Motor stator oil cooling structure and motor

Abstract

The utility model discloses motor stator oil cooling structure and motor, motor stator oil cooling structure includes casing (1), stator core (2) and winding (3), and the outer periphery of casing (1) is arranged at stator core (2) and winding (3), and the inner periphery of the first end of casing (1) is integrally provided with annular sheltering portion (201), and the oil cooling cavity (6) is formed between annular sheltering portion (201), stator core (2) and the first end of casing (1), and the oil inlet hole (8) that communicates with oil cooling cavity (6) is provided on casing (1), and the first oil injection hole (4) is seted up on annular sheltering portion (201), and the yoke portion of stator core (2) is provided with a plurality of oil cooling channels (7), and the first end of oil cooling channel (7) communicates with oil cooling cavity (6), and the second end of oil cooling channel (7) is provided with the second oil injection hole (5). The scheme structure is simple, and the degree of integration is high, and the cooling effect is excellent, can improve the cooling effect while controlling the cost.

Description

Technical Field

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

[0002] With the development of new energy vehicles, high-end equipment, and high-efficiency drive systems, electric motors are evolving towards higher power density, higher integration, and higher reliability. Traditional water-cooled motors, as the mainstream cooling solution in the early new energy field, rely on coolant circulating in external water channels of the motor housing to dissipate heat through indirect heat exchange between the housing and internal heat-generating components. Although the structure is relatively simple and the manufacturing cost is low, its heat dissipation performance cannot meet the needs of current high-power motors.

[0003] To overcome the aforementioned shortcomings, the existing improvement method is to use oil cooling technology instead of water cooling. Oil-cooled motors directly introduce insulating cooling oil into the motor and use methods such as spraying and oil slinging to directly cool the heat-generating components, significantly shortening the heat dissipation path and improving the overall heat dissipation efficiency.

[0004] A common oil-cooling solution involves adding oil spray ring assemblies to both ends of the motor. These rings provide directional cooling to the winding ends through spray holes. Examples include the oil-cooled motor stator and motor disclosed in utility model patent CN219041484U, and the stator structure disclosed in utility model patent CN215344129U. Both patents feature cooling oil rings / oil spray rings at both ends of the stator, which can improve temperature uniformity to some extent. However, these oil spray rings are typically independent injection-molded parts and require installation with sealing rings, resulting in a complex structure, a large number of parts, and increased manufacturing costs. Utility Model Content

[0005] Therefore, in order to solve the above problems, this utility model provides a motor stator oil cooling structure and a motor.

[0006] This utility model is achieved through the following technical solution: An oil-cooling structure for a motor stator includes a housing, a stator core, and windings. The stator core includes a toothed portion and a yoke portion. The toothed portion includes a plurality of stator teeth, and stator slots are formed between adjacent stator teeth. The windings pass through the stator slots and extend to the outside of both ends of the stator core. The housing is disposed on the outer periphery of the stator core and the windings. An annular shielding portion is integrally provided on the inner circumference of the first end of the housing. The free end of the annular shielding portion abuts against the yoke portion of the stator core, thereby forming an oil-cooling cavity between the annular shielding portion, the stator core, and the first end of the housing. An oil inlet hole communicating with the oil-cooling cavity is provided on the housing. A first oil spray hole is provided on the annular shielding portion facing the direction of the windings. The yoke portion of the stator core is provided with a plurality of oil-cooling channels that penetrate the stator core axially. The first end of each oil-cooling channel communicates with the oil-cooling cavity, and the second end of each oil-cooling channel is provided with a second oil spray hole.

[0007] Preferably, the first end of the housing includes a narrowing section that narrows toward the inner circumference of the housing, the first end of the narrowing section extending toward the axial direction to form a straight section, and the annular blocking portion extending from the second end of the straight section toward the yoke of the stator core.

[0008] Preferably, the first injection hole is located at the junction of the annular shield and the straight section.

[0009] Preferably, the stator core includes a plurality of first laminations of the same shape stacked along the axial direction. The first laminations are provided with a plurality of first through holes at equal angles along the circumference, and the first through holes on the plurality of first laminations are stacked along the axial direction to form an oil cooling channel.

[0010] Preferably, the stator core further includes at least two sets of second laminations, each of which has a second oil injection hole at the second end of each oil cooling channel. The second oil injection holes on adjacent sets of second laminations are connected and located at different radial positions.

[0011] Preferably, the same set of second laminations includes two types of second oil injection holes located at different radial positions, and the two types of second oil injection holes are alternately arranged on the second laminations.

[0012] Preferably, the stator core includes two sets of second laminations with the same shape. The number of second oil injection holes on each second lamination is twice the number of first through holes on the first lamination. The two sets of second laminations are axially deflected, and the deflection angle between the two sets of second laminations is equal to the included angle between two adjacent second oil injection holes.

