[AMPS] How to slow down blower ?

[Rich Measures]

>
>
>
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>> 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?
>
€  Johan -  - When I tried it there were heating problems.  My guess is 
that the correct way to slow down a capacitor-run motor is to decrease  
the frequency and voltage of the supply.     As I understand it,  such 
supplies are currently available.  
-  later.  


Rich...

R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures  


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