Abstract
In this paper we demonstrate, that shearing is changing only one parameter of the static loop. By using the shearing factor Ns, linked to the widely used, demagnetization coefficient ND, we show the one parameter link between the static unsheared and that of the sheared saturation loop, obtained by a non-toroidal, open circuit hysteresis measurement. The paper illustrates the simple relation between open circuit loop data and measured real static saturation data. The proposed theory is illustrated by using the hyperbolic model. For experimental illustration, tests results are used, which were carried out on two closed and open toroidal samples, made of NO Fe-Si electrical steel sheet, mimicking the demagnetization effect of the open circuit VSM measurement. These are both theoretical and experimental demonstrations, that shearing only changes the inclination of the static hysteresis loop. These test results, presented here, agree very well with the calculated results, based on the proposed method.
Highlights
A practical way of characterising a magnetic material is to measure its static hysteresis loop in a closed magnetic circuit
In this paper we demonstrate, that shearing is changing only one parameter of the static loop
By using the shearing factor Ns, linked to the widely used, demagnetization coefficient ND, we show the one parameter link between the static un-sheared and that of the sheared saturation loop, obtained by a non-toroidal, open circuit hysteresis measurement
Summary
A practical way of characterising a magnetic material is to measure its static hysteresis loop in a closed magnetic circuit This usually takes form in a toroid or an Epstein square [1], which minimises most of the stray and side effects of other measuring methods. This is difficult in practice, considering the shapes and sizes of the samples of the magnetic materials in industrial applications. It is possible to work out the un-sheared parameters (equivalent to closed circuit toroidal measurements) from the open circuit results of a VSM results It will be shown, that this procedure requires only change in the effective slope of the loop with no change in the other major parameters of the modelled sample [8]. Work is extended to include the so far neglected effects to improve on the accuracy
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