Stator core, stator, electric machine, vehicle, and method for producing stator core

Abstract

The invention discloses a stator iron core, a stator, a motor, a vehicle and a method for producing the stator iron core. The stator iron core comprises an iron core main body, the stator grooves are formed in the inner wall of the iron core main body and extend in the axial direction of the iron core main body, and the stator grooves are formed in the circumferential direction of the iron core main body at intervals; the clamping strips are fixed to the inner walls of the stator grooves in a protruding mode, the clamping strips extend in the axial direction of the iron core body, the clamping strips are arranged on the inner walls of the stator grooves, and the clamping strips are used for abutting against windings arranged in the stator grooves so that cooling flow channels can be formed between the windings and the stator grooves. According to the stator core, the cooling medium can be in direct contact with the winding, and the cooling effect is improved.

Description

Technical Field

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

[0002] During the operation of a motor, the stator slots, as the core part of the motor, their temperature control has an important impact on the performance and lifespan of the motor.

[0003] For example, in the prior art, an oil passage is often formed between the iron core and the insulating bushing to cool the stator slots. However, in this cooling method, the cooling medium cannot directly contact the winding, and there is room for further improvement in the cooling effect.

[0004] Therefore, there is a need to design a stator core, a stator, a motor, a vehicle, and a method for manufacturing a stator core to improve the cooling effect of the stator slots. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a stator core, a stator, a motor, a vehicle, and a method for manufacturing a stator core. The stator core can form a cooling flow channel with the winding, and the cooling medium can directly contact the surface of the winding to achieve cooling within the stator slots.

[0006] According to a first aspect of the present invention, there is provided a stator core, comprising:

[0007] A core body,

[0008] Stator slots arranged on the inner wall of the core body and extending along the axial direction of the core body. The stator slots are multiple and are spaced apart circumferentially on the core body.

[0009] Clamping strips protruding and fixed on the inner walls of the stator slots. The clamping strips extend along the axial direction of the core body and are used to be in contact with the windings arranged in the stator slots in a butting manner, so as to form a cooling flow channel between the windings and the stator slots.

[0010] In one embodiment, the clamping strip is a rubber vulcanized strip formed by a vulcanization process.

[0011] In one embodiment, mounting grooves extending along the axial direction of the core body are arranged on the inner walls of the stator slots, and part of the rubber vulcanized strip is fitted and fixed into the mounting grooves.

[0012] In one embodiment, the opening of the mounting groove is constricted relative to the inside of the mounting groove.

[0013] In one embodiment, the clamping strips on the two side walls of each stator slot that are oppositely arranged in the circumferential direction of the iron core body are arranged in a paired matching manner.

[0014] In one embodiment, the radial cross-sectional shape of the clamping strip is circular.

[0015] According to a second aspect of the present invention, there is provided a stator, comprising:

[0016] The above-mentioned stator core,

[0017] A sealing plate arranged on the inner wall of the iron core body for sealing the radial opening of the stator slot,

[0018] A winding arranged in the stator slot, and the winding is in pressure contact with the clamping strip to form a cooling flow path that penetrates axially along the iron core body in the stator slot.

[0019] According to a third aspect of the present invention, there is provided an electric motor, comprising the above-mentioned stator.

[0020] According to a fourth aspect of the present invention, there is provided a vehicle, comprising the above-mentioned electric motor.

[0021] According to a fifth aspect of the present invention, there is provided a method for manufacturing a stator core, comprising:

[0022] S01, machining an installation groove on the inner wall of the stator slot;

[0023] S02, setting a profiling tooling into the stator slot, and a mating groove that matches the installation groove one by one is arranged on the outer wall of the profiling tooling;

[0024] S03, forming the clamping strip at the installation groove and the mating groove through a vulcanization process.

