Question

Describe, with the aid of diagrams and phasor/motor graphs, the operation of a 3-ph synchronous motor. In particular describe:

The requirement of the 3-ph ac and dc supplies to owerate

Answer 1

A synchronous motor operates on the principle of magnetic field interaction and requires both AC and DC supplies to power it.

Step-by-step explanation:

A synchronous motor is an AC motor in which the rotation of the rotor is synchronized with the frequency of the applied AC voltage. It operates on the principle of magnetic field interaction. The stator winding produces a rotating magnetic field, which induces an opposing magnetic field in the rotor. The rotor rotates at the same frequency as the stator, resulting in synchronous operation.

To power a 3-phase synchronous motor, both AC and DC supplies are required. The AC supply is required to generate the rotating magnetic field in the stator winding, while the DC supply provides the excitation current to the rotor winding. The AC supply is typically a 3-phase voltage source, while the DC supply is obtained from a separate exciter or an external DC source.