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3 Journal of Applied Computer Science

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Computer aided design of dynamic analog converters of square and square root

100%

Kawecki L. , Niewierowicz T.

tom Vol. 8, nr 1

37-48

This paper presents the design and computer simulation of two dynamic analog nonlinear converters: one of square and the other of square roof. These converters were registered as invention patents in the Mexican Institute of Industrial Property. The purpose of the design and simulation of the behavior of the electronic circuits in the converters are the determination of their appropriate structures for prototype elaboration and manufacture.

Digital model of temperature fields in electrical machines

100%

Niewierowicz T. , Kawecki L.

tom Vol. 7, nr 1

31-44

The paper presents a complete variable structure mathematical model of the temperature fields inside stators and rotors of rotational electric machines that work in different modes, including the interrupted work with different relationship between the work and the rest time, and taking into account the change of temperatures of the air that circulates in the air gap. The algorithm developed mainly for a case of two - material cylindrical wall of simple geometry can also take into account different geometry of the stator and rotor. The results of investigations of temperature fields are also presented to determine the influence of the temperature changes in the air gap on the maximum temperatures inside stators and rotors. These investigations aim at establishing the optimal design of cooling systems for rotational electric machines.

Identification and sensitivity analysis of synchronous machine d-axis parameters

80%

Niewierowicz T. , Escarela-Perez R. , Campero-Littlewood E.

tom Vol. 10, nr 1

91-103

A sensitivity analysis is performed to study the characteristics of the parameters of two-axis equivalent circuits (used in the modelling of solid rotor synchronous machines). The equivalent circuit parameters are determined by using a hybrid genetic algorithm, which also gives the right number of circuit damper branches that must be used to accurately reproduce the standstill frequency response of the synchronous machine. The sensitivity analysis clearly shows the relative importance of each parameter within the fitness Junction used in the identification process. Hence, it is observed that care must be taken in the identification process since the fitness function has very low sensitivity to some parameters. The results show that a sensitivity analysis of the circuit parameters could lead to a better understanding of the accepted two-axis equivalent circuits.