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how the speed of an ac table fan being controlled?

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FrozenTear

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how to control the speed of an ac table fan?

hello! can anyone explain to me how a 3 speeds table fan
work? what are the factors that are controlling the speed of
a normal table fan? Is it by varying the voltage or changing
the magnetic field? (maybe can explain in the way that how a table fan being controlled at off mode,1st speed, 2nd speed, and 3rd speed?) would appreciate your reply :) thx in advance.
 
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Normally small 1-phase motors use voltage control.
In this case part of the motor winding act as transformer.

See the picture................

View attachment !phase mot control.pdf

Regards KAK
 

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The table fan is a single phase motor and it's coil consist three stage of winding, they are;Helping,Mains and the Regulators winding. the regulator winding is used to regulate the speed of the motor.
 
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