부산대학교 도서관

Virtual air gaps are created in a transformer core by a change in core permeability in the vicinity of auxiliary windings carrying dc current. A procedure for equivalent air gap length computation is established by performing finite-element analysis to obtain the change in transformer core reluctance. Results obtained from the finite-element analysis are compared with experimental and analytical results available in the literature. Index Terms--Air gap, finite-element methods, magnetic devices, transformers.