[0013] Preferably, each stator slot is further provided with an insulating element, which is disposed between the stator slot and the winding inside the stator slot.

[0014] The electric motor includes the stator oil-cooled structure described above.

[0015] The beneficial effects of this utility model's technical solution are mainly reflected in: The stator oil-cooling structure of the motor only requires the housing and stator core to be fitted together, without the need for complex external components. The manufacturing process is simple and low-cost, making the overall structure of the motor more compact. At the same time, by forming an oil-cooling cavity between the annular shield, the stator core, and the first end of the housing, the cooling medium is continuously and stably delivered to the first oil injection hole and the oil-cooling channel. A second oil injection hole is set at the second end of the oil-cooling channel, forming a highly integrated and simple oil-cooling structure, which achieves efficient cooling of the windings and the stator core. The oil-cooling channel is built into the yoke of the stator core, avoiding the interference of opening oil circuits on the outer periphery on the structural strength and electromagnetic performance, and reducing the radial space occupied by the motor, which is suitable for the integrated design requirements of high power density motors. Attached Figure Description

[0016] Figure 1 This is a top view of the oil-cooled structure of the motor stator; Figure 2 yes Figure 1 Sectional view along the middle AA; Figure 3 yes Figure 2 Enlarged view of section B; Figure 4 yes Figure 2 Enlarged view of section C; Figure 5 This is a first-person perspective 3D view of the motor stator oil-cooled structure; Figure 6 This is a two-dimensional view of the motor stator oil-cooled structure from a second perspective; Figure 7 This is a three-dimensional view of the housing in the oil-cooled stator structure of the motor; Figure 8 This is a top view of the first lamination in the oil-cooled stator structure of the motor. Figure 9 This is a top view of the second lamination in the oil-cooled stator structure of the motor. Detailed Implementation

[0017] To make the objectives, advantages, and features of this utility model clearer and more detailed, the following non-limiting description of preferred embodiments will be illustrated and explained. These embodiments are merely typical examples of applying the technical solutions of this utility model; any technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of protection claimed by this utility model.

[0018] It should also be stated that, in the description of the solution, the terms "center", "upper", "lower", "left", "right", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of description and simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0019] Furthermore, the terms "first" and "second" in this solution are used for descriptive purposes only and should not be construed as indicating or implying a ranking of importance, or implicitly specifying the number of technical features shown. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0020] This utility model discloses an oil-cooled structure for a motor stator, such as... Figures 1-6 As shown, the device includes a housing 1, a stator core 2, and a winding 3. The stator core 2 includes a toothed portion and a yoke portion. The toothed portion includes a plurality of stator teeth arranged at equal angles on the inner circumference of the stator core 2. Stator slots are formed between adjacent stator teeth. The winding 3 passes through the stator slots and extends to the outside of both ends of the stator core 2. The two ends of the stator core 2 are the axial ends of the stator core 2.

[0021] like Figures 2-7 As shown, the housing 1 is disposed on the outer periphery of the stator core 2 and the winding 3. Both ends of the housing 1 extend to the outside of both ends of the stator core 2 and the winding 3. An annular shielding part 201 is integrally disposed on the inner circumference of the first end of the housing 1. One end of the annular shielding part 201 is disposed on the inner wall of the first end of the housing 1. An annular space is formed between the first end of the housing 1 and the annular shielding part 201. The free end of the annular shielding part 201 abuts against the yoke of the stator core 2, so that the yoke of the stator core 2 closes the space. An oil cooling cavity 6 is formed between the annular shielding part 201, the stator core 2 and the first end of the housing 1. An oil inlet hole 8 is provided on the housing 1, which communicates with the oil cooling cavity 6. The external cooling medium communicates with the oil inlet hole 8 and is input into the oil cooling cavity 6 through the oil inlet hole 8.

[0022] like Figures 2-4As shown, the annular shielding part 201 has a first oil spray hole 4 facing the direction of the winding 3. The yoke of the stator core 2 is provided with a plurality of oil cooling channels 7 that penetrate the stator core 2 axially. The first end of the oil cooling channel 7 is connected to the oil cooling cavity 6, and the second end of the oil cooling channel 7 is also provided with a second oil spray hole 5. Therefore, part of the cooling medium entering the oil cooling cavity 6 will be sprayed out from the first oil spray hole 4 onto the winding 3 located at the first end of the stator core 2, and the other part of the cooling medium in the oil cooling cavity 6 will pass through the oil cooling channel 7 through the yoke of the stator core 2 and be sprayed out from the second oil spray hole 5 onto the winding 3 located at the second end of the stator core 2, thereby simultaneously cooling the stator core 2 and the winding 3.

