Stator assembly, motor and vehicle

Abstract

The utility model discloses a stator assembly, a motor and a vehicle, the stator assembly comprises a stator, the inner wall of the stator is provided with a stator groove which extends along the axial direction of the stator, the outer wall of the stator is provided with an oil cavity groove which extends along the circumferential direction of the stator and is used for forming a first oil cavity, and the oil cavity groove is used for forming a second oil cavity. The stator is provided with second oil cavities distributed in the circumferential direction, the second oil cavities are communicated with the oil cavity grooves through first flow channels, the two ends, in the axial direction of the stator, of each second oil cavity are provided with second flow channels extending in the axial direction of the stator, and the second flow channels are located on the groove walls of the stator grooves. And one end of the second flow channel is communicated with the second oil cavity, and the other end of the second flow channel extends to the shaft end surface of the stator, so that a winding in a stator slot can be well cooled through the second flow channel.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage, and in particular to a stator assembly, a motor and a vehicle. Background Art

[0002] Motors are electrical devices widely used in industry and daily life, such as the automotive industry. During the operation of the motor, the heat generated by the stator is one of the important factors affecting the performance of the motor. Stator cooling technology is one of the key technologies for motor operation and has an important impact on the efficiency and life of the motor.

[0003] Existing stator cooling technologies mainly include air cooling, water cooling and oil cooling. Air cooling is achieved by installing heat sinks or fans on the outside of the stator to force air through the heat sinks or fans to take away the heat. Water cooling requires a dedicated water jacket, and the cooling water is far away from the windings, with a temperature gradient in between, resulting in a weak cooling effect. Oil-cooled motors mostly use oil guide rings to drain cooling oil to cool the windings and stator core. It can be seen that these cooling methods cannot directly cool the windings in the stator slots, and the cooling and heat dissipation effects still need to be further improved.

[0004] Therefore, the utility model proposes a stator assembly, a motor and a vehicle for enabling a cooling medium to directly cool the windings in the stator slots, thereby improving the cooling and heat dissipation effect. Utility Model Content

[0005] The utility model aims to overcome the deficiencies of the prior art and to provide a stator assembly, a motor and a vehicle. In the stator assembly, the cooling medium can be shunted to both axial ends of the stator for cooling at the same time, thereby reducing the temperature generated by the winding when the motor is running and improving the cooling effect.

[0006] According to a first aspect of the utility model, a stator assembly is provided, including a stator, wherein a stator slot extending along the axial direction of the stator is provided on the inner wall of the stator, an oil cavity slot extending along the circumferential direction of the stator is provided on the outer wall of the stator to form a first oil cavity, a second oil cavity distributed along the circumferential direction of the stator is provided on the stator, the second oil cavity is connected to the oil cavity slot through a first flow channel, and second flow channels extending along the axial direction of the stator are provided at both ends of the second oil cavity along the axial direction of the stator, the second flow channel is located at the slot wall of the stator slot, one end of the second flow channel is connected to the second oil cavity and the other end extends to the axial end face of the stator.

[0007] In one embodiment, insulating bushings are respectively provided at both axial ends of the stator, each of the insulating bushings includes an elastic bushing sleeve for close-fitting insertion into the stator slot, a convex portion is provided on the elastic bushing sleeve, and the elastic bushing sleeve and the stator slot are spaced apart at the convex portion to form the second flow channel.

[0008] In one embodiment, the protrusions on each of the elastic bushings are distributed in a one-to-one correspondence on two walls of the elastic bushing in the circumferential direction of the stator.

[0009] In one embodiment, the insulating bushing further comprises a bushing body in the shape of an annular disk fixedly connected to the elastic bushing sleeve, the bushing body abuts against the axial end surface of the stator, and the elastic bushing sleeve penetrates the bushing body in the axial direction of the stator.

[0010] In one embodiment, an upper oil baffle plate and a lower oil baffle plate are provided on the end surface of the bushing body axially away from the stator, the upper oil baffle plate is provided on the vertical upper side of the stator and is located on the inner side of the stator slot in the radial direction of the stator, while the lower oil baffle plate is provided on the vertical lower side of the stator and is located on the outer side of the stator slot in the radial direction of the stator, and an oil return port is provided on the lower oil baffle plate at the lowest position in the vertical direction of the stator.

[0011] In one embodiment, the upper oil baffle plate and the lower oil baffle plate are both distributed in at least a semicircular manner in the circumferential direction of the bushing body and are symmetrical about the vertical center of the bushing body.

