The motor of an electric vehicle is the source of its power. If the motor fails, even if it can still run normally, it will cause some damage to other components. Electric vehicle manufacturers will introduce the common faults and causes of electric vehicle motors.

The motor of an electric vehicle is usually not completely silent, but the noise of the motor has a certain limit. There can be no metal collision, marble squeeze, friction noise, uniform electromagnetic noise is allowed, and the diagnosis of electric vehicle noise When appropriate, electric vehicle manufacturers recommend monitoring on the motor shaft through a hollow metal listening rod. If the motor has abnormal noise, it should be faulty and should be repaired in time.

A common fault of the motor is demagnetization. The method recommended by electric vehicle manufacturers to detect demagnetization is to check the motor's no-load current and mechanical wear loss. If the current increases, the motor's no-load speed will increase. Generally speaking, the demagnetization phenomenon is more obvious. .

Consumers can also inspect the actual operating efficiency of the motor by detecting the load current of the motor. If the load current increases but the actual torque is small, the motor efficiency is very low. It is necessary to check the magnetic energy product of the magnet and the welding inside the coil. Firmness should also be paid attention to; if it is a brush motor, it is necessary to check whether the commutator has a short circuit.