Computation of losses in nonoriented electrical steels from a classical viewpoint (invited)

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Abstract
Nonoriented electrical steels approximate a classical continuum with respect to magnetic and electrical properties. A calculation based on fields which vary smoothly from point to point should therefore be appropriate. At each point, the paths taken by the magnetic fields in the B–H plane are influenced by eddy currents and the eddy currents in turn depend on the B–H paths. This mutual interaction prevents hysteresis and eddy current losses from being independent. The full electromagnetic problem, including these interactions, can be solved for simple geometries. At present we are restricted to solving unidirectional flux problems where convenient hysteresis models may be applied. These yield a reasonable description of complex hysteresis paths with only a limited amount of experimental input. Using a hysteresis model and numerical techniques, loss calculations for both sinusoidal and distorted flux waveforms in thin laminations were performed and are compared with experimental data.