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Originally Posted by Matt Leese
To control the speed of a DC motor, you vary the voltage applied to it. PWM is used solely as a communication mechanism between the RC and the speed controller. It's not used for controlling the actual motor (you'd probably break the motor if you tried). The actual inside of the speed controller consists of an H-Bridge which allows for variable voltage control.
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The Victor speed controllers
do use pulse width modulation of the power to the motor. The H-switch inside them is a digital device, either completely off or completely on in one direction or the other. The
average voltage to the motors is controlled in approximately 1% steps, but the peak is always full battery voltage.