Abstract
A new method has been developed for domain refinement, and hence loss reduction of high-permeability grain-oriented electrical steel, utilising large low-friction ball unit assemblies to create lines of stress across the steel, which simulate the effect of artificial grain boundaries. Application of appropriate loads to ball units of diameter up to 39.7 mm has been shown to reduce the power loss of the steel by up to 9.6%, when using a stress line spacing of 7.5–10 mm. This is achieved without damaging the surface insulation layer. The method is relatively inexpensive to set up on a commercial scale and is amenable to high-speed operation. A patent application is currently being progressed.
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