CONSTANT-SPEED CONTROL OF THE QUICK RETURN MECHANISM DRIVEN BY A DC MOTOR

For the dynamic analysis Hamilton's principle and Lagrange multiplier method are applied to formulate the equations of the motion of a quick return mechanism driven by a DC motor, The coordinate partitioning th eorem is applied here to provide a theoretical reduction of differenti al-algebraic equations to differential equation farm. In this work, we are concerned with the analysis and design a modified proportional-in tegral-derivative (PID) controller which was based on the principles o f conventional PID controller to keep the driving crank with a constan t angular velocity. Results of numerical simulations show that the ang ular velocity fluctuation can be reduced substantially and this modifi ed PID controller also fan give reasonably good results whatever it ha ve or not considered cutting force in the system.