| 摘要 |
<p>PROBLEM TO BE SOLVED: To increase the width dimension of magnetic steel plates, having a minimum width to be laminated at outermost sides to such an extent that no improper bending, bending or the like is produced, while securing space factor for a central core. SOLUTION: When a plurality of magnetic steel sheets 31 are laminated on a central core 18 to be accommodated within a secondary side spool 22 in the radial direction of the core 18 for forming a nearly cylindrically-shaped core, either of odd-number sheet and even-number sheet lamination methods is employed, which will have the larger of space factors for the central core 18 with respect to the core accommodation space in the secondary side spool 22. In the odd-number sheet lamination method, the number of laminated magnetic steel sheets 31 is set to odd number, a single magnetic steel sheet 31a having a maximum width is placed in the center of the central core 18 and a width dimension of magnetic steel sheets 31b to be laminated at the outermost sides, is set at 3 mm or more. In the even-number sheet lamination method, the number of laminated magnetic steel plates 31 is set to even number, two magnetic steel sheets having a maximum width are placed in the center of the central core 18, and a width dimension of magnetic steel sheets having a minimum width to be laminated at the outermost sides are set at 3 mm or larger.</p> |
