Stator structure with stepped notches

Abstract

The invention relates to the field of motors, and provides a stator structure with stepped notches, which comprises a stator core, a stator end plate and a fixing assembly, the stator core is provided with a stator slot, the stator slot is used for inserting bottom slot paper, and two opposite ends of the stator core are provided with stator end plates; the projection of the slot wall of the stator slot falls in the projection of the stator end plate along the extension direction of the stator slot; one side, facing the stator iron core, of the stator end plate is provided with a limiting groove, and the limiting groove is used for inserting the end part of the bottom groove paper; the fixing assembly is used for driving the bottom groove paper to abut against the groove wall of the limiting groove. According to the stator end plate, the paperboard grooves and the stator grooves are designed to be inconsistent in groove type or size, so that the bottom groove paper is limited between the two stator end plates. And the end part of the bottom groove paper extends into the limiting groove, so that the bottom groove paper is further limited and fixed. The fixing assembly can prevent the bottom groove paper from being separated from the limiting groove, and the problem that the fixing effect of the bottom groove paper is poor is solved.

Description

Technical Field

[0001] The present application relates to the field of electric motors, and in particular to a stator structure with stepped slots. Background Art

[0002] The stator core and stator end plate are the main parts of the motor stator. The stator core is provided with multiple stator slots, and the stator slots are provided with stator windings. The stator windings generate magnetic fields by energizing the motor to work. Bottom slot paper is provided in the stator slots, which is used to separate the stator windings from the metal stator core, thereby playing an insulating role. The stator end plate is provided with cardboard slots corresponding to the stator slots one by one. The cardboard slots can be regarded as an extension of the stator slots, which are used to further fix and support the stator windings.

[0003] During the stator winding process and the use of the motor, the bottom slot paper is prone to move, which affects the insulation effect. At present, technicians have taken some measures to prevent the bottom slot paper from sliding, such as using sticky bottom slot paper and bonding the bottom slot paper to the inner wall of the stator slot.

[0004] However, during long-term use, the viscosity of the bottom groove paper may decrease, and the bottom groove paper may still move during the vibration of the motor, affecting the insulation effect. Summary of the invention

[0005] In order to solve the problem of poor fixing effect of bottom slot paper, the present application provides a stator structure with stepped slots.

[0006] The present application provides a stator structure with stepped slots adopting the following technical solution: A stator structure with stepped slots comprises a stator core, a stator end plate and a fixing assembly.

[0007] The stator core is provided with stator slots, the stator slots are used for inserting bottom slot paper, and the stator end plates are provided at opposite ends of the stator core.

[0008] Along the extension direction of the stator slot, the projection of the slot wall of the stator slot falls within the projection of the stator end plate.

[0009] A limiting groove is provided on one side of the stator end plate facing the stator core, and the limiting groove is used for inserting the end of the bottom slot paper.

[0010] The fixing assembly is used to drive the bottom slot paper to abut against the slot wall of the limiting slot.

[0011] By adopting the above solution, the bottom slot paper is restricted between the two stator end plates, and the bottom slot paper is fixed in the limiting groove to prevent the bottom slot paper from moving.

[0012] Optionally, a connecting hole communicating with the limiting groove is provided in the stator end plate.

[0013] The fixing assembly comprises a driving unit and a fixing member, and the driving unit is connected to the fixing member.

[0014] The driving unit is configured to move to drive the fixing member to move, so that the fixing member passes through the connecting hole into the limiting groove and fixes the bottom groove paper.

[0015] By adopting the above solution, the fixing member can enter the limiting groove through the connecting hole and fix the bottom groove paper.

[0016] Optionally, the fixing member is used to drive the bottom slot paper to move to abut against the inner wall of the limiting slot on a side away from the communicating hole.

[0017] By adopting the above solution, the bottom slot paper is clamped between the fixing member and the inner wall of the limiting slot.

[0018] Optionally, a limiting hole corresponding to the communicating hole is provided on the bottom groove paper, and the fixing member is used to pass through the limiting hole and abut against a side wall of the limiting groove on a side away from the communicating hole.

[0019] By adopting the above solution, the fixing piece can limit the position of the bottom slot paper without abutting against the bottom slot paper.

[0020] Optionally, a recessed portion is provided on a side wall of the limiting groove away from the communicating hole, and the recessed portion is used to abut against the fixing member.

[0021] By adopting the above solution, the fixing member can at least partially extend into the recessed portion, thereby enhancing the limiting effect on the bottom slot paper.

