Synchronous MotorThe counterpart of

Synchronous MotorThe counterpart of a three-phase synchronous generator is a three-phase synchronous motor.Three phase AC current is supplied to the armature winding on the stator to generate a rotating magnetic field in the same way as that in an induction motor. The magnetic field rotates at synchronous speed in the air-gap.And DC current is supplied to the field winding on the rotor by means of a pair of rings and brushes. In order to produce a steady electromechanical torque, the magnetic fields of the stator and rotor must be constant in amplitude and stationary with respect to each other. If asynchronous motor is supplied by a constant AC source, it will operate at a constant steady-state speed.In a motor the electromechanical torque is in the direction of rotation and balances the opposing torque required to drive the mechanical load. The flux produced by currents in armature of a synchronous motor rotates ahead of that produced by the field. This is the opposite of the situation in a synchronous generator. In both generators and motors, an electromechanical torque and a rotational flux are produced. These are the common essential phenomena for AC electromechanical energy conversion devices.