What is a Synchronous Machine?
Synchronous Machine constitutes of both synchronous motors as well as synchronous generators. An AC system has some advantages over a DC system. Therefore, the AC system is exclusively used for the generation, transmission, and distribution of electric power. The machine which converts mechanical power into AC electrical power is called a Synchronous Generator or Alternator. However, if the same machine can be operated as a motor is known as Synchronous Motor.
Synchronous machine is an AC machine whose satisfactory operation depends upon the maintenance of the following relationship.
Ns is the synchronous speed in revolution per minute (r.p.m)
f is the supply frequency
P is the number of poles of the machine.