Permanent-magnet synchronous machines fed from current-regulated converters feature nearly ideal performance at low-to-moderate speeds. However, as rotor speed increases the back emf rises which results in loss of current regulation and decreased torque. In buried-magnet machine drives, flux weakening is often used to extend the speed range. This paper sets forth a flux-weakening control specifically designed for surface-mounted permanent-magnet machines which is simple and does not require knowledge of the machine or system parameters. The proposed method is demonstrated both experimentally and through the use of computer simulation


Electrical and Computer Engineering

Keywords and Phrases

PWM Power Convertors; Back Emf; Computer Simulation; Current-Regulated Converters; Current-Regulation; D-Axis Control; Digital Simulation; Electric Current Control; Electric Machine Analysis Computing; Flux-Weakening Strategy; Machine Control; Magnetic Flux; Magnetic Variables Control; Permanent Magnet Motors; Q-Axis Control; Rotor Speed; Simulation; Surface-Mounted Permanent-Magnet Machine Drives; Synchronous Current Regulator; Synchronous Motor Drives

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