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raymor · 03-31-2012, 08:33 PM

For those curious about electric motor RPM and why gears are needed, a motor and a generator are basically the same thing. When a motor spins, it generates electricity backwards from the way the electricity from the battery is coming. So in other words, a motor being run at 6V acts as a generator producing -6V. That's why it can't go any faster than that max RPM - the negative voltage it generates depowers itself. So with 6V + -6V = 0 volts, the motor has basically no power at max RPM. On the other hand, a motor at 0 RPM obviously isn't moving the car. So you want to keep the motor RPM right in the middle of those two extremes, at half of max RPM.

03-31-2012, 08:33 PM
raymor Confirmed User Join Date: Oct 2002 Posts: 3,745	For those curious about electric motor RPM and why gears are needed, a motor and a generator are basically the same thing. When a motor spins, it generates electricity backwards from the way the electricity from the battery is coming. So in other words, a motor being run at 6V acts as a generator producing -6V. That's why it can't go any faster than that max RPM - the negative voltage it generates depowers itself. So with 6V + -6V = 0 volts, the motor has basically no power at max RPM. On the other hand, a motor at 0 RPM obviously isn't moving the car. So you want to keep the motor RPM right in the middle of those two extremes, at half of max RPM. Last edited by raymor; 03-31-2012 at 08:34 PM..