無鉄心形超電導変圧器の磁界および電磁力の解析

抄録

The AC superconducting power apparatus have been investigated actively in recent years. The air-core superconducting power transformer to which the authors are paying attention is one of such superconducting apparatus. The air-core superconducting transformer has no iron loss, magnetic noise and harmonics problem, which are caused by the iron-core, and it has more possibilities of reduction of loss, size and weight than the conventional and iron-core superconducting power transformers. However, since the air-core transformer has no specific path for the magnetic flux, the magnetic field pro-duced by its superconducting windings acts directly on the windings. Therefore, the investigations of the electromagnetic force, loss and stability of the superconducting windings are very important. In order to investigate these points, the quantitative analysis of the magnetic field acting on the superconducting windings is necessary.
In this paper, a calculation method of the magnetic field is presented. Then, by using this calculation method, the magnetic field and electromagnetic force acting on the superconducting wire are analyzed. From the results of these analyses, it is clarified that the distribution of the amplitude of the magnetic field and electromagnetic force acting on the wire are not uniform. It is also clarified that the magnetic field acting on wire under load has a rotating component in addition to the alternating component.