The main difference between synchronous motor and asynchronous motor is that synchronous motor can rotate with its stator magnetic field to achieve synchronous speed, and asynchronous motor speed can not reach the synchronous speed of stator magnetic field.
Synchronous and crossover machines, both AC Motors, use one of the more interesting features of three-phase alternating current: simply put, if the three coils are arranged like a blender(that is, the kind of thing used to beat eggs in the home), the three coils are not in contact with each other. Adding the three-phase voltage of a a-bc, respectively, creates a three-phase current, and then something funny happens. A rotating magnetic field with the same frequency as the voltage is added appears in the space enclosed by the coil(if you want to explain it in more depth, It must be said that the decomposition, superposition, and trouble of standing waves). So people insert the coil into the stator according to the above method, and the space where the rotor is located generates a rotating magnetic field.