[0023] like Figure 2 , Figure 4 As shown, in some embodiments, the first end of the housing 1 includes a narrowing section 202 that narrows towards the inner circumference of the housing 1. The first end of the narrowing section 202 extends towards the axial direction and forms a straight section 203. The annular blocking portion 201 extends from the second end of the straight section 203 toward the yoke of the stator core 2. In a preferred embodiment, the diameter of the straight section 203 is equal to the minimum diameter of the narrowing section 202. The inner circumferential surface of the annular blocking portion 201 and the inner circumferential surface of the straight section 203 are located on the same annular surface. The narrowing section 202, the straight section 203, and the annular blocking portion 201 are coaxially arranged.

[0024] like Figure 2 , Figure 4 As shown, in some embodiments, the first oil injection hole 4 is located at the junction of the annular shield 201 and the straight section 203. In this case, the first oil injection hole 4 is located at the first end of the oil cooling cavity 6 to achieve precise spray cooling of the end of the winding 3. The oil cooling channel 7 is connected to the second end of the oil cooling cavity 6, so that the two outlets of the oil cooling cavity 6 are spaced apart to ensure that the cooling medium has enough space in the oil cooling cavity 6 for self-balancing of pressure and flow, so that both cooling paths can obtain a relatively stable and sufficient oil supply.

[0025] like Figure 2 , Figure 8 As shown, in some embodiments, the stator core 2 includes a plurality of first laminations 204 of the same shape stacked along the axial direction. The first laminations 204 are provided with a plurality of first through holes 2041 at equal angles along the circumference. The first through holes 2041 on the plurality of first laminations 204 are stacked along the axial direction to form an oil cooling channel 7, thereby forming a plurality of cooling paths at equal angles in the yoke of the stator core 2, so as to achieve uniform cooling of each region of the stator.

[0026] like Figure 2 , Figure 3 , Figure 9As shown, in some embodiments, the stator core 2 further includes at least two sets of second laminations 205. Each second lamination 205 is provided with a second oil injection hole 5 at the second end of each oil cooling channel 7. The second oil injection hole 5 of the set of second laminations 205 connected to the first lamination 204 communicates with the oil cooling channel 7. The second oil injection holes 5 on two adjacent sets of second laminations 205 communicate with each other and are located at different radial positions. In a preferred embodiment, the second oil injection holes 5 on multiple sets of second laminations 205 arranged from the first end to the second end are gradually arranged radially inward, thereby forming a stepped oil injection channel that gradually advances inward at the second end of the oil cooling channel 7.

[0027] In some embodiments, the same group of second laminations 205 includes two types of second oil injection holes 5 located at different radial positions. The number of second oil injection holes 5 on each second lamination 205 is twice the number of first through holes 2041 on the first lamination 204, and the two types of second oil injection holes 5 are alternately arranged on the second laminations 205, wherein one type of second oil injection hole 5 is located radially inner and the other type of second oil injection hole 5 is located radially outer, such as... Figure 3 , Figure 9 As shown, in a preferred embodiment, the stator core 2 includes two sets of second laminations 205 of the same shape. On the second lamination 205 connected to the first lamination 204, a second oil injection hole 5 located radially outward communicates with a first through hole 2041, and a second oil injection hole 5 located radially inward should be located radially inward of the first through hole 2041. The second oil injection hole 5 located radially inward is closed by the yoke of the first lamination 204 and does not participate in the transport of cooling medium. Due to the deflection angle of the two sets of second laminations 205, the two sets of second laminations... The second oil injection holes 5 on 205 are offset by one position. Therefore, on a set of second laminations 205 that are far away from the first lamination 204, a second oil injection hole 5 located on the radially inner side participates in conveying the cooling medium. The radial positions of the first through hole 2041, the second oil injection hole 5 located on the radially inner side, and the second oil injection hole 5 located on the radially outer side advance inward in sequence, thereby forming a stepped oil injection channel that advances inward in a step-like manner at the second end of the oil cooling channel. In this embodiment, only two sets of second laminations 205 with the same shape need to be prepared, which can reduce manufacturing costs.

