Quote:
Originally posted by nuclear
Well i think you have part of the equation right big ben. The fan will suck the most current when it is starting or when the motor is near it's limit of power. So when you underpower them, you are actually using more current. I think you should read the article of brian256 link for the article
The part that you will want to read if the last paragraph of the voltage regulator section
Oh and by the way, if the motor doesn't turn, more current pass trought it.
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That's partly right, indeed!
The resistance of a motor is not continuous: it switches on and off all the time. For most purposes, averaging the resistance works. It's not like the pot is going to get real hot, then cool back down to ambient, 10'000 times per minute, now is it? (5 coils, 2'000 rpm)
In Brian's case, he's using a PWM, and there can be an issue there.