DC Motor Speed Control, 30A
The Global Specialties GSK-805 DC Motor Control Kit comes pre-assembled and utilizes pulse width modulation (PWM) to vary the speed of a DC motor from stop to maximum revolutions per motor specifications. PWM eliminates the need for gearboxes and can drive motors at low speeds with minimal torque loss. The kit outputs at 12 V or 24 V with a 30 A max load and runs at a fixed 100 Hz. The output voltage will always match the input voltage. The large heatsinks and heavy-duty MOSFET's ensure reliable performance in continuous use applications. Applications include DC motor speed control, LED and incandescent lamp dimming, and current control in hydroxyl or HHO generators.
Circuit Description
PWM controls the current output by regulating the duty cycle between 0 and 100%. As the variable resistor is adjusted and the positive portion of the duty is greater the motor will slow down. Placing or removing the jumper at Point J (see Figure 1) will select the input operating voltage at 12 V or 24 V.