The robustness against static eccentricity has caused axial flux resolvers (AFRs) to be proposed in high performance motion control systems. In this paper, the dynamic performance of AFR is predicted using a mathematical model based on d-q axis theory. In particular, the proposed model takes into account the stator currents of brushless AFR and it will be able to model the effect of static eccentricity. Furthermore, it is used to compute the dynamic and steady state equivalent circuits. Finally, the studied AFR is fabricated and tested. Good agreement between simulation results and experimental ones confirms the proposed model.
PL
Analizowano resolver z osiowym strumieniem AFR. Na podstawie modelu matematycznego oceniono właściwości dynamiczne. Szczególną uwagę zwrócono na prąd stojana i efekt ekscentryczności. Przedstawiono układ zastępczy. Zbadano model.
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Transmembrane translocation of polyion homopolymers takes place in the case of polyanionic polysialic acid (polySia), polyanionic polynucleotides and polycationic polypeptides. The purpose of this work was to determine the role of membrane electrical parameters on the kinetics of polyion translocation, the influence of polysialic acid on ion adsorption on positively charged membrane surface and the dynamics of the phospholipid hydrocarbon chains and choline group by using 1H-NMR. The analysis of polyion translocation was performed by using the electrical equivalent circuit of the membrane for the initial membrane potential equal to zero. The changes in polysialic acid flux was up to 75% after 1 ms in comparison with the zero-time flux. Both a decrease of membrane conductance and an increase of polyion chain length resulted in the diminution of this effect. An increase of praseodymium ions adsorption to positively charged liposomes and an increase of the rate of segmental movement of the -CH2 and -CH3 groups, and the choline headgrup of lipid molecules, was observed in the presence of polySia. The results show that the direction of the vectorial polyion translocation depends both on the membrane electrical properties and the degree of polymerization of the polymer, and that polysialic acid can modulate the degree of ion adsorption and the dynamics of membrane lipids.
W artykule przedstawiono układ do automatycznego rozpoznawania typu przetwornika prądowego podłączonego do urządzenia pomiarowego oraz sposób wyznaczania parametrów obwodu zastępczego RLC przetwornika. Rozwiązanie dedykowane jest do zastosowania w obwodach pomiarowych urządzeń automatyki i zabezpieczeń sieci elektroenergetycznych oraz w przenośnych i stacjonarnych urządzeniach pomiarowych.
EN
In the paper the circuit for automatic detection of the type of current transducer connected to the measurement device as well as the method of estimating the parameters of its electrical equivalent electrical circuit have been presented. The solution is dedicated for use in measurement circuits of protection and automation devices used in power industry as well as other measurement devices.
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