通電接点における電磁反発力の三次元有限要素解析

抄録

Up to now, the quantitative characteristics of stationary electric contacts in electrical apparatus have been given by means of some calculation, based upon an artificial model of the current flow lines which highly simplifies the treatment. However, by this model it has been unable to calculate the static characteristics of the electric contacts in which the current flows complexly. We have developed a new analytical method by which the flux distribution is obtained after the current distribution in the current carrying parts is analyzed by the 3-D finite element method with edge elements. In this paper, the accuracy of the Holm's method based on a simplified contact model is examined by comparing with the calculations of electromagnetic repulsion forces by our method. In addition, the influences of the position of the contact point and the bridge length between contact members on the repulsion force are quantitatively clarified. These results, which can not be calculated by the Holm's method, are useful in the design for circuit breakers, switches, etc.