Synchronous vs. Asynchronous Servo Motors Check out the full blog post over at https://realpars.com/servo-motor/ AC motors are more often differentiated by the speed of their rotating synchronous or asynchronous field. In a synchronous motor, the rotor rotates at the same speed as the stator’s rotating magnetic field. In an asynchronous motor, the rotor rotates at a speed slower than the stator’s rotating magnetic field. The speed of an asynchronous motor can be varied utilizing several control