The no-load current of servo motor is unbalanced and the three-phase difference is large
1. Fault cause (1) Winding end-to-end termination error; (2) Unbalanced power supply voltage; (3) There are faults such as short circuit between turns and reverse connection of the coil in the winding. 2. Troubleshooting (1) Check and correct; (2) Measure the supply voltage and try to eliminate the imbalance; (3) Eliminate winding faults.