Excess temperature protector for driving motor of electric automobile

Abstract

The invention is an electric auto driving motor cooling fun protector, according to the working current range, determining if the cooling fan works normally: if it is abnormal, send trouble information to an motor controller, which can stop the driving motor working or reduce output power of the driving motor, thus preventing overtemperature damage, even destruction to the driving motor caused by the abnormal working of the cooling fan, and the invention can be used not only in protecting electric auto driving motor but also in protecting other driving motors in need of cooling fans.

Description

technical field [0001] The invention relates to an over-temperature protector for a drive motor of an electric vehicle, in particular to an over-temperature protector for an external air-cooled drive motor of an electric vehicle. Background technique [0002] There are two cooling methods for the air-cooled electric vehicle drive motor. One is self-air cooling. The cooling fan in this air-cooling method is installed on the shaft of the drive motor, and the fan blades of the fan rotate as the rotor of the drive motor rotates. Rotation, the speed is the same as the motor rotor speed, the other is the external air cooling method, the cooling fan of this method is generally powered by the 24V or 12V DC low-voltage power supply on the vehicle, which overcomes the self-air cooling method. The disadvantage of poor cooling effect is widely used. For the over-temperature protection of the drive motor of the external air-cooled electric vehicle, the current technology mainly adopts th...

AI Technical Summary

Problems solved by technology

[0002] There are two cooling methods for the drive motor of air-cooled electric vehicles. One is the self-air cooling method. The cooling fan of this air-cooling method is installed on the shaft of the drive motor, and the blades of the fan rotate with the rotor of the drive motor. The rotation speed is the same as that of the motor rotor. The other is the external air cooling method. The cooling fan of this method is generally powered by the 24V or 12V DC low-voltage power supply on the car, which overcomes the self-air cooling method when the cooling fan drives the motor at low speed. The disadvantage of poor cooling effect, so it is widely used. For the over-temperature protection of the drive motor of the external air-cooled electric vehicle, the current technology mainly uses the motor temperature detection method, that is, to detect the temperature signal of the temperature sensor installed on the drive motor. , when the temperature signal is too high, the motor controller will stop the drive motor and realize the over-temperature protection of the drive motor. For example, the drive motor and its control system provided by Zhuzhou Times Group for the 15th 863 electric vehicle project use this kind of motor Over-temperature protection mode, this kind of over-temperature protection of the drive motor has serious shortcomings. The temperature sensor installed on the drive motor can only detect the temperature of one or several temperature points on the motor stator, and the detected temperature points are limited. , it is also difficult to detect the temperature on the motor rotor, so it cannot protect the local over-temperature of the motor

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