Abstract
In this paper, a method for transient eddy current analysis based on boundary element method is presented and a reduction method of boundary element model in transient analysis is investigated. The frequency eigenmodes are used for the integration with respect to time, and spatial eigenmodes are used for the reduction of the boundary element model having spatial symmetries. When accurate eigenvalues and eigenvectors are obtained for the state equations of the computation model, the integration with respect to time can be obtained analytically and accurate computation results are obtained. On the other hand, the reduction method using spatial symmetries is introduced to reduce the computational errors caused by numerical treatment and to reduce the required computer resources: computation time and computer memory storage. The applicability of the reduction method for transient analysis is discussed and verified by using some examples.
