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Troubleshooting of electric vehicle motor not turning
- Aug 21, 2018 -

When some electric vehicles do fault detection, they find that the motor does not turn and the instrument panel shows normal phenomenon. How should we correct it correctly?

1. First check whether there is a short circuit at the beginning of the speed control switch and the motor Hall. Generally, it is more likely to cause short circuit of the joint after rain and damp. Therefore, it is necessary to pay attention to the waterproof joint. If the controller is damaged, it should be checked first before replacing the new controller. Is it short-circuited with the motor Hall switch, otherwise the replacement controller will be continuously damaged.


2. Unplug the brake lever socket (normally open brake lever). If the motor is running, it is a brake failure and the brake lever should be replaced.


3. Detect the Hall signal line of the electric vehicle motor separately, and slowly rotate the motor by hand. The voltage of each phase should be changed between 0 and 5V. If the voltage is not changed, the motor Hall is damaged. The motor or motor Hall element should be replaced. . If the voltage of each phase changes normally and the power supply is normal, the controller is damaged and the controller is replaced.


4. Turn the source 5V voltage to normal, detect the turn signal voltage, turn the turn, and the signal voltage should change from low to high at 0.8~4.2V. If there is no change in voltage and less than 1V, there is a short circuit in the fault of the switch or the switch wire. If the voltage is greater than 1V and the change is normal, the motor Hall signal (yellow, green, blue lines) is detected. If the three-phase Hall signal line voltage is all 5V and the contact is good, the motor Hall is damaged, and the motor or motor Hall element should be replaced.


5. Detect the Hall signal line of the electric vehicle motor separately and slowly rotate the motor by hand. The voltage of each phase should be changed between 0 and 5V. If there is no change in voltage, the Hall of the motor is damaged. The motor or motor Hall element should be replaced. . If the voltage of each phase changes normally and the power supply is normal, the controller is damaged and the controller is replaced.


6. Use a multimeter to detect the voltage at the input end of the controller's power supply. The voltage should be greater than 36V (the battery is fully charged). If there is no voltage, check the input line. Check the controller to turn the power supply voltage (connected to the red and black lines of the switch), the normal voltage is 5 ~ 6V, if there is no 5V voltage, unplug the switch socket, the voltage is restored to 5V, it may be short circuit of the motor Hall element, such as If there is still no 5V voltage, the controller is faulty and the controller should be replaced.


7. If the motor does not turn, focus on checking the motor Hall switch and the turn signal. If the power is on, the controller casing is very hot. Generally, the internal power tube of the controller is short-circuited, and the power should be cut off immediately.

The electric vehicle motor does not need to be professionally repaired to solve the problem, and the user is required to strengthen the daily maintenance during the use of the electric vehicle.