[0025] Adopting the above technical solutions, the following beneficial effects are achieved: By arranging the clamping strip on the inner wall of the stator slot, after the winding is installed in the stator slot, since the clamping strip is arranged in a protruding manner relative to the inner wall of the stator slot, a gap will be formed between the winding and the inner wall of the stator slot, and this gap can be used as a cooling flow path for the cooling medium to flow through. It can be seen that through the stator core of the present application, the cooling medium can directly pass through the stator slot and directly contact the winding, effectively taking away the heat of the winding and the stator slot, cooling and reducing the temperature of the stator, and having a better cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Referring to the drawings, the disclosure of the present invention will become easier to understand. It should be understood that these drawings are only for illustrative purposes and are not intended to limit the protection scope of the present invention. In the drawings:

[0027] Figure 1 Shows a three - dimensional view of a stator according to an embodiment of the present invention;

[0028] Figure 2 Shows a partial stator slot in the stator core of an embodiment of the present invention where no clamping strip is provided;

[0029] Figure 3 Shows a stator slot in the stator core of an embodiment of the present invention where a profiling tooling is provided;

[0030] Figure 4 Shows a partial stator slot in the stator core of an embodiment of the present invention where a clamping strip is provided;

[0031] Figure 5 Shows a stator slot of a stator according to an embodiment of the present invention;

[0032] Figure 6 Shows a flowchart of a method for manufacturing a stator core according to an embodiment of the present invention.

[0033] In the drawings, the same components are denoted by the same reference numerals. The drawings are not drawn to actual scale. Detailed Embodiments

[0034] The following further describes the detailed embodiments of the present invention with reference to the drawings.

[0035] An embodiment of the present invention provides a stator core. As Figures 1 to 5 shown, the stator core 1 includes a core body 11, stator slots 12, and clamping strips 13. The core body 11 is in a cylindrical shape by itself. The stator slots 12 are provided on the inner wall of the core body 11 and extend along the axial direction of the core body 11. There are multiple stator slots 12, which are spaced apart circumferentially on the core body 11. The clamping strips 13 are fixedly provided on the inner wall of the stator slots 12 in a protruding manner. The clamping strips 13 extend along the axial direction of the core body 11.

[0036] During use, the winding 2 is arranged in the stator slots 12. Since the clamping strips 13 protrude from the inner wall of the stator slots 12, the winding 2 abuts against the clamping strips 13, so as to form a gap between the winding 2 and the inner wall of the stator slots 12. This gap can serve as a cooling channel 3 for the cooling medium to pass through. It can be seen that with the stator core 1 of the present application, the cooling medium can directly contact the winding 2, improving the cooling effect. In addition, the clamping strips 13 themselves can be elastic clamping strips, which can deform to form a pressure - type abutment during the abutment with the winding 2, so as to ensure the connection stability of the winding 2 in the stator slots 12 and contribute to the long - term operation of the stator.

[0037] In one embodiment, the clamping strip 13 is a rubber vulcanized strip formed by a vulcanization process. It can be seen that the clamping strip 13 is made of rubber material, taking advantage of the low cost and excellent performance of the rubber material. In particular, the rubber material not only has good elasticity to ensure a stable clamping force on the winding 2, but also can play a certain sealing role to separate different cooling channels 3 to ensure the direction of the cooling medium flow. The clamping strip 13 set by the vulcanization process has stable physical and chemical properties, better wear resistance, as well as better strength and elasticity. In particular, this processing operation has mature technology and is easy to implement. In addition, the clamping strip 13 can be used for a long time under high temperature conditions, reducing the risk of high-temperature failure and increasing the service life.

[0038] Installation grooves 14 are provided on the inner wall of the stator slots 12. Each installation groove 14 extends along the axial direction of the iron core body 11. A part of the rubber vulcanized strip is fittingly embedded and fixed in the installation groove 14. By providing the installation grooves 14, a positioning and installation basis is provided for the rubber vulcanized strip, and this setting can effectively ensure the connection stability between the rubber vulcanized strip and the iron core body 11. Preferably, the opening of the installation groove 14 is a reduced opening relative to the inside of the installation groove 14. This setting can ensure the connection stability of the rubber vulcanized strip in the installation groove 14 and effectively prevent the rubber vulcanized strip from coming out of the installation groove 14. For example, when the radial cross-section of the installation groove 14 is an arc groove, the opening size of the installation groove 14 is smaller than the diameter of the circle where the installation groove 14 is located, and the central angle of the arc where the installation groove 14 is located is greater than 180 degrees. During the production process, after the mating grooves 51 on the profiling tooling 5 correspond to the installation grooves 14 one by one, the cross-section is circular, the part where the installation groove 14 is located is a major arc, and the part where the mating groove 51 is located is a minor arc.

