Power Stages in an Induction Motor

input to motor.JPG


When an induction motor is operating normally, the slip is so small that the frequency of the magnetic reversals in the rotor core is only of the order of one or two per sec, therefore iron losses occurring the rotor are very small and can be neglected. Hence output of stator = input to rotor = output of rotor + copper losses in rotor and rotor copper losses are given as

Rotor copper losses = S  input power to rotor                         

Rotor efficiency, ηR = Rotor Output/Rotor Input = N/Ns = 1 - s                                       


It is new unit of torque and is defined as the torque which develops a power of 1 watt at the synchronous speed of the motor. When we say that the motor is developing a torque of 100 synchronous watts, we mean that the rotor input is 100 watts and that the torque is such that the power developed would be 100 watts provided the rotor is running synchronously and developing the same torque.           

Tsy       =   Rotor input in walts/2πNs                                        More Q&A

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