Single Phase Motors
Hysteresis motor is particularly useful for high-quality record players and tape-recorders because

it is not subject to any magnetic or mechanical vibrations
it can be easily manufactured in extremely small sizes of up to 1 W output
it revolves synchronously
it develops hysteresis torque which is extremely steady both in amplitude and phase

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Single Phase Motors
The rotor slots, in an induction motor, are usually not quite parallel to the shaft because it

helps in reducing the tendency of the rotor teeth to remain under the stator teeth
improves the efficiency
improves the power factor
helps the rotor teeth to remain under the stator teeth

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