stator core, motor, automobile

Abstract

The present invention provides a stator core, a motor, and an automobile, wherein the stator core includes a plurality of stacked stator laminations, each of which includes a yoke ring and a plurality of first teeth and a plurality of second teeth located on an inner ring of the yoke ring. A plane perpendicular to the axis of the stator laminations is a projection plane, and projected on the projection plane, the plurality of first teeth and the plurality of second teeth are alternately arranged along the circumference of the yoke ring. The tooth shoe of the first tooth is constructed with an open slot and two grooves, the two grooves being located on either side of the open slot, the open slot being symmetrically arranged about the centerline of the first tooth, and the two grooves being symmetrically arranged about the centerline of the first tooth. According to the present invention, the air gap magnetic flux distribution is facilitated, harmonic content is optimized, and motor torque pulsation is reduced, while also improving processing technology and enhancing mass production manufacturability.

Description

Technical Field

[0001] The present invention belongs to the technical field of motor manufacturing, and in particular relates to a stator core, a motor, and a car. Background Art

[0002] Permanent magnet-assisted synchronous reluctance motors (PMSMs) offer high reluctance torque. With the assistance of permanent magnets, they not only improve the power factor but also partially increase the permanent magnet torque, thereby increasing the resulting torque. Compared to PMSMs, PMSMs offer higher power density and a wider range of speed capabilities, while using less magnets. Their lower back EMF also ensures the durability, lifespan, and reliability of the controller. Therefore, PMSMs will increasingly be used in new energy vehicles, particularly high-speed passenger vehicle drive motors, in the future.

[0003] However, these motors have high saliency, large air gap waveform distortion, and high torque ripple, resulting in a significant increase in radial electromagnetic force. Without proper design, vibration and noise can easily occur. With the development of the new energy vehicle industry and the continued expansion of the consumer base, consumers are increasingly demanding vehicle performance and the driving experience of new energy vehicles. One of the most significant factors affecting this experience is vehicle vibration and noise. As one of the core power components driving new energy vehicles, the motor is the primary source of vehicle vibration and noise, exerting the most significant and direct impact on vehicle ride comfort. Summary of the Invention

[0004] Therefore, the present invention provides a stator core, a motor, and a vehicle, which can overcome the shortcomings of the related art such as unreasonable structural design of the stator core, which leads to large motor air gap waveform distortion, large vibration noise, and large torque pulsation.

[0005] In order to solve the above problems, the present invention provides a stator core, comprising a plurality of stacked stator punchings, wherein the stator punchings include a yoke ring and a plurality of first teeth and a plurality of second teeth on the inner ring of the yoke ring. A plane perpendicular to the axis of the stator punchings is a projection plane. Projected on the projection plane, the plurality of first teeth and the plurality of second teeth are alternately arranged one by one along the circumference of the yoke ring. An open slot and two grooves are constructed on the tooth shoe of the first tooth. The two grooves are respectively located on both sides of the open slot. The open slot is symmetrically arranged about the center line of the first tooth and the two grooves are symmetrically arranged about the center line of the first tooth.

[0006] In some embodiments, when projected on the projection plane, the groove is in an arc shape, the tooth shoe is located on a first circle Ca, and the center of the groove is located on the first circle Ca.

[0007] In some embodiments, the line between the center of the groove and the center of the stator punching sheet is a first line, and the first line forms an angle a with the center line of the first tooth where the groove is located, 8°≤a≤10°; and / or, the radius of the groove is r1, the circumferential width of the tooth boot is d, r1=d / 16.

[0008] In some embodiments, the open groove includes a circular arc groove portion and a rectangular groove portion, wherein the rectangular groove portion is located on a side of the circular arc groove portion close to the yoke ring, and the rectangular groove portion is connected to the circular arc groove portion.

[0009] In some embodiments, the center of the circular arc groove is on the first circle Ca, and / or the radius of the circular arc groove is r2, r2=d / 4.

[0010] In some embodiments, the rectangular groove has a first straight side parallel to the center line of the first tooth and a second straight side perpendicular to the center line of the first tooth, the length of the first straight side is L1, the length of the second straight side is L2, and L1 = (2-2.5) L2.

[0011] In some embodiments, L1 = r2 + 0.012 mm.

