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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

Internal air flow modeling for an open-type induction motor based on equivalent thermal circuit method

Chiwon Kim
School of Mechanical Engineering, Hanyang University, Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea

Kwan-Soo Lee
School of Mechanical Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul, 133-791, Korea

Abstract

A thermal circuit method was introduced to model the non-circulating internal airflow of a motor for the equivalent thermal-resistance-based method. The concept of unit structure, which is the most basic concept of the thermal circuit method, was defined for the solid and fluid regions. The thermal resistances of the unit structures were classified as body and surface thermal resistance types based on the unit structure concept. The heat capacity thermal resistance was defined to express the thermal circuit of heat transport via the internal airflow with an open flow path. To improve the accuracy of temperature prediction for the fluid region, a temperature-fitting constant was defined and an iteration algorithm for the constant was suggested. In addition, the thermal characteristics of an open-type, air-cooled induction motor were analyzed using the thermal circuit method. The results of the model were verified using computational fluid dynamics (CFD) and experimental results. The results of a cooling path analysis for each fluid region were compared with the results of our model and CFD results. The thermal circuit model had an error of less than 2°C for the temperatures in the internal air regions, compared with the CFD and experimental results. The cooling path analysis using our model had an error of less than 3% compared with the CFD results. Therefore, the thermal circuit method is advantageous because it has high accuracy, and uses relatively low levels of computational resources, compared with the CFD method.

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