Calculation of current distribution and optimum dimensions of foil-wound air-cored reactors

An accurate and straightforward method is given for calculating the current distribution and impedance of foil-wound air-cored reactors. It is applicable to coils of all sizes, including thin flat coils and long solenoids. Measurements of impedance show good correlation with calculated results. The effect of coil dimensions on the nonuniformity of current distribution is summarised in a set of curves in dimensionless form. Foil-wound reactors are subjected to an optimisation study based on size, weight and electrical parameters. The new optimised forms which give maximum quality factor, calculated on the basis of nonuniform distribution of current, satisfying various requirements are given, in addition to the results of optimisation for minimum weight.