A high-efficiency heat dissipation structure of a water-cooled flat wire motor

Abstract

The utility model discloses a kind of high-efficiency heat radiation structure of water-cooled flat wire motor, it is related to motor heat dissipation technical field, and it contains motor shell, cooling water channel for storing cooling medium is opened in motor shell;Stator core, stator core is connected and fixed on the inner wall of motor shell, both ends of stator core are all with winding wire package, winding wire package is annular, and annular cavity is formed between winding wire package and the inner wall of motor shell;Heat spreader, heat spreader is provided with multiple, multiple heat spreader equidistantly set in annular cavity;First profiling structure and second profiling structure that shape is accurately matched with winding wire package and motor shell inner wall are respectively arranged in the inside and outside of heat spreader in the scheme, efficient thermal contact between winding wire package and motor shell is realized, fill the gap in combination with potting adhesive, the vertical heat dissipation channel of low thermal resistance is jointly constructed, total thermal resistance from winding wire package to cooling water channel is effectively reduced, and heat dissipation efficiency is greatly improved.

Description

Technical Field

[0001] This utility model relates to a high-efficiency heat dissipation structure for a water-cooled flat wire motor, belonging to the field of motor heat dissipation technology. Background Technology

[0002] With the increasing demands for power density in drive motors from new energy vehicles, the problem of motor heat dissipation is becoming increasingly serious. The key challenge in motor heat dissipation lies in the cooling of the windings (coil), especially in flat-wire water-cooled motors. Their high slot fill factor design further exacerbates the temperature difference between the stator slots and the winding ends. In traditional water-cooled flat-wire motors, the heat at the winding ends is mainly conducted axially to the motor core through the copper conductor, and then to the housing through the core. Finally, it is carried away by the cooling medium in the housing water channels. This method has the problems of long heat dissipation path and high thermal resistance, making it difficult to effectively dissipate the heat at the winding ends. Therefore, a new solution is needed to address this issue. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a high-efficiency heat dissipation structure for a water-cooled flat wire motor.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is: a high-efficiency heat dissipation structure for a water-cooled flat wire motor, comprising...

[0005] The motor housing has cooling water channels for storing cooling medium.

[0006] The stator core is connected and fixed to the inner wall of the motor housing. Both ends of the stator core have winding coils. The winding coils are annular and form an annular cavity between the winding coils and the inner wall of the motor housing.

[0007] Multiple heat spreaders are provided and are equidistantly arranged in the annular cavity. Each heat spreader has a first conforming structure on its inner side that matches the winding coil, and the heat spreader is in close contact with the winding coil through the first conforming structure. Each heat spreader has a second conforming structure on its outer side that matches the inner wall of the motor housing, and the heat spreader is in close contact with the inner wall of the motor housing through the second conforming structure.

[0008] Preferably, the surface of the heat spreader is coated with a polyimide film.

[0009] Preferably, the annular cavity is provided with epoxy potting compound, which is used to fill the gaps between the winding coil, the heat spreader and the motor housing.

[0010] Preferably, the width of the heat spreader is the same as the width of the winding coil.

[0011] Preferably, the heat spreader has an irregular shape and a thermal conductivity greater than 7000 W / (m·K).

[0012] Preferably, the epoxy potting compound has a thermal conductivity greater than 1.4 W / (m·K).

[0013] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0014] 1. This utility model achieves efficient thermal contact between the winding coil and the motor housing by setting a first contouring structure and a second contouring structure on the inner and outer sides of the heat exchange plate, respectively, whose shapes are precisely matched with the winding coil and the inner wall of the housing. Combined with the filling of the gap by potting compound, a vertical heat dissipation channel with low thermal resistance is constructed, which effectively reduces the total thermal resistance from the winding coil to the cooling water channel and greatly improves the heat dissipation efficiency.

[0015] 2. Utilizing the excellent and efficient heat conduction performance of the heat exchanger, the concentrated heat generated by the winding coil under short-term overload, such as when a vehicle is climbing a hill, can be quickly dissipated, which greatly improves the short-term overload capacity of the motor and effectively solves the problems of high temperature alarm and insulation damage caused by this. Attached Figure Description

[0016] The technical solution of this utility model will be further described below with reference to the accompanying drawings:

[0017] Appendix Figure 1 This is a schematic diagram of the high-efficiency heat dissipation structure of a water-cooled flat wire motor according to the present invention.

[0018] Appendix Figure 2 This is a cross-sectional view of a high-efficiency heat dissipation structure for a water-cooled flat wire motor according to the present invention.

[0019] Appendix Figure 3 For the appendix Figure 2 Enlarged view of point A in the middle.

[0020] In the diagram: 1. Motor housing; 11. Cooling water channel; 2. Stator core; 21. Winding coil; 3. Annular cavity; 31. Epoxy potting compound; 4. Heat sink. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0022] As attached Figures 1-3 As shown, the high-efficiency heat dissipation structure of the water-cooled flat wire motor of this utility model includes a motor housing 1, a stator core 2, and a heat dissipation plate 4.

[0023] The motor housing 1 is provided with a cooling water channel 11 for storing a cooling medium, which can be cooling water or cooling oil commonly used in the art.

[0024] The stator core 2 is connected and fixed to the inner wall of the motor housing 1 by interference fit or bolt fixing, so as to ensure that the stator core 2 will not be relatively displaced during motor operation; both ends of the stator core 2 have winding coils 21, which are made of flat wire and are ring-shaped, and an annular cavity 3 is formed between the winding coils 21 and the inner wall of the motor housing 1.

