Numerical and Experimental Characterization of Thread-Type Magnetic Core With Low Eddy Current Loss

This paper proposes a thread-type magnetic core as a new structured magnetic core made of iron threads and a surrounding insulator. The thread-type core has the advantages of lower eddy current loss, simple production, and low cost. The eddy current loss of the thread-type core is compared with that of bulk- and lamination-type cores. The losses are numerically analyzed using the finite-element method and are measured with an experimental test. The effect of eddy current on copper loss is also addressed. The numerical and experimental results show the usefulness of the thread-type core. Further numerical results show the size effect of the thread core, whereby the smaller size thread results in less eddy current loss.