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Historia tranzystora polowego, początki i geneza powstania

Czupryniak J., Namirowska P., Ossowski T.

Technical Issues

2017

nr 1

28--33

Automation diagnostic methods and techniques of environmental monitoring combined with higher precision, sensitivity and selectivity of the currently available detection methods evokes a growing interest of medicine and medical diagnostics to produce the miniaturized diagnostic devices and technology which enable automation of medical procedures. Application of different sensors including chemical ones for detecting substance such as: peptides, proteins, ions, heavy metals in biological systems in which is low concentration of analyte is observed, forces us to use a miniaturized chemical nanosensors with high sensitivity and selectivity. This type of sensors are FET, ISFET and MOSFET. The nano-diagnostic devices with ability of molecular recognition that’s today's world most important analytical challenge for designers and chemists in order to obtain rapid and cheap diagnostic methods. In this paper we present the principle of FET and the genesis of the measuring system.

Unipolarny układ zasilania silników reluktancyjnych

Tomczewski K.

Pomiary Automatyka Kontrola

2011

R. 57, nr 2

138-141

W artykule przedstawiono unipolarny układ zasilania umożliwiający rozszerzenie zakresu prędkości silników reluktancyjnych. Badano wpływ zastosowania nowego układu na uzyskiwane wartości prądów w czasie zasilania cewek, oraz na czas zaniku prądu po wyłączeniu zasilania. Obliczenia wykonano dla izolowanych magnetycznie obwodów o stałych parametrach oraz dla czteropasmowego silnika krokowego. Wyniki obliczeń porównano z uzyskanymi przy stosowaniu typowych układów zasilania. Pokazano możliwość znacznej poprawy warunków zasilania silnika w górnym zakresie prędkości.

The paper presents the influence of a modified supply system on current waveforms in inductive-resistive loads. Modification of a supply system dedicated for reluctance stepper and switched reluctance motor based drives was investigated. The modification influence on current values obtained during the step as well as current fall-off time after switching off the power was examined. Two configurations of the system were investigated: a system with common additional section (Fig. 8) and a system with independent supply sections (Fig. 15). Both influence the motor torque significantly. Calculations were carried out for constant-inductance, magnetically isolated circuits and a four-phase stepper motor. The current waveforms obtained from various systems for the same load and transistor keying frequency are presented. The possible significant improvement in power conditions at high-speed range is described in the paper. Application of the system shown in Fig. 8 results in the start up frequency higher by 65%. The best results were obtained for the supply system with independent supply sections. The presented results come from initial investigation of the designed system.