Basic Electronics and Electrical Engineering: Chapter 5: Induction Motors
Power Stages in an Induction Motor
The various stages of energy transformation in an induction motor.
POWER
STAGES IN AN INDUCTION MOTOR
The various stages of
energy transformation in an induction motor and also various losses occurring
in it are shown in the flow diagram of Fig. 5.20.
The various losses
during this energy conversion are:
1. Fixed losses
(i) Stator Iron loss
(ii) Friction and windage loss.
Stator iron loss
consists of eddy current and hysteresis losses. These losses depends on the
supply frequency and the flux density in the iron core. It is practically
constant. The rotor iron loss is negligible because the frequency of rotor
current under normal running condition is 'small.
2. Variable losses
(i) Stator Cu loss
(ii) Rotor Cu loss
The following points
may be noted from the power flow diagram.
(a) Stator input, Pi
= Stator output + Stator losses
= Stator output + Stator Iron loss + Stator Cu
loss
(b) Rotor input, Pr
= Stator output
(c) Mechanical power, Pm
= Rotor input ‒ Rotor cu loss
= Pr ‒ Rotor
Cu loss
This mechanical power
available is the gross rotor output and will produce a gross torque Tg.
(d) Mechanical power at
shaft, Pout = Pm ‒ Friction and windage loss.
Mechanical power
available at the shaft produces a shaft torque Tsh
Pm‒Pout Friction and
windage loss
Basic Electronics and Electrical Engineering: Chapter 5: Induction Motors : Tag: Basic Engineering : - Power Stages in an Induction Motor
Basic Electronics and Electrical Engineering: Chapter 5: Induction Motors
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