Salient pole alternator

Smooth cylindrical pure alternator

Projected pole alternator

Impulse turbo alternator

KVA

KW

KVAR

KWH

Must be same

Must be different

Must be low

Must be high

Frequency must be same

Voltage must be different

Sequence must be different

Polarity must be different

To get more voltage

To share more loads

To improve efficiency

To maintain constant frequency