Experimental investigations and simulation studies on torque control using an advanced proportional-integral based controller

In this paper, a proportional-integral controller named AFO-PI (adaptive fraction order-proportional integral) was designed for torque control of induction motor. The dynamics of the induction motor are identified using a linear parameter transfer function (LPTF).The parameters considered for designing the AFO-PI controllerwere designed using gain cross over frequency (ω
gc
), phase margin (φ
m
), and velocity error constant (K
v
). A refinement to the designed AFO-PI controller is carried out using a mathematical approach. To realize the (K
v
) specification, an approximation method, namely, Oustaloup recursive, is implemented. From the study, it was observed that AFO-PI outperforms PI.