Single Phase Motors
When a universal motor is operated on no load, its speed is limited by

Armature reaction
Supply voltage frequency
Windage and friction
Weight of the armature

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

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

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