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The usual way of starting a large wound field synchronous motor from a fixed supply is

  • A.induction starting on its damper winding
  • B.connecting the field winding directly to the supply at standstill
  • C.driving the machine up to speed with a mechanical clutch from another shaft
  • D.applying reduced voltage to the stator winding until it locks in

Answer: A

Bars in the pole faces act as a cage rotor and bring the machine up to near synchronous speed, at which point the field is applied and the rotor pulls into step. The field must be short-circuited or shorted through a resistance during that run-up.

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