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Improved rotor-position estimation by signal injection in brushless AC motors, accounting for cross-coupling magnetic saturation

By Y. Li, Z. Q. Zhu, D. Howe, Chris Bingham and D. A. Stone

Abstract

This paper presents an improved signal-injection- based sensorless-control method for permanent-magnet brushless ac (BLAC) motors, accounting for the influence of cross-coupling magnetic saturation between the d- and q-axes. The d- and q-axis incremental self-inductances, the incremental mutual inductance between the d-axis and q-axis, and the cross-coupling factor are determined by finite-element analysis. An experimental method is proposed for measuring the cross-coupling factor which can be used directly in the sensorless-control scheme. Both measurements and predictions show that a significant improvement in the accu- racy of the rotor-position estimation can be achieved under both dynamic and steady-state operation compared with that which is obtained with the conventional signal-injection method

Topics: H600 Electronic and Electrical Engineering
Publisher: IEEE
Year: 2009
DOI identifier: 10.1109/TIA.2009.2027518
OAI identifier: oai:eprints.lincoln.ac.uk:2900

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