Abstract
The paper deals with the application of an unconventional electrical machine for circulating molten aluminium in reverberatory furnaces. Its design is based on the classical jumping-ring principle, and it incorporates some hitherto less known aspects of open magnetic circuits and of the concepts of flux spreading. Results of trials using a prototype machine are given, and the metallurgical and other benefits which accrue from its use are discussed. To maintain the electromagnetic integrity of this machine at liquid-metal temperature (> 700°C), a study of its thermal behaviour is made using a mathematical model. This model is subsequently verified by experimental observations. Proposals are made for the future use of some unconventional electrical machines in an aluminium remelt plant.
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