| 摘要 |
<p>PROBLEM TO BE SOLVED: To arrange a winding so that loss may be minimized in a limited space. SOLUTION: This flat coil is provided with a disc-like insulation layer 10 and a winding 11 of N turn (N: integer of 2 or more) that a plate-like conductor is arranged spirally on one surface of the insulation layer 10. In the winding 11, a radius of the inner circumference of a winding part of (n) turn (n: integer of 1 or more and N or less) from its inside is set to ri (n), and that of the outer circumference thereof is set to ro (n), and when a radius rmin of the inner circumference of the innermost winding part, a difference Wtotal between a radius of the outer circumference of the outermost winding part and that of the inner circumference of the innermost winding parts, and a distance D between the winding parts among the adjoining turns are given, ri (n) and ro (n) are determined so that A value represented by a formula (1) may be minimized. In this formula, ri (1)=rmin , ri (n+1)ro (n)=D, and ro (N)-ri (1)=Wtotal .</p> |
