Air-cooled motor

Abstract

The utility model provides an air cooling motor, which comprises a motor assembly and an inner air cooling pipeline which are arranged inside a vehicle axle housing, and an outer air cooling pipeline which is arranged outside the axle housing, the motor assembly comprises a rotor, a stator, a motor housing and a rear end cover, and a plurality of rotor ventilation holes are arranged along the axial direction of the rotor in a penetrating manner. One end of the inner air cooling pipeline is communicated with the outer air cooling pipeline through an axle housing hole, the other end of the inner air cooling pipeline is communicated with an air inlet in the rear end cover, the air inlet is communicated with the rotor ventilation hole, and a motor shell air outlet is formed in the side, away from the rear end cover, of the motor shell. And hot air after heat exchange of the rotor ventilation hole is discharged through the motor shell air outlet. The defects that in the prior art, under the condition that the working condition is harsh or the arrangement space is small, the heightening ribs enable the size of the motor to be increased, and normal installation of the motor is affected can be overcome.

Description

Technical Field

[0001] The utility model relates to the technical field of drive motor assemblies, in particular to an air-cooled motor. Background Art

[0002] The drive motor of the electric wheel mining axle will release a lot of heat during operation. If the heat cannot be effectively dissipated, the internal temperature of the drive motor will rise, causing motor failure or even burning, seriously affecting the safety and normal operation of the vehicle. Usually, the heat dissipation structure of the air-cooled motor is to set multiple heat dissipation ribs outside the motor housing to transfer the heat of the motor to the heat dissipation ribs, and then transfer the heat of the motor to the heat dissipation ribs through the heat dissipation ribs to the environment to achieve the purpose of cooling. Therefore, the area of ​​the heat dissipation ribs is positively correlated with the heat dissipation effect. However, for harsh working conditions or small layout space, increasing the ribs will increase the size of the motor, which may cause interference during installation. Therefore, how to design a reasonable air-cooled motor and cooling system is an important prerequisite for ensuring the safe and reliable operation of the mine car. Utility Model Content

[0003] Therefore, the utility model provides an air-cooled motor, which can overcome the defects in the prior art that increasing the height of the ribs will increase the size of the motor and affect the normal installation of the motor when the working conditions are relatively harsh or the layout space is small.

[0004] In order to solve the above problems, the utility model provides an air-cooled motor, including a motor assembly and an inner air-cooling duct arranged inside a vehicle bridge housing, and an outer air-cooling duct located outside the bridge housing. The motor assembly includes a rotor, a stator, a motor housing and a rear end cover. A plurality of rotor ventilation holes are arranged axially through the rotor. One end of the inner air-cooling duct is connected to the outer air-cooling duct through the bridge housing hole, and the other end is connected to the air inlet on the rear end cover. The air inlet is connected to the rotor ventilation hole. A motor housing air outlet is provided on the side of the motor housing away from the rear end cover, and the hot air after heat exchange through the rotor ventilation hole is discharged through the motor housing air outlet.

[0005] In some embodiments, the inner air-cooling pipe is a curved pipe.

[0006] In some embodiments, the air inlet of the external air cooling duct is arranged toward the forward direction of the vehicle, and the angle between the air inlet and the horizontal plane is 25° to 35°.

[0007] In some embodiments, radial cross-sections of the outer air-cooling pipe and the inner air-cooling pipe are both circular cross-sections at both ends and square cross-sections in the middle.

[0008] In some embodiments, a gap air duct is formed between the rotor and the stator, and the radial distance of the gap air duct is 1-3 mm.

[0009] In some embodiments, a plurality of motor housing air outlets are provided along the circumference of the motor housing.

[0010] In some embodiments, a plurality of plate ribs staggered in transverse and longitudinal directions are provided on the inner surface of the bridge housing, and rectangular holes are provided on the transverse plate ribs.

[0011] In some embodiments, the axle housing is provided with an axle housing air outlet, and the hot air after heat exchange is discharged from the axle housing through the axle housing air outlet, and the axle housing air outlet is connected to a vehicle heat demand device.

[0012] In some embodiments, a plurality of plate ribs are axially arranged on the inner wall of the motor housing.

