Abstract
Using a circuit model, loss calculations have been carried out for coils and short samples, made of twisted multifilamentary composites or flat braided cables, which undergo any space and time-variations of the magnetic induction, of the transport current and of the temperature. This model has been tested by measuring losses in short samples submitted to a rotating magnetic field and to a longitudinal magnetic field and in solenoids and ‘special coils’ which look like small Tokamaks, where the composite which carries a time dependent current, is submitted to simultaneous transverse and longitudinal magnetic induction changes. Experimental and theoretical values are in good agreement within about 20% for hysteretic losses and for eddy current losses.
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