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M. Schrödl, E. Robeischl:
"Sensorlose Drehzahl- und Lageregelung von Permanentmagnet-Synchronmaschinen auf Basis des INFORM-Verfahrens";
E&I Elektrotechnik und Informationstechnik, 2 (2000), 2; 101 - 112.

This paper shows the operation of permanent magnet synchronous motors without speed- and position sensors in speed- and position-controlled drive applications. Starting from classical field-oriented control methods, a speed-sensorless drive is presented. The basic idea is to estimate the actual speed and position of the drive by the INFORM method (low speed and standstill) and EMF-based models (high speed). Measurements on a position-controlled industrial system verify the high quality of the sensorless system, which reduces the hardware costs of the drive and increases the reliability by eliminating mechanical components.