Motor stator and motor

Abstract

The motor stator comprises an iron core and a plurality of windings, the iron core comprises a yoke part and a plurality of tooth parts, the plurality of tooth parts are located at the inner side of the yoke part and are arranged at intervals along the circumferential direction of the yoke part, and a wire slot is formed between any two adjacent tooth parts. Each wire duct comprises a closed end close to the yoke part and an open end far away from the yoke part, and the width of the wire duct is gradually reduced from the closed end to the open end; each winding comprises a first coil layer and a second coil layer which are wound on the corresponding tooth part, the first coil layer comprises a first coil part close to the open end and a second coil part close to the closed end, and the second coil layer is wound on the outer side of the second coil part; the first coil part comprises a plurality of coil single bodies, the plurality of coil single bodies are arranged in a crossed manner at one end of the tooth part in the height direction, the parts in the wire slots are arranged in parallel along the length direction of the tooth part, and the second coil layer is connected with one coil single body relatively close to the second coil layer in the plurality of coil single bodies.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a motor stator and a motor. Background Technology

[0002] The slot fill factor of a motor refers to the ratio of the cross-sectional area of ​​the conductors in the motor slot to the total volume of the motor slot. It is an important indicator for measuring motor performance and directly affects the motor's efficiency, heat dissipation, and other performance characteristics. Because the shape of a motor slot is similar to a triangle, the space is larger near the iron core yoke and smaller further away. For motors with a high slot fill factor, the winding has more layers near the yoke and fewer layers further away, making the thickness of the winding near the yoke greater than that further away. This adapts to the shape of the motor slot and achieves a higher slot fill factor.

[0003] However, in existing windings, when winding the second layer of coil after the first layer is completed, the conductor must first extend obliquely from the end of the first layer coil away from the yoke towards the initial position of the second layer coil within the motor slot. This obliquely extending conductor intersects with the conductor of the first layer coil within the motor slot, resulting in an increase in the overall thickness of the winding away from the yoke. When using a needle tip for winding, the risk of the needle tip contacting this obliquely extending conductor as it moves within the motor slot increases, raising the risk of the needle tip scraping and damaging the conductor. Utility Model Content

[0004] In view of this, the present invention provides a motor stator and a motor to solve the problem in the prior art where the crossing part of the wires is inside the motor slot, which increases the risk of wire damage during the winding process.

[0005] On the one hand, this application provides a motor stator, comprising:

[0006] An iron core includes a yoke and a plurality of teeth. The yoke is annular, and the teeth are located inside the yoke and spaced apart circumferentially. A groove is formed between any two adjacent teeth. Each groove includes a closed end near the yoke and an open end away from the yoke. The width of the groove gradually decreases from the closed end to the open end.

[0007] Multiple windings, each winding is wound on a corresponding tooth, each winding includes a first coil layer wound on the corresponding tooth and a second coil layer wound outside the first coil layer, the first coil layer includes a first coil portion near the open end and a second coil portion near the closed end, the second coil layer is wound outside the second coil portion;

[0008] The first coil section includes multiple coil units, which are arranged crosswise at one end of the tooth height direction and parallelly arranged along the length direction of the tooth in the groove. The second coil layer is connected to one of the multiple coil units that is relatively close to the second coil layer.

[0009] In some embodiments, each coil unit of the first coil portion includes a main body and a connecting portion. The corresponding main bodies are connected to each other and the second coil layer is connected to the corresponding main body through the corresponding connecting portion. The plurality of main bodies are arranged in parallel along the length direction of the tooth, and the plurality of connecting portions are located at one end of the height direction of the tooth and are arranged crosswise.

[0010] In some embodiments, the plurality of coil units include an inner coil unit connected to the second coil portion, an outer coil unit connected to the inner coil unit, and at least one intermediate coil unit for connecting the outer coil unit to the second coil layer, wherein the main body of the inner coil unit is close to the second coil portion and spaced apart from the main body of the outer coil unit to form an accommodating space, and the main body of the intermediate coil unit is located within the accommodating space.

