[AMPS] How to slow down blower ?

[Johan Nordin]

----------
> Från: Rich Measures <measures@vc.net>
> Till: amps@contesting.com
> Ämne: Re: [AMPS] How to slow down blower ?
> Datum:  den 24 januari 1999 18:42
> 
> 
> 
> 
> >
> >
> >
> >On Sun, 24 Jan 1999 10:29:53 -0500 Bob Dodson WB5APD EM84ak
> ><wb5apd@stc.net> writes:
> >>
> >>Hi all;
> >>
> >>	What is the best way to slow down a 117vac blower. Have lots of air
> >>could use a little less noise. Lamp dimmer will work but think the 
> >>motor would overheat that way.
> >
> >Dentron, Amp Supply used a series resistor to provide a 2 speed effect
> >with muffin fans. I see no reason why it will not work on a blower. I
> >would start with something around 300-500 Ohm 25-50W adjustable
wirewound
> >and experiment. Just be sure that the final value permits reliable
> >starting.
> >
> €  Shaded pole motors can be slowed with a series resistor, however, 
> capacitor-run motors should not.  

I also would like to slow down a large capacitor-fan
How about putting some C in series with the AC or will there be some
problem with changed phasing between U/I through the blower, any ideas?

SM3UZS


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