Time delay compensation by estimating speed error of a PMDC motor using backward arc length approach

In high precision control of DC drives, real-time error calculation is the most vital controlling parameter. Due to the time delay of the control circuit, mostly controlling action has been initiated based on the past error that may hamper the precision of the controller. In this regards, future error has to be estimated to initiate the controlling action based on real-time error. But due to the presence of uncertainty in load and also the presence of mechanical inertia in the system, it is difficult to estimate the future speed error based on the Permanent Magnet Direct Current (PMDC) motor system equation. In this paper, the speed error estimation of PMDC motor has been incorporated based on backward arc length of error graph itself. The proposed error estimation approach applied to PMDC motor speed error tracking will overcome the effect of processing time delay of the controller. This proposed speed error tracking method pointing towards the time delay control of PMDC motor. This technique will help to compensate the effect of processing delay time of used controller.