The aim of the work is the investigation of induction heating system used for
longitudinal, high frequency pipe welding.Coupled electromagnetic and
temperature field distribution has been studied in order to estimate system
efficiency and factors influencing the quality of the welding process and
required energy. The problem was considered as three dimensional. Time
harmonic electromagnetic and transient thermal field has been solved using
finite element method and COMSOL 4.2 software package.
A three-phase to single-phase matrix converter is investigated in the present paper. Based on the state matrix vector, a mathematical analysis of the converter is performed giving the relation between the sinusoidal line voltage (current) and the output voltage (current). The results of the investigation are confirmed using computer simulation of the converter by the program product Cadence PSpice
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