Numerical solution of time dependent magnetic fields taking into account the motion of parts of construction

In many technical devices, such as magnetic systems, switches etc., the knowledge of time dependent field distribution is of great importance for the constructor. It makes it possible to investigate the behavior of the device under different operating conditions before it is built and gives valuable insights of the function. By this approach improvements can be determined and the time and cost can be saved. The paper outlines a computer program for the calculation of 2D time dependent magnetic fields using the finite difference method. All significant influences such as the nonlinearity of material characteristics, arbitrary distribution of exciting current densities or voltages, excitation by a coil with given voltage and motion of parts of construction can be taken into account. The velocity of motion may be a given function of time or may be obtained by solving the equation of motion. The program contains both a preprocessor and a sophisticated post-processor, which allows one to calculate any quantity as a function of time, which can be derived from the vector-potential.