[0025] Multiple heat spreaders 4 are provided, and the multiple heat spreaders 4 are equidistantly arranged in the annular cavity 3. The inner side of each heat spreader 4 has a first conforming structure that matches the winding coil 21. The heat spreader 4 is in close contact with the winding coil 21 through the first conforming structure. The outer side of each heat spreader 4 has a second conforming structure that matches the inner wall of the motor housing 1. The heat spreader 4 is in close contact with the inner wall of the motor housing 1 through the second conforming structure, so as to minimize the gap between the inner and outer sides of the heat spreader 4 and the winding coil 21 and the motor housing 1.

[0026] In this embodiment, the heat spreader 4 has an irregular shape and a thermal conductivity greater than 7000 W / (m·K).

[0027] In this embodiment, there are 18 heat spreaders 4. In actual use, the specific number can be increased or decreased according to the motor power and the size of the winding coil 21.

[0028] During operation, the heat generated by the motor winding coil 21 is first transferred to the heat spreader 4, and then vertically transferred by the heat spreader 4 to the cooling water channel 11 on the motor housing 1. The cooling medium carries away the heat to achieve water cooling of the motor.

[0029] This application uses a high thermal conductivity irregularly shaped heat spreader 4. The inner and outer sides of the heat spreader 4 are respectively provided with a first contour structure and a second contour structure whose shape is precisely matched with the winding coil 21 and the inner wall of the housing, so as to ensure that the heat spreader 4 forms a large area of ​​good contact with the winding coil 21 and the inner wall of the housing, thereby significantly shortening the heat conduction path and improving the heat dissipation efficiency.

[0030] Meanwhile, by utilizing the excellent and efficient heat conduction performance of the heat spreader 4, the concentrated heat generated by the winding coil 21 under short-term overload, such as when a vehicle is climbing a hill, can be quickly dissipated, which greatly improves the short-term overload capacity of the motor and effectively solves the problems of high temperature alarm and insulation damage caused by this.

[0031] Furthermore, the surface of the heat spreader 4 is covered with a layer of polyimide film. The polyimide film has excellent insulation and high temperature resistance properties, which can prevent electrical connection between the heat spreader 4 and the winding coil 21 or the motor housing 1, and ensure the safety of motor operation.

[0032] Furthermore, the width of the heat spreader 4 is the same as the width of the winding coil 21, which maximizes the contact area between the heat spreader 4 and the winding coil 21, thereby further improving heat dissipation efficiency.

[0033] An epoxy potting compound 31 is provided in the annular cavity 3. The epoxy potting compound 31 is used to fill the gap between the winding coil 21, the heat spreader 4 and the motor housing 1. In this embodiment, the thermal conductivity of the epoxy potting compound 31 is greater than 1.4 W / (m·K).

[0034] The use of epoxy potting compound 31 to fill the gaps between the winding coil 21, the heat spreader 4, and the motor housing 1 not only forms a continuous heat conduction path and significantly reduces contact thermal resistance, but also further strengthens the overall insulation protection between the winding coil 21 and the heat spreader 4. Moreover, after the epoxy potting compound 31 cures, it effectively fixes the position of the heat spreader 4, ensuring structural stability.

[0035] The above are merely specific application examples of this utility model and do not constitute any limitation on the scope of protection of this utility model; all technical solutions formed by equivalent transformation or equivalent substitution fall within the scope of protection of this utility model.

Claims

1. A high-efficiency heat dissipation structure for a water-cooled flat wire motor, characterized in that: Include The motor housing (1) has a cooling water channel (11) for storing the cooling medium. Stator core (2), the stator core (2) is connected and fixed on the inner wall of the motor housing (1), and both ends of the stator core (2) have winding coils (21), the winding coils (21) are annular, and an annular cavity (3) is formed between the winding coils (21) and the inner wall of the motor housing (1). A heat spreader (4) is provided, and multiple heat spreaders (4) are equidistantly arranged in the annular cavity (3); the inner side of each heat spreader (4) has a first conforming structure that matches the winding coil (21), and the heat spreader (4) is tightly attached to the winding coil (21) through the first conforming structure; the outer side of each heat spreader (4) has a second conforming structure that matches the inner wall of the motor housing (1), and the heat spreader (4) is tightly attached to the inner wall of the motor housing (1) through the second conforming structure.

2. The high-efficiency heat dissipation structure for a water-cooled flat wire motor according to claim 1, characterized in that: The surface of the heat spreader (4) is covered with a layer of polyimide film.

3. The high-efficiency heat dissipation structure for a water-cooled flat wire motor according to claim 1 or 2, characterized in that: The annular cavity (3) is provided with epoxy potting compound (31), which is used to fill the gap between the winding coil (21), the heat spreader (4) and the motor housing (1).

4. The high-efficiency heat dissipation structure for a water-cooled flat wire motor according to claim 1, characterized in that: The width of the heat spreader (4) is the same as the width of the winding coil (21).

5. The high-efficiency heat dissipation structure for a water-cooled flat wire motor according to claim 1, characterized in that: The heat spreader (4) has an irregular shape and a thermal conductivity greater than 7000 W / (m·K).

6. The high-efficiency heat dissipation structure for a water-cooled flat wire motor according to claim 1, characterized in that: The thermal conductivity of the epoxy potting compound (31) is greater than 1.4 W / (m·K).

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