Abstract
AN article on this subject in the Electrical Review of July 31 opens with a brief survey of overheating due to dirt or other foreign matter obstructing the ventilating pipes, ducts and passages of motors. Mention is made of the lagging effect which waste materials may have on the motor casing, and useful suggestions are given for the improvement and maintenance of ventilation. Since the rate of heat generation is proportional to the square of the load, protection against overloading is advised. It is suggested that motors be protected by a tripping device operating at 25 per cent sustained overload, or thermostatically controlled if subjected to large rapid load fluctuations. The liability of cotton insulation to char at about 100° C. is mentioned in stressing the safe temperature rise of a winding as being about 72° C. above that of the surrounding atmosphere.
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Overheating of Electric Motors. Nature 150, 287 (1942). https://doi.org/10.1038/150287b0
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DOI: https://doi.org/10.1038/150287b0