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What's the best way to adjust fan speed for a 12V electric car cooling fan?
I'm using an old 16" electric fan off my 89 Camaro as a vent fan for a 7'x3'x3' media blasting booth I've built. I've got it wired to 12v with a switch and relay just like it would be in the car. But I want to be able to control the fan speed based on the type of media I am using. I have no idea about the specs on the motor except that it's 12V, and it won't work on 6V (tried it on the battery charger, didn't spin). I thought maybe a potentiometer, but I'm not sure if I need to adjust the ohms or the watts. Any ideas? Someone has said to use a solid state controller, but I have no idea what it is. I'm looking for the cheapest way.
The switch I'm using right now is actually a 115V $.99 from Home Depot. you think I could try using one of those fan dimmer switches? I know they make them for lights, but dont they make them for fans as well?
1 Answer
- 1 decade agoFavorite Answer
The way it is done on a car is that each switch position adds a different size resistor to the circuit. Dc motors can be controlled by changing the voltage. If you look in an old junk car you can usually find the resistors on the passenger side on somewhere on the duct work. It is put in the duct to cool the resistors as they heat up. You could also use a rehostat but it would have to be a pretty high wattage.