[0012] In one embodiment, the stator includes a first stator component and a second stator component arranged at two axial ends of the first stator component, wherein the outer diameter of the first stator component is smaller than the outer diameter of the second stator component to form the oil chamber groove at the first stator component, a radially extending first hole is arranged on the first stator component to form the first flow channel, and a sealing plate is arranged on the inner wall of the first stator component to seal the stator groove arranged on the first stator component to form the second oil chamber.

[0013] In one embodiment, the first holes are multiple and distributed in a one-to-one correspondence with the stator slots.

[0014] According to a second aspect of the utility model, a motor is provided, comprising the above-mentioned stator assembly and a shell arranged outside the stator assembly, wherein the stator and the shell form the first oil chamber at the oil chamber groove.

[0015] According to a third aspect of the utility model, a vehicle is provided, comprising the above-mentioned motor.

[0016] The above technical solution has the following beneficial effects: Structurally, the stator assembly is provided with an oil chamber groove, a first flow channel, a second oil chamber and a second flow channel which are connected in sequence. When the stator is working, the oil chamber groove receives the cooling medium, and the cooling medium enters the second oil chamber through the first flow channel, and moves toward the axial ends of the stator through the second flow channel to cool the windings arranged in the stator slots, thereby improving the cooling and heat dissipation effect, and further ensuring the service life of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The disclosure of the present invention will become easier to understand with reference to the accompanying drawings. It should be understood that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In the drawings:

[0018] Figure 1 A three-dimensional diagram showing a stator assembly of an embodiment of the utility model;

[0019] Figure 2 A three-dimensional diagram showing an insulating bushing of a stator assembly according to an embodiment of the utility model;

[0020] Figure 3 A front view of a stator assembly of an embodiment of the utility model is shown;

[0021] Figure 4 For Figure 3 AA section view;

[0022] Figure 5 For Figure 3 BB cross-section diagram;

[0023] Figure 6 For Figure 5 Enlarged view of point C.

[0024] In the drawings, the same reference numerals are used for the same components. The drawings are not drawn to scale. DETAILED DESCRIPTION

[0025] The specific implementation of the utility model is further described below in conjunction with the accompanying drawings.

[0026] An embodiment of the present invention provides a stator assembly. Figures 1 to 6As shown, the stator assembly 100 includes a stator 1. A stator slot 11 is provided on the inner wall of the stator. The stator slots 11 are multiple and evenly arranged in the circumferential direction of the stator 1, and extend along the axial direction of the stator 1, and are mainly used to set the winding. According to this embodiment, an oil cavity groove 12 is provided on the outer wall of the stator 1. The oil cavity groove 12 extends along the circumferential direction of the stator 1. After the motor is installed, the oil cavity groove 12 and the shell (not shown in the figure) arranged outside the stator 1 form a first oil cavity 13 to receive the cooling medium from the cooling medium source. A second oil cavity 14 is provided on the wall of the stator 1. The second oil cavity 14 is distributed along the circumferential direction of the stator 1, and is mainly used to store the cooling medium. The second oil cavity 14 is connected to the oil cavity groove 12 through the first flow channel 15, so that the cooling medium in the first oil cavity 13 is supplied to the second oil cavity 14 through the first flow channel 15. Second flow channels 16 are provided at both axial ends of the second oil cavity 14. The second flow channel 16 extends axially and is located at the slot wall of the stator slot 11. One end of the second flow channel 16 is connected to the second oil chamber 14 to receive the cooling medium from the second oil chamber 14. The other end of the second flow channel 16 extends to the axial end face of the stator 1 to send the cooling medium out of the stator 1.

[0027] It can be seen that the stator assembly of this embodiment has an oil cavity groove 12, a first flow channel 15, a second oil cavity 14 and a second flow channel 16 which are connected in sequence. During the operation of the stator 1, the oil cavity groove 12 receives the cooling medium, and the cooling medium enters the second oil cavity 14 through the first flow channel 15, and the cooling medium in the second oil cavity 14 is transported to the axial ends of the stator through the second flow channel 16. Since the second flow channel 16 is arranged at the groove wall of the stator slot 11 and is distributed along the axial direction of the stator 1, the cooling medium has a very good cooling effect on the winding in the stator slot 11 during the flow of the cooling medium in the second flow channel 16, thereby ensuring the heat dissipation efficiency.

