tailieunhanh - Recent Developments of Electrical Drives - Part 16

Recent Developments of Electrical Drives - Part 16. The book stating the recent developments of electrical drives, can be useful for engineers and researchers investigating and designing electrical and electronic devices as well as for students and young researchers dealing with electrical and electronic engineering, computer sciences (advanced computer modelling, sophisticated control systems with artificial intelligence tools applied, optimal design bye use of classical and genetic algorithms employed), applied mathematics and all the topics where electromagnetic, thermal, mechanical phenomena occur | II-1. A GENERAL DESCRIPTION OF HIGH-FREQUENCY POSITION ESTIMATORS FOR INTERIOR PERMANENT-MAGNET SYNCHRONOUS MOTORS Frederik . De Belie Jan . Melkebeek Kristof R. Geldhof Lieven Vandevelde and Rene K. Boel Electrical Energy Laboratory EELAB Department of Electrical Energy Systems and Automation EESA Ghent University UGent Sint-Pietersnieuwstraat 41 B-9000 Gent Belgium Abstract. This paper discusses fundamental equations used in high-frequency signal based interior permanent-magnet synchronous motor IPMSM position estimators. For this purpose an IPMSM model is presented that takes into account the nonlinear magnetic condition the magnetic interaction between the two orthogonal magnetic axes and the multiple saliencies. Using the novel equations some recently proposed motion-state estimators are described. Simulation results reveal the position estimation error caused by estimators that neglect the presence of multiple saliencies or that consider the magnetizing current in the d-axis only. Introduction Vector control of a high-dynamical high-performance interior permanent-magnet synchronous motor IPMSM requires the stator flux linkage vector. For small stator currents this flux is mainly generated by the high-grade permanent magnets buried within the rotor. In a lot of drives using field-oriented control the rotor flux vector is considered instead of the stator flux linkage vector. Moreover the rotor flux direction can be approximated by the rotor position measured with a mechanical sensor. During the last 15 years motion-state estimation methods have been developed with the intention to remove the expensive mechanical transducer which due to temperature variations and mechanical vibrations produces measurements of low reliability. Modern sensorless drives try to estimate the motion states from measurements of electrical variables. Filtering

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