| 摘要 |
PROBLEM TO BE SOLVED: To make it easy to design and manufacture a reactor for electric power with a special inductance-current characteristic by eliminating a magnetic gap of an iron core of the reactor for electric power and preventing magnetic noise from being generated. SOLUTION: A dust core is used having a closed magnetic path with no magnetic gap. An iron core structure 1 is constituted by stacking a plurality of dust cores 1A and 1B differing in magnetic permeability one over the other across a magnetic shield layer 2. Coils 2, 3, and 4 (for three phases) are wound around the dust cores 1A and 1B of the iron core structure 1 in common. The dust cores 1A and 1B are made to generate pieces of magnetic flux having different values depending upon iron core characteristics with currents flowing to the coils, thereby varying the inductance between coil terminals with current values. COPYRIGHT: (C)2006,JPO&NCIPI
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