Simple robust position control of BLDD motors using integral-proportional plus fuzzy logic controller

Abstract

A new simple control for the robust position control of a brushless direct drive (BLDD) motor using fuzzy logic controller (FLC) is presented. The integral-proportional (IP) position controller plus fuzzy logic speed controller is employed to obtain the robust BLDD motor system, which is approximately linearized using the field-orientation method for an AC servo. The speed FLC for a BLDD motor has the two rule tables. One is the coarse control rule table for the transient state and another is the fine control rule table for the steady state. The possibility of applying the FLC with simple structure to the AC servo system is investigated in detail. The overall system is controlled by using the microprocessor and the robustness is also obtained without affecting the overall system response. The experimental results show the performance of each control algorithm for the BLDD machine. (C) 1998 Elsevier Science Ltd.