Effect of dimension ratio on the magnetic properties of tape‐wound toroidal core with ac excitation

Abstract

Tape‐wound toroidal cores are used widely as magnetic devices of electronic equipment and instruments. In the design of equipment employing magnetic cores, it is necessary to know the relation between the magnetic properties of the core and the magnetic properties of the material. This paper describes the effect of the dimension ratio of the core on the magnetic properties for the sinusoidal flux waveform drive condition. In carrying out the analysis, a mode analysis in which the magnetization characteristics are approximated by a piecewise‐linear curve is adopted. From the results obtained by the numerical analysis, local flux waveforms and exciting current waveforms of the core are shown. As a result, the relation between iron loss and magnetizing apparent power of the core and the dimension ratio is derived. These results were confirmed by experiments.

Influence of dimension ratio and magnetizing conditions on the ac magnetic properties of tape-wound ring core

“…However, these have not been made clear. For the tapewound ring core, which is a basic shape and is used as a magnetic device in various measuring instruments and electrical apparatus, the authors have previously shown the fundamental items of the relations between the core dimension ratio and the ac magnetic properties in the case of basic magnetizing conditions of commercial frequency and sinusoidal voltage [2]. Moreover, we have also reported the relations between the magnetizing conditions and the ac magnetic properties for excitation by a distorted-wave voltage [3].…”