Your going to reduce the power output of the motor by lowering the voltage(cutting it in half!). By using a gear reduction(or pulley) you will increase torque at a lower RPM. Power (in watts) is ~745.7 watts per HP. Watts = current times voltage. so If you cut the voltage you get half the watts of power. A good electric motor is very efficient giving as much as %98 output! Say you go with a 2:1 gear ratio, you will double the amount of torque at half the RPM. If you cut the voltage you will just lose power. Now It's not a good idea to run most motors at maximum power draw (heat=power loss). Belts really aren't that inefficient ether although their will be some friction loss, this will depend on the setup, a good bearing etc will limit this loss. --- On Sun, 4/10/11, Jak Mang <jak.mang@gmail.com> wrote:
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