[0011] In some embodiments, the number of intermediate coil units is one, the inner coil unit includes a first main body and a first connecting part, the outer coil unit includes a second main body and a second connecting part, and the intermediate coil unit includes a third main body and a third connecting part;

[0012] One end of the first main body is connected to the second coil part. The first connecting part extends obliquely from the other end of the first main body away from the yoke to one end of the second main body. The second connecting part extends obliquely from the other end of the second main body towards the yoke to one end of the third main body. The third connecting part extends obliquely from the other end of the third main body towards the yoke to the second coil layer. The second connecting part and the third connecting part are intersected with the first connecting part.

[0013] In some embodiments, the motor stator further includes an insulating component connected to the iron core, the insulating component being used to separate the winding from the corresponding tooth;

[0014] The insulating component has a limiting groove for each winding, and the first coil layer portion is located within the limiting groove.

[0015] In some embodiments, the insulating assembly includes insulating frames located at both ends of the iron core along the axial direction. The insulating frame includes an annular base connected to the yoke and a plurality of fitting portions connected to the inner side of the annular base. The plurality of fitting portions are arranged at intervals along the circumferential direction of the annular base and correspond one-to-one with the plurality of teeth. One end of the teeth is embedded in the fitting portion along the axial direction of the yoke. At least one of the insulating frames has the limiting groove on the fitting portion.

[0016] In some embodiments, the fitting portion includes two spaced-apart opposing sidewalls and an end wall connected between the two sidewalls, the two sidewalls and the end wall forming a fitting groove, one end of the tooth being embedded in the corresponding fitting groove, and a limiting groove being provided on the side of the sidewall opposite to the fitting groove and extending axially along the annular base.

[0017] In some embodiments, the sidewall of the fitting portion is provided with a plurality of limiting grooves, and the plurality of limiting grooves are arranged in parallel along the extending direction of the sidewall.

[0018] In some embodiments, the two sidewalls of the fitting portion are respectively provided with a plurality of limiting grooves, and the plurality of limiting grooves on the two sidewalls are provided in a one-to-one correspondence.

[0019] On the other hand, this application also provides an electric motor, including a motor rotor and a motor stator as described above, wherein the motor stator is used to drive the motor rotor to rotate after the winding is energized.

[0020] The motor stator provided by this utility model has multiple coil units arranged crosswise at one end in the tooth height direction. This allows one of the coil units, which is used to connect to the second coil layer, to be relatively closer to the second coil layer. Furthermore, after the multiple coil units cross at one end in the tooth height direction, the portions of the multiple coil units located in the wire slot can be arranged in parallel, avoiding the coil unit connected to the second coil layer from crossing with other coil units in the wire slot. This reduces the space occupied by the winding at the open end of the wire slot, thereby reducing the risk of the winding tool contacting the coil unit at the open end and damaging the coil unit during the winding process. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a motor stator provided in an embodiment of the present invention;

[0022] Figure 2 for Figure 1 An exploded view of the motor stator shown in the diagram;

[0023] Figure 3 for Figure 1 A schematic diagram of the assembly of the iron core and one of the windings shown in the figure;

[0024] Figure 4 for Figure 3 A schematic diagram of the winding structure shown;

[0025] Figure 5 for Figure 4 A cross-sectional view of the winding shown;

[0026] Figure 6 for Figure 4 An exploded view of the first coil layer shown;

[0027] Figure 7 for Figure 6 An exploded view of the first coil section shown in the diagram;

[0028] Figure 8 for Figure 1 The diagram shows the assembly of the iron core and insulation components.

[0029] Figure 9 for Figure 8 An exploded view of the iron core and insulation components shown in the diagram;

[0030] Figure 10 for Figure 9 The diagram shows the structure of the insulating frame.

