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Proceedings Paper

A State Observer For The Permanent-Magnet Synchronous Motor
Author(s): Lawrence A. Jones; Jeffrey H. Lang
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Paper Abstract

An identity state observer for the smooth-rotor permanent-magnet synchronous motor is derived which reconstructs the electrical and mechanical states of the motor from current and voltage measurements. The observer operates in the rotor frame and estimates direct and quadrature stator currents, rotor velocity, and rotor position. Since the rotor position is estimated, the rotor reference frame is approximated using the latest rotor position estimate. The motor dynamics and the transformation into the estimated rotor frame are nonlinear and thus the observer and observer error dynamics are nonlinear. Therefore, small signal stability is analyzed from a linearized model. Simulations including realis-tic measurement disturbances are used to investigate the global stability and accuracy of the observer.

Paper Details

Date Published: 19 October 1987
PDF: 8 pages
Proc. SPIE 0854, IECON '87: Motor Control and Power Electronics, (19 October 1987); doi: 10.1117/12.942962
Show Author Affiliations
Lawrence A. Jones, Massachusetts Institute of Technology (United States)
Jeffrey H. Lang, Massachusetts Institute of Technology (United States)


Published in SPIE Proceedings Vol. 0854:
IECON '87: Motor Control and Power Electronics
Martin F. Schlecht, Editor(s)

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