1. The excitation of permanent magnet brushless DC motor is derived from permanent magnet, so it does not need to suck the exciting current from the power grid like the asynchronous motor.
2. The rotor in this motor, because there is no alternating flux, there is no copper consumption and iron consumption. Therefore, the efficiency of the motor is about 10 % higher than the asynchronous motor. In addition, it is also higher than the asynchronous motor in the energy pointer, generally speaking, it can reach 12 % - 20 %.
3.The operation mode of permanent magnet brushless DC motor is automatic control operation. So, it does not need to increase the starting winding when the variable frequency speed regulation is started. And, if the load suddenly changes, there will not be problems such as oscillation or out-of-step.