全閉形誘導電動機の空気流と熱コンダクタンス

概要

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Heat transfer coefficients of air-cooled fins which located on outer surface of a totally enclosed induction motor were measured. It was found that heat transfer coefficient decreases with fin distance. And it was also found that increasing the axial length of the fan cover(i.e., so that the fan cover overlaps the fin)effectively increases the average heat transfer coefficient of the outer fins. Internal flow induced by the rotor fan inside a bracket coincides with the rotational speed of the rotor fan. Flow between the stator coil end and the housing in the motor is small, so a cooling structure with an inside ventilation passage for air flow effectively increases the heat transfer of the stator coil. The effect of resin(varnish)between the stator and the motor housing on the thermal-contact conductance was also investigated by using an actual motor. The thermal-contact conductance of the motor with resin was 1.58 times higher than that of the motor without resin.
一般社団法人日本機械学会の論文
2000-08-25