Induction Motor Action

1
Induction Motor Action
2
Look at the magnetic fields established by the
three phases
3
Look at the zero degree condition
The net magnetic field is pointing down
4
Look at the 60 degree condition
The net magnetic field has moved by 60?
5
Look at the 120 degree condition
The net magnetic field has moved another
60? the net field is rotating
counter-clockwise
6
Squirrel-Cage Rotor
7
Effects of the rotating magnetic field on the
rotor
Magnetic field rotates at synchronous speed,
and cuts the rotor bars
8
Induced rotor current and flux
Flux around the rotor bar must be
clockwise Bunching occurs at the right side of
the bar Rotor moves Counter-Clockwise (CCW)