[0022] Optionally, the drive unit is slidably connected to the stator end plate.

[0023] The driving unit is provided with a first positioning portion, the stator end plate is provided with a second positioning portion, and the first positioning portion and the second positioning portion are limitedly matched.

[0024] By adopting the above solution, the driving unit can drive the fixing member to move by sliding, and the driving unit can be locked by the limiting cooperation between the first positioning portion and the second positioning portion.

[0025] Optionally, the driving unit includes a locking bolt and a connecting piece.

[0026] The connecting member is connected to the fixing member.

[0027] The stator end plate is provided with a threaded hole parallel to the communicating hole.

[0028] The locking bolt is rotatably connected to the connecting piece, and the locking bolt is threadedly connected to the stator end plate through the threaded hole.

[0029] By adopting the above solution, the fixing member can be translated when the locking bolt is turned, thereby enabling the fixing member to fix the bottom slot paper.

[0030] Optionally, the connecting hole is not perpendicular to the limiting groove, the recessed portion is located at the bottom of the limiting groove, and the fixing member is used to drive the end of the bottom groove paper to bend to abut against the recessed portion, and the bending angle of the end of the bottom groove paper is less than 90°.

[0031] By adopting the above solution, the fixing member can exert a force on the bottom slot paper in an inclined direction, which helps to flatten the bottom slot paper and better fix the bottom slot paper.

[0032] Optionally, the notch opening of the limiting groove is expanded, and the side wall of the limiting groove away from the communicating hole is flush with the inner wall of the stator slot.

[0033] By adopting the above solution, the bottom slot paper can be attached to the inner wall of the stator slot, reducing the probability of the bottom slot paper interfering with the stator winding process.

[0034] Optionally, a positioning piece is provided on one of the stator end plate and the stator core, and a third positioning portion that cooperates with the positioning piece in a limiting manner is provided on the other.

[0035] By adopting the above solution, the stator end plate and the stator core can be quickly connected.

[0036] The present application designs the paperboard slot and the stator slot to have different slot types or sizes, so that the bottom slot paper is restricted between the two stator end plates. The end of the bottom slot paper extends into the limiting slot, thereby further limiting and fixing the bottom slot paper. The fixing component can prevent the bottom slot paper from being separated from the limiting slot, solving the problem of poor fixing effect of the bottom slot paper. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the partial structure of the stator structure with stepped slots provided in the present application.

[0038] Figure 2 This application provides Figure 1 Cross-sectional view at AA in the middle.

[0039] Figure 3 This application provides Figure 2 An enlarged schematic diagram of the first embodiment at B in FIG.

[0040] Figure 4 This application provides Figure 2 An enlarged schematic diagram of the second embodiment at B in FIG.

[0041] Figure 5 This application provides Figure 2 An enlarged schematic diagram of the third embodiment at B in FIG.

[0042] Figure 6 It is a structural schematic diagram of a stator core with a stator structure having stepped slots provided in the present application.

[0043] Description of reference numerals: 1. stator core; 11. stator slot; 12. third positioning portion; 2. stator end plate; 21. limiting groove; 22. paperboard groove; 23. connecting hole; 24. recessed part; 25. threaded hole; 3. Fixing assembly; 31. Driving unit; 311. First positioning portion; 312. Second positioning portion; 313. Locking bolt; 314. Connecting piece; 32. Fixing piece; 4. Bottom slot paper; 41. Limiting hole. DETAILED DESCRIPTION

[0044] The following is combined with Figure 1-6 This application is described in further detail.

[0045] like Figure 1 to Figure 2 As shown, the embodiment of the present application discloses a stator structure with a stepped notch, including a stator core 1, a stator end plate 2 and a fixing assembly 3; The stator core 1 is provided with a stator slot 11, and the stator slot 11 is used to insert the bottom slot paper 4, and the stator end plates 2 are provided at the opposite ends of the stator core 1; Along the extension direction of the stator slot 11, the projection of the slot wall of the stator slot 11 falls within the projection of the stator end plate 2; A limiting groove 21 is provided on one side of the stator end plate 2 facing the stator core 1, and the limiting groove 21 is used for inserting the end of the bottom slot paper 4; The fixing assembly 3 is used to drive the bottom slot paper 4 to abut against the slot wall of the limiting slot 21 .

