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  1. It can run at synchronous and sub synchronous speed
  2. It can run at sub synchronous speed only
  3. It can run at synchronous and super synchronous speed
  4. It can run at synchronous speed only
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Option 4 : It can run at synchronous speed only

The starting behavior of a hysteresis motor is like a single-phase induction motor and running behavior are the same as a synchronous motor. Hence it can run at the synchronous speed only.

  • A hysteresis motor is a synchronous motor with a uniform air gap and without DC excitation
  • The torque in a hysteresis motor is produced due to hysteresis and eddy current induced in the rotor by the action of the rotating flux of the stator windings
  • It has high starting torque as it has high rotor hysteresis loss
  • It accelerates from rest to full-speed almost instantaneously
  • It is not sensitive to fluctuations in supply voltage
  • The noise level of the hysteresis motor is very low as compared to the induction motor because it operates at a constant speed and its rotor is smooth
  • This type of motor is the smoothest running, quietest single-phase motor and is used for quality sound reproduction equipment like record players, tape recorders, etc.
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