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National Repository of Grey Literature

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	Contribution to Problems of Zero-Sequence Component in Electrical Machines Schreier, Luděk ; Chomát, Miroslav For their reliability and relatively low production costs, three-phase induction machines are widely utilized in variable speed drives as drive units. The stator is fed from a solid-state frequency converter. At operation of these drive systems however, some part of feeding converter can fail, e.g. one of its legs.In order that the drive can be kept in operation in some cases, the converter is reconfigured. Detailed record
	Comparism of Diagnostic Methods Employing Matrix of Photodiodes and Linear Camera Šonský, Jiří Both devices are composed of array of PIN photodiodes, amplifiers, multiplexer and analog-digital converter. Diferent layout of these devices lead in to diferent overall performance. Linear camera outperformed the photodiode matrix in horizontal resolution and total data rare, PIN photodiodes have higer sensivity, double line frequency and many times longer acquision time. Detailed record
	Diagnostics of Breakdown in Electric Arc Exposed to External Magnetic Field Hlína, Jan ; Šonský, Jiří An arc in external magnetic field acquires a helical shape and when the magnetic field exceeds a critical value the arc starts to oscillate. The oscillations may lead to many types of shortenings (breakdowns) between the adjacent windings of the arc path. We have investigated experimentally the steepness of the voltage fall reflecting the breakdown and the influence of mean arc voltage and electrode polarity on this characteristic. Detailed record
	Control of Active Power filters by Using dSPACE 1103 board Škramlík, Jiří ; Valouch, Viktor Paper presents experience with the dSPACE 1103 board used as a controller of active power filter for the compensation of current harmonics of a non-linear load. Results of simulation and laboratory tests are presented and discussed. Detailed record
	Electromagnetic emissions of a trolley-bus with IGCT-based drive Doležel, Ivo ; Jehlička, Vladimír ; Škramlík, Jiří ; Valouch, Viktor The paper describes utilisation of a new IGCT-based element in DC inverter designed for feeding of a DC traction motor for trolley-bus. It deals with emissions of electromagnetic field (EMI) produced by operation of the inverter EMI was measured and calculated on a simplified model. Realised was a preliminary best during a low-speed trip within frequency range 150 kHz - 30 MHz. The results exhibit a good accordance with European Standards EN 50121-2, EN 50121-3-1. Detailed record
	EMI Generated by Trolley-Bus with IGCT-Based Drive Budek, P. ; Doležel, Ivo ; Jehlička, Vladimír ; Škramlík, Jiří ; Valouch, Viktor The paper describes the employment of a new IGCT element in a dc chopper designed for feeding a dc trolley-bus traction motor. The discussed radiated EMI noise generated during the chopper operation was measured and calculated on a simplified model. The preliminary slow moving tests within the range 150 kHz - 30 MHz were performed. The results of the measurements of magnetic field exhibit the compliance with the European Standards EN 50121-2, EN 50121-3-1. Detailed record
	IGCT-Based Traction Drives for City Mass Transport Bartoš, Stanislav ; Jehlička, Vladimír ; Valouch, Viktor ; Večerka, Tomáš ; Bureš, J. ; Kalčík, K. ; Venhoda, E. The paper introduces a sunrise power semiconductor switching device called IGCT. Converters based on IGCTs might contribute in near future to the quality of electric drives. Detailed record
	Transfer of the Noise and Vibration from the Motor to the Passenger Space Budek, P. ; Chmelíček, M. ; Hejman, M. ; Jehlička, Vladimír Development of the new trolley-bus or change of its structure requires the noise and vibration measurements. the goals of the manufacturer is to reduce the noise level in space of passengers in the trolley-bus. The paper describes the process of identification of the noise sources, investigation of the vibration transfer and simulation of the structural behaviour by FEM program COSMOS/M. The computation-based structural changes are suggested. Detailed record
	Modern Switching Devices Will Improve Electric Vehicles in City Mass Transportation Bartoš, Stanislav First, the lecture outlines the prospective trends in city mass transportation. In further sections, principles of electric traction drives are discussed. As the lecture is intended for broad technical audience not specialized in power electronics, only the most elementary principles of converters are explained. Their improvement is based on the employment of IGBTs and IGCTs, which are the state-of-the-art semiconductor power switching devices. Detailed record
	Control of Active Power Filters by Using dSPACE 1103 Control Board Škramlík, Jiří ; Valouch, Viktor The paper presents some results obtained with the dSPACE 1103-based control system of a parallel Active Filter (AF) compensating current harmonics of a non-linear load. The main aim of the study was to evaluate the possibilities of the system dSPACE 1103 to control fast dynamics of the AF. Detailed record

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