| 摘要 |
PROBLEM TO BE SOLVED: To operate a coil system with commercial frequency and avoid biased current by arranging two pieces of element wires in the hollow of almost a cylindrical hollow magnetic body by making the current flow in opposite directions to one another. SOLUTION: An array is provided by using a plurality of iron cores which has a through hole at the center. Two pieces of element wire 1-6 penetrate the hollow of each iron core, and the current directions of the two pieces of element wires are made opposite to one another in the through hole. At that time, the number of the element wires 1-6 for the (n)×(n) number of iron cores is 2n. For the element wire 1-6, the part which penetrates the iron core is not necessarily in a superconductive condition, when the wire is electrically insulated from each other. In such a case, the element wire 1-6 is made of copper, etc., instead of NbTi, etc. Thus, bias current in the element wire is suppressed and reduced and extremely small-sized iron core is obtained. |
