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Author

M C Martinez

Bio: M C Martinez is an academic researcher from University of Valencia. The author has contributed to research in topics: Numerical solution of the convection–diffusion equation & Magnetic field. The author has an hindex of 1, co-authored 3 publications receiving 1 citations.

Papers
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TL;DR: In this paper, the diffusion equation of the electromagnetic field in ferromagnetic materials is studied and the main difficulty in this equation lies in the nonlinear magnetic characteristic, that results in a nonlinear diffusion equation.
Journal ArticleDOI
TL;DR: In this paper, two low-cost measurement systems that use active circuits in the power stage are proposed for the DC and AC characterisation of industrial soft and/or hard ferromagnetic materials.
Abstract: Two low-cost measurement systems that use active circuits in the power stage are proposed for the DC and AC characterisation of industrial soft and/or hard ferromagnetic materials. For the DC measurements, the discrete variation of the point-by-point method is simulated by a very low frequency triangular wave. The problems encountered are pointed out and the solution proposed is tested experimentally. The AC source system combines a power amplifier and an operational amplifier with a feedback technique. This allows the option of selecting the power source to be either a constant voltage or a constant current source. Results obtained using these methods on a core sample of mild steel are shown to bring out the performance of the system.

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01 Nov 1991
TL;DR: Theoretical models for rail internal self-inductance and resistance are proposed in this article, which include material saturation and hysteresis, using experimentally derived ferromagnetic material B-H loops.
Abstract: Theoretical models for rail internal self-inductance and resistance are proposed which include material saturation and hysteresis. Model data are obtained using experimentally derived ferromagnetic material B-H loops. Analytical methods for deriving the impedance variations with current and frequency for large-signal AC and incremental AC superimposed on DC excitation are in agreement with experimental measurements.

47 citations