Full water cooling structure of permanent magnet synchronous motor of electric automobile

Abstract

The utility model discloses a full water cooling structure of a permanent magnet synchronous motor of an electric automobile, a casing is connected with a bearing chamber through a casing end cover, a spiral water channel is arranged in the casing, and a water inlet and a water outlet are arranged on the outer side of the spiral water channel; a bearing is installed in the bearing chamber and connected with the bearing chamber front end cover and the bearing chamber rear end cover, a hollow shaft provided with a water way is connected with the bearing chamber, a heat dissipation water way is formed in the machine shell end cover, and a cooling medium forms a closed cooling path through the water inlet, the water outlet, the machine shell, the machine shell end cover, the bearing chamber and the hollow shaft. According to the utility model, the casing is connected with the bearing chamber and the hollow shaft through the casing end cover to form a closed waterway structure in which the casing is communicated with the bearing, and heat generated in the bearing, the hollow shaft and the motor is taken away through the flowing of cooling liquid; cooling liquid is immersed in the bearing chamber, so that the heat dissipation capability of the bearing is improved; the heat dissipation water channel is arranged in the casing end cover and is directly connected with the bearing chamber, heat in the motor is dissipated through the casing end cover, and the overall heat dissipation capability of the motor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of permanent magnet synchronous motors for electric vehicles, in particular to a full water cooling structure of a permanent magnet synchronous motor for electric vehicles. Background Art

[0002] Since permanent magnet synchronous motors for electric vehicles need to operate efficiently in a wide range of speeds and the drive system space is limited, permanent magnet motors for electric vehicles are developing towards high power density. As the power density increases, the unit heat load of the motor increases, resulting in excessive temperature rise. The existing technology uses casing water cooling and hollow shaft oil spray cooling to cool the motor, but due to the high speed of the motor, the bearing heats up severely and the failure rate is high. In addition, the bearing is installed on the front cover of the motor. The heat generated at the end of the motor winding is relatively high and interacts with the heat of the bearing, reducing the heat dissipation capacity of the motor end and the bearing, affecting the safe operation of the motor. Utility Model Content

[0003] In order to solve the above problems, the utility model provides a full water cooling structure of a permanent magnet synchronous motor of an electric vehicle.

[0004] In order to solve the above technical problems, the technical solution of the utility model is: a full water-cooling structure of a permanent magnet synchronous motor of an electric vehicle, including a casing, which is connected to a bearing chamber through a casing end cover, a spiral water channel is provided in the casing, and a water inlet and a water outlet are provided on the outside of the spiral water channel; a bearing is installed in the bearing chamber, the bearing is connected to the front end cover of the bearing chamber and the rear end cover of the bearing chamber, a hollow shaft with a water channel is connected to the bearing chamber, a heat dissipation water channel is opened inside the casing end cover, and the cooling medium forms a closed cooling path through the water inlet, the water outlet, the casing, the casing end cover, the bearing chamber, and the hollow shaft.

[0005] Furthermore, the casing and the casing end cover are fixed by a sealing plate and bolts.

[0006] Furthermore, the bearing is fastened to the front end cover of the bearing chamber and the front sealing ring pressure plate by screws.

[0007] Furthermore, the rear end cover of the bearing chamber and the rear sealing ring pressure plate are fastened by screw two.

[0008] Furthermore, the casing end cover is connected to the bearing chamber by bolt 2.

[0009] The casing of the utility model is connected with the bearing chamber and the hollow shaft through the casing end cover, forming a closed water channel structure in which the casing is connected with the bearing, and the heat generated by the bearing, the hollow shaft and the motor is taken away by the flow of coolant; the bearing chamber is immersed in coolant, which greatly improves the heat dissipation capacity of the bearing; a heat dissipation water channel is provided inside the casing end cover and is directly connected to the bearing chamber, and the heat inside the motor is dissipated through the casing end cover, further improving the overall heat dissipation capacity of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the structure of the utility model.

[0011] Among them: 1. Casing; 2. Spiral water channel; 3. Bolt 1; 4. Sealing plate; 5. Casing end cover; 6. Heat dissipation water channel; 7. Front cover of bearing chamber; 8. Bolt 2; 9. Front sealing ring pressure plate; 10. Bearing chamber; 11. Screw 1; 12. Bearing; 13. Screw 2; 14. Rear sealing ring pressure plate; 15. Rear cover of bearing chamber; 16. Hollow shaft; 17. Water channel; 18. Water inlet; 19. Water outlet. DETAILED DESCRIPTION

[0012] The following is combined with Figure 1 The specific implementation methods of the utility model are further described.

