Fractional order speed controller for buck-converter fed DC motor

The speed control of the DC motor fed through buck-converter is generally employed with conventional integer order PID. The closed loop speed control of these drives are prone to deteriorate in their performance over a period of time. This paper proposes the fractional order (FO) PID speed controller with DC motor. The feasibility of more tuning parameters enhances the performance. Oustaloup's approximation method is used to approximate the fractional order differentiator and integrator. This controller performances are tested in the simulation mode.