[0031] In the diagram: 10, motor stator; 12, iron core; 14, winding; 16, yoke; 18, toothed part; 20, wire groove; 22, closed end; 24, open end; 26, blocking part; 28, first coil layer; 30, second coil layer; 32, coil unit; 34, third coil layer; 36, first coil section; 38, second coil section; 40, main body section; 42, connecting part; 44, inner coil unit; 46, outer coil unit; 48, middle coil unit; 50, accommodating space; 52, first main body section; 54, first connecting part; 56, second main body section; 58, second connecting part; 60, third main body section; 62, third connecting part; 64, insulation component; 66, limiting groove; 68, insulation frame; 70, annular base; 72, fitting part; 74, side wall; 76, end wall; 78, fitting groove; 80, insulating paper. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0033] It should be noted that all directional indicators (such as up, down, left, right, front, back, inside, outside, top, bottom, etc.) in the embodiments of this utility model are only used to explain the relative positional relationship between the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0034] It should also be noted that when a component is referred to as "fixed to" or "set on" another component, the component may be directly on the other component or there may be an intervening component present. When a component is referred to as "connected to" another component, it may be directly connected to the other component or there may be an intervening component present.

[0035] Please see Figures 1 to 10 An embodiment of the present invention provides an electric motor, including a motor stator 10 and a motor rotor, which are electromagnetically coupled. When current is passed through the motor stator 10, a magnetic field is generated, and the motor rotor rotates relative to the motor stator 10 under the action of the magnetic field.

[0036] The motor stator 10 includes an iron core 12 and a plurality of windings 14 disposed on the iron core 12. The iron core 12 supports the plurality of windings 14, and the windings 14 generate a magnetic field after current is applied to drive the motor rotor to rotate. The iron core 12 includes a yoke 16 and a plurality of teeth 18. The yoke 16 is annular, and the plurality of teeth 18 are located inside the yoke 16 and are arranged at intervals along the circumference of the yoke 16. The number of teeth 18 is the same as the number of windings 14 and corresponds one-to-one. Each winding 14 is wound on a corresponding tooth 18.

[0037] A groove 20 is formed between any two adjacent teeth 18 to accommodate the winding 14. Each groove 20 includes a closed end 22 near the yoke 16 and an open end 24 away from the yoke 16. The width of the groove 20 gradually decreases from the closed end 22 to the open end 24. The width of the groove 20 is the distance between two adjacent teeth 18 in the circumferential direction of the yoke 16. The distance between two adjacent teeth 18 is the largest at the end near the yoke 16 and the smallest at the end away from the yoke 16. Multiple teeth 18 extend from the inner wall of the yoke 16 toward the central axis of the yoke 16, causing the distance between two adjacent teeth 18 to gradually decrease along its extension direction, thus creating the effect that the width of the groove 20 gradually decreases from the closed end 22 to the open end 24. The extension direction of the teeth 18 is the length direction of the teeth 18, which is consistent with the corresponding radial direction of the yoke 16.

[0038] Multiple teeth 18 are identical in shape and size and are evenly arranged along the circumference of the yoke 16, thereby making multiple grooves 20 identical in size.

[0039] Each tooth 18 has a stop 26 at the end away from the yoke 16. The stop 26 is set at an angle to the corresponding tooth 18 to prevent the winding 14 from sliding off the tooth 18 in a direction away from the yoke 16.

[0040] Each winding 14 includes a first coil layer 28 wound on a corresponding tooth 18 and a second coil layer 30 wound outside the first coil layer 28, with the first coil layer 28 located between the second coil layer 30 and the tooth 18. Both the first coil layer 28 and the second coil layer 30 include a plurality of coil cells 32, and the number of coil cells 32 in the first coil layer 28 is greater than the number of coil cells 32 in the second coil layer 30, such that the first coil layer 28 is partially located inside the second coil layer 30 and partially located outside the second coil layer 30, with the portion of the first coil layer 28 located outside the second coil layer 30 being close to the opening end 24 of the slot 20.

[0041] In an alternative example, the winding 14 further includes a third coil layer 34 wound around the outside of the second coil layer 30, and the third coil layer 34 is positioned close to the closed end 22.