[0012] In some embodiments, a first air groove is further configured on the first tooth, and the first air groove is symmetrical about a center line of the first tooth.

[0013] In some embodiments, the first air slot is a rectangular slot having a third straight side parallel to the center line of the first tooth and a second straight side perpendicular to the center line of the first tooth, the length of the third straight side is L3, the length of the fourth straight side is L4, and the outer diameter of the stator punching sheet is r, L3 / r=0.125, L4 / r=0.16.

[0014] In some embodiments, a second air slot is configured on the yoke ring. The second air slot is configured at a position on the yoke ring corresponding to each first tooth and is symmetrical about a center line of the corresponding first tooth.

[0015] In some embodiments, the second air groove includes a first circular arc groove segment and a second circular arc groove segment that are relative and connected, wherein the first circular arc groove segment is located on the side of the second circular arc groove segment close to the first tooth, the radius of the first circular arc groove segment is r3, the radius of the second circular arc groove segment is r4, and the outer circle diameter of the stator punching is r, r3=1mm+r-r4.

[0016] In some embodiments, r-r4=0.2 mm to 0.5 mm.

[0017] The present invention also provides a motor comprising the above-mentioned stator core.

[0018] The present invention also provides a car comprising the above-mentioned motor.

[0019] The present invention provides a stator core, a motor, and a vehicle, in which second teeth are alternately arranged with first teeth having grooves and open slots. This is beneficial to the air gap magnetic density distribution, optimizes the harmonic content, and reduces the motor torque pulsation. At the same time, it can also improve the processing technology and enhance mass production manufacturability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the structure of the stator punching sheet in the stator core according to an embodiment of the present invention (projected along its axial direction);

[0021] Figure 2 for Figure 1 A partial enlarged view of point A in the middle;

[0022] Figure 3 for Figure 1 A partial enlarged view of point B in the middle.

[0023] The reference numerals indicate:

[0024] 1. Stator punching sheet; 11. Yoke ring; 21. First tooth; 211. Open slot; 212. Groove; 22. Second tooth; 3. First air slot; 4. Second air slot; 41. First circular arc slot segment; 42. Second circular arc slot segment. DETAILED DESCRIPTION

[0025] See also Figures 1 to 3 As shown, according to an embodiment of the present invention, a stator core is provided, comprising a plurality of stacked stator punching sheets 1, the stator punching sheet 1 comprising a yoke ring 11 and a plurality of first teeth 21 and a plurality of second teeth 22 on the inner ring of the yoke ring 11, a plane perpendicular to the axis of the stator punching sheet 1 is a projection plane, and projected on the projection plane, the plurality of first teeth 21 and the plurality of second teeth 22 are alternately arranged one by one along the circumference of the yoke ring 11, an open slot 211 and two grooves 212 are constructed on the tooth shoe of the first tooth 21, the two grooves 212 are respectively located on both sides of the open slot 211, the open slot 211 is symmetrically arranged about the center line of the first tooth and the two grooves 212 are symmetrically arranged about the center line of the first tooth 21, the symmetrical distribution can make the air gap magnetic density distribution more uniform, reduce waveform distortion, and optimize harmonic content. In this technical solution, the second teeth 22 and the first teeth 21 having grooves 212 and open slots 211 are alternately arranged, which is beneficial to the air gap magnetic density distribution, optimizes the harmonic content, and reduces the motor torque pulsation. At the same time, it can also improve the processing technology and enhance mass production manufacturability.

[0026] In some embodiments, when projected on the projection plane, the groove 212 is arc-shaped, the tooth shoe is on the first circle Ca, and the center of the groove 212 is on the first circle Ca. This is conducive to positioning the center of the circle during processing and reduces the difficulty of the processing technology.

[0027] In some embodiments, the line between the center of the groove 212 and the center of the stator punching sheet 1 is the first line, and the angle a formed between the first line and the center line of the first tooth 21 where the groove 212 is located is 8°≤a≤10°, preferably 10°, so that the groove 212 can be located at the top of the tooth, the air gap length can be changed, and the motor torque pulsation can be reduced; and / or, the radius of the groove 212 is r1, the circumferential width of the tooth shoe is d, r1=d / 16, so that the harmonic content and vibration noise of the motor can be effectively suppressed while meeting the output performance. Figure 1 As shown, the circumferential width of the aforementioned tooth shoe refers to the arc length between the left end and the right end of the same tooth shoe along the circumferential direction of the stator core. In a specific embodiment, 0.2mm≤r1≤0.3mm, preferably, r1=0.25mm.

