Use of novel adaptive digital feedback for magnetic measurements under controlled magnetising conditions

Zurek, Stanislas, Marketos, Philip, Meydan, Turgut ORCID: https://orcid.org/0000-0002-4608-0507 and Moses, Anthony John 2005. Use of novel adaptive digital feedback for magnetic measurements under controlled magnetising conditions. IEEE Transactions on Magnetics 41 (11) , pp. 4242-4249. 10.1109/TMAG.2005.854438

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Abstract

There are increasing calls to employ conventional magnetic testers, such as the Epstein frame and single sheet tester, for the accurate measurements of magnetic properties of soft magnetic materials under fully controlled nonsinusoidal flux density waveforms. This paper presents a computerized automated adaptive digital feedback system built for that purpose. We present several examples of the ability of the system to control an arbitrary shape of the flux density waveforms over the frequency range of the data acquisition system (0.5 Hz to 2 kHz) and for peak flux density up to 90% of saturation. The control algorithm is capable of magnetizing magnetic material under controlled sinusoidal, triangular, trapezoidal, and pulsewidth-modulated magnetizing conditions as well as other arbitrary waveforms that do not contain dc components. We provide a full description of the adaptive digital feedback technique together with measurements showing the B-H loops for several magnetic materials under various controlled excitation conditions.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Uncontrolled Keywords:	Digital feedback , magnetic measurement , power loss measurement , rotational magnetization , two-dimensional magnetization , waveform control
ISSN:	00189464
Last Modified:	17 Oct 2022 09:03
URI:	https://orca.cardiff.ac.uk/id/eprint/1933

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