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Planar gradiometers (PGRAD) have particular advantages compared to solenoid receiver coils in magnetic induction tomography (MIT) for biological objects. A careful analysis of the sensitivity maps has to be carried out for perturbations within conducting objects in order to understand the performance of a PGRAD system and the corresponding implications for… (More)
The paper presents the coupling of edge finite elements with a circuit by means of surface impedance boundary conditions for wave problems in the frequency domain. The coupling is based on surface impedance boundary conditions. The derivation of the method is described. A couple of numerical problems demonstrate the validity.
A finite-element method to compute the 3-D eddy-current distribution in steel laminations of electrical machines is presented and applied to the loss estimation of an induction machine. Two different eddy-current formulations, the A-V and A-T formulations, are investigated. The 3-D model is excited by boundary conditions derived from a 2-D field solution.… (More)
Two methods are presented to determine the steady-state solution of nonlinear eddy current problems, one in the time domain and another in the frequency domain. Both are based on the fixed-point technique to solve the nonlinear equations arising. In the time domain, this enables to step through one period only and arrive at steady-state. In the frequency… (More)