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High-frequency applications

High-frequency applications

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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.

Inspec keywords: protective coatings; power electronics; metallurgy; optimisation; Green's function methods; insulation; power transformers

Other keywords: Green demands; high-frequency applications; surface insulation; interlaminar voltages; space factor; metallurgical challenge; transformer designers; steel makers; permeability; grain size; power electronics experts; harmonic contents; polished surfaces; motor designers; optimisation; solid steels

Subjects: Power convertors and power supplies to apparatus

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