Contents
The temperature field over the whole cross section of an asynchronous electric machine (windings, stator and rotor core, insulation, air gap) is calculated under both steady-state and transient conditions. Thermal sources (copper losses) depend on rotor slip, deep-bar effect and windings temperature. All these quantities are, in the transient condition, functions of time. The thermal part of this coupled electro-thermal process is solved by the finite element method (FEM), while the electromagnetic part is dealt with by the equivalent circuit of the asynchronous machine. The air-gap problem is specially treated. The presented method can be applied to other electric machines having negligible axial thermal heat flow.
Übersicht
In der vorliegenden Arbeit wird das Temperaturfeld über den ganzen Querschnitt einer Asynchronmaschine (Nutkupfer, Ständer- und Läuferblechpaket, Isolationen, Luftspalt) berechnet. Die Berechnung wird für stationäre und transiente Zustände durchgeführt. Die Wärmequellen (Kupferverluste) sind vom Schlupf, der Stromverdrängung und den Kupfertemperaturen abhängig. Alle diese Größen sind während der transienten Vorgänge zeitabhängig. Der thermische Teil dieses elektrisch-thermischen Prozesses wird mit Hilfe der FEM, der elektromagnetische Teil mit Hilfe des Ersatzbildes der Asynchronmaschine berechnet. Besonders wird das Problem des Luftspaltes behandelt. Die Methode kann bei allen Maschinenarten mit vernachlässigbaren axialen Wärmeströmen angewendet werden.
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Hatziathanassiou, V., Xypteras, J. & Archontoulakis, G. Electrical-thermal coupled calculation of an asynchronous machine. Archiv f. Elektrotechnik 77, 117–122 (1994). https://doi.org/10.1007/BF01578534
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DOI: https://doi.org/10.1007/BF01578534