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標題: | 大型馬達熱傳性能之研究 Heat Transfer Performance of a Large Scale Motor |
作者: | Chih-Chung Chang 張至中 |
指導教授: | 陳希立 |
關鍵字: | 大型馬達,風扇,熱交換器,定子,轉子, Large scale motor,fan,heat exchanger,stator,rotor, |
出版年 : | 2009 |
學位: | 博士 |
摘要: | 本文主要是藉由實驗以及模擬方式來探討2350 kW大型馬達的熱傳性能分析,此馬達包含有一個離心扇、兩個軸流扇、主軸、定子、轉子以及637根交錯排列型式冷卻管的熱交換器。此馬達透過熱交換器藉由氣對氣的方式散熱,其氣流路徑可以分為外流場以及內流場。外流場氣流主要是透過離心扇的轉動吸取外界大氣空氣,經由馬達基座上端的熱交換器所排出。內流場氣流主要為吸取由定子以及轉子所釋出的熱量經由兩個軸流扇、主軸以及轉子的轉動帶入熱交換器中。本研究對於風扇以及馬達的性能測試,架設實驗設備,並利用FLUENT軟體來模擬分析複雜的熱流交互作用於離心扇、軸流扇、熱交換器、轉子以及定子。實驗量測包含了風扇的性能曲線、熱交換器以及定子的溫度分佈,經由與模擬結果比對,皆有好的準確性。此外,藉由模擬結果顯示,外流場氣流經由熱交換器時,會有不均勻現象,而內流場氣流經由轉子以及軸流扇間的隙縫時,會有漏流現象產生。為了改善馬達的冷卻性能,本研究提出新的策略,包含新設計的離心扇搭配導風板、不同的熱交換器內部結構進行探討以及求取最佳化的距離於轉子以及軸流扇間,此馬達藉由整合所提出的新設計方法可以有效降低定子以及轉子的溫度高達6 oC。另外,本文最後建構出一設計準則於馬達散熱分析,可以提供馬達相關設計研究人士參考。 This thesis experimentally and numerically investigates the thermal performance of a 2350 kW completely enclosed motor, which includes a centrifugal fan, two axial fans, a shaft, a rotor, a stator and a stagger heat exchanger with 637 cooling tubes. The motor is cooled through an air to air heat exchanger. The air in the heat exchanger includes external and internal flow paths. The external air driven by the rotation of the centrifugal fan goes through the heat exchanger mounted on the top of the frame. The internal air absorbs heat released from the stator and rotor and then transfers heat to the heat exchanger through the motion of two axial fans and rotor. Several test rigs have been set up in order to measure the performance of fan and motor. Fluent software package is adopted to analyze the complicated thermal-fluid interactions among centrifugal fan, two axial fans, heat exchanger, stator and rotor. The measured data, including fan performance curves and temperature profiles of heat exchanger and stator, show good agreements with the simulated results. The numerical calculations also show that the non-uniform external flow distribution through the heat exchanger and the air leakage between axial fan and rotor reduce the cooling ability of motor. A detail discussion is also made to improve the motor cooling performance. In order to improve the cooling performance of the existing motor, proposed strategies include the new design of centrifugal fan with guide vanes, heat exchanger with different configurations, and optimal distance between axial fan and rotor. The motor integrated with the proposed design methods can decrease the temperature 6 oC in both stator and rotor. In addition, this study builds motor heat dissipation of a new design method, which provides for motor researchers. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/26103 |
全文授權: | 未授權 |
顯示於系所單位: | 機械工程學系 |
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