Abstract
This paper presents an investigation of the heat transfer and fluid flow process in a small universal electric motor, which employs a stamped metal axial flow cooling fan. A three-dimensional conjugate computational model is developed. An experimental testing system is built to measure the flow rates of cooling air at various rotation speeds. The agreement between the experimental data and the model predictions is reasonably good. The numerical approach presents detailed flow structures, temperature distributions, and quantitative heat flux data. The cooling flowpath, heat transfer process, and the fluid driving of the cooling fan are analyzed. Suggestions for universal motor development and cooling design are given.
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