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Improved rotor position estimation in extended back-EMF based sensorless PM brushless AC drives with magnetic saliency

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


An improved extended back-EMF based sensorless control method is proposed for a brushless AC motor equipped with an interior permanent magnet rotor. It accounts for dq-axis cross-coupling magnetic saturation by introducing an apparent mutual winding inductance. The error which results in the estimated rotor position when the influence of cross-coupling magnetic saturation is neglected is analyzed analytically, predicted by finite element analysis, and confirmed experimentally, for various d- and q-axis currents. It is shown that a significant improvement in the accuracy of the rotor position estimation can be achieved by the proposed method, as confirmed by measurements

Topics: H600 Electronic and Electrical Engineering
Publisher: Institute of Electronic and Electrical Engineering
Year: 2007
DOI identifier: 10.1109/IEMDC.2007.383579
OAI identifier:

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