A method of approach to transient eddy current problems coupled with voltage sources

This paper presents a new method of approach to transient eddy current problems with voltage excitations coupled by indirect methods. In linear cases, the magnetic vector potential is separated into two components to avoid redundant computation and thus hugely reduce the total CPU time. In nonlinear cases, either an elemental time-domain piecewise linearisation method or a Newton iterative method is adopted. A restarting function and second order interpolations are incorporated into an incomplete Choleski conjugate gradient solver to accelerate the convergence. The method is applied to the modelling of a prototype tubular linear induction actuator. Results have shown that the method proposed is very efficient.