Design and Implementation of Digital Controller for the Speed Control of DC Servomotor

Abstruct This project deals with the speed control of a DC servo motor. The speed is controlled by a digital PI controller. The difference equation of the PI controller is obtained from the transfer function and the digital controller is implemented by the graphical Programming method. In speed control application of servomotor proportional controller can reduce the steady state error if the load is not applied. In the loaded condition, the steady state error increases which is eliminated by the use of the integral controller. So by using the PI controller we can attain the actual speed equal to the desired speed in spite of the load variations. During the development of the graphical control software, the PCI-1200 DAQ card is used for the real time control. Square and triangular reference wave signals are produced by the proposed software, which greatly simplified the hardware configuration.