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Effect of air-gap fans on cooling of windings in a large-capacity, high-speed induction motor

Title
Effect of air-gap fans on cooling of windings in a large-capacity, high-speed induction motor
Author
육세진
Keywords
Induction motor; Thermal; Numerical; Iron loss; Winding temperature
Issue Date
2016-05
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
APPLIED THERMAL ENGINEERING, v. 100, Page. 658-667
Abstract
A 3D computational electromagnetic-thermal coupled analysis was performed to analyze the effects of auxiliary cooling fans, called air-gap fans, on winding cooling in a large-capacity, high-speed induction motor. A novel non-uniform iron loss distribution mapping method considering time and rotation period was introduced to provide more accurate thermal modeling. Winding cooling performance in the motor was calculated and evaluated by considering the variation in thermal-fluid characteristics and thermal flow resulting from the air-gap fans. Results showed that flow rate distributed to the air gap was increased as the stagnant flow disappeared near the air gap because of the air-gap fans. The convective heat transfer coefficient on the winding surface was enhanced by the increased velocity of the internal flow. The heat transfer coefficients at the winding surface and air gap were increased up to 31% and 90%, respectively, due to the increased flow rate. Total winding cooling performance was improved, on average, by 55% with front- and rear-side air-gap fans. For single fan performance, a rear-side air-gap fan was more effective than a front-side air-gap fan. (C) 2016 Elsevier Ltd. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S1359431116302204?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/71426
ISSN
1359-4311
DOI
10.1016/j.applthermaleng.2016.02.077
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
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