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Improved Rotor Position Estimation in Extended Back-EMF Based Sensorless PM Brushless AC Drives with Magnetic Saliency

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4 Author(s)
Li, Y. ; Univ. of Sheffield, Sheffield ; Zhu, Z.Q. ; Howe, D. ; Bingham, C.M.

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.

Published in:

Electric Machines & Drives Conference, 2007. IEMDC '07. IEEE International  (Volume:1 )

Date of Conference:

3-5 May 2007