[0028] In some embodiments, the open groove 211 includes a circular arc groove portion and a rectangular groove portion, wherein the rectangular groove portion is located on a side of the circular arc groove portion close to the yoke ring 11 , and the rectangular groove portion is connected to the circular arc groove portion.

[0029] In some embodiments, the center of the arc groove portion is on the first circle Ca, and / or the radius of the arc groove portion is r2, where r2=d / 4, which can optimize the cogging torque reduction performance of the open groove 211. In a specific embodiment, 1 mm ≤ r2 ≤ 1.5 mm.

[0030] In some embodiments, the rectangular groove portion has a first straight side parallel to the center line of the first tooth 21 and a second straight side perpendicular to the center line of the first tooth 21, the length of the first straight side is L1, the length of the second straight side is L2, L1 = (2-2.5) L2, preferably, L1 = 2.088L2, so as to be able to effectively suppress and weaken the vibration noise of the motor. In some embodiments, L1 = r2 + 0.012mm, further enhancing the suppression and weakening effect of the motor vibration noise. In a specific embodiment, 0.84mm ≤ L1 ≤ 1.25mm, preferably 1.044mm. Further, the length of the second straight side is L2, 0.4mm ≤ L2 ≤ 0.6mm, preferably 0.5mm.

[0031] In some embodiments, a first air slot 3 is further constructed on the first tooth 21, and the first air slot 3 is symmetrical about the center line of the first tooth 21. The setting of the first air slot 3 can effectively suppress the high-order harmonics generated by the motor and reduce the motor torque pulsation, vibration and noise caused by the high-order harmonics. Specifically, in some embodiments, the first air slot 3 is a rectangular slot, and the rectangular slot has a third straight side parallel to the center line of the first tooth 21 and a second straight side perpendicular to the center line of the first tooth 21. The length of the third straight side is L3, the length of the fourth straight side is L4, and the outer diameter of the stator punching sheet 1 is r, L3 / r=0.125, L4 / r=0.16, so as to improve the suppression of the high-order harmonics generated by the motor and reduce the motor torque pulsation, vibration and noise caused by the high-order harmonics. In a specific embodiment, 2.5mm≤L3≤2.6mm, 0.4mm≤L4≤0.6mm.

[0032] In some embodiments, a second air slot 4 is constructed on the yoke ring 11. The second air slot 4 is constructed at the position of the yoke ring 11 corresponding to each first tooth 21 and is symmetrical about the center line of the corresponding first tooth 21. It can effectively suppress the subharmonics concentrated in the stator yoke, thereby reducing the harmonic content and reducing the vibration noise of the motor. Specifically, the second air slot 4 includes a first arc slot segment 41 and a second arc slot segment 42 that are relative and connected, wherein the first arc slot segment 41 is on the side of the second arc slot segment 42 close to the first tooth 21, the radius of the first arc slot segment 41 is r3, the radius of the second arc slot segment 42 is r4, and the outer diameter of the stator punching 1 is r, r3=1mm+r-r4, which can more effectively suppress the subharmonics concentrated in the stator yoke, thereby reducing the harmonic content and reducing the vibration noise of the motor. In some embodiments, r-r4=0.2mm~0.5mm, preferably 0.3mm; r3=1mm~1.5mm, preferably 1.3mm, r4=19mm~20mm, preferably 19.7mm, r=19.3mm~20.3mm.

[0033] The present invention addresses the problems of large air gap waveform distortion and torque ripple in permanent magnet-assisted synchronous reluctance motors, which result in a significant increase in radial electromagnetic force and high motor noise. By optimizing the stator lamination structure, the present invention adds air-assisted slots (i.e., first air slots 3 and second air slots 4) to the stator teeth and yoke to suppress the high-order harmonics and subharmonics generated by the motor, reducing vibration noise. Slots (i.e., grooves 212 and open slots 211) are added to the tops of the stator teeth to increase the number of stator slots, reducing cogging torque and motor vibration noise.