[0046] Specifically, the stator core 1 can be made of multiple silicon steel sheets stacked together. The stator end plate 2 can be made of high-temperature resistant plastic material. For example, PPS (Polyphenylene Sulfide) plastic. PPS plastic has excellent high-temperature resistance and can work stably for a long time in a high-temperature environment. It also has good insulation properties and can effectively isolate current. Furthermore, PPS plastic has high mechanical strength and rigidity, and good chemical stability, and can resist corrosion from many chemical substances.

[0047] There are multiple stator slots 11, and the multiple stator slots 11 are evenly spaced and distributed along the circumferential direction. The stator end plate 2 is provided with a cardboard slot 22 corresponding to the stator slot 11 one by one, and the cardboard slot 22 and the stator slot 11 have different slot shapes or sizes, so that a step is formed between the cardboard slot 22 and the stator slot 11, and the step can limit the bottom slot paper 4 located in the stator slot 11. Since the stator end plates 2 are provided at opposite ends of the stator core 1, the bottom slot paper 4 is restricted between the two stator end plates 2 to prevent the bottom slot paper 4 from moving.

[0048] The end of the bottom slot paper 4 located in the stator slot 11 can extend into the limiting slot 21 on the stator end plate 2. The limiting slot 21 can protect and limit the end of the bottom slot paper 4, further preventing the bottom slot paper 4 from moving or being damaged.

[0049] The fixing component 3 is used to make the bottom slot paper 4 abut against the slot wall of the limiting slot 21, on the one hand, to further fix the bottom slot paper 4; on the other hand, the bottom slot paper 4 abuts against the slot wall of the limiting slot 21, which can avoid interference between the bottom slot paper 4 and the stator winding.

[0050] The stator structure with stepped notches in this embodiment is designed such that the slot type or size of the paperboard slot 22 is inconsistent with that of the stator slot 11, so that the bottom slot paper 4 is restricted between the two stator end plates 2. The end of the bottom slot paper 4 extends into the limiting slot 21, thereby further limiting and fixing the bottom slot paper 4. The fixing component 3 can prevent the bottom slot paper 4 from being separated from the limiting slot 21, thereby solving the problem of poor fixing effect of the bottom slot paper 4.

[0051] like Figures 2 to 3 As shown, in some embodiments, a connecting hole 23 communicating with the limiting groove 21 is provided in the stator end plate 2. The fixing assembly 3 includes a driving unit 31 and a fixing member 32, and the driving unit 31 is connected to the fixing member 32.

[0052] The driving unit 31 is configured to move to drive the fixing member 32 to move, so that the fixing member 32 passes through the connecting hole 23 and enters the limiting groove 21 to fix the bottom groove paper 4.

[0053] Specifically, since the width of the limiting groove 21 is not large, by providing a connecting hole 23 connected to the limiting groove 21 , the fixing member 32 can enter the limiting groove 21 through the connecting hole 23 and fix the bottom slot paper 4 .

[0054] like Figure 2 and Figure 4 As shown, in some embodiments, the fixing member 32 is used to drive the bottom slot paper 4 to move to abut against the inner wall of the limiting groove 21 on the side away from the connecting hole 23, thereby completing the clamping and fixing of the bottom slot paper 4. The bottom slot paper 4 abuts against the inner wall of the limiting groove 21, reducing the probability of the bottom slot paper 4 interfering with the stator winding process.

[0055] like Figures 2 to 3 As shown, in other embodiments, a limiting hole 41 corresponding to the connecting hole 23 is provided on the bottom slot paper 4. After the fixing member 32 is inserted into the limiting slot 21, it can pass through the limiting hole 41 and abut against the side wall of the limiting slot 21 away from the connecting hole 23, thereby completing the limiting of the bottom slot paper 4.

[0056] like Figures 3 to 5 As shown, in some embodiments, a recessed portion 24 is provided on the side wall of the limiting groove 21 away from the communicating hole 23 , and the recessed portion 24 is used to abut against the fixing member 32 .

[0057] Specifically, when the bottom slot paper 4 is provided with a limiting hole 41, the fixing member 32 passes through the limiting hole 41 and abuts against the recessed portion 24. The fixing member 32 extends into the recessed portion 24, which can prevent the bottom slot paper 4 from being separated from between the fixing member 32 and the recessed portion 24.

[0058] When the bottom slot paper 4 is not provided with the limiting hole 41, the fixing member 32 drives the bottom slot paper 4 to move, so that the bottom slot paper 4 abuts against the recessed portion 24, thereby increasing the friction between the bottom slot paper 4 and the fixing member 32, and further preventing the bottom slot paper 4 from sliding.

