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1
Content available Design of switched reluctance machines for industrial applications
Wichert T., Kuß H.
Maszyny Elektryczne : zeszyty problemowe
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2010
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Nr 87
69-74
EN
Switched Reluctance Machines (SRMs) applied in adjustable speed drives are receiving during the last two decades considerable attention from industry since they are characterised by rigid construction, high operation reliability, high efficiency and last but not least low manufacturing costs. The successful realization of a SRM drive for industrial application demands inter alia of the determination of the best motor construction from the point of view of the requirements of considered drive. A new hybrid design method for SRM drives with application of analytical calculation methods, finite element method and simulation models is proposed in this paper. The calculation/design system is characterised by important effectivity and reliability. The correctness of the proposed design algorithms is verified by laboratory tests made on two motor prototypes manufactured for concrete industrial applications.
2
Content available Cooling of electric machines by multi-phase systems
Schuffenhauer U., Urbański W., Michalke N., Kuß H.
Maszyny Elektryczne : zeszyty problemowe
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2010
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Nr 88
97-102
EN
A high potential for increase the power density and the efficiency of electrical machines consists in a improved cooling. A new implementation approach is in the pouring of the electric components into a medium, which guarantees a better heat emission to the case in a combined manner with a new cooling concept by utilization of change its phase, with that maximum loads can be absorbed thermally. At a realistic experimental model on the basis of a 3 kW induction motor of assembly line production the use of the different physical effects during heat storage was examined for the suitability for an electrical machine, when this equipped with chambers with technical paraffin were. There are represented the experimental investigations at a modified induction motor and with its result the potential of this development. Measurement and computations show the better cooling of the solid one and both the liquefied material compared to air circulation. On the other hand, the effect of the fusion heat is still insufficient because of bad heat conduction qualities of PCM material for the practical application. By means of thermal FEM simulations the experiments are supported and possibilities for new materials examined.
3
Content available Additional losses by magnetic field harmonics in the rotor bars of asynchronous machines and their influence
Schuffenhauer U., Kuß H.
Electrical Power Quality and Utilisation. Journal
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2006
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Vol. 12, nr 2
117-120
EN
Optimizing the efficiency of modern asynchronous machines requires the knowledge of the particular loss components. In this contribution a method shall be presented, where by the transient FEM-calculation the copper losses in the rotor bars by harmonic field effects and the consequential originating harmonic currents can be estimated. By this way the determination of the current density of the rotor current harmonics is carried out along the height of the rotor bar. The loss distribution from the bar bottom to the bar tip is derived from the effective current density and its spatial distribution. The calculation shows, that the additional losses represent a considerable quantum of the total losses, they are partly in the range of the fundamental copper losses and therewith they have a lasting effect on the efficiency of the machine. By convenient geometrical actions a reduction of the additional losses is possible.
4
Content available Determination of the iron losses and rotor additional losses in electric machines by advanced methods
Schuffenhauer U., Kuß H.
Prace Instytutu Elektrotechniki
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2005
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Z. 223
91-112
EN
New demands of modern electric drives cause ever new machine designs. Simultaneous the utilization is increasing. This induces, that usual algorithms for the loss calculation are not valid any more in the full extent. The construction of prototypes should be dispensed with, so accurate calculation methods are necessary. In this contribution methods are presented for calculation of the iron losses of electrical machines. In addition to the short consideration of conventional analytical methods new procedures are regarded, with which both the losses through harmonics and the losses in the rotor and inactive parts of the magnetic circuit can be computed by utilization of the results of static or transient FEM computations.
PL
Nowe wymagania stawiane napędom elektrycznym powodują, że zachodzi potrzeba wykonywania nowych projektów. Jednocześnie zwiększa się stosowanie procesów symulacyjnych. To sprawia, że zwykłe algorytmy obliczające straty nie są wystarczające. Względy oszczędnościowe powodują, że wskazane jest obywanie się bez konstrukcji prototypów dlatego też dokładne metody obliczeń są konieczne. W artykule przedstawiono metody obliczające straty w rdzeniu maszyn elektrycznych. Dodatkowo wzięto pod uwagę klasyczne metody analityczne oraz nowe procedury, w których straty od harmonicznych i straty w wirniku oraz w elementach nieaktywnych obwodu magnetycznego mogą być obliczane przy zastosowaniu metody elementów skończonych.
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