Stator

Abstract

A stator comprises a stator core, a stator end plate and a winding, the stator core comprises stator teeth and stator slots, the stator end plate comprises a tooth part and a slot part, the tooth part comprises a winding part and an extension part, and insulation paper is installed in the stator slots and the slot part; a slot is formed between every two adjacent tooth parts, a slot wedge is installed in each slot in the axial direction, each tooth part is provided with a supporting structure abutting against insulation paper, the supporting structures are located on the end faces, facing the slots, of the extending parts, and each supporting structure is provided with a supporting face for supporting the insulation paper and a connecting part formed on the end side of the supporting face. And the thickness of the connecting part is gradually increased from one side, close to the stator core, of the stator end plate to one side, far away from the stator core, of the stator end plate. According to the arrangement, when the stator end plates are installed at the two axial ends of the stator iron core, the supporting structures open the insulation paper, and gaps are formed between the supporting structures and the extension parts, so that when the slot wedges are inserted into the slots, the slot wedges do not make contact with the insulation paper, and it is guaranteed that the insulation paper is located between the slot wedges and the windings.

Description

[Technical Field]

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

[0002] Brushless motors mainly consist of a stator, a rotor, and an electronic commutator (brushless motor controller). The electronic commutator replaces the original brushes for commutation, and has the advantages of high efficiency, long life and easy control. It is increasingly widely used in many fields such as power tools and portable electronic devices.

[0003] The stator of a brushless motor includes a stator core, stator end plates mounted to both ends of the stator core, and windings wound on the stator core and stator end plates. The windings need to be insulated from the stator core, so insulating paper needs to be inserted into the stator slots of the stator core and the slots of the stator end plates. The windings are wound on the insulating paper to achieve mutual insulation with the stator core. In addition, slot wedges need to be inserted between two adjacent stator teeth of the stator core for further insulation treatment, and the slot wedges can prevent the windings from coming off the stator core.

[0004] However, in the existing solution, the winding is wound on the stator core with insulating paper installed, and after the stator end plate is installed at both ends of the stator core, when the slot wedge is inserted, the slot wedge may push the insulating paper open, causing the slot wedge to be inserted between the insulating paper and the winding (normally, the insulating paper is located between the slot wedge and the winding). This can cause the slot wedge to rub against the enameled wire of the winding, resulting in the inability to achieve insulation and damage to the brushless motor.

[0005] Therefore, it is indeed necessary to provide an improved stator to overcome the shortcomings of the prior art. [Utility Model Content]

[0006] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a stator that positions and supports the insulating paper when installing the slot wedge.

[0007] The technical solution adopted by this utility model to solve the existing technical problems is as follows: a stator, including a stator core, a stator end plate fixed to the axial end of the stator core, and a winding wound on the stator core and the stator end plate. The stator core protrudes radially inward from its inner wall to form stator teeth, and a stator slot is formed between two adjacent stator teeth. The stator end plate includes tooth portions corresponding to the stator teeth and slot portions corresponding to the stator slots. The tooth portions include winding portions for winding and extensions protruding circumferentially from the winding portions to both sides. The extension portion has insulating paper installed into the stator slot and the slot portion; a slot is formed between two adjacent teeth, and a slot wedge is installed in the slot along the axial direction. The teeth are provided with a support structure that abuts against the insulating paper. The support structure is located on the end face of the extension portion facing the slot. The support structure has a support surface that supports the insulating paper and a connecting portion formed on the end side of the support surface. The thickness of the connecting portion gradually increases from the side of the stator end plate near the stator core toward the side of the stator end plate away from the stator core.

[0008] A further improvement is as follows: the toothed portion includes a stop portion located at the upper axial end of the support structure, the stop portion protruding from the extension portion, and the upper axial end of the insulating paper abutting against the lower axial end of the stop portion.

[0009] A further improvement is as follows: the slot is formed between the extension and the stop, the slot wedge is located radially inside the insulating paper, and the two ends of the insulating paper do not contact the slot wedge.

[0010] A further improvement is as follows: the stator end plates are provided in pairs, and the pair of stator end plates are respectively installed from both ends of the axial direction to the end of the stator core into which the insulating paper is inserted.

