_ Circuit TheoryFig. 2.1.5 Hard magnetic material magnetized and then demagnetized by the current I.For the more general (and possibly not electrically linear) case for whichflux linkages are expressed by (2.1.17) we can, at least in theory, solve theseN simultaneous equations to obtain the general functional formik = ik(Al, 12,... I AN; X1, X2, ... .M),k = 1, 2, ... , N. (2.1.24)Although we have generalized the concept of inductance to the pointat which we can describe an electrically nonlinear system, the full, nonlinearexpressions are rarely used in the analysis of electromechanical devices.This is so because devices that involve mechanical motion normally have airgaps (where the material is electrically linear) and the fields in the air gapspredominate (see the last two examples). It is worthwhile, however, tounderstand the origins of lumped parameters and how to describe nonlinearsystems because there are some devices in which nonlinearities predominate.
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Magnetic Field, flux density, magnetic material, hard magnetic material