Question

Why efficiency of single phase induction motor less compared to similar 3 phase indction motor

Answer 1

Resistance Split-Phase Motor Induction Motor. If an auxiliary winding of much fewer turns of smaller wire is placed at 90o electrical to the main winding, it can start a single phase induction motor. ... This coil produces a moderate starting torque, which is disconnected by a centrifugal switch at 3/4 of synchronous speed ...