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ABRA Electronics :: Educational Kits :: Motor and Stepper Motor Kits :: DC Motor Speed Control Kit with Case

DC Motor Speed Control Kit with Case

Now here's a simple kit that fills the bill for those sticky motor control problems, whether it be a robot, model train speed control, drill fan or even an electric car. You see, controlling a DC motor's speed is not as easy as varying it's supply voltage. The motor loses torque (power) as the voltage is lowered and finally stops rotating. The MSC-1 uses a technique known as "Pulse Width Modulation - PWM" to control speed. This is the same system as used on electric cranes, buses and subway cars. With PWM, the motor receives full voltage at all times, only the duration of the voltage changes - sort of like flipping an on/off switch very rapidly! The motor rotates smoothly and with full power - no matter what the speed. The MSC-1 will control DC motors from 3 to 50 volts at up to 10 amps! Complete instructions detail how the PWM circuitry operates and some hook-up ideas.