A polyphase induction motor consists of a polyphase winding embedded in a laminated stator and a conductive squirrel-cage embedded in a laminated rotor. ... Rotor torque is developed as the rotor slips a little behind the rotating stator field. Unlike single-phase motors, polyphase induction motors are self-starting.

What is polyphase induction motors?

: an alternating-current motor having polyphase (as 3-phase) windings.

Is polyphase induction motor said to be a rotating transformer?

A winding that receives its power exclusively by induction constitutes a transformer. ... An induction motor carries alternating current in both the stator and the rotor windings. An induction motor is a rotating transformer in which the secondary winding receives energy by induction while it rotates.