[0034] According to an embodiment of the present invention, a motor is further provided, in particular, a permanent magnet assisted synchronous reluctance motor, comprising the above-mentioned stator core.

[0035] According to an embodiment of the present invention, there is also provided a car comprising the above-mentioned motor.

[0036] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0037] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention. The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art may make various improvements and variations without departing from the technical principles of the present invention, and such improvements and variations shall also be considered within the scope of protection of the present invention.

Claims

1. A stator core comprising a plurality of stacked stator laminations (1), characterized in that: The stator punching sheet (1) includes a yoke ring (11) and a plurality of first teeth (21) and a plurality of second teeth (22) on an inner ring of the yoke ring (11). A plane perpendicular to the axis of the stator punching sheet (1) is a projection plane. Projected on the projection plane, the plurality of first teeth (21) and the plurality of second teeth (22) are alternately arranged one by one along the circumference of the yoke ring (11). An open slot (211) and two grooves (212) are constructed on the tooth shoe of the first tooth (21). The two grooves (212) are respectively located on both sides of the open slot (211) and are spaced apart in the circumferential direction of the tooth shoe of the first tooth (21). The open slot (211) is symmetrically arranged about the center line of the first tooth (21) and the two grooves (212) are symmetrically arranged about the center line of the first tooth (21). The tooth shoe of the second tooth (22) does not have the open groove (211) and the two grooves (212); the open groove (211) includes a circular arc groove portion and a rectangular groove portion, wherein the rectangular groove portion is located on the side of the circular arc groove portion close to the yoke ring (11), and the rectangular groove portion is connected to the circular arc groove portion. When projected on the projection plane, the groove (212) is in the shape of a circular arc, the tooth shoe is located on a first circle Ca, and the center of the circular arc groove portion is located on the first circle Ca, and the center of the groove (212) is located on the first circle Ca; the rectangular groove portion has a first straight side parallel to the center line of the first tooth (21) and a second straight side perpendicular to the center line of the first tooth (21), the length of the first straight side is L1, the length of the second straight side is L2, and L1=(2-2.5)L2.

2. The stator core according to claim 1, characterized in that A line connecting the center of the groove (212) and the center of the stator punching sheet (1) is a first line, and an angle a is formed between the first line and the center line of the first tooth (21) where the groove (212) is located, 8°≤a≤10°; and / or, the radius of the groove (212) is r1, the circumferential width of the tooth shoe is d, r1=d / 16.

3. The stator core according to claim 1, characterized in that The radius of the arc groove is r2, r2=d / 4.

4. The stator core according to claim 1, characterized in that L1= r2+0.012mm.

5. The stator core according to claim 1, characterized in that A first air groove (3) is also formed on the first tooth (21), and the first air groove (3) is symmetrical about the center line of the first tooth (21).

6. The stator core according to claim 5, characterized in that The first air slot (3) is a rectangular slot having a third straight side parallel to the center line of the first tooth (21) and a fourth straight side perpendicular to the center line of the first tooth (21), the length of the third straight side is L3, the length of the fourth straight side is L4, the outer diameter of the stator punching sheet (1) is r, L3 / r=0.125, L4 / r=0.

16.

7. The stator core according to claim 1, characterized in that A second air slot (4) is constructed on the yoke ring (11), and the second air slot (4) is constructed at a position on the yoke ring (11) corresponding to each first tooth (21), and is symmetrical about a center line of the corresponding first tooth (21).

8. The stator core according to claim 7, characterized in that The second air slot (4) comprises a first circular arc slot segment (41) and a second circular arc slot segment (42) which are opposite and connected, wherein the first circular arc slot segment (41) is located on a side of the second circular arc slot segment (42) close to the first tooth (21), the radius of the first circular arc slot segment (41) is r3, the radius of the second circular arc slot segment (42) is r4, the outer diameter of the stator punching sheet (1) is r, and r3=1mm+r-r4.

9. The stator core according to claim 8, characterized in that r-r4=0.2mm~0.5mm.

10. A motor, characterized in that: A stator core comprising the stator core according to any one of claims 1 to 9.

11. An automobile, characterized in that: Including the motor according to claim 10.

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