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A repulsion motor develops torque by

  • A.a capacitor displacing the phase of an auxiliary winding current
  • B.induced currents in a short-circuited rotor winding repelling the stator field
  • C.the interaction of a direct current field winding with the current in its armature
  • D.the sweeping of the field across a shaded pole face

Answer: B

The rotor carries a commutator whose brushes are short-circuited at an angle to the stator axis, and the induced currents produce a torque of repulsion. It gives an excellent starting torque and was widely used before capacitors became cheap.

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