Novel Adaptive Controller for Effective Magnetic Measurement Under Arbitrary Magnetization
Résumé
Abstract—In the context of the ever-expanding application
of soft magnetic materials, the fully controlled magnetic
measurement has, therefore, become essential. It
ensures not only the accurate modeling of materials but
also the rigorous quality control throughout the manufacturing
process, as well as the explicit communication of
magnetic data in academic studies or between suppliers
and customers. Due to the non-linearity and hysteresis
nature of electrical steels, automatic flux density controller
is required for high standard measurements. We propose
in this paper a novel steady-state digital control algorithm
with two loops, one to regulate amplitude and the other to
correct waveform of the flux density. Measurement results
for various samples tested by Epstein frame and ring specimens
under different waveforms, a wide range of frequency
and high amplitudes of the flux density have proven the
high adaptability, accuracy and convergence speed of this
controller. Its principle is discussed in details, together with
the employed measurement bench.
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