[0013] The utility model provides an air-cooled motor. The rotor ventilation holes on the rotor and the air ducts in the installation gap between the rotor and the stator can evenly dissipate heat from the internal parts of the motor. At the same time, the overall structure of the air cooling system is compact, and there is no heat sink on the outside, which greatly saves space. The hot air blown out of the bridge housing can achieve energy recycling. The outer air cooling duct is set with a certain inclination angle toward the direction of the vehicle's travel, which can effectively prevent dust and other debris from entering. The inner and outer air cooling ducts are set with an outer circle and an inner square structure to increase the air intake and achieve a rapid cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of an air-cooled motor according to an embodiment of the utility model;

[0015] Figure 2 A schematic diagram of the internal air duct of the air-cooled motor of an embodiment of the utility model;

[0016] Figure 3 This is an enlarged schematic diagram of point A of the air-cooled motor of the embodiment of the utility model;

[0017] Figure 4 This is a schematic diagram of the motor housing structure of an air-cooled motor according to an embodiment of the utility model;

[0018] Figure 5 A schematic diagram of a motor assembly of an air-cooled motor according to an embodiment of the utility model;

[0019] Figure 6 This is a schematic diagram of the bridge housing structure of an air-cooled motor according to an embodiment of the utility model;

[0020] Figure 7 This is a schematic diagram of the air cooling flow direction of the air-cooled motor according to an embodiment of the utility model.

[0021] The reference numerals are as follows:

[0022] 1. External air cooling duct; 2. Bridge housing; 3. Plate rib air outlet; 4. Internal air cooling duct; 5. Bridge housing air outlet; 11. Rear end cover; 12. Motor shaft; 13. Rotor; 14. Rear end ring; 15. Stator; 16. Front end ring; 17. Wire row; 18. Front end cover; 19. Motor housing; 20. Motor housing air outlet; 21. Rotor ventilation hole; 22. Gap air duct; 23. Air inlet. DETAILED DESCRIPTION

[0023] See also Figures 1 to 7 As shown, according to an embodiment of the utility model, an air-cooled motor is provided, comprising a motor assembly and an inner air-cooling duct 4 arranged inside a vehicle bridge housing 2, an outer air-cooling duct 1 located outside the bridge housing 2, the motor assembly comprising a rotor 13, a stator 15, a motor housing 19 and a rear end cover 11, a plurality of rotor ventilation holes 21 are arranged axially through the rotor 13, one end of the inner air-cooling duct 4 is connected to the outer air-cooling duct through the bridge housing hole, and the other end is connected to the air inlet 23 on the rear end cover 11, the air inlet 23 is connected to the rotor ventilation hole 21, a motor housing air outlet 20 is arranged on the side of the motor housing 19 away from the rear end cover 11, and the hot air after heat exchange in the rotor ventilation hole 21 is discharged through the motor housing air outlet 20. The rotor ventilation holes 21 provided on the rotor 13 and the installation gap air duct 22 between the rotor 13 and the stator 15 can evenly dissipate heat from the internal parts of the motor. The cold air enters the internal air cooling duct 4 through the external air cooling duct 1, and then is sent to the rotor ventilation holes 21 on the motor rotor 13 through the air inlet 23. After the cold air passes through the rotor 13, it takes away the heat and cools the motor. At the same time, the overall structure of the air cooling system is compact, and there is no heat sink on the outside, which greatly saves space.

[0024] Specifically, the motor assembly also includes a motor shaft 12, a coil row 17, a front end ring 16, and a rear end ring 14. The front end cover 18 and the rear end cover 11 are respectively arranged on both sides of the motor housing 19 and fastened by bolts. The front end ring 16 and the rear end ring 14 are arranged on both sides of the rotor 13.

[0025] Specifically, the rotor ventilation holes 21 are provided with two circles. According to the diameter of the rotor 13, as many rotor ventilation holes as possible are provided without affecting the strength of the parts. It is more reasonable to provide two circles, the cold air contact surface is larger, and the temperature drops quickly.

[0026] In a specific embodiment, the inner air-cooling pipe 4 is an arc-shaped pipe.

[0027] In a specific embodiment, the air inlet of the external air cooling duct 1 is arranged toward the vehicle's forward direction, with an angle of 25° to 35° with the horizontal plane. The external air cooling duct 1 is arranged with a certain inclination angle toward the vehicle's forward direction, which can effectively prevent dust and other debris from entering.

[0028] In a specific embodiment, the radial cross-sections of the outer air cooling pipe 1 and the inner air cooling pipe 4 are both circular cross-sections at both ends and square cross-sections in the middle. The cross-sectional area of ​​the circular pipe is relatively large, and the cross-sectional area of ​​the square pipe is relatively small. When the cold air blows in, the wind pressure remains unchanged, and the wind speed at the square pipe is greater than that at the circular pipe. This structural design cools down quickly.

[0029] In a specific embodiment, a gap air duct 22 is formed between the rotor 13 and the stator 15, and the radial distance of the gap air duct 22 is 1-3 mm. The distance setting of the gap air duct 22 can ensure convenient processing and installation, and will not affect the torque size of the induced electromotive force, which is more reasonable.

[0030] In a specific embodiment, a plurality of motor housing air outlets 20 are provided along the circumference of the motor housing 19. The plurality of motor housing air outlets 20 are provided around the motor housing 19 to increase the air volume and quickly discharge the hot air from the motor housing 19.