[0059] like Figures 2 to 3 As shown, in some embodiments, the drive unit 31 is slidably connected to the stator end plate 2 .

[0060] A first positioning portion 311 is provided on the driving unit 31 , and a second positioning portion 312 is provided on the stator end plate 2 . The first positioning portion 311 and the second positioning portion 312 are limitedly matched.

[0061] Specifically, the driving unit 31 is slidably connected to a side of the stator end plate 2 away from the stator core 1. The sliding driving unit 31 can make the fixing member 32 pass into or out of the limiting groove 21.

[0062] The first positioning portion 311 can be a through hole, and the second positioning portion 312 can be a screw hole. When the fixing member 32 fixes the bottom slot paper 4, the first positioning portion 311 and the second positioning portion 312 are exactly coaxial, and a bolt can be passed through the first positioning portion 311 and threadedly connected with the second positioning portion 312, thereby locking the driving unit 31 to prevent the fixing member 32 from moving and causing the bottom slot paper 4 to move.

[0063] In this embodiment, the fixing member 32 may be a rubber pad. The rubber pad has a certain degree of deformability. When the fixing member 32 fixes the bottom slot paper 4, the fixing member 32 can ensure that the first positioning portion 311 and the second positioning portion 312 are coaxial by slightly deforming.

[0064] like Figures 4 to 5As shown, in other embodiments, the driving unit 31 includes a locking bolt 313 and a connecting member 314 ; the connecting member 314 is connected to the fixing member 32 .

[0065] The stator end plate 2 is provided with a threaded hole 25 parallel to the connecting hole 23 ; the locking bolt 313 is rotatably connected to the connecting piece 314 , and the locking bolt 313 is threadedly connected to the stator end plate 2 through the threaded hole 25 .

[0066] Specifically, by turning the locking bolt 313, the locking bolt 313 gradually enters or disengages from the threaded hole 25, the connecting piece 314 and the fixing piece 32 can move along the axial direction of the connecting hole 23, so that the fixing piece 32 can pass through the connecting hole 23 into or out of the limiting groove 21, and finally complete the fixing or release of the bottom slot paper 4.

[0067] In this embodiment, the fixing member 32 may include a rod body, which is coaxially arranged with the connecting hole 23. A flexible pad may be arranged at one end of the rod body, and the rod body abuts against the bottom groove paper 4 or the recessed portion 24 through the flexible pad. In addition, when the fixing member 32 moves, it only moves in translation, but not in rotation, so as to avoid damaging the bottom groove paper 4.

[0068] Furthermore, the directions of the communicating hole 23 and the limiting groove 21 may be perpendicular or non-perpendicular.

[0069] like Figure 4 As shown, when the connecting hole 23 is perpendicular to the limiting groove 21, the opening of the connecting hole 23 is relatively simple, and at this time the moving direction of the fixing member 32 is perpendicular to the bottom slot paper 4, so the fixing of the bottom slot paper 4 is relatively simple.

[0070] like Figure 5 As shown, when the connecting hole 23 is not perpendicular to the limiting groove 21 , the recessed portion 24 is located at the bottom of the limiting groove 21 , and the fixing member 32 is used to drive the end of the bottom groove paper 4 to bend to abut against the recessed portion 24 .

[0071] Specifically, the recessed portion 24 has at least one plane structure, and the fixing member 32 can push the end of the bottom slot paper 4 to bend to abut against the plane structure of the recessed portion 24. The bending of the bottom slot paper 4 can make it more difficult for the bottom slot paper 4 to slide. The bending angle of the end of the bottom slot paper 4 can be less than 90° or greater than 90°.

[0072] like Figure 5 As shown, when the bending angle of the end of the bottom slot paper 4 is less than 90°, the fixing member 32 can exert an inclined force on the bottom slot paper 4 in the process of pushing the end of the bottom slot paper 4 to bend, and the force can make the corresponding end of the bottom slot paper 4 tend to move away from the other end, thereby flattening the bottom slot paper 4 and avoiding the probability of the bottom slot paper 4 interfering with the stator winding process.

[0073] When the bending angle of the end of the bottom slot paper 4 is greater than 90°, the larger bending angle enables the fixing member 32 to have a stronger limiting effect on the bottom slot paper 4 .

[0074] like Figures 3 to 5 As shown, in some embodiments, the slot opening of the limiting slot 21 is expanded, so that the bottom slot paper 4 can be more easily inserted into the limiting slot 21, reducing the positioning accuracy requirements.