[0042] Each first coil layer 28 includes a first coil portion 36 near the open end 24 and a second coil portion 38 near the closed end 22. That is, the first coil portion 36 and the second coil portion 38 are arranged along the length direction of the tooth portion 18, and the second coil portion 38 is closer to the yoke portion 16 of the iron core 12 than the first coil portion 36. The second coil layer 30 is wound around the outside of the second coil portion 38.

[0043] Each first coil section 36 includes a plurality of coil units 32. The plurality of coil units 32 are arranged crosswise at one end of the tooth section 18 in the height direction and parallelly arranged along the length direction of the tooth section 18 in the portion within the groove 20. The height direction of the tooth section 18 is consistent with the axial direction of the yoke section 16, and the length direction is consistent with the corresponding radial direction of the yoke section 16. The second coil layer 30 is connected to one of the coil units 32 that is relatively close to the second coil layer 30. Relatively close to the second coil layer 30 means that, along the length direction of the tooth section 18, the distance between the portion of the coil unit 32 (i.e., the coil unit 32 connected to the second coil layer 30) located in the groove 20 and the end of the second coil layer 30 away from the yoke section 16 is not less than the distance between the first coil section 36 and the end of the first coil section 36 away from the yoke section 16. After the coil units 32 cross, the extension direction of the wire used to form the winding 14 changes, allowing the coil units 32 connected to the second coil layer 30 to be relatively close to the second coil layer 30 for winding. Furthermore, the crossing points of multiple coil units 32 are located at one end of the tooth 18 in the height direction, so that the portions of the multiple coil units 32 in the first coil section 36 located within the wire groove 20 do not need to cross, thus creating a parallel arrangement. Since the coil units 32 connected to the second coil layer 30 do not cross with other coil units 32 in the first coil section 36 within the wire groove 20, the space occupied by the winding 14 at the open end 24 of the wire groove 20 is reduced, thereby reducing the risk of damage to the coil unit 32 due to contact between the winding tool, such as a needle tip, and the coil unit 32 at the open end 24 during winding.

[0044] Each coil unit 32 of the first coil section 36 includes a main body 40 and a connecting part 42. The main body 40 is generally U-shaped, with its two sides located on opposite sides of the tooth section 18. The end connecting the two sides is located at one end of the tooth section 18 in the height direction. The connecting part 42 is located at the other end of the tooth section 18 in the height direction and is connected to the main body 40. The connecting part 42 extends obliquely from one side of the tooth section 18 to the other opposite side of the tooth section 18. Corresponding main bodies 40 are connected to each other, and the second coil layer 30 is connected to the main body 40 of the corresponding coil unit 32 through corresponding connecting parts 42. Multiple main bodies 40 are arranged in parallel along the length direction of the tooth section 18, and multiple connecting parts 42 are located at one end of the tooth section 18 in the height direction and are arranged crosswise to transfer the crossing parts of multiple coil units 32 to one end of the tooth section 18 in the height direction, avoiding crossing in the wire groove 20 and occupying too much space in the wire groove 20, and reducing the risk of the needle tip and the coil unit 32 scratching in the wire groove 20.

[0045] The plurality of coil units 32 include an inner coil unit 44, an outer coil unit 46 and at least one intermediate coil unit 48. The inner coil unit 44 is connected to the second coil section 38, the outer coil unit 46 is connected to the inner coil unit 44, and the intermediate coil unit 48 is connected to the outer coil unit 46 and the second coil layer 30. The main body 40 of the inner coil layer is located between the main body 40 of the outer coil layer and the second coil portion 38, and the main body 40 of the inner coil layer and the main body 40 of the outer coil layer are spaced apart to form an accommodating space 50 between them. The main body 40 of the intermediate coil unit 48 is located in the accommodating space 50, so that the main bodies 40 of the inner coil unit 44, the intermediate coil unit 48 and the outer coil unit 46 are arranged in parallel along the length direction of the tooth portion 18. The connecting portion 42 of the inner coil unit 44 extends obliquely away from the yoke portion 16, and the connecting portion 42 of the outer coil unit 46 and the connecting portion 42 of the intermediate coil unit 48 extend obliquely towards the yoke portion 16, so that the connecting portion 42 of the outer coil unit 46 and the connecting portion 42 of the intermediate coil unit 48 are intersected with the connecting portion 42 of the inner coil unit 44.

