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Národní úložiště šedé literatury Nalezeno 3 záznamů.  Hledání trvalo 0.00 vteřin. 
Transient Behavior of Active Front-End Rectifier under Unbalanced Voltage Supply
 Chomát, Miroslav ; Schreier, Luděk ; Bendl, Jiří
Operation of voltage-source inverter supplied with unbalanced system of voltages is investigated in the paper. This situation can lead to problems in operation of an electric drive as voltage pulsations can arise in the DC-bus. Suitable kontrol methods may be applied to eliminate this effect in the aktive front-end rectifier. The paper particularly focuses on transient processes that accompany operation of the drive. They can be caused by changes in control of the drive, changes in load, or changes in the supply voltages.
Úplný záznam
Influence of Third Space Harmonic on Properties of Five-Phase Induction Machine
 Schreier, Luděk ; Chomát, Miroslav ; Bendl, Jiří
The paper deals with the necessity to consider higher space harmonic waves of a current layer, magnetic flux density and yoke flux in a five-phase induction motor fed from a tenpulse frequency converter. It is shown that especially the third space harmonic influences currents and torque of the machina considerably. The influence depends on connection arrangements of the converter and stator of the five-phase induction machine. Theoretical results are verified by experimental measurements.
Úplný záznam
Measurement on Five-Phase IM Fed from Ten-Pulse Frequency Converter
 Chomát, Miroslav ; Schreier, Luděk ; Bendl, Jiří
The mathematical model of a five-phase induction machine derived based on the theory of space vectors and symmetrical components was verified by means of comparison of simulation and experimental results. A multi-phase voltage source inverter was used to feed an experimental five-phase induction machine by ten-pulse voltage supply of constant frequency in different connection arrangements. Steady state operation was considered. The good agreement between the simulation and experimental results has proved the correct function of the mathematical and numerical model used.
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