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An induction machine with combined star-delta stator winding is analyzed in the paper. This type of winding is used in order to suppress the selected groups of higher spatial harmonics of the current layer, magnetic flux density in the air gap, and the flux in the yoke and thus lower the losses and improve the energy efficiency. The mathematical model of the machine has been developed. The possibility...
The late Variscan (327–318 Ma) Western Krušné hory/Erzgebirge pluton (Czech Republic and Germany) represents a multiply emplaced intrusive sequence ranging from low-F biotite monzogranites (with rare minor bodies of gabbrodiorites and granodiorites) to high-F topaz-zinnwaldite alkali-feldspar granites. This granite suite is characterized by progressively increasing concentrations of incompatible elements...
The mathematical model of a five-phase induction machine derived based on the theory of space vectors and symmetrical components of instantaneous values 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. It is shown that especially...
Voltage pulsations in the DC bus may develop if the voltage-source inverter is fed from an unbalanced voltage supply. Negative effects on the connected electric machine and on the power grid usually result from such operation. It is possible to entirely eliminate or at least minimize such negative effects by suitable control of the active front end of the inverter. The control range of the active...
Properties of the control method for the compensation of unbalanced voltage supply that eliminates pulsating current in the DC bus of a voltage source inverter are analyzed. These pulsations can have negative effects on operating properties of the drive as well as on the quality of power supply in the electrical vicinity of the inverter. The impact of the control method on the power factors and current...
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