[0013] The full water-cooling structure of the permanent magnet synchronous motor of an electric vehicle includes a casing 1, which is connected to a bearing chamber 10 through a casing end cover 5, and the casing 1 and the casing end cover 5 are fixed by a sealing plate 4 and a bolt 3, and the casing end cover 5 is connected to the bearing chamber 10 through a bolt 8, and a spiral water channel 2 is provided in the casing 1, and a water inlet 18 and a water outlet 19 are provided on the outer side of the spiral water channel 2; a bearing 12 is installed in the bearing chamber 10, and the bearing 12 is connected to the front end cover 7 of the bearing chamber and the rear end cover 15 of the bearing chamber, and the bearing 12 is fastened to the front end cover 7 of the bearing chamber and the front sealing ring pressure plate 9 by a screw 11, and the rear end cover 15 of the bearing chamber is fastened to the rear sealing ring pressure plate 14 by a screw 2 13, and a hollow shaft 16 provided with a water channel 17 is connected to the bearing chamber 10, and a heat dissipation water channel 6 is opened inside the casing end cover 5, and the cooling medium forms a closed cooling path through the water inlet 18, the water outlet 19, the casing 1, the casing end cover 5, the bearing chamber 10, and the hollow shaft 16.

[0014] The casing 1 is provided with a spiral water channel 2 inside. The coolant flows in through the water inlet 18, circulates in the spiral water channel 2, and flows out from the water outlet 19, forming a circulating water channel 1 to take away the heat inside the motor, playing a role in cooling and dissipating the heat inside the motor. The casing end cover 5 is fixed at both ends of the casing 1, and penetrates into the bearing chamber 10 to connect with it. The bearing chamber 10 is directly connected to the hollow shaft 16 with a water channel 17. The coolant flows into the water inlet 18 through the heat dissipation water channel 6 inside the casing end cover 5, and the bearing chamber 10 and the hollow shaft 16 finally flow out from the water outlet 19, forming a circulating water channel 2 to take away the heat from the bearing 12 and the motor end, playing a role in cooling and dissipating the heat from the bearing 12 and the motor end. At the same time, the cooling medium in the casing end cover 5 can take away most of the heat generated by the motor winding end, preventing the temperature rise of the motor end from affecting the bearing 12.

[0015] The above is only a preferred specific implementation method of the utility model, but the protection scope of the utility model is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the utility model, according to the technical scheme and utility model concept of the utility model, shall be covered by the protection scope of the utility model.

Claims

1. The permanent magnet synchronous motor of electric vehicle has a full water cooling structure, characterized in that: The invention comprises a casing (1), wherein the casing (1) is connected to a bearing chamber (10) via a casing end cover (5), a spiral water channel (2) is provided in the casing (1), and a water inlet (18) and a water outlet (19) are provided on the outer side of the spiral water channel (2); a bearing (12) is installed in the bearing chamber (10), the bearing (12) is connected to a front end cover (7) of the bearing chamber and a rear end cover (15) of the bearing chamber, a hollow shaft (16) provided with a water channel (17) is connected to the bearing chamber (10), a heat dissipation water channel (6) is provided inside the casing end cover (5), and a cooling medium forms a closed cooling path through the water inlet (18), the water outlet (19), the casing (1), the casing end cover (5), the bearing chamber (10), and the hollow shaft (16).

2. The full water cooling structure of the permanent magnet synchronous motor of an electric vehicle according to claim 1 is characterized in that: The casing (1) and the casing end cover (5) are fixed via a sealing plate (4) and bolts (3).

3. The full water cooling structure of the permanent magnet synchronous motor of an electric vehicle according to claim 1 is characterized in that: The bearing (12) is fastened to the front end cover (7) of the bearing chamber and the front sealing ring pressure plate (9) by means of screws 1 (11).

4. The full water cooling structure of the permanent magnet synchronous motor of an electric vehicle according to claim 1 is characterized in that: The rear end cover (15) of the bearing chamber and the rear sealing ring pressure plate (14) are fastened by screws (13).

5. The full water cooling structure of the permanent magnet synchronous motor of an electric vehicle according to claim 1 is characterized in that: The casing end cover (5) is connected to the bearing chamber (10) via bolt 2 (8).

Images