Construction of Three Phase Synchronous Motor

Construction of Three Phase Synchronous Motor

Similar to d.c. machine where there is no constructional difference between a generator and motor, there is no difference between the construction of synchronous motor and the alternator, both being the synchronous machines.

The synchronous motor construction is basically similar to rotating field type alternator. It consists of two parts :

i) Stator : Consisting of a three phase star or delta connected winding. This is excited by a three phase a.c. supply.

ii) Rotor : Rotor is a field winding, the construction of which can be salient (projected pole) or non salient (cylindrical) type. Practically most of the synchronous motors use salient i, winding is excited by a separate d.c. suppily through slip rings.

Review Question

1. Explain the construction of three phase synchronous motor.