionally, the second opening 14 is smaller than the first opening 13, and along the radial direction of the motor stator, the projection of the second opening 14 lies within the projection of the first opening 13. Optionally, the extension direction of the first step surface 111 can be parallel to the slot width direction of the slot area; in this case, the first step surface 111 is a plane. Optionally, from the first slot wall 11 to the second slot wall 12, the first step surface 111 can be inclined towards the first opening 13 or towards the second opening 14; in this case, the first step surface 111 can be an inclined plane inclined along a straight trajectory or a curved surface inclined along a curved trajectory. The first groove wall 11 includes a first vertical surface 112 perpendicular to the first opening 13 and extending from the first opening 13 to the second opening 14, and a second vertical surface 113 perpendicular to the second opening 14 and extending from the second opening 14 to the first opening 13. When the first groove wall 11 has only one first step surface 111, the two ends of the first step surface 111 along its extension direction are respectively connected to the first vertical surface 112 and the second vertical surface 113. When there are multiple first step surfaces 111, the multiple first step surfaces 111 are arranged sequentially from the first groove wall 11 to the second groove wall 12, and each pair of adjacent first step surfaces 111 are connected by an intermediate vertical surface. The multiple first step surfaces 111 are connected to form a combination, and the two ends of the combination along the sequential arrangement direction of the multiple first step surfaces 111 are respectively connected to the first vertical surface 112 and the second vertical surface 113.

[0069] As shown above, the structural form of the first blocking part is further enriched, which in turn enriches the structural form of the slot area, allowing for flexible processing according to actual needs.

[0070] Please see the appendix Figure 6 In some embodiments, the second groove wall 12 has at least one second stepped surface 121 extending toward the first groove wall 11, and the second stepped surface 121 forms a second blocking portion. Along the radial direction of the motor stator, the projection of the second stepped surface 121 is entirely within the projection of the first opening 13, and the second stepped surface 121 achieves the blocking of a portion of the first opening 13 along the radial direction of the motor stator.

[0071] Optionally, the second opening 14 is smaller than the first opening 13, and along the radial direction of the motor stator, the projection of the second opening 14 lies within the projection of the first opening 13. Optionally, the extension direction of the second step surface 121 can be parallel to the slot width direction of the slot area; in this case, the second step surface 121 is a plane. Optionally, in the direction from the second slot wall 12 to the first slot wall 11, the second step surface 121 can be inclined towards the first opening 13 or towards the second opening 14; in this case, the second step surface 121 can be an inclined plane inclined along a straight trajectory or a curved surface inclined along a curved trajectory. The second groove wall 12 includes a third vertical surface 122 perpendicular to the first opening 13 and extending from the first opening 13 to the second opening 14, and a fourth vertical surface 123 perpendicular to the second opening 14 and extending from the second opening 14 to the first opening 13. When the second groove wall 12 has only one second step surface 121, the two ends of the second step surface 121 along its extension direction are respectively connected to the third vertical surface 122 and the fourth vertical surface 123. When there are multiple second step surfaces 121, the multiple second step surfaces 121 are arranged sequentially from the second groove wall 12 to the first groove wall 11, and each pair of adjacent second step surfaces 121 are connected by an intermediate vertical surface. The multiple second step surfaces 121 are connected to form a combination, and the two ends of the combination along the sequential arrangement direction of the multiple second step surfaces 121 are respectively connected to the third vertical surface 122 and the fourth vertical surface 123.

[0072] As shown above, the structural form of the second blocking part is further enriched, which in turn enriches the structural form of the slot area, allowing for flexible processing according to actual needs.

[0073] Please see the appendix Figure 6 In some embodiments of this application, the cross-sectional shape of the slot region along the radial direction of the motor stator is convex. When the cross-section of the slot region is convex, the first slot wall 11 has a first step surface 111 parallel to the slot width direction of the slot region, and the first step surface 111 forms a first blocking portion; the second slot wall 12 has a second step surface 121 parallel to the slot width direction of the slot region, and the second step surface 121 forms a second blocking portion. As shown above, the slot region has a regular shape, which is convenient for processing and production, and also enriches the structural form of the slot region, allowing for flexible processing according to actual needs.

[0074] Please see the appendix Figure 7 In some embodiments of this application, at least a portion of the first groove wall 11 is a first protruding area that protrudes toward the second groove wall 12; the first protruding area forms a first blocking portion.

[0075] Optionally, the second opening 14 is the same size as the first opening 13, and along the radial direction of the motor stator, the projection of the second opening 14 overlaps with the projection of the first opening 13. Along the radial direction of the motor stator, the projection of the first protruding area is entirely within the projection of the first opening 13, thus partially blocking the first opening 13 along the radial direction of the motor stator. As described above, this further enriches the structural form of the first blocking part, and consequently enriches the structural form of the slot area, allowing for flexible processing according to actual needs.

