By cascade operation

By changing the applied voltage

By changing the supply frequency

By changing the number of stator poles

Voltage control

Cascade operation

Pole changing control

Supply frequency control

Equal currents with balanced loads

Different currents with balanced loads

Equal currents with unbalanced loads

Different currents with unbalanced loads

Phase relation

Phase sequence

Single phasing

Phase distortion

Protects the motor by stopping automatically under balanced load

Provides three phase supply in sequence order

Prevents the motor from short circuit fault

Prevent the motor from over load