| 摘要 |
PROBLEM TO BE SOLVED: To provide a cheap reactor core wherein its manufacturing cost is reduced by improving its working efficiency and shortening its working term. SOLUTION: In a reactor core, the coupling portions whereby upper and lower yokes 5, 6 and both side-leg yokes 9, 9 are coupled to each other are made frame-form to provide gaps G at its four corners. The sizes of the gaps G are all made not larger than 20 mm.
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