PWM ( Pulse Width Modulation ) is the method of pulsing a DC Motor so very rapidly that the mechanical inertia of the motor armature like a spinning top continues to turn when another pulse adds DC rotational energy to the motor.If we vary the width of the pulse ( say Wider ) the average motor energy increases and the motor speeds up ( turns faster )..If we shorten the the pulse width the average motor energy decreases and the motor slows down ( turns slower ).Now you ask, why do all this pulse work when simply changing voltage can change motor speed ? ?Well the motor pulses are full voltage, and the motor may be slow but it will have the torque of a full voltage motor even at low speed :-)A
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Only if full current flows during the on period. And inductance stops that. Steve
Ive wanted to make a pwm generator for my heater blower in my car.Theyre pretty cheap & seem worth buying. I just want to be able & know how...
Err. You connect the motor to the PWM generator, and vary the duty cycle. Simples.Steve