There is more than that  . :edit:
I found them oo well it's a bit disjointed. Im quoting it.
Quote:
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It turns electrical current into mechanical torque at the output shaft. Torque = current times Kt, the torque constant. You can also model a motor as a resistor, plus a generator. The generator voltage, or 'back emf' is related to the speed - the maximum or no load speed occurs when the back emf is equal to the applied voltage (minus a little for friction). So this can be described as Back emf = rpm x Kv, the speed constant - or, max speed = Voltage x Kv. If Kt is in units of in-oz/amp, and Kv is rpm/v, then Kt x Kv = 1352
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Of course if you really want to be confused read my topic about the fisher price motors. Someone posted so many equations about motors it will make your head spin.
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Last edited by Adam Y. : 17-11-2002 at 18:40.
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Look for metal shavings in a pwm port; that's caused us to crash plenty of times. - Gary Dillard [more] 
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