OT ALERT!!! How does an AC fan switch work?
#16
#18
A standard, simple, "box fan" varies speed, while still consuming full voltage, by varying the number of "poles" (windings) used.
Since there is a physical resistance by the air being pushed, and it takes magnetic energy to rotate that motor, less magnetism will turn the fan slower against the resistance of the air.
If you lower the voltage, you get less magnetism in those windings.
Those "speed controllers" are triac devices which will effectively lower the average voltage applied, thus magnetism, thus speed.
Did I get that right? Yea, I think I did........
Pop
Since there is a physical resistance by the air being pushed, and it takes magnetic energy to rotate that motor, less magnetism will turn the fan slower against the resistance of the air.
If you lower the voltage, you get less magnetism in those windings.
Those "speed controllers" are triac devices which will effectively lower the average voltage applied, thus magnetism, thus speed.
Did I get that right? Yea, I think I did........
Pop
#19
I must have a freak of a fan because when I looked at the one in my living room and there are only 2 wires going to the motor, the ones that we have in the hose have multiple wires, and you can hear the sound of the motor change when you switch speeds. This fan also has a infinite speed control on it as well......
#21
Just an update to put this topic to bed...Did the fan speed switch as described earlier (got a wall switch from HD for $12 and it works like a charm). I had to play with it a bit to get the correct speed I wanted. During the day it blows heat out so I set the original fan switch to low and the new switch to high...at night I set the original fan switch to high and the new switch to low (absolutely silent) and it blows nice cool high-desert air across our bed. Thanks to all, though I wonder if Jody could burn a chip for it ?
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PaulC
1997-2006 Expedition & Navigator
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08-24-2004 08:39 PM