Single Phase Motors
If a single phase induction motor runs slower than normal, the most likely defect is

short-circuit in the winding
open-circuit in the winding
worn bearings
None of these

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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 revolves synchronously
it is not subject to any magnetic or mechanical vibrations

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