Fractional-slot concentrated winding stator core

Abstract

This utility model discloses a fractional-slot concentrated winding stator core, comprising a plurality of stator slots distributed circumferentially. Some or all of the stator slots have stator slot steps at their upper and / or lower ends. The stator slot steps form end stator slots between themselves and the stator end faces at their respective ends, and form intermediate stator slots between themselves and the middle stator regions located at the non-end ends. The end stator slots and intermediate stator slots are coaxially aligned to form the stator slots, and the orthographic projection area of ​​the end stator slots is larger than that of the intermediate stator slots. This utility model achieves enhanced fitting and connection between the insulating end plates and the end stator slots. When the insulating paper is inserted into the stator slots, even if most of the tension force during coil winding is applied to the stator end corners, the insulating paper is not easily compressed or deformed, thus avoiding negative impacts on the electrical strength of the fractional-slot concentrated winding stator.

Description

Technical Field

[0001] This utility model belongs to the field of electric motors, and specifically relates to a fractional slot concentrated winding stator core. Background Technology

[0002] During the coil winding process (especially automatic machine winding), the tension force on the stator with fractional slot concentrated winding is mostly applied at the corners of the stator ends, which can easily cause compression and deformation of the insulating paper, resulting in a reduction in the electrical strength of the stator with fractional slot concentrated winding. In addition, since the stamped silicon steel sheets are relatively sharp, pressure will be generated at the ends, which can also easily cause damage to the insulating paper, which will also reduce its electrical strength to a certain extent.

[0003] Therefore, the applicant seeks technical solutions to improve the above-mentioned technical problems. Summary of the Invention

[0004] In view of this, the purpose of this utility model is to provide a fractional slot concentrated winding stator core to achieve a reinforced connection between the insulating end plate and the end stator slot; when the insulating paper is inserted into the stator slot, even if most of the tension force during coil winding is applied to the corner of the stator end, the insulating paper is not easily compressed and deformed, thus avoiding negative impact on the electrical strength of the fractional slot concentrated winding stator.

[0005] The technical solution of this utility model is as follows: A fractional-slot concentrated winding stator core includes a plurality of stator slots distributed circumferentially, wherein some or all of the stator slots have stator slot steps at their upper and / or lower ends, wherein... The stator slot step forms an end stator slot with the stator end face at its end, and forms an intermediate stator slot with the stator middle area located at the non-end. The end stator slots and the middle stator slots are coaxially aligned to form the stator slots, and the projected area of ​​the end stator slots is larger than that of the middle stator slots.

[0006] Preferably, it includes end stator laminations located at the upper end and / or lower end, and intermediate stator laminations located at non-end ends; the projected area of ​​the end stator laminations is smaller than the projected area of ​​the intermediate stator laminations. Several end stator laminations are stacked together to form the end stator slot; Several intermediate stator laminations are stacked together to form the intermediate stator slot.

[0007] Preferably, the outer diameter and inner diameter of the end stator lamination and the middle stator lamination are equal, and they are coaxially arranged.

[0008] A fractional-slot concentrated winding stator core, wherein some or all of the stator slots are provided with upper stator slot steps and lower stator slot steps at their upper and lower ends, respectively; wherein... The upper stator slot is formed between the upper stator slot step and the upper stator surface, and the lower stator slot is formed between the lower stator slot step and the lower stator surface. An intermediate stator slot is formed between the upper stator slot step and the lower stator slot step; The upper stator slot, the middle stator slot, and the lower stator slot are coaxially aligned to form the stator slot, and the projected area of ​​the upper stator slot and the orthographic projected area of ​​the lower stator slot are both larger than the orthographic projected area of ​​the middle stator slot.

[0009] Preferably, it includes an upper stator lamination and a lower stator lamination located at the upper end and lower end respectively, and an intermediate stator lamination located at a non-end; the projected area of ​​the upper stator lamination and the lower stator lamination is smaller than the projected area of ​​the intermediate stator lamination. Several upper stator laminations are stacked together to form the upper stator slot; Several intermediate stator laminations are stacked together to form the intermediate stator slot; Several lower stator laminations are stacked together to form the lower stator slot; Preferably, the outer diameter and inner diameter of the upper stator lamination, the middle stator lamination and the lower stator lamination are all equal and they are coaxially arranged.

[0010] Preferably, the projected area of ​​the upper stator slot is equal to the projected area of ​​the lower stator slot.

[0011] Preferably, insulating paper is inserted into each stator slot, and insulating end plates are respectively provided on the upper and lower end faces of the stator; wherein, the insulating end plate is provided with a fitting extension, which extends to the stator slot step at its end to achieve a fitting and enhanced connection.

[0012] Preferably, the insulating end plate is an injection-molded part.

[0013] Preferably, the depth of the stator slots at each end is 1-5 mm, and more preferably 1.5-3.5 mm.

