Quote:
Originally Posted by BrianG
I think you have that a little incorrect. A motor will draw more current with more voltage. This assumes that the motor wind, gearing, etc is unchanged.
If you increase the voltage, you have to increase the number of motor turns to reduce current.
However, if you want to run higher voltage on the same motor, you could gear down a little. That will reduce the mechanical load on the motor, which reduces the current. So, the higher current generated by the higher voltage is somewhat offset by the reduced mechanical load.
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Yes, I neglected to mention gearing both setups for the same speed. Also, if you consider the motor output(watts) constant, the the amp draw goes down with increased voltage. Now I am sure in the real world the more voltage you put on a motor the more power it can output, but there must be a limit to the power output though, mechanical or otherwise. So if you could push 10 volts into a motor with enough current draw to approach the max output of the motor and campare it to 20 volt,s the current draw would be roughly half. I do not have the pratical background, just theroretical knowlege from readin' an stuff, so I may be wrong!