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T. Wolbank, R. Wöhrnschimmel, H. Hauser:
"Transient Simulation of Lamination Material Properties in Electrical Machines";
IEEE Transactions on Industrial Electronics, 49 (2002), 3; S. 607 - 612.

All zero speed sensorless control schemes of electrical drives use a high frequency excitation of the machine to determine local differences of the leakage inductances and to estimate the flux or the rotor position.
One of these methods [1] detects the local differences by evaluating the change of the stator current space phasor due to stator voltage test phasors. To get a deeper insight into the transient electric behaviour of the machine it is necessary to take into account also dynamic processes in the lamination material. To achieve this, a model has been developed to simulate the magnetisation process in an induction motor fed by a voltage source inverter.
The proposed model calculates the current change due to voltage pulses taking into account the hysteresis as well as eddy currents. In order to limit the computation time the model has to be kept simple.
Measurements on an inverter fed induction machine as well as on a stator lamination are presented to verify the applicability of the model.