LOSSES IN AN INDUCTION MOTOR

The major losses in an induction motor are as follows:

1. Stator losses: The losses that occur in the stator of an induction motor are called stator losses.
   1. Stator copper losses:  (per phase)
   2. Stator iron losses: These are the hysteresis and eddy current losses.
2. Rotor losses: The losses that occur in the rotor of an induction motor are called rotor losses.
   1. Rotor copper losses:  (per phase)
   2. Rotor iron losses: Since under normal running condition, rotor frequency is very small. These losses are so small that they are neglected.
3. Mechanical losses: The sum of windage and friction losses is called mechanical losses.