[0028] Insulating bushings 2 are respectively provided at both axial ends of the stator 1. The insulating bushing 2 includes an elastic bushing sleeve 21. The elastic bushing sleeve 21 itself is cylindrical, and its structure and quantity match the stator slot 11. After the elastic bushing sleeve 21 is inserted into the stator slot 11, it is in close contact with the slot wall of the stator slot 11. A convex portion 22 is provided on the elastic bushing sleeve 21. After the elastic bushing sleeve 21 is inserted into the stator slot 11, the elastic bushing sleeve 21 is spaced apart from the stator slot 11 at the convex portion 22 to form a second flow channel 16. That is to say, in this embodiment, the elastic bushing sleeve 21 is provided to form the second flow channel 16. This arrangement has a simple structure and is easy to implement in terms of process. It can be understood that there are two insulating bushings 2, and the elastic bushing sleeves 21 of the insulating bushing 2 are respectively inserted from both axial ends of the stator 1.

[0029] In a preferred embodiment, a plurality of protrusions 22 are provided on each elastic bushing 21, which are used to form a plurality of second flow channels 16 at the slot wall of each stator slot 11, so as to improve the cooling effect and ensure the uniformity of heat dissipation. Further preferably, the protrusions 22 on each elastic bushing 21 are distributed one-to-one on the two walls of the elastic bushing 21 along the circumferential direction of the stator 1. This arrangement can form protrusions 22 that are relatively distributed in the circumferential direction of the stator 1 in the inner cavity of each stator slot 11, and these pairs of relatively distributed protrusions 22 can serve the purpose of clamping and tightening the windings located in the stator slot 11, thereby improving the NVH of the vehicle.

[0030] The insulating bushing 2 also includes a bushing body 23. The bushing body 23 itself is in the shape of a circular disk and is fixedly connected to the elastic bushing sleeve 21. After the insulating bushing 2 is installed, the elastic bushing sleeve 21 is inserted into the stator slot 11, and the bushing body 23 abuts against the axial end face of the stator 1. The elastic bushing sleeve 21 penetrates the bushing body 23 in the axial direction of the stator 1. The insulating bushing 2 is an integral injection molded component and is connected to the stator 1 by, for example, welding or gluing. The insulating bushing 2 of this structure is simple in structure and easy to disassemble and install.

[0031] An upper oil baffle plate 24 and a lower oil baffle plate 25 are provided on the end surface of the bushing body 23 axially away from the stator 1. The upper oil baffle plate 24 is provided on the upper side of the stator 1 in the vertical direction (consistent with the up and down direction in the working state of the stator 1) and is located radially inside the stator slot 11. After the cooling medium in the second flow channel 16 corresponding to the position of the upper oil baffle plate 24 flows out, it falls on the upper oil baffle plate 24 and flows under the guidance of the upper oil baffle plate 24, thereby preventing the cooling medium from entering the air gap between the stator 1 and the rotor. The lower oil baffle plate 25 is provided on the lower side of the stator 1 in the vertical direction and is located radially outside the stator slot 11. At the same time, an oil return port 26 is provided on the lower oil baffle plate 25 at the lowest position of the stator 1 in the vertical direction. It can be understood that after the cooling medium in the second flow channel 16 corresponding to the position of the lower oil baffle plate 25 flows out, it falls on the lower oil baffle plate 25, and flows under the guidance of the lower oil baffle plate 25, and finally flows to the oil return port 26. The cooling medium flowing out of the oil return port 26 is finally recovered. Preferably, the upper oil baffle plate 24 and the lower oil baffle plate 25 are at least semicircularly distributed in the circumference of the bushing body 23, and are symmetrical about the vertical center of the bushing body 23. Of course, the upper oil baffle plate 24 and the lower oil baffle plate 25 can also overlap in the circumference of the bushing body 23 to prevent the cooling medium from entering the air gap between the stator 1 and the rotor to the greatest extent. The structure of the oil return port 26 can be a hole set on the lower oil baffle plate 25, or it can be a gap formed by the segmented setting of the lower oil baffle plate 25. An embodiment of the segmented setting of the lower oil baffle plate 25 is given in the figure of the utility model.

[0032] In order to reduce the difficulty of processing and ensure the smooth progress of construction. The stator 1 can be constructed as a split component. Specifically, the stator 1 includes a first stator component 17 and a second stator component 18. Among them, there are two second stator components 18, which are respectively arranged at the axial ends of the first stator component 17. The outer diameter of the first stator component 17 is smaller than the outer diameter of the second stator component 18, so as to form an oil cavity groove 12 on the outer wall of the stator 1. The inner wall of the first stator component 17 and the inner wall of the second stator component 18 are on the same arc surface. The stator slot 11 axially penetrates the first stator component 17 and the second stator component 18. A radially extending first hole 19 is provided on the first stator component 17 to form a first flow channel 15. Preferably, in order to dissipate heat evenly, the first holes 19 are multiple and distributed in a one-to-one correspondence with the stator slots 11. A sealing plate 20 is provided on the inner wall of the first stator component 17. The blocking plate 20 is used to block the opening of the stator slot 11 on the first stator component 17 to form a second oil chamber 14 at the stator slot 11 on the first stator component 17 .

