Title :
Design issues and estimation errors analysis of back-EMF based position and speed observer for SPM synchronous motors
Author :
Bolognani, Silverio ; Calligaro, Sandro ; Petrella, Roberto
Author_Institution :
Dept. of Electr. Eng. (DIE), Univ. of Padova, Padova, Italy
Abstract :
A back-electromotive force (back-EMF) based sensorless technique for surface-mounted permanent magnet synchronous motor (SPMSM) drive systems is considered in this paper. The model of the observer is developed in the Laplace domain and represents an original approach with respect to state-of-art proposals, normally employing a state-state representation. This allows a more intuitive but equivalent design of the observer´s gains, based on the standard frequency response, as compared to eigenvalues analysis. Moreover steady-state errors are obtained from a theoretical point-of-view, including the effects of the most common non-idealities affecting the drive system (e.g. offsets) and parameters sensitivity. Full simulation and experimental characterization of the sensor-less drive is provided with reference to a general purpose industrial drive, i.e. both in transient and steady-state conditions and in the whole speed/torque operating range.
Keywords :
electric potential; observers; permanent magnet motors; sensorless machine control; synchronous motor drives; velocity control; SPM synchronous motors; SPMSM; back-EMF based position; back-electromotive force; design issues; eigenvalues analysis; estimation errors analysis; sensor-less drive; speed observer; state-state representation; steady-state errors; surface-mounted permanent magnet synchronous motor drive systems; Estimation error; Mathematical model; Observers; Steady-state; Synchronous motors; Voltage measurement; PMSM; back-EMF observer; sensorless;
Conference_Titel :
Sensorless Control for Electrical Drives (SLED), 2011 Symposium on
Conference_Location :
Birmingham
Print_ISBN :
978-1-4577-1855-7
Electronic_ISBN :
978-1-4577-1853-3
DOI :
10.1109/SLED.2011.6051558