Calculation of the Effective Parameters of Magnetic Piece Parts with Asymmetrical Parallel Magnetic Circuits

The International Electrotechnical Commission (IEC) has provided a set of formulae in the standard IEC 60205 Ed.3:Calculation of the Effective Parameters of Magnetic Piece Parts (2006-01),for calculating the effective parameters of pair of magnetic cores with symmetrical shapes and sizes,e.g.EI and EE cores.However,the effective parameters of some special cores can't be figured out by the IEC 60205 formulae in the case that the center limb of asymmetrical core deviates from its central location or its magnetic circuit is composed of two or more different branches of parallel magnetic circuit.In this article,another set of formulae are recommended,for calculating the effective parameters of cores with asymmetrical parallel magnetic circuits.The effective parameters of symmetrical cores were figured out by both the IEC 60205 formulae and the new formulae we recommended,and basically the same results were obtained.In other words,as general expressions,the new formulae can apply to such symmetrical cores,a special case of the asymmetrical one,but it easily solved the difficult problem in calculating the parameters of cores with asymmetrical or multi-loop parallel magnetic circuits.