Robust Stability and Performance Evaluation of an ILQ Optimal Current-Control System for Permanent Magnet Synchronous Motors via μ-Analysis

摘要

This paper presents a quantitative evaluation for robust stability and robust performance of an ILQ optimal current-control system for permanent magnet synchronous motors via μ-analysis method. The μ-analysis is carried out by introducing a unique cost-function for robust performance and formulating a general servo-system which enables us to treat both ILQ and PI servo-systems evenly. By comparing with conventional PI control, it is quantitatively confirmed that the ILQ control is excellent in both robust stability and robust performance for variations of the motor's parameters. The results obtained give analytical verifications for simulation results which we had already reported.