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4. When magnetized along the rolling direction the domain walls are expected to move ideally in a linear fashion at the same frequency as the applied magnetic field. However, each wall, which in the demagnetized state is assumed to be planar and normal to the sheet, moves faster on the steel surface than in the interior and consequently moves further on the surface. This causes an eddy current shielding action and the volume of each wall also increases. The net effect of this domain wall bowing phenomenon is to increase the eddy current loss by making a large contribution to Pa .

These partly conflicting needs lead to a general reduction in losses as thickness decreases to a point where hysteresis loss tends to increase so an optimum thickness does occur with most alloys. The optimum thickness is generally lower than practical commercial thicknesses and for any particular composition it depends on operating flux density and frequency level. It should be noted that in many applications it is desirable to optimize the permeability of the steel and minimize the loss at the same time.

16. J. J. Dalton J. Liu A. J. Moses D. H. Horrocks A. Basak A virtual instrumentation based magnetic test system. Studies in Applied Electromagnetics and Mechanics, 10: 792–795, 1996. 17. A. J. Moses Classical and practical approaches to electromagnetic field solutions in magnetic devices, Int. J. Appl. Electromagn. , 6: 1–8, 1995. 18. A. J. Moses Factors affecting localised flux and iron loss distribution in laminated cores, J. Magn. Mag. , 41: 409–414, 1984. 19. A. J. Moses B. Thomas The spatial variation of localised power loss in two practical transformer T-joints, IEEE Trans.

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33.Magnetics by John G. Webster (Editor)


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