Power Tools

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What type of potentiometer to install for a box fan?

I’m building a powder coat booth, and I need a fan to pull out the dust and powder left behind as I am shooting. I’ve got a cheap Wal Mart box fan that I want to install a potentiometer on so I can fine tune the air speed. I’ve found out that the rotary switch with the “1-2-3-Off” is just that; a switch. The resistance is actually in the motor. On the “3″ wire going to the motor (the “high” setting), there is appx. 37 ohms. I was thinking of getting a potentiometer that goes from 0-100 ohms and installing it on the “3″ wire. That way I can still go lower than the fan could before if need be, or go wide open like it was originally designed to, all the while having total control over air speed. Are there any specific potentiometers I should look for? Voltage ratings, wattages, anything specific?

I don’t think that using a potentiometer directly to an AC motor is going to work very well. It would have to dissipate a lot of heat. (would need to have a large watt rating). You might try an autotransformer that would work for the voltage and current your fan needs. Even then, it may not be good for an AC motor to run at a reduced voltage, it might get hot. It might be simpler to just run at the 3 setting and use a gate to divert some of the air output away to reduce the amout of airflow going into your booth.

BASF and Rotary helping in Nigeria

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GF-RP48 $149.95 There are twenty different panel elements on the GF-RP48 Panel Module all brought together, providing a level of cockpit control never before possible in a 2″ tall panel module. Each of the control knobs on the RP48 can be used to adjust instrument panel settings such as Altimeter, Gyro, OBS1 and OBS2, as well as many others. For day verses night flying, you can use a RP48 knob to set the brightn…