3-D Dynamic Analysis of DC Electromagnet using FiniteElement Method with Tetrahedral Edge Elements

Abstract

To design DC electromagnets in an optimal manner, it is necessary to obtain the dynamic behavior accurately. A new method to calculate the dynamic behavior using the finite element method with edge elements has been developed. In order to verify its accuracy, the static and the dynamic behaviors of a clapper type electromagnet are calculated. The 3-D electromagnetic field analysis is carried out using the vector finite element with tetrahedral edge variables. The force is obtained by using the Maxwell stress tensor. The displacement of the armature of the electromagnet is obtained by solving the motion equation of the moving parts. The calculated results of the edge elements and that of the nodal elements are compared with the measurements. Moreover, it is clarified that the forces and the dynamic behavior can be accurately calculated using the edge elements. © 1993, The Institute of Electrical Engineers of Japan. All rights reserved.