Title :
Sensorless evaluation of asymmetric hysteresis loops of ferromagnetic materials
Author :
Cristaldi, Loredana ; Ferrero, Alessandro ; Lazzaroni, Massimo ; Morando, Adriano P.
Author_Institution :
Dipt. di Elettrotecnica, Politecnico di Milano, Italy
fDate :
6/1/2003 12:00:00 AM
Abstract :
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.
Keywords :
digital instrumentation; ferromagnetic materials; magnetic circuits; magnetic hysteresis; magnetic variables measurement; virtual instrumentation; asymmetric hysteresis loop; digital instrument; dynamic hysteresis loop; ferromagnetic material; linear model; magnetic circuit; magnetic plate; sensorless measurement system; virtual instrumentation; Employee welfare; Instruments; Magnetic cores; Magnetic flux; Magnetic hysteresis; Magnetic materials; Magnetic sensors; Materials testing; Polarization; Saturation magnetization;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
DOI :
10.1109/TIM.2003.814684