What kind of speed control mechanism is used ?
• The twist grip control changes some electrical parameters in a circuit. To control the speed of a D C motor we need a variable voltage D C power source. However if you take a 12V motor and switch on the power, the motor will start to speed up: but not immediately so it will take a small time to reach full speed. If we switch the power off sometime before the motor reaches full speed, then the motor will start to slow down. If we switch the power on and off quickly enough, the motor will run at some speed part way between zero and full speed. This is exactly what our controller does: it switches the motor on in a series of pulses hundreds of times per second. To control the motor speed it varies the width of the pulses – hence known as Pulse Width Modulation.
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