[0011] A further improvement is as follows: each of the teeth is provided with two extensions, and each extension is provided with a support structure; the shortest circumferential distance between two support structures located in the same groove is not greater than the circumferential dimension of the groove wedge.

[0012] A further improvement is that the extension, the stop, and the support structure are integrally injection molded.

[0013] Another technical solution adopted by this utility model to solve the problem of the prior art is: a stator, including a stator core, a stator end plate fixed to the axial end of the stator core, and a winding wound on the stator core and the stator end plate. The stator core extends radially inward from the inner wall to form stator teeth, and a stator slot is formed between two adjacent stator teeth. The stator end plate includes a tooth portion corresponding to the stator teeth and a slot portion corresponding to the stator slot. The tooth portion includes a winding portion for winding and an extension portion extending circumferentially from the winding portion to both sides. Insulating paper is installed to the stator slot and the slot portion. A slot is formed between two adjacent tooth portions. A slot wedge is installed in the slot along the axial direction. A support structure is provided between the slot and the winding portion. The axial end of the insulating paper is spaced apart from the slot wedge and forms a gap.

[0014] A further improvement is that the support structure has a connecting portion that communicates with the slot, and the thickness of the connecting portion gradually increases from the side of the stator end plate near the stator core toward the side of the stator end plate away from the stator core.

[0015] A further improvement is as follows: the toothed portion includes a stop portion located at the upper axial end of the support structure, the stop portion protruding from the extension portion, and the upper axial end of the insulating paper abutting against the lower axial end of the stop portion.

[0016] Another technical solution adopted by this utility model to solve the existing technical problems is: a stator, including a stator core, a stator end plate fixed to the axial end of the stator core, and a winding wound on the stator core and the stator end plate. The stator core extends radially inward from its inner wall to form stator teeth, and a stator slot is formed between two adjacent stator teeth. The stator end plate includes a tooth portion corresponding to the stator teeth and a slot portion corresponding to the stator slot. The tooth portion includes a winding portion for winding and an extension portion extending circumferentially from the winding portion to both sides. Insulating paper is installed to the stator slot and the slot portion. A slot is formed between two adjacent tooth portions. A slot wedge is installed in the slot along the axial direction. The tooth portion is provided with a support structure that abuts against the insulating paper. The support structure has a support surface for supporting the insulating paper. The support structure is located on the opposite side of the insertion direction of the slot wedge. Under the action of the support surface, the insulating paper is offset in a direction away from the slot.

[0017] Compared with the prior art, this utility model has the following advantages: a slot is formed between two adjacent teeth, a slot wedge is installed in the slot along the axial direction, the teeth are provided with a support structure that abuts against the insulating paper, the support structure is located on the end face of the extension facing the slot, the support structure has a support surface for supporting the insulating paper and a connecting part formed on the end side of the support surface, the thickness of the connecting part gradually increases from the side of the stator end plate near the stator core toward the side of the stator end plate away from the stator core. With this configuration, when the stator end plate is installed to both ends of the stator core along the axial direction, the support structure opens the insulating paper and creates a gap between it and the extension, so that when the slot wedge is inserted into the slot, the slot wedge will not come into contact with the insulating paper, ensuring that the insulating paper is between the slot wedge and the winding. [Image Description]

[0018] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings:

[0019] Figure 1 This is a three-dimensional schematic diagram of the stator of a preferred embodiment of the present invention;

[0020] Figure 2 yes Figure 1 A three-dimensional schematic diagram of the stator from another angle;

[0021] Figure 3 yes Figure 2 The exploded view of the stator is shown below;

[0022] Figure 4 yes Figure 3 A three-dimensional schematic diagram of a portion of the stator structure is shown.

[0023] Figure 5 yes Figure 4 A three-dimensional schematic diagram of the stator end plate shown;

[0024] Figure 6 yes Figure 5 A partially enlarged view of the stator end plate of the stator shown. [Detailed Implementation]

[0025] The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. For example, terms such as "upper," "lower," "front," and "rear" that indicate orientation or positional relationship are based solely on the orientation or positional relationship shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device / component referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0026] Please see Figures 1 to 6The image shows a stator 100 according to this utility model. The stator 100 is installed on a brushless motor and drives the rotor to rotate through electromagnetic induction, which in turn drives the output shaft to rotate and drives the tool to work.

