Single Phase Motors
A universal motor operates on

Constant speed and varying load
Approximately constant speed and load
Synchronous speed with varying load
Constant load and varying speed

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

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
it can be easily manufactured in extremely small sizes of up to 1 W output

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