How to solve the problem of the fault the brushless motor controller

Brushless motor controller is a lot of common malfunction. Small make up to say next. Speed and the possible reasons for abnormal processing methods: 1. Reason: high speed may be caused. Processing method to check whether the power supply voltage is too high, the main magnetic field is too weak, and motive load is too little. 2. Reason: maybe it's speed is too low. The armature winding processing method to check, to see whether there is open circuit, short circuit and grounding fault; Check the position of the pressure of the brush and brush; Check whether the field winding circuit work normally. Above is the brushless motor controller fault handling, hope to help everyone.