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The torque of a hysteresis motor from standstill to synchronous speed is

  • A.rising steeply as the machine approaches synchronous speed
  • B.falling steeply as the machine approaches synchronous speed
  • C.zero until the machine reaches synchronous speed
  • D.nearly constant

Answer: D

The hysteresis loss per cycle is a property of the material rather than of the slip, so the torque does not vary with speed. It makes the machine ideal for driving a load of high inertia smoothly up to speed, such as a tape reel or a gyroscope.

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