Current-regulated brushless DC machines are used in a wide variety of applications including robotics, actuators, electric vehicles, and 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 DC drive is set forth. 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 forth. 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


Electrical and Computer Engineering

Keywords and Phrases

DC Motor Drives; Actuators; Average-Value Reduced-Order Models; Brushless DC Motors; Computer Simulation; Control System Synthesis; Current-Regulated Brushless DC Drive; Digital Simulation; Electric Current Control; Electric Machine Analysis Computing; Electric Vehicles; Electromechanical Dynamics Prediction; Electromechanical Transients; Hysteresis Current-Regulation; Machine Control; Machine Theory; Mathematical Model; Operating Modes; Reduced Order Systems; Robotics; Ship Propulsion; Simulation; Transient Analysis

International Standard Serial Number (ISSN)


Document Type

Article - Journal

Document Version

Final Version

File Type





© 1995 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

01 Jan 1995