[0014] This application proposes to provide an end stator slot structure at the end of the stator core (preferably at both ends) and the middle stator slot (as the main body of the stator slot), wherein the projected area of ​​the end stator slot is larger than that of the middle stator slot. In practical applications, the insulating end plate extends to the stator slot step at its end by setting a fitting extension, thereby achieving a fitting and enhanced connection between the insulating end plate and the end stator slot. When the insulating paper is inserted into the stator slot, even if most of the tension force during coil winding is applied at the stator end corner, the insulating paper is not easily compressed or deformed, thus avoiding negative impact on the electrical strength of the fractional slot concentrated winding stator. Based on the above structural scheme, since the end stator laminations in this application are located at the ends, their projected area is smaller than that of the middle stator laminations (which are the main laminations of the stator core), which significantly reduces the pressure damage to the insulating paper caused by the stator laminations at the ends. At the same time, since the end insulation structure is structurally reinforced, the electrical strength of the fractional slot concentrated winding stator is further protected from possible negative impacts. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the fractional slot concentrated winding stator core according to a specific embodiment of this application; Figure 2 yes Figure 1 Enlarged view of the structure at point A in the middle; Figure 3 yes Figure 1 A schematic diagram of the decomposed structure; Figure 4 yes Figure 3 Enlarged view of the structure at point B in the middle. Detailed Implementation

[0016] This utility model discloses a fractional-slot concentrated winding stator core, including a plurality of stator slots distributed circumferentially. Some or all of the stator slots have stator slot steps at their upper and / or lower ends. The stator slot step forms an end stator slot between itself and the stator end face at its end, and forms an intermediate stator slot between itself and the middle area of ​​the stator located at a non-end. The end stator slots and the intermediate stator slots are coaxially aligned to form stator slots, and the orthographic projection area of ​​the end stator slots is larger than that of the intermediate stator slots.

[0017] Preferably, this utility model embodiment also discloses a fractional-slot concentrated winding stator core, wherein some or all of the stator slots are provided with upper stator slot steps and lower stator slot steps at their upper and lower ends, respectively; wherein, the upper stator slot step and the upper end face of the stator form an upper stator slot, and the lower stator slot step and the lower end face of the stator form a lower stator slot; an intermediate stator slot is formed between the upper stator slot step and the lower stator slot step; the upper stator slot, the intermediate stator slot, and the lower stator slot are coaxially aligned to form stator slots, and the projected area of ​​the upper stator slot and the orthographic projected area of ​​the lower stator slot are both larger than the orthographic projected area of ​​the intermediate stator slot.

[0018] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0019] Please refer to the above. Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a fractional-slot concentrated winding stator core has upper stator slot steps 2 and lower stator slot steps (not shown, but the structure of the upper stator slot step 2 can be directly referred to; in this embodiment, all stator slots 1 are selected) at their upper and lower ends respectively. The upper stator slot 1a is formed between the upper stator slot step 2 and the upper stator surface 3, and the lower stator slot step is formed between the lower stator surface (not shown, but the structure of the upper stator surface 3 can be directly referred to; in this embodiment, the two are symmetrically distributed vertically). The upper stator slot 1a is formed between the upper stator slot 1a and the lower stator slot 1b. The upper stator slot 1a, the middle stator slot 1b, and the lower stator slot are coaxially aligned to form the stator slot 1. The projected area of ​​the upper stator slot 1a and the lower stator slot 1b are both larger than the projected area of ​​the middle stator slot 1b.

[0020] Preferably, in this embodiment, it includes an upper stator lamination 4 and a lower stator lamination located at the upper and lower ends, respectively, and an intermediate stator lamination 5 located at the non-ends; the projected area of ​​the upper stator lamination 4 and the lower stator lamination is smaller than the projected area of ​​the intermediate stator lamination 5; a plurality of upper stator laminations 4 are stacked together to form an upper stator slot 1a; a plurality of intermediate stator laminations 5 are stacked together to form an intermediate stator slot 1b; a plurality of lower stator laminations are stacked together to form a lower stator slot; in specific implementation, the number of stator laminations corresponding to the upper stator slot 1a, the intermediate stator slot 1b, and the lower stator slot can be selected according to the required slot depth. Preferably, in this embodiment, the outer diameter and inner diameter of the upper stator lamination 4, the middle stator lamination 5 and the lower stator lamination are all equal and are coaxially arranged; specifically, during processing, the upper stator lamination 4 and the lower stator lamination are blanked silicon steel sheets of the same specification, and the middle stator lamination 5 is a blanked silicon steel sheet of another specification. Preferably, in this embodiment, insulating paper 6 is inserted into each stator slot 1, and an upper insulating end plate 7 and a lower insulating end plate 8 are respectively provided on the upper and lower end faces of the stator; wherein, the insulating end plate 7 and the lower insulating end plate 8 are respectively provided with a fitting extension portion, wherein the fitting extension portion 7a of the upper insulating end plate 7 extends to the upper stator slot step 2, and the fitting extension portion 8a of the lower insulating end plate 8 extends to the lower stator slot step 2, thereby achieving a fitting and enhanced connection; specifically preferably, in this embodiment, both the upper insulating end plate 7 and the lower insulating end plate 8 are injection molded parts, and their corresponding fitting extension portions 7a and 8a (their shapes correspond to the shapes of the end stator slots respectively) extend integrally to the stator slot step at their respective ends, further facilitating the fitting and enhanced connection effect.

