Synchronous motor is an AC motor, working on speed fixed frequency of the system. These motors require Direct Current (DC) for excitation and have a low starting torque, and therefore synchronous motor suitable for use beginning with low load, such as air compressors, frequency changes and the motor generator.
Synchronous motor is able to correct the power factor of the system, so often used in systems that use a lot of electricity.
The main components of a synchronous motor are:
Rotor. The main difference between synchronous motors with induction motor is that the rotor synchronous machine running at the same speed as the rotating magnetic field. This is possible because the magnetic field of the rotor is no longer induced.
The rotor having permanent magnets or DC-excited, which forced to lock in a certain position when confronted with another magnetic field.
Stator. Stator produces a rotating magnetic field, which is proportional to the frequency supplied.