[0076] Please see the appendix Figure 7 In some embodiments, at least a portion of the second groove wall 12 is a second protruding area protruding towards the first groove wall 11; the second protruding area forms a second blocking portion. Optionally, the second opening 14 is the same size as the first opening 13, and along the radial direction of the motor stator, the projection of the second opening 14 overlaps with the projection of the first opening 13. Along the radial direction of the motor stator, the projection of the second protruding area is entirely within the projection of the first opening 13, thus blocking a portion of the first opening 13 along the radial direction of the motor stator. As described above, the structural form of the second blocking portion is further enriched, thereby enriching the structural form of the groove area, which can be flexibly processed according to actual needs.

[0077] In some embodiments of this application, the first groove wall 11 integrally forms a first protruding area, and the second groove wall 12 integrally forms a second protruding area, with the first groove wall 11 and the second groove wall 12 arranged symmetrically. As shown above, the groove area has a regular shape and is arranged symmetrically, which facilitates processing and production, and enriches the structural form of the groove area, allowing for flexible processing according to actual needs.

[0078] Of course, in addition to the first groove wall 11 forming the first protruding area as a whole and the second groove wall 12 forming the second protruding area as a whole, the first groove wall 11 can also form the first protruding area in the middle region of the radial direction of the motor stator, and the second groove wall 12 can form the second protruding area in the middle region of the radial direction of the motor stator. The first and second protruding areas can also be formed in other locations, which will not be listed here.

[0079] In some embodiments of this application, the surface of the first protruding area is an arc-shaped surface, and the surface of the second protruding area is an arc-shaped surface. As shown above, the surfaces of the first and second protruding areas are smooth and rounded, and there are no stress concentration areas, which helps to ensure the structural strength of the area surrounding the slot; moreover, it will not hinder the installation of the winding 2, and facilitates the processing of the winding 2.

[0080] Of course, in addition to being curved surfaces, the surfaces of the first and second protruding areas can also be prism surfaces, frustum surfaces, or pyramid surfaces, which will not be listed here.

[0081] In summary, this application also provides an electric motor, which includes a motor stator as described above.

[0082] Since the motor of this application includes the motor stator described above, the beneficial effects of the motor stator are described above and will not be repeated here.

[0083] In summary, this application also provides a vehicle that includes the motor described above.

[0084] Since the vehicle described in this application includes the motor mentioned above, the beneficial effects of the motor on the vehicle are described above and will not be repeated here.

[0085] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0086] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0087] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this application.

[0088] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0089] It should be understood that the qualifying terms “first,” “second,” “third,” “fourth,” “fifth,” and “sixth” used in the description of the embodiments of this application are only used to more clearly illustrate the technical solutions and are not intended to limit the scope of protection of this application.

[0090] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. An electric machine stator for being fitted around an electric machine rotor, characterized in that The motor stator includes a stator core and a winding (2), and the stator core has a stator slot (1) for accommodating the winding (2); The stator slot (1) has a slot area opposite to the motor rotor; the slot area includes a first slot wall (11) and a second slot wall (12) extending along the axial direction of the motor stator, and a first opening (13) near the motor rotor and a second opening (14) away from the motor rotor. At least a portion of the first groove wall (11) forms a first blocking portion that partially blocks the first opening (13) along the radial direction of the motor stator, and / or at least a portion of the second groove wall (12) forms a second blocking portion that partially blocks the first opening (13) along the radial direction of the motor stator.

2. The motor stator according to claim 1, characterized in that, Along the direction from the first opening (13) to the second opening (14), the first groove wall (11) is inclined toward the second groove wall (12), and the first groove wall (11) is integrally formed as the first blocking part; And / or, Along the direction from the first opening (13) to the second opening (14), the second groove wall (12) is inclined toward the first groove wall (11), and the second groove wall (12) forms the second blocking part in its entirety.

3. The motor stator according to claim 2, characterized in that, The cross-sectional shape of the slot area along the radial direction of the motor stator is a parallelogram; or, The slot area has a trapezoidal cross-sectional shape along the radial direction of the motor stator.

4. The motor stator according to claim 1, characterized in that, The first groove wall (11) has at least one first step surface (111) extending toward the second groove wall (12), and the first step surface (111) forms the first blocking portion; And / or, The second groove wall (12) has at least one second step surface (121) extending toward the first groove wall (11), and the second step surface (121) forms the second blocking portion.

5. The motor stator of claim 4, wherein, The slot area has a convex cross-sectional shape along the radial direction of the motor stator.

6. The motor stator according to claim 1, characterized in that, At least a portion of the first groove wall (11) is a first protruding area that protrudes toward the second groove wall (12); the first protruding area forms the first blocking portion; And / or, At least a portion of the second groove wall (12) is a second protruding area that protrudes toward the first groove wall (11); the second protruding area forms the second blocking portion.

7. The motor stator of claim 6, wherein, The first groove wall (11) is integrally formed to form the first protruding area, and the second groove wall (12) is integrally formed to form the second protruding area, and the first protruding area and the second protruding area are symmetrically arranged.

8. The motor stator of claim 7, wherein, The surface of the first protruding area is an arc-shaped surface, and the surface of the second protruding area is an arc-shaped surface.

9. An electric machine characterized by It includes a motor rotor and a motor stator as described in any one of claims 1-8.

10. A vehicle characterized by comprising: Includes the motor as described in claim 9.

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