[0039] The clamping strips 13 on the two side walls of each stator slot 12 that are oppositely arranged in the circumferential direction of the iron core body 11 are arranged in a paired and matching manner. That is, in the figure, the clamping strips 13 on the left and right side walls of each stator slot 12 are arranged in a one-to-one opposite manner, and the two oppositely arranged clamping strips 13 are defined as a pair. The above setting enables the clamping strips 13 to clamp the winding 2 on both sides simultaneously, helping to form a stable clamping force on the winding 2 and ensuring the stability of the winding 2. At the same time, the above setting can also help to form relatively uniform cooling channels 3 to ensure cooling uniformity and improve the cooling effect. For a winding 2, a pair of clamping strips 13 can be set to clamp the winding 2. This setting can effectively ensure that there is a cooling channel 3 around each winding 2 separated from other channels, thereby ensuring the cooling sufficiency of the winding 2. Of course, the present application is not limited to the above setting. For example, two sets of clamping strips 13 can also be fittingly arranged on the same winding 2. In addition, a clamping strip 13 can also be provided at the bottom wall of the stator slot 12 to abut against the radially outermost winding 2 to further separate the cooling channels 3 and improve the cooling effect.

[0040] In one embodiment, the radial cross-sectional shape of the clamping strip 13 is circular. This structure is simple, easy to implement, and has stable mechanical properties. It can be understood that the shape of the clamping strip 13 is not limited to the above structural form. For example, the radial cross-sectional shape of the clamping strip 13 can also be configured as a triangle, an ellipse, or other shapes. It is easy to understand that when the radial cross-section of the clamping strip 13 is triangular, in order to ensure the stability of the clamping strip 13 in the installation groove 14 and prevent it from coming out, one corner of the triangle protrudes from the inner wall of the installation groove 14, and two corners of the triangle are located inside the installation groove 14.

[0041] This application also relates to a stator. As Figure 1 and 5 shown, the stator includes a stator core 1, a sealing plate 4, and windings 2. Among them, the sealing plate 4 is arranged on the inner wall of the iron core main body 11 for sealing the radial opening of the stator slot 12. Preferably, the sealing plates 4 of all the stator slots 12 are connected to form an integral cylindrical isolation bushing. This isolation bushing is sleeved on the inner wall of the stator core 1 and can seal the radial inner opening of the stator slot 12 to prevent the cooling medium from entering the air gap between the stator and the rotor when flowing in the stator slot 12. Preferably, the material of this isolation bushing can be rubber or carbon fiber, etc. After installation, at least the axial ends of this isolation bushing are flush with the axial end faces of the iron core main body 11, or can slightly protrude from the axial end faces of the iron core main body 11 to ensure that the cooling medium will not leak into the air gap between the stator and the rotor. The windings 2 are arranged in the stator slots 12. According to needs, there can be multiple windings 2. At the same time, the windings 2 are in pressure contact with the clamping strips 13. On the one hand, the clamping strips 13 form a clamping force on the windings 2 to ensure the installation stability of the windings 2 in the stator slots 12; on the other hand, the clamping strips 13 cooperate with the windings to separate the inner space of the stator slots 12 to form a cooling flow channel 3 that runs through axially along the iron core main body 11 in the stator slots 12. In a specific example, one winding 2 can correspond to a pair of clamping strips 13. Of course, it should be noted that the winding 2 located on the outermost side in the radial direction also has an additional clamping strip 13 in contact.

[0042] During use, the cooling medium enters the stator slots 12 from one axial end of the stator. Under the separation effect of the clamping strips 13, the cooling medium flows along different cooling flow channels 3, directly contacting all the windings 2 in the stator slots 12 to ensure the cooling effect. In addition, the cooling medium flowing in the stator slots 12 also plays a good cooling role on the stator core 1.

[0043] This application also relates to a motor and a vehicle. Among them, the motor includes the above-mentioned stator. And the vehicle includes the above-mentioned motor.

