phase sequence is reversed

a D.C. source is connected to stator

one phase is open circuited

power is fed back to mains

improving the power factor

improving the starting torque

starting the motor

reducing the harmonics

hoists

rolling mills

mining

refrigerator

wet grinders

food mixies

tape recorders

personal computers as cooling fan

improper size fuses

worn out bearings or low voltage or overload

open circuit in the winding

short circuit in the winding