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T. Wolbank, R. Wöhrnschimmel:
"A Magnetic Equivalent Circuit Model of the Induction Machine for the Simulation of Magnetic Transients";
Poster: International Conference on Power Electronics and Motion Control, EPE-PEMC, Kosice, Slovak Republic; 05.09.2000 - 07.09.2000; in: "Proceedings of Electrical Machines and Actuators", Vol. 5 of 7 (2000), ISBN: 80-88922-22-4; S. 119 - 124.

The simulation of transients in saturated electrical machines by means of an equivalent circuit model is already known and was published, for example, in [1]. Suggested methods to imply non-linear magnetic behaviour are usually an analytical approximation of the magnetisation curve or, as in most cases, sampled data of the B-H characteristic and an interpolation between those data-points. Both methods neglect the hysteresis effects of the material, what is admissible as long as magnetic transients are not of major interest. But they are essential for sensorless control schemes of electrical ac drives, which are based on spatial differences of the magnetic saturation level. One of these sensorless control methods is the so-called INFORM method ("Indirect Flux detection by On-line Reactance Measurement") [2]. For this method the local differences of the leakage inductance along the circumference of the machine are used to estimate the flux position without mechanical sensor. Therefore, the change of the stator current space phasor due to stator voltage test phasors is evaluated. The paper gives an overview of an energetic model of the material, which is described in detail in the references [4], [5], and presents it's application to the machine model. Simulation as well as measurement results of the sensorless control signals are also given.