A synchronous motor is an AC electric motor that rotates at the same speed as the rotating magnetic field in the stator. The rotation period of the rotor is equal to the rotating field of the machine it is inside of.  Synchronous motors convert electric energy into mechanical energy and rely on the principle of interaction between the rotating magnetic field of the rotor and stator.  The synchronous speed is the speed of the revolution of the magnetic field in the stator winding of the motor. It is determined by the frequency of the power supply and the number of poles of the... Show more

A synchronous motor is an AC electric motor that rotates at the same speed as the rotating magnetic field in the stator. The rotation period of the rotor is equal to the rotating field of the machine it is inside of. 

Synchronous motors convert electric energy into mechanical energy and rely on the principle of interaction between the rotating magnetic field of the rotor and stator. 
The synchronous speed is the speed of the revolution of the magnetic field in the stator winding of the motor. It is determined by the frequency of the power supply and the number of poles of the machine. 

Here are some features of synchronous motors:
Constant/variable speed
High torque capacity
Easy maintenance
Low operating costs 

A hysteresis motor is a type of synchronous motor that operates both in single and three-phase supply. It has a uniform air gap and without DC excitation.

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