| 摘要 |
PROBLEM TO BE SOLVED: To reduce magnetic path and also reduce loss of a cut-core, of which the joining system is the lap bonding system. SOLUTION: Both sides of side 12a where the butting portions of steel plates exist, and side 12b facing to the side 12a in the winding iron core 12 of a polygonal shape, are respectively defined as diagonal sides 12c, 12d. Thus, the magnetic path can be reduced more than that of the related art where this part is formed as an arcuate part. Moreover, length C<SB>11</SB>of at least one diagonal sides 12c of the diagonal sides 12c on both sides of the side 12a, where the butting portion exists is set shorter than the length C<SB>12</SB>of the other diagonal side 12d. Accordingly, the number of sheets of the long-distance area can be reduced between the butting portions, and thereby, loss can also be reduced. In addition, since the length C<SB>12</SB>of the diagonal side 12d, other than the diagonal side 12c where the length C<SB>11</SB>is reduced, can be set as the maximal value, length of steel plate can be shortened, namely magnetic path can be reduced, and thereby loss can also be reduced. COPYRIGHT: (C)2007,JPO&INPIT
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