[0027] Please see Figures 1 to 3 As shown, the stator 100 includes a stator core 1, a stator end plate 2 fixed to the end of the stator core 1, and a winding 3 wound on the stator core 1 and the stator end plate 2. Multiple windings 3 are provided, and multiple windings 3 are connected in parallel in a star connection to form a whole. The tail ends of the windings 3 are connected together to form a neutral point, and the three beginning ends of the windings 3 are respectively connected to the three phases of the external power supply.

[0028] The stator core 1 extends radially inward from its inner wall to form stator teeth 10, and stator slots 11 are formed between adjacent stator teeth. The stator end plate 2 includes tooth portions 20 corresponding to the stator teeth 10 and slot portions 21 corresponding to the stator slots 11. Insulating paper 4 is installed in the stator slots 11 and slot portions 21. Further, the tooth portion 20 includes a winding portion 201 for winding the winding 3 and extension portions 202 extending circumferentially from the winding portion to both sides.

[0029] Please combine Figures 4 to 6 As shown, a slot 205 is formed between two adjacent teeth 20. The slot wedge 5 is inserted into the slot 205 along the axial direction. Support structures 203 are provided on both sides of the slot 205 to abut against the sidewalls of the insulating paper 4. The support structure 203 is located on the end face of the extension 202 facing the slot 205. The support structure 203 protrudes from the inner wall of the extension 202. The upper axial end of the insulating paper 4 abuts against the sidewall of the support structure 203 so that there is a gap between the upper axial end of the insulating paper 4 and the slot wedge 5, that is, the sidewall of the upper axial end of the insulating paper 4 does not contact the sidewall of the slot wedge 5.

[0030] The support structure 203 has a support surface (not shown) for supporting the insulating paper 4 and a connecting portion 206 formed on the end side of the support surface. The connecting portion 206 is located on both sides of the slot wedge 5, and the connecting portion 206 is the part of the support structure 203 that is close to the slot wedge 5. The thickness of the connecting portion 206 gradually changes in the axial direction, from the side of the stator end plate 2 that is close to the stator core 1 to the side of the stator end plate 2 that is away from the stator core 1, the thickness of the connecting portion 206 gradually increases. After the winding 3 is wound on the stator core 1 on which the insulating paper 4 is installed, the stator end plate 2 is installed axially to the axial end face of the stator core 1. When the axial end of the insulating paper 4 contacts the support structure 203, it moves along the wall of the support structure 203, so that the end of the insulating paper 4 does not contact the extension 202 of the tooth 20. As a result, when the slot wedge 5 is inserted into the slot 205 after the stator end plate 2 is installed on the stator core 1, the end of the insulating paper 4 is located on the radial outside of the slot 205. At this time, the slot wedge 5 will not touch the end of the insulating paper 4, which would cause the slot wedge 5 to squeeze the insulating paper 4 to the radial inside of the slot wedge 5, that is, the slot wedge 5 will not be located between the insulating paper 4 and the winding 3.

[0031] In this embodiment, by setting the support structure 203 to make a gap between the axial end of the insulating paper 4 and the slot wedge 5, the insulating paper 4 can be in the correct position when the slot wedge 5 is inserted, that is, between the slot wedge 5 and the winding 3, thus ensuring the insulation effect of the insulating paper 4; and preventing the slot wedge 5 from being inserted between the insulating paper 4 and the winding 3, which would cause the slot wedge 5 to rub against the enameled wire of the winding 3 and affect the normal use of the brushless motor.

[0032] Furthermore, the tooth 20 includes a stop 204 located at the upper axial end of the support structure 203. The stop 204 protrudes from the extension 202, and the slot 205 is formed between the extension 202 and the stop 204. The upper axial end of the insulating paper 4 abuts against the lower axial end of the stop 204 to achieve axial positioning.

[0033] In this embodiment, a pair of stator end plates 2 are provided, and the pair of stator end plates 2 are respectively installed on both ends of the stator core 1; each tooth 20 includes two extensions 202, and each extension 202 is provided with a support structure 203. The shortest circumferential distance between the two support structures 203 located in the same slot 21 is not greater than the axial dimension of the slot wedge; each part on the stator end plate 2 is integrally formed by injection molding.

