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'[EE]: What about 115 AC fan control? Was: Thanks'
2002\03\11@080420 by Dmitriy A. Kiryashov

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Hi Thomas.

Any other ways to control AC motor ?

I guess there should be more simple tecnique to control AC fan.
Original manufacturers they using resistor in series I think
(what else they can switch inside of cheap Holmes fan ? )
Actually I didn't open a unit yet to prove that.

Also I'm not afraid of non trivial challenges I like them ;)


WBR Dmitry.



"Thomas C. Sefranek" wrote:
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2002\03\11@085332 by Roman Black

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Cheap fans with "speed" switches normally
have split windings in the motor, and the
speed switch selects a combination of the
AC windings.
-Roman

Dmitriy A. Kiryashov wrote:
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2002\03\11@105605 by Dwayne Reid

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At 12:45 AM 3/12/02 +1100, Roman Black wrote:
>Cheap fans with "speed" switches normally
>have split windings in the motor, and the
>speed switch selects a combination of the
>AC windings.

Even cheaper fans (ceiling fans, for example) have a SINGLE winding motor
and just use capacitors in series with the motor to select
speed.  Sometimes those capacitors are a single large blob with several
leads coming out - multiple caps in a single case.

dwayne


Dwayne Reid   <.....dwaynerKILLspamspam.....planet.eon.net>
Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
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2002\03\11@120442 by Bob Ammerman

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Multiple windings on the motor I think. Various combinations are used for
separate speeds. That is why cheap fans never have continuous speed control.

Bob Ammerman
RAm Systems

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