Current Ripples in Classical Predictive and Modified Dead-Beat Controller for PM Synchronous Motors-Analysis and Experimetal Results

A rapid change of applied voltage caused by high-nonlinear behavior of a voltage inverter results in motor phase current ripples. Classical Dead-Beat current controller for Permanent Magnet Synchronous Motor performs excellent for a wide range of speeds and torques but for some applications, if the current loading is extremely high, there is a need to modify main motor parameters used in Dead-Beat current controller model to avoid extreme current ripples. Paper tries to describe the phenomena in a more quantitative way. Levels of current ripples were systematically simulated for nominal motor parameters and set of distorted parameters. Experimental results verified obtained results and proved high performance of the proposed modified control algorithm.