electric machine

Abstract

The present disclosure relates to an electric machine, comprising: a housing having a liquid inlet and a liquid outlet; a stator comprising a stator core and a stator winding, the stator core and the housing enclosing a first flow channel, the first flow channel being in communication with the liquid inlet; a potting structure, the two ends of the stator winding in the axial direction being wrapped by the potting structure respectively, the potting structure and the housing enclosing a second flow channel, the second flow channel being in communication between the first flow channel and the liquid outlet, the electric machine having a good heat dissipation effect and being able to balance the heat dissipation effect and the small size.

Description

Technical Field

[0001] This disclosure relates to the field of motor technology, and more specifically, to a motor. Background Technology

[0002] In related technologies, the stator of a motor generates a large amount of heat during continuous operation, causing the motor temperature to rise. Excessive motor temperature can affect the motor's performance and reliable operation. Therefore, the motor's heat dissipation effect is poor. Utility Model Content

[0003] The purpose of this disclosure is to provide an oil-cooled motor that has good heat dissipation performance and can balance heat dissipation performance with miniaturization.

[0004] To achieve the above objectives, this disclosure provides an electric motor, comprising: a housing having a liquid inlet and a liquid outlet; a stator including a stator core and a stator winding, the stator core and the housing forming a first flow channel, the first flow channel communicating with the liquid inlet; and a potting structure, wherein both ends of the stator winding in the axial direction are respectively wrapped by the potting structure, the potting structure and the housing forming a second flow channel, the second flow channel communicating between the first flow channel and the liquid outlet.

[0005] Optionally, the potting structure has a first annular groove, and the outer wall of the potting structure is attached to the inner wall of the housing, so that the inner wall of the housing and the first annular groove together form the second flow channel.

[0006] Optionally, the number of the second flow channels is at least two, and the at least two second flow channels are arranged sequentially and connected along the axial direction of the stator, and any two adjacent second flow channels are interconnected.

[0007] Optionally, the potting structure includes a plurality of potting rings arranged sequentially along the axial direction, with two adjacent potting rings forming the first annular groove, and the potting rings having a connecting port that connects two adjacent second flow channels.

[0008] Optionally, the housing has a shoulder, and the axial end face of the stator core is spaced apart from the shoulder to form a connecting channel, which connects the first channel and the innermost second channel.

[0009] Optionally, the first flow channel includes a main flow channel, the housing has a second annular groove, and the outer wall of the stator core and the second annular groove form the main flow channel.

[0010] Optionally, the first flow channel includes an auxiliary flow channel, the housing has a plurality of axially extending auxiliary grooves, the plurality of auxiliary grooves are arranged at intervals along the circumference of the stator, the outer wall of the stator core and the auxiliary grooves form the auxiliary flow channel, and the auxiliary grooves connect the main flow channel and the second flow channel.

[0011] Optionally, the thermal conductivity of the potting structure is at least 1.5 W / (mK) to 2.5 W / (mK).

[0012] Optionally, the housing is provided with an oil collecting chamber and an oil collecting hole that are connected to each other. The oil collecting hole is connected to the second flow channel, and the oil collecting chamber is connected to the liquid outlet.

[0013] Optionally, both the liquid inlet and the liquid outlet extend radially along the housing.

[0014] Through the above technical solution, when motor cooling is required, coolant can enter the first flow channel through the inlet of the housing. Since the first flow channel is connected to the second flow channel, after the coolant has sufficiently cooled the stator core through the first flow channel, it can enter the second flow channel to fully cool both ends of the stator, and then flow out of the motor through the outlet. Thus, by setting a potting structure that forms the second flow channel together with the housing, and connecting the second and first flow channels, the coolant can flow through the stator core to the stator windings at the ends, thereby fully cooling the motor's interior and improving heat dissipation. Simultaneously, it eliminates the need for additional cooling oil ring components, saving motor space and facilitating the minimization of the stator core's outer diameter, achieving a compact motor design. This avoids the need to add heat dissipation structures to the stator core, which would increase the stator core's outer diameter, thus reducing motor size and manufacturing costs.

