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U. Rieder, E. Robeischl, M. Schrödl:
"Examination of the Short Circuit Model for Sensorless PM Synchronous Motors with respect to Torque Ripple, Measurement Period and Model Deviation";
Vortrag: International Conference on Power Electronics and Motion Control, EPE-PEMC, Cavtat, Dubrovnik, Croatia; 09.09.2002 - 11.09.2002; in: "Proceedings of the10th international power electronics & motion control conference", (2002), ISBN 953-184-047-6; S. 1 - 9.

In many applications, especially for low-cost-drives and systems with limited requirements on position accuracy, mathematical models are used for position estimation. Sensorless control of Permanent
Magnet Synchronous Motors (PMSMs) is based on mathematical models. Saliency-based models work well at low speed down to standstill, whereas in the high speed range back-EMF based models can be implemented. This paper presents an extended analysis of the so called "short circuit model" (back-EMF-based). The model deviation caused by the neglected stator resistance at nonzero direct-axis current
component and saliency effects is derived in detail. Furthermore the minimisation of the torque ripple caused by the short circuit state will be analysed and minimised for highest speed range by measurement period adaptation, so that it is limited (and on request constant) by a determined value in whole operation area. An enhanced short circuit model for high speed range (motoring and generating mode) is implemented at which operation in field weakening area is possible. Combination with the INFORM-method (for low speed range including standstill) results in a sensorless variable speed drive supporting the whole speed and load range.