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In this work, a dynamic model of the salient-pole synchronous machine is developed using space vectors referred to the stator and rotor frames.. The space vector model of the salient-pole synchronous machine is a useful development tool for vector control applications. Finally, to prove some advantages of the proposed model, a Direct Torque Control (DTC) is analyzed using this technique. The differentent advantages obtained with this modeling technique can be extended to other electric system components, such as transformers, transmission lines, loads, electronic power converters and other alternating current machines. [ABSTRACT FROM AUTHOR]

An analysis of the conmutation processes in different modes of operation (inductive, capacitive and resistive) of the paralell-resonant inverters is presented in this paper. First the ideal and real behaviours of its semiconductor components are considered and the iddle components are excluded. Also the modes of operation corresponding to the proper MOSFET transistors trigger angle are analyzed. Second, the case in which the value of idle inductances of the circuit cannot be neglectable is considered, analysing also why are not commendable in this conditions the common conmutation strategies. A calculation strategy for proper moment of the transistors' triggering which provides a sure opperation in any working instant of the inverter circuit in optimum commutation mode is verified. Several simmulations that confirms the results validity using ORCAD software, are performed. [ABSTRACT FROM AUTHOR]

In this article, it will be carried out an itemized analysis of the welding sources evolution in their last stage, to outline the future forecasts that are expected in this field that so much importance has at the present time. On the other hand, and keeping in mind the new requirements of efficiency and reliability that are demanded to the welding sources, is necessary to analyze if the technology of production of these sources is as mature as it is said or it is necessary to impel it more in some concrete aspects of the same one. [ABSTRACT FROM AUTHOR]