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Option 3 : Hysteresis motor
The rotor of a hysteresis motor is made of magnetic material that has high hysteresis loss property. Example of this type of materials is chrome, cobalt steel or alnico or alloy. Hysteresis loss becomes high due to a large area of the hysteresis loop.
The rotor does not carry any winding or teeth. The magnetic cylindrical portion of the rotor is assembled over shaft through an arbour of non-magnetic material like brass. The rotor is provided with high resistance to reduce eddy current loss.
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