| 摘要 |
<p>A three-phase and three-leg core of a core-type transformer comprising three main legs formed of a plurality of steel sheets stacked in the form similar to a circle in cross section and spaced each other, and upper and lower yokes formed of a plurality of steel sheets stacked in the form similar to a circle in cross section for magnetically connecting the main legs. The steel sheets for forming each main leg are cut diagonally at opposite longitudinal ends thereof, and each yoke is formed of two types of steel sheets, one type being of diagonal cuts disposed at opposite longitudinal ends thereof to provide steel sheets of the trapezoidal shape and the other type being of a diagonal cut disposed at one of opposite longitudinal ends thereof and a right angle cut disposed at the other longitudinal end thereof to provide steel sheets of the trapezoidal shape. The steel sheets for forming the upper and lower yokes have a width greater than the width of the steel sheets for forming the main legs. The opposite longitudinal ends of the steel sheets for forming the center main leg are cut diagonally at an angle less than 45 degrees and joined diagonally and at a right angle to the steel sheets for forming the upper and lower yokes through the entire surfaces. The steel sheets for forming the two outer main legs are cut diagonally at opposite longitudinal ends thereof at 45 degrees and joined diagonally to the steel sheets for forming the upper and lower yokes in an area in which the yoke steel sheets are cut diagonally. This construction is conducive to reduced iron loss and to form the main legs of a small diameter.</p> |
