Direct connection from stator

Due to back emf produced in stator

Direct connection to rotor from supply

By the transformer action of stator and rotor

Cascade operation

Changing applied voltage

Changing applied frequency

Changing the number of poles

Copper loss

Friction loss

Hysteresis loss

Eddy current loss

To dry the varnish quickly in winding

To easy flow of varnish in the winding

To increase the insulation resistance value

To drive out the moisture in between winding layers

Ground test

Polarity test

Continuity test

Short circuit test