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:
>
> Dmitriy A. Kiryashov wrote:
>
> >Hi Dale.
> >
> >Can that circuit be used for 115 AC fan control? ;)
> >Sometimes I feel like my brain and body are overheated
> >(no kidding ;) Fan is helping alot but it only has two position:
> >very fast blow and medium blow. I can't stay under it for long
> >unless I want to catch a flue. So I'm thinking to put some
> >controller in series to it. Implemeting PWM code would be easy,
> >probably some indication (like one digit 0..9 is enough)
> >couple buttons (increase and decrease) what else I'm missing?
> >
> Most AC motor's speed are more dependent on the frequency of the AC than
> the voltage.
> Now, you CAN build a sine wave of variable frequency with PWM in a class
> D amplifier fashion,
> but it is non - trivial.

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