[0028] Winding 3 is the main heat source inside the motor. The closer the heat dissipation structure is to winding 3, the better the heat dissipation effect. However, since winding 3 carries high voltage, it needs to maintain an electrical clearance with metal parts such as the housing 1 to prevent insulation failure. Therefore, the annular shielding part 201 is radially spaced from winding 3, forming an electrical clearance. Meanwhile, as... Figure 4As shown, since the oil cooling channel 7 communicates with the oil cooling cavity 6, the radial distance between the first through hole 2041 and the stator slot should be greater than or equal to the sum of the thickness of the annular shield 201 and the electrical clearance, thereby preventing the oil cooling channel 7 from connecting to the radially inner side of the oil cooling cavity 6 or being blocked by the annular shield 201. Figure 4 As shown, in a preferred embodiment, the first through hole 2041 is located radially inside the annular shielding portion 201 (i.e., the radial distance between the first through hole 2041 and the stator slot is equal to the sum of the thickness of the annular shielding portion 201 and the electrical clearance). This ensures that the electrical clearance and the oil cooling channel 7 are connected to the oil cooling cavity 6, while bringing the oil cooling channel 7 as close as possible to the inner circumference of the stator core 2, thereby shortening the heat dissipation path, accelerating the heat dissipation speed, and improving the continuous performance of the motor.

[0029] like Figure 2 , Figure 3 As shown, in some embodiments, each stator slot is further provided with an insulating element 9, which is disposed between the stator slot and the winding 3 inside the stator slot. The insulating element 9 can be an existing insulating product, such as insulating varnish or insulating paper, which will not be described in detail here.

[0030] This utility model also discloses an electric motor, including the motor stator oil-cooling structure described above.

[0031] This utility model has many other embodiments. All technical solutions formed by equivalent transformation or equivalent transformation fall within the protection scope of this utility model.

Claims

1. An oil-cooled stator structure for an electric motor, comprising a housing (1), a stator core (2), and a winding (3), wherein the stator core (2) comprises a toothed portion and a yoke portion, the toothed portion comprising a plurality of stator teeth, stator slots being formed between adjacent stator teeth, and the winding (3) passing through the stator slots and extending to the outside of both ends of the stator core (2), characterized in that: The housing (1) is disposed on the outer periphery of the stator core (2) and the winding (3). An annular shielding part (201) is integrally disposed on the inner periphery of the first end of the housing (1). The free end of the annular shielding part (201) abuts against the yoke of the stator core (2), so that an oil cooling cavity (6) is formed between the annular shielding part (201), the stator core (2) and the first end of the housing (1). An oil inlet hole (8) communicating with the oil cooling cavity (6) is disposed on the housing (1). A first oil spray hole (4) is opened on the annular shielding part (201) in the direction of the winding (3). A plurality of oil cooling channels (7) penetrating the stator core (2) along the axial direction are disposed on the yoke of the stator core (2). The first end of the oil cooling channel (7) is communicating with the oil cooling cavity (6). A second oil spray hole (5) is also disposed on the second end of the oil cooling channel (7).

2. The motor stator oil-cooling structure according to claim 1, characterized in that: The first end of the housing (1) includes a narrowing section (202) that narrows toward the inner circumference of the housing (1), the first end of the narrowing section (202) extends toward the axial direction and forms a straight section (203), and the annular shield (201) extends from the second end of the straight section (203) toward the yoke of the stator core (2).

3. The motor stator oil-cooling structure according to claim 2, characterized in that: The first oil injection hole (4) is located at the junction of the annular shield (201) and the straight section (203).

4. The motor stator oil-cooling structure according to claim 1, characterized in that: The stator core (2) includes multiple first laminations (204) of the same shape stacked along the axial direction. Multiple first through holes are provided on the first laminations (204) at equal angles along the circumference. The first through holes on the multiple first laminations (204) are stacked along the axial direction to form an oil cooling channel (7).

5. The motor stator oil-cooling structure according to claim 4, characterized in that: The stator core (2) also includes at least two sets of second laminations (205). Each second lamination (205) has a second oil injection hole (5) at the second end of each oil cooling channel (7). The second oil injection holes (5) on two adjacent sets of second laminations (205) are connected and located at different radial positions.

6. The motor stator oil-cooling structure according to claim 5, characterized in that: The same set of second laminations (205) includes two types of second oil injection holes (5) located at different radial positions, and the two types of second oil injection holes (5) are alternately arranged on the second laminations (205).

7. The motor stator oil-cooling structure according to claim 6, characterized in that: The stator core (2) includes two sets of second laminations (205) of the same shape. The number of second oil injection holes (5) on each second lamination (205) is twice the number of first through holes (2041) on the first lamination (204). The two sets of second laminations (205) are axially deflected, and the deflection angle between the two sets of second laminations (205) is equal to the included angle between two adjacent second oil injection holes (5).

8. The motor stator oil-cooling structure according to claim 1, characterized in that: Each stator slot is also provided with an insulating element (9), which is disposed between the stator slot and the winding (3) inside the stator slot.

9. An electric motor, characterized in that: Includes the motor stator oil-cooling structure as described in any one of claims 1-8.

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