[0046] In an optional example, there is one intermediate coil unit 48. The main body 40 and the connecting part 42 of the inner coil unit 44 are respectively the first main body 52 and the first connecting part 54. The main body 40 and the connecting part 42 of the outer coil unit 46 are respectively the second main body 56 and the second connecting part 58. The main body 40 and the connecting part 42 of the intermediate coil unit 48 are respectively the third main body 60 and the third connecting part 62. The third main body 60 is located between the first main body 52 and the second main body 56. The first main body 52, the second main body 56 and the third main body 60 are all U-shaped, with their two ends located on opposite sides of the toothed part 18.

[0047] One end of the first main body portion 52 is connected to the second coil portion 38. The first connecting portion 54 extends obliquely from the other end of the first main body portion 52 away from the first side of the tooth portion 18 to the opposite second side in a direction away from the yoke portion 16, and is connected to one end of the second main body portion 56. The second connecting portion 58 extends obliquely from the other end of the second main body portion 56 towards the yoke portion 16 from the second side of the tooth portion 18 to the first side, and is connected to one end of the third main body portion 60. The third connecting portion 62 extends obliquely from the other end of the third main body portion 60 towards the yoke portion 16 from the second side of the tooth portion 18 to the first side, and is connected to the second coil layer 30. The second connecting portion 58 and the third connecting portion 62 are located on the side of the first connecting portion 54 away from the tooth portion 18. The first connecting portion 54 extends obliquely away from the yoke portion 16, while the second connecting portion 58 and the third connecting portion 62 extend obliquely towards the yoke portion 16. The oblique directions are different, so that the second connecting portion 58 and the third connecting portion 62 intersect with the first connecting portion 54.

[0048] In one embodiment, the motor stator 10 further includes an insulating component 64 connected to the iron core 12. The insulating frame 68 is fixed relative to the iron core 12. The insulating component 64 is used to separate the winding 14 from the corresponding tooth 18 to avoid the risk of short circuit caused by direct contact between the winding 14 and the tooth 18.

[0049] The insulation component 64 is located between the first coil layer 28 and the tooth 18. The insulation component 64 is provided with a limiting groove 66 for each winding 14. The first coil layer 28 is partially located in the limiting groove 66, thereby forming a limiting effect on the first limiting groove 66 in the length direction of the tooth 18, fixing the winding 14 at the corresponding position of the tooth 18, and enhancing the stability of the winding 14.

[0050] The insulating component 64 is provided with a plurality of limiting slots 66 corresponding to each winding 14. The plurality of limiting slots 66 extend along the length direction of the tooth portion 18. The first coil portion 36 and the second coil portion 38 of the first coil layer 28 each include a plurality of coil units 32. The plurality of coil units 32 of the second coil portion 38 and the second coil portion 38 are arranged along the length direction of the tooth portion 18, and the sum of the number of coil units 32 of the first coil portion 36 and the second coil portion 38 is the same as the number of the plurality of limiting slots 66 corresponding to the winding 14. Each coil unit 32 is respectively engaged with a limiting slot 66, thereby forming a limiting effect on the plurality of coil units 32, further enhancing the limiting effect.

[0051] Understandably, the limiting groove 66 may mate with the main body 40 of the coil unit 32, or with the connecting portion 42 of the coil unit 32, or simultaneously with both the main body 40 and the connecting portion 42 of the coil unit 32. In this embodiment, the limiting groove 66 extends axially along the yoke 16 and mates with the main body 40 of the coil unit 32.

[0052] The insulation assembly 64 includes insulation frames 68 located at both axial ends of the core 12 to separate at least two axial ends of the winding 14 from the teeth 18, and at least one insulation frame 68 is provided with a limiting groove 66. In an optional example, two insulation frames 68 are provided with limiting grooves 66 respectively, and the limiting grooves 66 on the two insulation frames 68 are provided in a one-to-one correspondence to further enhance the limiting effect on the winding 14.

