For electric vehicles, asynchronous motors are durable, have strong overload capacity, and are so mature in control algorithms that they can be used. Three-phase AC motor – speed regulation of synchronous motor Speed ​​regulation of synchronous motor: synchronous motor has no slip rate. In the case of a certain structure, the control voltage cannot change the speed, so before the appearance of the frequency converter, the synchronous motor cannot be adjusted at all. fast. The appearance of the frequency converter has given the AC synchronous motor a huge speed regulation range. Because the rotor also has independent excitation (permanent magnet or electric excitation), its speed regulation range is wider than that of the asynchronous motor, and the synchronous motor is full of new vitality.