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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 Stone


The 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. A method is also 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 accuracy 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: Institute of Electronic and Electrical Engineering
Year: 2007
DOI identifier: 10.1109/07IAS.2007.356
OAI identifier: oai:eprints.lincoln.ac.uk:2461

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