The permanent magnet brushless DC motor is turned on and off according to a certain rule by the inverter power tube during use, so that the motor stator armature generates a magnetic potential that continuously advances at an electrical angle of 60°, and the rotation of the motor rotor is realized. The permanent magnet brushless DC motor is the opposite potential and current of the armature under ideal conditions. Each power tube conducts 120° electrical angle with 60° electrical angle. When the power tubes V3 and V4 are turned on, the motor V And -U (current flowing into the winding direction is positive).
The magnetic potential generated by the stator armature of the permanent magnet brushless DC motor will continuously turn on and off with the power tube regularly, and continuously rotate clockwise at an electrical angle of 60°. The inverter power tube has six starting combination states, and each of the starting combination states corresponds to the determined rotor position or the generator motor waveform to generate the maximum average electromagnetic torque. When the angle between the two magnetic potential vectors is 90°, the interaction force is the largest.
The magnetic potential generated by the electronic armature of the permanent magnet brushless DC motor is advanced at an electrical angle of 60°. Therefore, in each of the starting modes, the angle between the rotor magnetic potential and the stator magnetic potential can be varied from 60° to 120°. Produces the largest average electromagnetic torque.