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R. Wieser, A. Lechner:
"Accurate On-Line Model for a 6-Phase Current Source Inverter Fed Induction Machine without Machine Current Measurement";
Talk: ICEM, Istanbul, Turkey; 1998-09-01; in: "International Conference on Electrical Machines ICEM'98", (1998), 1.

Six-phase induction machines exhibit several advantages for high power drive applications. In particular shaft drive power can be increased beyond the limits of the actual power device technology. In case of a current source inverter both line side power quality and machine torque characteristics can be improved due to 12-pulse operation mode. Double star inverter drives also exhibit emergency operation capability with one system operating only. This paper presents an on-line space phasor model for a 6-phase induction machine that takes the mutual coupling between the two stator winding systems into account. The model approach emphasizes a minimum parameter count without affecting model accuracy. The analog to digital conversion technique is included in the model implementation approach, which leads to high accuracy and superior noise immunity. The model is generally applicable although the presentation is focused on current source inverter supply. The presented technique has been successfully implemented and tested in a 1.5 MW coal mill drive.