Conductor In External Magnetic Field Research Articles

Estimation of magnetization loss at angular magnetic field using perpendicular magnetization loss in striated and transposed YBCO coated conductor

The magnetization loss in a perpendicular external magnetic field is main AC loss of YBCO coated conductor for AC power applications. One of solutions for decreasing the magnetization loss is to make striations on it and to transpose the striated coated conductors. We measured the magnetization losses of several samples made by striated and transposed YBCO coated conductors in external magnetic field with an inclined angle for wide face of YBCO coated conductor. We compared the measured magnetization loss at an arbitrary direction in the magnetic field with those measured in a perpendicular magnetic field at the same value of perpendicular component of the external magnetic field. The results agree well with each other in all samples. This means that the magnetization loss in any directional applied magnetic field can be estimated by using only the perpendicular loss data.

Numerical analysis of AC losses in YBCO coated conductor in external magnetic field

For electric power applications of YBCO coated conductors, the reduction and estimation of AC losses are important issues. This paper reports numerical analysis of electromagnetic phenomena in YBCO coated conductor with particular emphasis on AC loss characteristics. FEM analysis of electromagnetic fields was carried out with strongly nonlinear E– J characteristics of superconductor, and the dependence of AC losses on angle of external magnetic field was investigated. The results indicate that the AC losses depend almost only on the perpendicular component of external magnetic field, while at a higher magnetic field the AC losses also slightly depend on the parallel component.