Closed-Loop Adaptive High-Starting Torque Scalar Control Scheme for Induction Motor Variable Speed Drives

This article proposes a closed-loop (CL) high-starting torque (HST) scalar control scheme (SCS) for induction motors (IM). It endows the recently proposed HST-SCS with high-output capability beyond starting after using an outer speed loop feeding inner current adaptive controllers. Presenting cascade normalized passivity-based controller (N-APBC) nonlinear systems encompassing IM allows obtaining this result. extends case. As result, it keeps simple without needing variable observers or parameter estimators and employing tuning information only from motor nameplate datasheet. Test bench experiments 10 HP validate proposal’s effectiveness. Comparative experimental results show that CL has required stator phase voltage lower than HST-SCS. The applies curve more extended time HST-SCS, start to 1.9s versus 1.2s, respectively. Hence, assures HST not but almost up 600 rpm, resulting in smoother transient behavior under speed.