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Sensorless evaluation of asymmetric hysteresis loops of ferromagnetic materials

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4 Author(s)
L. Cristaldi ; Dipt. di Elettrotecnica, Politecnico di Milano, Italy ; A. Ferrero ; M. Lazzaroni ; A. P. Morando

The sensorless determination of the dynamic hysteresis loop of magnetic materials, and in particular those of magnetic plates, can be obtained under ac symmetric conditions in a relatively simple way. This paper proposes a new digital method and instrument for the sensorless evaluation of the dynamic hysteresis loop under ac asymmetric conditions, in the presence of a dc polarization of the magnetic flux. The method is based on the determination of the parameters of a simplified linear model of the magnetic circuit, which preserve the energy equivalence. The results of some experimental work are given in order to validate the proposed method.

Published in:

IEEE Transactions on Instrumentation and Measurement  (Volume:52 ,  Issue: 3 )