Showing papers by "Ju Lee published in 1999"
18 May 1999
TL;DR: In this article, the performance of eddy current brake according to the design parameters is analyzed by using 2-dimensional Finite Element Method (2-D FEM) in order to predict the effect of the design parameter.
Abstract: This paper describes the performances of eddy current brake according to the design parameters. The characteristics are analyzed by using 2-dimensional Finite Element Method (2-D FEM) in order to predict the effect of the design parameters. The magnet stack width is determined from equivalent stack width that is calculated by solution of the field with scalar potential. The validity of available calculation program with FEM is achieved by comparing with experimental value. From the results, the optimized magnet configuration of the eddy current braking system is designed to obtain not only the maximum braking force but also the minimum attraction force.
11 citations
18 May 1999
TL;DR: In this paper, a 2D transient analysis of a superconducting AC generator (SCG) using the finite element method (FEM) is presented, where a compensated 2D model obtained by lengthening the air gap of the original 2-D model is proposed for the accurate and efficient transient analysis.
Abstract: This paper presents a 2-D transient analysis of a superconducting AC generator (SCG) using the finite element method (FEM). The compensated 2-D model obtained by lengthening the airgap of the original 2-D model is proposed for the accurate and efficient transient analysis. The accuracy of the compensated 2-D model is verified by the small error 6.4% compared to experimental data. The transient characteristics of the 30KVA SCG model have been investigated in detail and the damper performance on various design parameters is examined.
2 citations