ANALYSIS OF A CURRENT-REGULATED BRUSHLESS DC DRIVE

Current-regulated brushless de machines are used in a wide variety of applications including robotics, actuators, electric vehicles, and recently, ship propulsion systems. When conducting system analysis of this or any other type of drive, average-value reduced-order models are invaluable since they provide a means of rapidly predicting the electromechanical dynamics and are readily linearized for control system synthesis. In this paper, a highly accurate average-value reduced-order model of a hysteresis current-regulated;brushless de drive is set fourth. In so doing, it is demonstrated that the drive exhibits five distinct operating modes. The physical cause of each of these modes is explained and a mathematical model for each mode is set fourth. The mathematical models are verified both experimentally and through the use of computer simulation. It has been found that the model set fourth herein is on the order of 300 times faster than a detailed computer simulation in calculating electromechanical transients.