Salient-rotor PM synchronous motors for an extended flux-weakening operation range

• Published in: IEEE transactions on industry applications Vol. 36; no. 4; pp. 1118 - 1125
• Main Authors: Bianchi, N., Bolognani, S., Chalmers, B.J.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01-07-2000; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Current control; Inductance; Industry Applications Society; Inverters; Motors; Proposals; Pulse inverters; Pulse width modulation inverters; Ratings; Reluctance motors; Rotors; Saliency ratio; Synchronous machines; Synchronous motors
• ISSN: 0093-9994; 1939-9367
• DOI: 10.1109/28.855968

This paper proposes some novel designs of permanent-magnet synchronous motors for extending their flux-weakening capabilities. According to such a proposal, the motors are characterized by a saliency ratio l/sub d//l/sub q/ greater than one, whereas classical designs exhibit a saliency ratio lower than one. The innovative and classical design solutions are deeply compared in the paper. In order to understand better the basic differences in the motor design, the same base and flux-weakening performance are fixed. The influence of the saliency ratio on inverter voltampere ratings, maximum feasible speed, and current control characteristics is highlighted and discussed.