[0053] The insulating frame 68 includes an annular base 70 and a plurality of fitting portions 72. The annular base 70 is connected to the yoke 16. The plurality of fitting portions 72 are located inside the annular base 70 and are arranged at intervals along the circumference of the annular base 70. The plurality of fitting portions 72 extend from the inner wall of the annular base 70 toward the central axis of the annular base 70, so that the arrangement of the plurality of fitting portions 72 is the same as the arrangement of the plurality of teeth 18, and the number of fitting portions 72 and teeth 18 is the same and corresponds one-to-one. At least one fitting portion 72 is provided with a limiting groove 66. The annular base 70 is fixedly connected to the yoke 16 of the iron core 12, thereby fixing the insulating frame 68 to the iron core 12. One end of the teeth 18 in the axial direction of the yoke 16 is embedded in the fitting portion 72. The fitting portion 72 is used to separate the axial end of the teeth 18 from the teeth 18 to form an insulating effect.

[0054] The fitting portion 72 includes two spaced-apart opposing sidewalls 74 and an end wall 76 connected between the two sidewalls 74. The two sidewalls 74 and the end wall 76 form a U-shaped structure, which together form a fitting groove 78. One end of the tooth 18 in the axial direction of the yoke 16 is embedded in the fitting groove 78. At this time, the two sidewalls 74 are located on opposite sides of the tooth 18, and the end wall 76 is located at one end of the tooth 18. The limiting groove 66 is provided on the side of the sidewall 74 away from the fitting groove 78 and extends along the axial direction of the annular base 70 to cooperate with the main body 40 of the coil unit 32 to form a limiting effect.

[0055] The sidewall 74 of the fitting part 72 is provided with a plurality of limiting grooves 66. The plurality of limiting grooves 66 are arranged in parallel along the extension direction of the sidewall 74, that is, the plurality of limiting grooves 66 are arranged sequentially and parallel to each other along the extension direction of the sidewall 74. The plurality of coil units 32 of the first coil layer 28 are arranged in parallel along the extension direction of the tooth 18. The extension direction of the tooth 18 is consistent with the extension direction of the sidewall 74, so that the arrangement of the plurality of limiting grooves 66 is consistent with the arrangement of the plurality of coil units 32 in the length direction of the tooth 18, so that the plurality of limiting grooves 66 correspond one-to-one with the plurality of coil units 32, thereby forming a limiting effect on each coil unit 32 of the first coil layer 28.

[0056] The two side walls 74 of the fitting part 72 are respectively provided with a plurality of limiting grooves 66. The plurality of limiting grooves 66 on the two side walls 74 correspond one to one, so that the two corresponding limiting grooves 66 on the two side walls 74 respectively cooperate with the two sides of the main body part 40 to further enhance the limiting effect on the coil unit 32.

[0057] In one embodiment, the insulating assembly 64 includes insulating paper 80 located inside the iron core 12. The number of insulating papers 80 is multiple, the same as the number of wire grooves 20, with one insulating paper 80 disposed in each wire groove 20. Two insulating frames 68 are spaced apart axially along the yoke 16. Along the axial direction of the yoke 16, the insulating paper 80 is located between the two insulating frames 68, and the height of the insulating paper 80 is the same as or close to the distance between the two insulating frames 68.

[0058] The insulating paper 80 includes two spaced-apart insulating portions and a fixing portion connected between the two insulating portions. The fixing portion is fixedly connected to the yoke 16 of the iron core 12. The two insulating portions are respectively attached to the two adjacent sides of the two adjacent teeth 18. The two insulating frames 68 separate the two ends of the winding 14 in the axial direction of the yoke 16 from the teeth 18 through the fitting portion 72. The insulating paper 80 separates the middle part of the winding 14 from the teeth 18 through the insulating portion, forming the effect of separating the entire winding 14 from the teeth 18.