[0021] Preferably, in this embodiment, the groove depth of the upper stator groove 1a and the lower stator groove is 1-5mm, preferably 1.5-3.5mm; wherein, the groove depth of the upper stator groove 1a and the lower stator groove can be equal or unequal. In order to facilitate simple and efficient processing and forming, the applicant suggests setting the groove depth of the upper stator groove and the lower stator groove to be equal.

[0022] In practical application, the upper insulating end plate 7 and the lower insulating end plate 8 extend to the stator slot steps at their respective ends by setting a fitting extension portion, thereby achieving a fitting and enhanced connection between each insulating end plate and its corresponding end stator slot. When the insulating paper 6 is inserted into the stator slot 1, even if most of the tension force during coil winding is applied to the stator end corner, the insulating paper 6 is not easily compressed or deformed, thus avoiding negative impacts on the electrical strength of the fractional slot concentrated winding stator. At the same time, since the upper and lower end stator laminations in this embodiment are set at the upper and lower ends, their projected area is smaller than that of the middle stator lamination (which serves as the main lamination of the stator core), significantly reducing the pressure damage to the insulating paper 6 caused by the stator laminations at the upper and lower ends. Furthermore, since the end insulation structure is structurally reinforced, the electrical strength of the fractional slot concentrated winding stator is further protected from possible negative impacts, greatly ensuring the electrical strength performance of the fractional slot concentrated winding stator.

[0023] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0024] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A fractional-slot concentrated winding stator core, comprising a plurality of stator slots distributed circumferentially, characterized in that, Some or all of the stator slots have stator slot steps at their upper and / or lower ends, wherein, The stator slot step forms an end stator slot with the stator end face at its end, and forms an intermediate stator slot with the stator middle area located at the non-end. The end stator slots and the middle stator slots are coaxially aligned to form the stator slots, and the projected area of ​​the end stator slots is larger than that of the middle stator slots.

2. The fractional-slot concentrated winding stator core according to claim 1, characterized in that, It includes end stator laminations located at the upper and / or lower ends, and intermediate stator laminations located at non-end ends; the projected area of ​​the end stator laminations is smaller than the projected area of ​​the intermediate stator laminations. Several end stator laminations are stacked together to form the end stator slot; Several intermediate stator laminations are stacked together to form the intermediate stator slot.

3. The fractional-slot concentrated winding stator core according to claim 2, characterized in that, The outer and inner diameters of the end stator laminations and the intermediate stator laminations are equal, and they are coaxially arranged.

4. The fractional-slot concentrated winding stator core according to claim 1 or 2, characterized in that, Insulating paper is inserted into each stator slot, and insulating end plates are respectively provided on the upper and lower end faces of the stator; wherein, the insulating end plate is provided with a fitting extension, which extends to the stator slot step at its end to achieve a fitting and enhanced connection.

5. The fractional-slot concentrated winding stator core according to claim 4, characterized in that, The insulating end plate is an injection molded part.

6. The fractional-slot concentrated winding stator core according to claim 1 or 2, characterized in that, The depth of the stator slots at each end is 1-5mm.

7. The fractional-slot concentrated winding stator core according to claim 1 or 2, characterized in that, The depth of the stator slots at each end is 1.5-3.5mm.

8. A fractional-slot concentrated winding stator core, characterized in that, Some or all of the stator slots have upper stator slot steps and lower stator slot steps at their upper and lower ends, respectively; wherein, The upper stator slot is formed between the upper stator slot step and the upper stator surface, and the lower stator slot is formed between the lower stator slot step and the lower stator surface. An intermediate stator slot is formed between the upper stator slot step and the lower stator slot step; The upper stator slot, the middle stator slot, and the lower stator slot are coaxially aligned to form the stator slot, and the projected area of ​​the upper stator slot and the orthographic projected area of ​​the lower stator slot are both larger than the orthographic projected area of ​​the middle stator slot.

9. The fractional-slot concentrated winding stator core according to claim 8, characterized in that, It includes an upper stator lamination and a lower stator lamination located at the upper and lower ends, respectively, and an intermediate stator lamination located at the non-ends; the projected area of ​​the upper stator lamination and the lower stator lamination is smaller than the projected area of ​​the intermediate stator lamination. Several upper stator laminations are stacked together to form the upper stator slot; Several intermediate stator laminations are stacked together to form the intermediate stator slot; Several lower stator laminations are stacked together to form the lower stator slot.

10. The fractional-slot concentrated winding stator core according to claim 9, characterized in that, The outer and inner diameters of the upper stator lamination, the middle stator lamination, and the lower stator lamination are all equal and are coaxially arranged.

11. The fractional-slot concentrated winding stator core according to claim 8, characterized in that, The projected area of ​​the upper stator slot is equal to the projected area of ​​the lower stator slot.

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