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Magnetic energy loss  P  of soft magnetic laminations like SiFe sheets tends to be expressed through an integral over the power product  H  · d B /d t . Already in earlier papers, we stressed that distinctions are needed for the quantities  H  and  B . However, they are not considered in practically consistent ways, in the so far literature. Here, we discuss these distinctions in closer ways, comparing loss determination by calculation and measurement, respectively. A physically consistent procedure is described for the determination of loss and magnetization power functions through measurement of bi-located quantities  H  S  and  B  C  (S surface, C cross section). On the other hand, it is concluded that corresponding quantitative calculations—based on co-located quantities  H  and  B —are impeded by the high amount of technological parameters of modern steel products. For example, they result from chemical additions, and—in particular—also from specific technologies of rolling, annealing, coating or scribing.

Calculated versus measured iron losses and instantaneous magnetization power functions of electrical steel