High-frequency applications
The trend towards devices operating at higher frequencies and higher harmonic con tents is providing a challenge for conventional solid steels. The likely reaction is for these to be provided at thinner thicknesses, perhaps with polished surfaces so that the space factor is maximised. Very thin but effective surface insulation is needed since high frequencies imply comparatively high interlaminar voltages. A judicial choice of alloy level can give increased resistivity while high-field permeability is held at a good level. The metallurgical challenge lies with optimisation of grain size and material final texture. Although the competition from alternative materials may increase, the ben efits of solid steel have good prospects of keeping this core metal in the forefront of markets. It is now a good time for cooperation between power electronics experts, steel makers, motor designers and transformer designers to be developed so that the ever rising tide of Green demands can be appropriately met.
High-frequency applications, Page 1 of 2
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