Magnetic Field Analysis of AirCore Superconductin nansformer.pdf

4124 IEEE TRANSACTIONS ON MAGNETICS, VOL. 31, NO. 6, NOVEMBER 1995 Analysis of Air-Core Superconductin nansformer Hiroshi Yamaguchi, Hajime Morimoto, Yukihiko Sato and Teruo Kataoka Dept. of Electrical Electronic Eng., Tokyo Inst. of Tech., 2-12-1 Ookayama Meguro-ku, Tokyo 152, Japan Abstract -In the applications of the superconduct- this coil on X - Y plane. ing wires to the ac power fleld, the magnetic fleld The magnetic field H = [Hx,Hy]* produced at the analysis is very important in order to investigate their position (2,p) by this one-turn coil is calculated by using power loss and stability. In this paper, a calculation Biot-Savart’s law and is expressed as follows. Here, the method of magnetic fleld in the air-core transformer, suffixes ’X’and ’Y’ indicate the X-axis and Y-axiscom- which is one type of the superconducting transformer, ponents, respectively. is introduced. Then, based on this method, the mag- if x # 0, netic field acting on the transformer winding is ana- lyzed. Results of analysis And that the magnetic fleld of the air-core superconducting transformer does not distribute uniformly and that the magnetic flefd under if 3:= 0, load has a rotating component. R ~ I 1. INTRODUCTION [ 2 ] = 2(y2+ R2)3[ !] where c2 = z2 +y2, C = 22cR/(z2 + y2 + R2)and k 2 = The superconducting power transformer[l]-[7], which is