[0015] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0017] Figure 1 This is an assembly diagram of a motor provided according to an embodiment of this disclosure;

[0018] Figure 2 This is a cross-sectional view of the stator and potting structure of an electric motor provided according to an embodiment of the present disclosure;

[0019] Figure 3 This is a schematic diagram of the stator and potting structure of an electric motor according to an embodiment of this disclosure;

[0020] Figure 4 This is a cross-sectional view of the housing of an electric motor provided according to an embodiment of this disclosure;

[0021] Figure 5 This is a schematic diagram of the structure of the motor housing provided according to an embodiment of the present disclosure.

[0022] Explanation of reference numerals in the attached figures

[0023] 1-Housing, 11-Inlet, 12-Outlet, 13-Shoulder, 14-Second annular groove, 15-Auxiliary groove, 16-Oil collecting cavity, 17-Oil collecting hole, 2-Stator, 21-Stator core, 211-End face, 3-Potting structure, 31-First annular groove, 32-Potting ring, 321-Connecting port, 4-First flow channel, 41-Main flow channel, 42-Auxiliary flow channel, 5-Second flow channel, 6-Connecting flow channel. Detailed Implementation

[0024] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0025] In this disclosure, unless otherwise stated, the directional terms "inner" and "outer" refer to "inner" and "outer" relative to the contour of the corresponding component itself. Furthermore, the use of terms such as "first" and "second" is intended to distinguish different components and does not imply sequentiality or importance. Additionally, in the following description, when referring to the accompanying drawings, the same reference numerals in different drawings denote the same elements. Those skilled in the art should understand that the above definitions are for explanation and illustration only and should not be construed as limiting the scope of this disclosure.

[0026] According to a specific embodiment of this disclosure, refer to Figures 1 to 5 As shown, an electric motor is provided, including: a housing 1 having a liquid inlet 11 and a liquid outlet 12; a stator 2 including a stator core 21 and a stator winding, the stator core 21 and the housing 1 forming a first flow channel 4, the first flow channel 4 being connected to the liquid inlet 11; and a potting structure 3, the two ends of the stator winding being respectively wrapped by the potting structure 3 in the axial direction, the potting structure 3 and the housing 1 forming a second flow channel 5, the second flow channel 5 being connected between the first flow channel 4 and the liquid outlet 12.

[0027] Through the above technical solution, when the motor needs cooling, the coolant can enter the first flow channel 4 through the inlet 11 of the housing 1. Since the first flow channel 4 is connected to the second flow channel 5, after the coolant has sufficiently cooled the stator core 21 through the first flow channel 4, it can enter the second flow channel 5 to fully cool both ends of the stator 2, and then flow out of the motor through the outlet 12. Thus, by setting up a potting structure 3 that can form the second flow channel 5 together with the housing 1, and the second flow channel 5 being connected to the first flow channel 4, the coolant can flow through the stator core 21 to the stator windings at the ends, thereby fully cooling the inside of the motor and improving the heat dissipation effect. At the same time, it eliminates the need for additional cooling oil ring components, saving motor space and facilitating the minimization of the outer diameter of the stator core 21, achieving a compact motor design. It avoids the need to set up heat dissipation structures on the stator core 21 to increase the outer diameter of the stator core 21, thereby reducing the motor size and manufacturing cost.

[0028] In this process, potting compound is typically used to encapsulate the ends of the stator windings, forming a potting structure 3, which provides insulation, protection, and fixation for the stator windings.

[0029] In some embodiments of this disclosure, reference is made to Figures 1 to 3 As shown, the potting structure 3 may have a first annular groove 31. The outer wall of the potting structure 3 is fitted to the inner wall of the housing 1, so that the inner wall of the housing 1 and the first annular groove 31 together form the second flow channel 5. In this way, the outer wall of the potting structure 3 is fitted to the inner wall of the housing 1, so that the coolant flowing in from the first flow channel 4 can flow into the first annular groove 31, preventing the coolant from leaking along the gap between the potting structure 3 and the housing 1. Furthermore, the first annular groove 31 can guide the coolant, allowing the coolant entering the second flow channel 5 to flow along the circumference of the stator 2, thereby achieving sufficient heat dissipation and improving cooling efficiency. The stator 2 and the housing 1 can be an interference fit to achieve the fit between the outer wall of the potting structure 3 and the inner wall of the housing 1.

