NDLI: Analysis of Negative-Saliency Permanent-Magnet Machines

Content Provider	IEEE Xplore Digital Library
Author	Moncada, R.H. Tapia, J.A. Jahns, T.M.
Copyright Year	1982
Abstract	In this paper, a negative-saliency permanent-magnet (PM) synchronous machine analysis is presented. This particular saliency feature is achieved by replacing a portion of the magnet material by a soft iron piece over the rotor pole. In this manner, the d-axis inductance is increased, whereas the q-axis inductance is almost not affected, leading to the condition that Ld is higher than Lq (negative saliency) corresponding to the inverse condition of typical PM machines. An expression for the optimum pole configuration is derived. It is shown that, with appropriate control of the stator current based on the machine's saliency, the unfavorable effects of magnet reduction on torque production can be compensated. It is also shown that the machine saliency affects the location of the operating points when it operates under vector control. Finally, the theoretical analysis is validated with experimental results obtained from a prototype axial-flux PM machine that exhibits negative saliency.
Sponsorship	IEEE Industrial Electronics Society
Starting Page	122
Ending Page	127
Page Count	6
File Size	806316
File Format	PDF
ISSN	02780046
Volume Number	57
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic analysis Magnetic materials Inductance Synchronous machines Iron Torque control Stators Production Machine vector control Prototypes vector control Axial-flux machines flux control flux weakening (FW) inverse saliency maximum torque per amp (MTPA) permanent-magnet (PM) machines PM motors
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Electrical and Electronic Engineering Computer Science Applications

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