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T. Wolbank, R. Wöhrnschimmel, J. Machl:
"Consideration of Rotor Bar Skewing in a transient two-dimensional Equivalent Circuit Model of the induction machine";
Vortrag: 7th International Conference on Modeling and Simulation of Electrical Machines, Converters and Systems (ELECTRIMACS), Montreal, Canada; 18.08.2002 - 21.08.2002; in: "Proceedings on Modeling and Simulation of Electric Machines, Converters and Systems", (2002), ISBN: 2-921145-31-6; S. 1 - 6.

In recent years, a lot of effort has been undertaken to omit the sensor in field oriented AC-Machine drives since this would increase its reliability and decrease the costs. Most promising are methods which evaluate the machines response during a high frequency or transient excitation and make parasitic effects visible. These effects are mainly due to saliencies induced by saturation and rotor slotting, so that it is possible to track the desired flux- or rotor position. Simulation of these parasitic saturation and slotting effects is important in order to investigate the high frequency or transient machine behavior on which the suitability of different machines in a sensorless control scheme depends. For that task, the magnetic equivalent circuit model appears to be a tool requiring only reasonable calculation time. Finite element programs are so far not capable to calculate transients in saturated machines. But since the magnetic equivalent circuit model is a two dimensional model, attention has to be paid to a correct modeling of rotor bar skewing. It will be discussed that mainly the zig-zag permeance determines the transient machine behavior with respect to rotor slotting and that it is highly dependent on rotor bar skewing. How this effect in the third dimension is accounted for in a two dimensional model is presented further on. Simulation and measurement results are then compared and verify the applicability of the suggested simulation method.