[0034] This utility model is not limited to the specific embodiments described above. Those skilled in the art will readily understand that many alternative solutions exist for the stator of this utility model without departing from its principles and scope. The scope of protection of this utility model is determined by the claims.

Claims

1. A stator, comprising a stator core, a stator end plate fixed to the axial end of the stator core, and a winding wound on the stator core and the stator end plate, wherein the stator core extends radially inward from its inner wall to form stator teeth and stator slots are formed between adjacent stator teeth, the stator end plate includes tooth portions corresponding to the stator teeth and slot portions corresponding to the stator slots, the tooth portions including winding portions for winding and extension portions extending circumferentially from the winding portions to both sides, and insulating paper is installed on the stator slots and the slot portions; characterized in that: A slot is formed between two adjacent teeth, and a slot wedge is installed in the slot along the axial direction. The teeth are provided with a support structure that abuts against the insulating paper. The support structure is located on the end face of the extension facing the slot. The support structure has a support surface that supports the insulating paper and a connecting portion formed on the end side of the support surface. The thickness of the connecting portion gradually increases from the side of the stator end plate near the stator core toward the side of the stator end plate away from the stator core.

2. The stator according to claim 1, characterized in that: The toothed portion includes a stop portion located at the axial upper end of the support structure, the stop portion protruding from the extension portion, and the axial upper end of the insulating paper abutting against the axial lower end of the stop portion.

3. The stator according to claim 2, characterized in that: The slot is formed between the extension and the stop, the slot wedge is located radially inside the insulating paper, and the two ends of the insulating paper do not contact the slot wedge.

4. The stator according to claim 1, characterized in that: The stator end plates are provided in pairs, and the pair of stator end plates are respectively installed from both ends of the axial direction to the end of the stator core into which the insulating paper is inserted.

5. The stator according to claim 3, characterized in that: Each of the teeth is provided with two extensions, and each extension is provided with a support structure; the shortest circumferential distance between two support structures located in the same groove is not greater than the circumferential dimension of the groove wedge.

6. The stator according to claim 2, characterized in that: The extension, the stop, and the support structure are integrally injection molded.

7. A stator, comprising a stator core, a stator end plate fixed to the axial end of the stator core, and a winding wound on the stator core and the stator end plate, wherein the stator core extends radially inward from its inner wall to form stator teeth and stator slots are formed between adjacent stator teeth, the stator end plate includes tooth portions corresponding to the stator teeth and slot portions corresponding to the stator slots, the tooth portions including winding portions for winding and extension portions extending circumferentially from the winding portions to both sides, and insulating paper is installed on the stator slots and the slot portions; characterized in that: A slot is formed between two adjacent teeth, a slot wedge is installed in the slot along the axial direction, a support structure is provided between the slot and the winding part, and the axial end of the insulating paper is spaced apart from the slot wedge and a gap is formed.

8. The stator according to claim 7, characterized in that: The support structure has a connecting portion that communicates with the slot, and the thickness of the connecting portion gradually increases from the side of the stator end plate near the stator core toward the side of the stator end plate away from the stator core.

9. The stator according to claim 8, characterized in that: The toothed portion includes a stop portion located at the axial upper end of the support structure, the stop portion protruding from the extension portion, and the axial upper end of the insulating paper abutting against the axial lower end of the stop portion.

10. A stator, comprising a stator core, a stator end plate fixed to the axial end of the stator core, and a winding wound on the stator core and the stator end plate, wherein the stator core extends radially inward from its inner wall to form stator teeth and stator slots are formed between adjacent stator teeth, the stator end plate includes tooth portions corresponding to the stator teeth and slot portions corresponding to the stator slots, the tooth portions including winding portions for winding and extension portions extending circumferentially from the winding portions to both sides, and insulating paper is installed on the stator slots and the slot portions; characterized in that: A slot is formed between two adjacent teeth, and a slot wedge is installed in the slot along the axial direction. The teeth are provided with a support structure that abuts against the insulating paper. The support structure has a support surface that supports the insulating paper. The support structure is located on the opposite side of the insertion direction of the slot wedge. Under the action of the support surface, the insulating paper is offset in a direction away from the slot.

Images