RPM-controller using PID mechanism

Introduction:

“  A proportional–integral–derivative controller (PID controller) is a generic control loop feedback mechanism (controller) widely used in industrial control systems – a PID is the most commonly used feedback controller. A PID controller calculates an “error” value as the difference between a measured process variable and a desired -. The controller attempts to minimize the error by adjusting the process control inputs.  “

How To Control RPM?:

• Motor’s RPM (revolution per minute) depends upon the voltage at the Motor’s terminal. Decreasing the voltage decreases the RPM. However, this method is not conventional and would make the motor a static device.

• PWM (pulse width modulation) is a method which may be used to Control the RPM of MOTORS by keeping the terminal voltage constant.

• H-Bridge: A DC motor controlling circuit which controls the operations for ON, OFF and DIRECTION Control.

• By applying PWM pulses at the inputs of the f H-Bridge motor’s  RPM could be controlled. Changing the Logic at the Input we could reverse the direction of the Motor.

H-Bridge Using IR2110

for more info on above circuit, refer here.