Hitachi Metals, Ltd.

Toru Abe

Masayoshi Sato

Kohei Ito

Keiko Kikuchi

Hisao Kurosawa

Hiroki Hamakake

Provided is an annular reactor core formed of a U-shaped core and core legs. Core joints including end portions and two protrusions form the U-shaped core. Between the protrusions of these core joints, a plurality of (two) core legsformed of core blocks are arranged so as to have gaps and the protrusions. The ratio A/B, which is a ratio of the length A of the protrusions of the core joint to the average length B of the core blocks constituting the core legs in a magnetic path direction, is optimized so as to be not less than 0.3 but not more than 8.0, whereby an increase in copper loss due to leak magnetic fluxes of the gap portions is suppressed.

Reactor core and reactor

In growing an oxide single crystal such as a garnet single crystal or ferrite single crystal by the liquid epitaxial process, the Bridgman process or the like, the melting-out of a platinum or platinum-based alloy-made crucible holding a melt for growing the crystal therefrom is prevented by bringing an electrode in contact with the melt or dipping the electrode into the melt in oxygen, air or an inert gas, applying electric current through the melt between the electrode and the metallic container and controlling the current so as to keep it at nearly zero.

Growing community of inventors

Saitama, Japan

Toru Abe