[0044] This application also relates to a method for manufacturing the above-mentioned stator core 1. As Figure 6As shown, first, perform step S01, the preparatory work. Process the installation groove 14 on the inner wall of the stator slot 12, as Figure 2 shown. To improve production efficiency, the installation grooves 14 on different stator slots 12 are distributed identically. Then, perform step S02. Set the profiling tooling 5 into the stator slot 12. The outer shape of the profiling tooling 5 matches the outer shape of the stator slot 12 and is columnar. A mating groove 51 is provided on the outer wall of the profiling tooling 5. The number and position of the mating groove 51 are matched with the installation groove 14. That is, the installation groove 14 corresponds to the mating groove 51 one by one to form the shape of the clamping strip 13. When the radial cross-section of the clamping strip 13 is circular, the installation groove 14 and the corresponding mating groove 51 form a hole with a circular cross-section. Finally, perform step S03. Form the clamping strip 13 at the installation groove 14 and the mating groove 51 through the vulcanization process. The vulcanization process is utilized in this method, with simple processing and high efficiency, which can ensure the formation of a stable clamping strip 13 on the inner wall of the stator slot 12. Moreover, in this method, the tooling is simple and the manufacturing cost is low.

[0045] In this application, under the clamping action of the clamping strip 13, the winding 2 is fixed in the stator slot 12, raising the overall height of the stator and improving NVH. A gap is formed between the winding 2 and the stator slot 12, and then a cooling channel 3 is formed to provide a flow channel for the cooling medium in the slot. The cooling medium can be in direct contact with the winding 2 to take away the heat generated by the winding 2 and improve the heat dissipation efficiency. Thus, under the condition of the same volume and using the same heat-resistant grade materials, the power and torque of the motor in this application can be significantly increased relatively. And under the condition of the same power and torque requirements, this application can reduce the motor volume or lower the heat-resistant grade of the materials, saving costs.

[0046] In the description of the present invention, it should be noted that unless otherwise specified, the meaning of "a plurality of" is two or more; the terms "inner" and "outer" respectively refer to the directions towards or away from the geometric center of a specific component.

[0047] The above are only the principles and preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, based on the principles of the present invention, several other variants can also be made, which should also be regarded as the protection scope of the present invention.

Claims

1. A stator core, characterized in that, Comprising: A core body, Stator slots arranged on the inner wall of the core body and extending along the axial direction of the core body, with a plurality of the stator slots being spaced circumferentially on the core body, Clamping strips protruding and fixed on the inner walls of the stator slots, the clamping strips extending along the axial direction of the core body, and the clamping strips being configured to abut against a winding arranged in the stator slots to form a cooling flow channel between the winding and the stator slots.

2. The stator core according to claim 1, wherein The clamping strips are rubber vulcanized strips formed by a vulcanization process.

3. The stator core according to claim 2, wherein Installation grooves extending along the axial direction of the core body are arranged on the inner wall of the stator slots, and a part of the rubber vulcanized strips is fitted and fixed into the installation grooves.

4. The stator core according to claim 3, characterized in that, The opening of the installation groove is constricted relative to the inside of the installation groove.

5. The stator core according to any one of claims 1 to 4, characterized in that, The clamping strips on the two opposite side walls of each stator slot arranged circumferentially on the core body are arranged in pairs and matched.

6. The stator core according to any one of claims 1 to 4, characterized in that The radial cross-sectional shape of the clamping strip is circular.

7. A stator, characterized in that, Comprising: The stator core according to any one of claims 1 to 6, A sealing plate arranged on the inner wall of the core body for sealing the radial opening of the stator slot, A winding arranged in the stator slot, and the winding is in pressure contact with the clamping strip to form a cooling flow channel penetrating axially along the core body in the stator slot.

8. A motor, characterized in that, Comprising the stator according to claim 7.

9. A vehicle, characterized in that, Comprising the motor according to claim 8.

10. A method for manufacturing a stator core for manufacturing a stator core according to any one of claims 1 to 6, characterized in that, Comprising: S01, machining installation grooves on the inner wall of the stator slots; S02, arranging a profiling tooling in the stator slots, and a mating groove matching the installation groove one by one is arranged on the outer wall of the profiling tooling; S03, forming the clamping strips at the installation grooves and the mating grooves by a vulcanization process.

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