A hysteresis motor works on the principle of:
- Hysteresis loss
- Eddy current loss
- Both of these
- None of these
Correct answer: 1. Hysteresis loss
A hysteresis motor works on the principle of hysteresis loss.
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If the low hysteresis Si-steel laminated rotor of an induction motor is replaced by a slotless winding less cylinder of hardened magnet steel, hysteresis, or lagging behind of rotor magnetization, is greatly accentuated. The resulting low torque synchronous motor develops constant torque from stall to synchronous speed. Because of the low torque, the hysteresis motor is only available in very small sizes and is only used for constant speed applications like clock drives, and formerly, phonograph turntables.
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