Robust State Observer and Variable Sampling Technique for Performance Improvement of a Motor Drive System

A microprocessor-based digital control system of motor speed is discussed with respect to the dynamic response and the accuracy of controlled speed. Two methods for improving both the dynamics and the accuracy are examined in this paper. One is a method of variable gain state observer and the other is a variable sampling technique. Comparing their effects in improving the accuracy of controlled speed, it is shown that the former is preferable to the latter. The validity of the above discussion is confirmed by several simulations.