[0075] The side wall of the limiting groove 21 away from the connecting hole 23 is flush with the inner wall of the stator slot 11, so that when the bottom slot paper 4 abuts against the side wall of the limiting groove 21 away from the connecting hole 23, the bottom slot paper 4 can be as close to the inner wall of the stator slot 11 as possible.

[0076] like Figure 1 and Figure 6 As shown, in some embodiments, a positioning piece is provided on one of the stator end plate 2 and the stator core 1, and a third positioning portion 12 which cooperates with the positioning piece in a limiting manner is provided on the other.

[0077] Specifically, the positioning member may be a positioning column, which may be provided on the stator end plate 2. The third positioning portion 12 may be a positioning hole, which may be provided on the stator core 1.

[0078] By providing the positioning member and the third positioning portion 12, the stator end plate 2 can be quickly connected to the stator core 1. The connection method between the stator end plate 2 and the stator core 1 is not specifically limited, and can be, for example, a threaded connection.

Claims

1. A stator structure with stepped slots, characterized in that: It comprises: a stator core (1), a stator end plate (2) and a fixing assembly (3); The stator core (1) is provided with stator slots (11), the stator slots (11) being used for inserting bottom slot paper (4), and the stator end plates (2) are provided at opposite ends of the stator core (1); Along the extension direction of the stator slot (11), the projection of the slot wall of the stator slot (11) falls within the projection of the stator end plate (2); A limiting groove (21) is provided on one side of the stator end plate (2) facing the stator core (1), and the limiting groove (21) is used for inserting an end portion of the bottom slot paper (4); The fixing assembly (3) is used to drive the bottom slot paper (4) to abut against the slot wall of the limiting slot (21).

2. The stator structure with stepped notches according to claim 1, characterized in that: The stator end plate (2) is provided with a communication hole (23) in communication with the limiting groove (21); The fixing assembly (3) comprises a driving unit (31) and a fixing member (32), wherein the driving unit (31) is connected to the fixing member (32); The driving unit (31) is configured to be able to drive the fixing member (32) to move by moving, so that the fixing member (32) passes through the connecting hole (23) into the limiting groove (21) and fixes the bottom groove paper (4).

3. The stator structure with stepped notches according to claim 2, characterized in that: The fixing member (32) is used to drive the bottom slot paper (4) to move to abut against the inner wall of the limiting slot (21) on a side away from the connecting hole (23).

4. The stator structure with stepped slots according to claim 2, characterized in that: The bottom slot paper (4) is provided with a limiting hole (41) corresponding to the communicating hole (23), and the fixing member (32) is used to pass through the limiting hole (41) and abut against a side wall of the limiting slot (21) away from the communicating hole (23).

5. The stator structure with stepped slots according to claim 2, characterized in that: A recessed portion (24) is provided on the side wall of the limiting groove (21) away from the communicating hole (23), and the recessed portion (24) is used to abut against the fixing member (32).

6. The stator structure with stepped slots according to claim 2, characterized in that: The driving unit (31) is slidably connected to the stator end plate (2); The drive unit (31) is provided with a first positioning portion (311), the stator end plate (2) is provided with a second positioning portion (312), and the first positioning portion (311) and the second positioning portion (312) are limitedly matched.

7. The stator structure with stepped slots according to claim 2, characterized in that: The driving unit (31) comprises a locking bolt (313) and a connecting piece (314); The connecting member (314) is connected to the fixing member (32); The stator end plate (2) is provided with a threaded hole (25) parallel to the communication hole (23); The locking bolt (313) is rotatably connected to the connecting piece (314), and the locking bolt (313) is threadedly connected to the stator end plate (2) through the threaded hole (25).

8. The stator structure with stepped slots according to claim 5, characterized in that: The communicating hole (23) is not perpendicular to the limiting groove (21); the recessed portion (24) is located at the bottom of the limiting groove (21); the fixing member (32) is used to drive the end of the bottom groove paper (4) to bend until it abuts against the recessed portion (24); and the bending angle of the end of the bottom groove paper (4) is less than 90°.

9. The stator structure with stepped slots according to claim 2, characterized in that: The slot opening of the limiting slot (21) is expanded, and the side wall of the limiting slot (21) away from the connecting hole (23) is flush with the inner wall of the stator slot (11).

10. The stator structure with stepped slots according to claim 1, characterized in that: A positioning piece is provided on one of the stator end plate (2) and the stator core (1), and a third positioning portion (12) that cooperates with the positioning piece in a limiting manner is provided on the other.

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