ABSTRACT
The chapter focusses on the operation of a three-phase induction motor that explains the operation of a single-phase induction motor. The key requirement for the induction motor is the creation of a rotating main field. The induction motor behaves like a three-phase transformer with the stator windings, equivalent to the transformer's primary windings and the rotor bars, equivalent to its secondary windings. It is classified according to the shape of their torque curves, where torque is proportional to both rotor current and power factor. A synchronous motor's three-phase stator windings set up a magnetic field that naturally rotates at synchronous speed, just similar to the three-phase induction motor. The chapter deals with the 'skin effect' which describes how alternating current tends to travel towards the surface of a conductor. It also reduces the effective cross-sectional area which raises the resistance of a conductor.