[0059] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A motor stator, characterized in that, include: An iron core includes a yoke and a plurality of teeth. The yoke is annular, and the teeth are located inside the yoke and spaced apart circumferentially. A groove is formed between any two adjacent teeth. Each groove includes a closed end near the yoke and an open end away from the yoke. The width of the groove gradually decreases from the closed end to the open end. Multiple windings, each winding is wound on a corresponding tooth, each winding includes a first coil layer wound on the corresponding tooth and a second coil layer wound outside the first coil layer, the first coil layer includes a first coil portion near the open end and a second coil portion near the closed end, the second coil layer is wound outside the second coil portion; The first coil section includes multiple coil units, which are arranged crosswise at one end of the tooth height direction and parallelly arranged along the length direction of the tooth in the groove. The second coil layer is connected to one of the multiple coil units that is relatively close to the second coil layer.

2. The motor stator according to claim 1, characterized in that, Each coil unit of the first coil section includes a main body and a connecting part. The corresponding main bodies are connected to each other and the second coil layer is connected to the corresponding main body through the corresponding connecting part. The multiple main bodies are arranged in parallel along the length direction of the tooth, and the multiple connecting parts are located at one end of the height direction of the tooth and are arranged crosswise.

3. The motor stator according to claim 2, characterized in that, The plurality of coil units include an inner coil unit connected to the second coil portion, an outer coil unit connected to the inner coil unit, and at least one intermediate coil unit for connecting the outer coil unit to the second coil layer. The main body of the inner coil unit is close to the second coil portion and spaced apart from the main body of the outer coil unit to form an accommodating space. The main body of the intermediate coil unit is located within the accommodating space.

4. The motor stator according to claim 3, characterized in that, The number of intermediate coil units is one. The inner coil unit includes a first main body and a first connecting part. The outer coil unit includes a second main body and a second connecting part. The intermediate coil unit includes a third main body and a third connecting part. One end of the first main body is connected to the second coil part. The first connecting part extends obliquely from the other end of the first main body away from the yoke to one end of the second main body. The second connecting part extends obliquely from the other end of the second main body towards the yoke to one end of the third main body. The third connecting part extends obliquely from the other end of the third main body towards the yoke to the second coil layer. The second connecting part and the third connecting part are intersected with the first connecting part.

5. The motor stator according to any one of claims 1-4, characterized in that, The motor stator also includes an insulating component connected to the iron core, the insulating component being used to separate the winding from the corresponding tooth; The insulating component has a limiting groove for each winding, and the first coil layer portion is located within the limiting groove.

6. The motor stator according to claim 5, characterized in that, The insulation assembly includes insulation frames located at both ends of the iron core along the axial direction. Each insulation frame includes an annular base connected to the yoke and a plurality of fitting portions connected to the inner side of the annular base. The plurality of fitting portions are arranged at intervals along the circumference of the annular base and correspond one-to-one with the plurality of teeth. One end of each tooth is embedded in the fitting portion along the axial direction of the yoke. At least one of the insulation frames has a limiting groove on its fitting portion.

7. The motor stator according to claim 6, characterized in that, The fitting portion includes two sidewalls spaced apart and opposite to each other, and an end wall connected between the two sidewalls. The two sidewalls and the end wall surround and form a fitting groove. One end of the tooth is embedded in the corresponding fitting groove. The limiting groove is provided on the side of the sidewall opposite to the fitting groove and extends along the axial direction of the annular base.

8. The motor stator according to claim 7, characterized in that, The sidewall of the fitting part is provided with a plurality of limiting grooves, which are arranged in parallel along the extending direction of the sidewall.

9. The motor stator according to claim 7, characterized in that, The two side walls of the fitting part are respectively provided with a plurality of limiting grooves, and the plurality of limiting grooves on the two side walls are respectively provided in a one-to-one correspondence.

10. An electric motor, characterized in that, It includes a motor rotor and a motor stator as described in any one of claims 1-9, the motor stator being used to drive the motor rotor to rotate after the windings are energized.

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