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
D.C. shunt motor
D.C. series motor
single phase induction motor
synchronous motor