[0030] In some embodiments of this disclosure, reference is made to Figures 1 to 3 As shown, there can be at least two second flow channels 5, which are arranged sequentially and connected along the axial direction of the stator 2, and any two adjacent second flow channels 5 are interconnected. In this way, when the coolant in the first flow channel 4 enters the second flow channel 5, it can flow circumferentially along the stator 2 in at least two second flow channels 5, thereby extending the heat exchange path between the coolant and the stator 2, increasing the contact time between the coolant and the stator 2, thereby improving cooling efficiency and achieving sufficient heat dissipation.

[0031] In some embodiments of this disclosure, reference is made to Figures 1 to 3As shown, the potting structure 3 may include a plurality of potting rings 32 arranged sequentially along the axial direction. Two adjacent potting rings 32 form a first annular groove 31, and the potting rings 32 have connecting ports 321 that connect two adjacent second flow channels 5. In this way, each first annular groove 31 can form a second flow channel 5 with the inner wall of the housing 1 to guide the coolant to flow circumferentially along the stator 2. By providing connecting ports 321 on the potting rings 32, the coolant can enter an adjacent second flow channel 5 from one second flow channel 5. Thus, the connecting ports 321 can guide the coolant to flow axially along the stator 2, so that after flowing circumferentially, the coolant can enter another second flow channel 5 and continue to flow circumferentially along the stator 2, forming an orderly flow path, extending the heat exchange path, and avoiding the situation where the heat exchange efficiency decreases due to the chaotic flow path of the coolant.

[0032] In some embodiments of this disclosure, reference is made to Figure 1 As shown, the housing 1 may have a shoulder 13, and the axial end face 211 of the stator core 21 is spaced apart from the shoulder 13 to form a connecting channel 6, which connects the first channel 4 and the innermost second channel 5. This allows coolant to enter the connecting channel 6 through the gap between the shoulder 13 and the axial end face 211 of the stator core 21, and thus enter the second channel 5. Therefore, the connecting channel 6 enables communication between the first channel 4 and the second channel 5, allowing coolant to flow to both ends of the stator 2 for cooling. Furthermore, the connecting channel 6 can be formed naturally by the shoulder 13 and the stator core 21, eliminating the need for additional pipes or joints and simplifying the motor structure.

[0033] In some embodiments of this disclosure, reference is made to Figure 4 and Figure 5 As shown, the first flow channel 4 may include a main flow channel 41. The housing 1 has a second annular groove 14, and the outer wall of the stator core 21 and the second annular groove 14 form the main flow channel 41. The inlet 11 can communicate with the main flow channel 41. In this way, the coolant entering through the inlet 11 can first enter the main flow channel 41 and be guided by the second annular groove 14 to flow circumferentially along the stator 2, so that the coolant can flow evenly to the first flow channel 4, and this facilitates sufficient heat dissipation from the stator core 21 circumferentially, improving heat exchange efficiency.

[0034] In some embodiments of this disclosure, reference is made to Figure 4 and Figure 5As shown, the first flow channel 4 may include an auxiliary flow channel 42. The housing 1 has multiple axially extending auxiliary grooves 15, which are spaced apart circumferentially along the stator 2. The outer wall of the stator core 21 and the auxiliary grooves 15 form the auxiliary flow channel 42, which connects to the main flow channel 41 and the second flow channel 5. The auxiliary grooves 15 are connected to both the main flow channel 41 and the second flow channel 5. This arrangement of multiple auxiliary grooves 15 along the circumferential direction of the stator 2 allows the coolant in the main flow channel 41 to flow evenly into the circumferential auxiliary grooves 15, thus providing uniform heat dissipation to the stator core 21. Since the auxiliary grooves 15 extend axially, they guide the coolant flow to the second flow channel 5, achieving sufficient heat dissipation in the axial direction of the stator core 21. This improves the heat dissipation effect on the stator core 21.

[0035] The second annular groove can be located in the middle of the auxiliary groove 15 along the axial direction, so that the coolant entering the main channel 41 can flow evenly into the second flow channels 5 at both ends of the stator 2, ensuring the heat dissipation effect on the ends of the stator 2.

