Implementation of digital controller for a 6/4 pole switched reluctance motor drive

In this paper, a advanced digital speed control scheme is presented, that is developed to overcome the drawbacks existing in the previous speed control schemes, which were proposed for switched reluctance motor (SRM) drives. It is based on discrete P, PI and PID control algorithm, and does not require complex mathematical models or large look up tables. The scheme is implemented by using a TMS320F2812 digital signal processor. The real-time experimental results given in this paper show that the speed control method proposed could provide accurate speed control and over a wide range of speeds, and can also perform accurately at different operating conditions (steady state/transient operation under soft chopping mode). The closed-loop SRM speed control system is seen to achieve ±0.01 speed accuracy, depending on the needed operating speed range, with a step response settling time of 0.25 to 1.05 seconds. Complete descriptions of the experimental system, along with software operating instructions, are presented.