A fuzzy logic tunable speed controller for a rectifier fed PMDC motor drives

摘要

A novel fuzzy logic (FL) control scheme to regulate the speed of a permanent magnet (PM) DC motor drive via armature voltage control, has been developed. The PMDC motor drive is fed from a 3-phase thyristor controlled rectifier. The proposed FL rule based controller scheme utilizes both motor current and speed errors. The firing delay angle (/spl alpha/) of the 3-phase converter is determined as the output of a modified "weighted centre of area" (WCOA) defuzzifier stage, with an assigned rule base. The controller utilizes novel on-line adjustable defuzzification-weighting criteria to ensure minimum speed overshoot/undershoot as well as reduced motor transient inrush current conditions. The on-line tuning criteria is based on the speed error excursion level.