[0036] In some embodiments of this disclosure, the thermal conductivity of the potting structure 3 is at least 1.5 W / (mK) to 2.5 W / (mK). The potting structure 3 tightly fills the gaps between the stator winding and the core and housing 1, replacing the air layer and forming a continuous heat conduction path. In this way, by setting the potting structure 3 as a material with high thermal conductivity, it is beneficial to shorten the heat conduction path from heat sources such as the stator winding and stator core 21 to the second flow channel 5, so as to quickly transfer the heat generated by the stator 2 to the contact surface of the coolant and improve the heat dissipation effect.

[0037] In some embodiments of this disclosure, reference is made to Figure 1 and Figure 4 As shown, the housing 1 may be provided with a connected oil collecting chamber 16 and an oil collecting hole 17. The oil collecting hole 17 is connected to the second flow channel 5, and the oil collecting chamber 16 is connected to the outlet 12. In this way, the coolant entering the second flow channel 5 can circulate along the multiple first annular grooves 31 and then enter the oil collecting chamber 16 through the oil collecting hole 17, so that the coolant in the oil collecting chamber 16 can flow out of the motor through the outlet 12. Thus, the coolant enters the motor through the inlet 11, and after passing through the first flow channel 4 and the second flow channel 5, it flows out through the oil collecting hole 17 and the oil collecting chamber 16, and then through the outlet 12, realizing the circulation of the coolant and ensuring the heat dissipation effect on the motor.

[0038] In some embodiments of this disclosure, reference is made to Figure 1As shown, both the inlet 11 and the outlet 12 can extend radially along the housing 1. This reduces the axial space occupied by the motor, which is beneficial for achieving a compact motor design, and also allows external pipelines to be connected to the radial pipelines of the inlet 11 and the outlet 12, improving the connection efficiency of the connecting pipelines.

[0039] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0040] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0041] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. An electric machine characterized in that, include: The casing has a liquid inlet and a liquid outlet; The stator includes a stator core and a stator winding, wherein the stator core and the housing form a first flow channel, and the first flow channel is connected to the liquid inlet. The stator winding is encapsulated at both ends along its axial direction. The encapsulation structure and the housing form a second flow channel, which connects the first flow channel and the liquid outlet.

2. The electric machine of claim 1, wherein, The potting structure has a first annular groove, and the outer wall of the potting structure is attached to the inner wall of the housing so that the inner wall of the housing and the first annular groove together form the second flow channel.

3. The motor according to claim 2, characterized in that, The number of the second flow channels is at least two, and the at least two second flow channels are arranged and connected sequentially along the axial direction of the stator, and any two adjacent second flow channels are connected to each other.

4. The motor according to claim 3, characterized in that, The potting structure includes a plurality of potting rings arranged sequentially along the axial direction, with two adjacent potting rings forming the first annular groove, and the potting rings having a connecting port that connects two adjacent second flow channels.

5. The motor according to claim 3 or 4, characterized in that, The housing has a shoulder, and the axial end face of the stator core is spaced apart from the shoulder to form a connecting channel, which connects the first channel and the innermost second channel.

6. The motor according to claim 1, characterized in that, The first flow channel includes a main flow channel, the housing has a second annular groove, and the outer wall of the stator core and the second annular groove form the main flow channel.

7. The motor according to claim 6, characterized in that, The first flow channel includes an auxiliary flow channel. The housing has a plurality of axially extending auxiliary grooves. The plurality of auxiliary grooves are arranged at intervals along the circumference of the stator. The outer wall of the stator core and the auxiliary grooves form the auxiliary flow channel. The auxiliary grooves connect the main flow channel and the second flow channel.

8. The motor according to claim 1, characterized in that, The thermal conductivity of the potting structure is at least 1.5 W / (mK) to 2.5 W / (mK).

9. The motor according to claim 1, characterized in that, The housing is provided with an oil collecting chamber and an oil collecting hole that are connected to each other. The oil collecting hole is connected to the second flow channel, and the oil collecting chamber is connected to the liquid outlet.

10. The motor according to claim 1, characterized in that, Both the liquid inlet and the liquid outlet extend radially along the shell.

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