[0033] In a preferred embodiment, the two second stator components 18 are symmetrically distributed with respect to the first stator component 17. The two insulating bushings 2 are also symmetrically distributed with respect to the first stator component 17. The elastic bushing sleeves 21 of the two insulating bushings 2 extend in the stator slots 11 of the corresponding second stator component 18 to dock with the second oil chamber 14. In one embodiment of the utility model, the cooling medium is an oil cooling medium.

[0034] The utility model also relates to a motor and a vehicle. The motor comprises the above-mentioned stator assembly 100 and a housing. After installation, the stator assembly 100 and the housing form a first oil cavity 13 at the oil cavity groove 12 for receiving a cooling medium from a cooling medium source. The vehicle comprises the above-mentioned motor.

[0035] In the present invention, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0036] The above are only the principles and preferred embodiments of the present invention. It should be noted that, for those skilled in the art, on the basis of the principles of the present invention, several other modifications can be made, which should also be considered as the protection scope of the present invention.

Claims

1. A stator assembly, characterized in that: The invention comprises a stator, wherein a stator slot extending along the axial direction of the stator is arranged on the inner wall of the stator, an oil cavity slot extending along the circumferential direction of the stator is arranged on the outer wall of the stator to form a first oil cavity, a second oil cavity distributed along the circumferential direction of the stator is arranged on the stator, the second oil cavity is communicated with the oil cavity slot through a first flow channel, second flow channels extending along the axial direction of the stator are arranged at both ends of the second oil cavity along the axial direction of the stator, the second flow channel is located at the groove wall of the stator slot, one end of the second flow channel is communicated with the second oil cavity and the other end of the second flow channel extends to the axial end face of the stator.

2. The stator assembly according to claim 1, characterized in that: Insulating bushings are respectively arranged at both axial ends of the stator, each of the insulating bushings includes an elastic bushing sleeve for being tightly inserted into the stator slot, a convex portion is arranged on the elastic bushing sleeve, and the elastic bushing sleeve and the stator slot are spaced apart at the convex portion to form the second flow channel.

3. The stator assembly according to claim 2, characterized in that: The protrusions on each of the elastic bushings are distributed in a one-to-one correspondence on two walls of the elastic bushing in the circumferential direction of the stator.

4. The stator assembly according to claim 3, characterized in that: The insulating bushing also includes a bushing body in the shape of an annular disk fixedly connected to the elastic bushing sleeve. The bushing body abuts against the axial end surface of the stator, and the elastic bushing sleeve penetrates the bushing body in the axial direction of the stator.

5. The stator assembly according to claim 4, characterized in that: An upper oil baffle plate and a lower oil baffle plate are arranged on the end surface of the bushing body axially away from the stator. The upper oil baffle plate is arranged on the vertical upper side of the stator and is located on the inner side of the stator slot in the radial direction of the stator, while the lower oil baffle plate is arranged on the vertical lower side of the stator and is located on the outer side of the stator slot in the radial direction of the stator. An oil return port is arranged on the lower oil baffle plate at the lowest position in the vertical direction of the stator.

6. The stator assembly according to claim 5, characterized in that: The upper oil baffle plate and the lower oil baffle plate are both distributed in at least a semicircle in the circumferential direction of the bushing body and are symmetrical about the vertical center of the bushing body.

7. The stator assembly according to any one of claims 1 to 6, characterized in that: The stator includes a first stator component and second stator components arranged at two axial ends of the first stator component, wherein the outer diameter of the first stator component is smaller than the outer diameter of the second stator component to form the oil chamber groove at the first stator component, a radially extending first hole is arranged on the first stator component to form the first flow channel, and a sealing plate is arranged on the inner wall of the first stator component to seal the stator groove arranged on the first stator component to form the second oil chamber.

8. The stator assembly according to claim 7, characterized in that: There are a plurality of first holes, which are distributed in a one-to-one correspondence with the stator slots.

9. A motor, characterized in that: It comprises a stator assembly according to any one of claims 1 to 8 and a housing arranged outside the stator assembly, wherein the stator and the housing form the first oil chamber at the oil chamber groove.

10. A vehicle, characterized in that: Comprising an electric machine according to claim 9.

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