HYBRID PI-FUZZY LOGIC BASED SPEED CONTROL OF AN IPMSM DRIVE

In this paper, Vector control is one of the basic techniques used for the control of a permanent magnet synchronous motor (PMSM). The outer speed loop in vector controlled PMSM drive greatly affects the drive performance during transient and steady state at no-load/variable load conditions. The combined merits of proportional plus integral (PI) and fuzzy controllers were selected and a Hybrid PI-Fuzzy controllers are designed in which the output can either be the outputs of the two, i.e. the PI or fuzzy units being switched during a particular period as per the predetermined speed errors. Hybrid PI-fuzzy logic controller has a quick dynamic response, and eliminated basic steady-state error, which has good robust dynamic characteristics and stability. The design, analysis and simulation of the proposed system is done using MATLAB/Simulink version 8.