[0031] Specifically, the motor housing air outlet 20 is circular, rectangular or other shapes.

[0032] In a specific embodiment, the inner surface of the bridge housing 2 is provided with a plurality of plate ribs arranged in a crisscross pattern, and rectangular holes are arranged on the transverse plate ribs. The bridge housing 2 generally bears a relatively large load, and the transverse distribution design (i.e., the crisscross plate ribs) reduces stress concentration and improves the strength of the bridge housing.

[0033] In a specific embodiment, the bridge housing is provided with a bridge housing air outlet 5, and the hot air after heat exchange is discharged from the bridge housing 2 through the bridge housing air outlet 5, and the bridge housing air outlet 5 is connected to the automobile heat demand device. The hot air discharged from the bridge housing air outlet 5 is directed to the automobile heat demand device, and the heat energy is recycled, and the blown hot air is used for heating. For example, the automobile heat demand device can be a heater core, a water valve, etc., which are more commonly used in severe cold weather conditions. In addition, the motor air ducts are close to the inside of the motor. After the hot air after heat exchange is discharged from the bridge housing 2, it enters the gap between the bridge housing 2 and the motor housing 19, which can take away a part of the high-temperature gas outside the motor, thereby enhancing the cooling effect.

[0034] In a specific embodiment, a plurality of plate ribs are axially arranged on the inner wall of the motor housing 19 .

[0035] Running process:

[0036] When the motor generates heat during operation, the motor cooling system starts, and the forced cooling system blows cold air into the external air cooling duct 1. The cold air enters the motor through the internal air cooling duct 4 and the rear end cover air inlet 23 on the rear end cover 11. Under the action of air pressure, the cold air flows from the rear end cover 11 along the rotor ventilation holes 21 and the gap air duct 22 on the rotor to the side of the front end cover 18, taking away the heat generated inside the motor to form hot air. The hot air flows out from the motor housing outlet 20, flows through the gap between the motor housing 19 and the bridge housing 2, and is finally discharged from the bridge housing outlet 5. At the same time, the discharged hot air can heat other components and equipment.

[0037] The above is only a preferred embodiment of the utility model, and is not intended to limit the utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the utility model should be included in the protection scope of the utility model. The above is only a preferred implementation of the utility model. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the utility model, and these improvements and variations should also be regarded as the protection scope of the utility model.

Claims

1. An air-cooled motor, characterized in that: The invention comprises a motor assembly and an inner air cooling pipe (4) arranged inside a vehicle bridge housing (2), and an outer air cooling pipe (1) located outside the bridge housing (2); the motor assembly comprises a rotor (13), a stator (15), a motor housing (19) and a rear end cover (11); a plurality of rotor ventilation holes (21) are arranged along the axial direction of the rotor (13); one end of the inner air cooling pipe (4) is connected to the outer air cooling pipe through the bridge housing hole, and the other end is connected to an air inlet (23) on the rear end cover (11); the air inlet (23) is connected to the rotor ventilation hole (21); a motor housing air outlet (20) is arranged on a side of the motor housing (19) away from the rear end cover (11); hot air after heat exchange in the rotor ventilation hole (21) is discharged through the motor housing air outlet (20).

2. The air-cooled motor according to claim 1, characterized in that: The inner air cooling pipe (4) is an arc-shaped pipe.

3. The air-cooled motor according to claim 1, characterized in that: The air inlet of the external air cooling pipe (1) is arranged towards the forward direction of the vehicle, and has an angle of 25° to 35° with the horizontal plane.

4. The air-cooled motor according to claim 1, characterized in that: The radial cross-sections of the outer air cooling pipe (1) and the inner air cooling pipe (4) are both circular cross-sections at both ends and square cross-sections in the middle.

5. The air-cooled motor according to claim 1, characterized in that: A gap air duct (22) is formed between the rotor (13) and the stator (15), and the radial distance of the gap air duct (22) is 1 to 3 mm.

6. The air-cooled motor according to claim 1, characterized in that: A plurality of motor housing air outlets (20) are arranged along the circumference of the motor housing (19).

7. The air-cooled motor according to claim 1, characterized in that: The inner surface of the bridge housing (2) is provided with a plurality of plate ribs that are staggered in transverse and longitudinal directions, and rectangular holes are provided on the transverse plate ribs.

8. The air-cooled motor according to claim 1, characterized in that: The axle housing is provided with an axle housing air outlet (5), and the hot air after heat exchange is discharged from the axle housing (2) through the axle housing air outlet (5), and the axle housing air outlet (5) is connected to a heat demand device of an automobile.

9. The air-cooled motor according to claim 1, characterized in that: A plurality of plate ribs are axially arranged on the inner wall of the motor housing (19).

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