熱管應用於氣冷電動感應馬達散熱系統之研究

The Investigation on Applying Heat Pipes to The Heat Dissipation System in An Air-Cooled Electrical Induction Motor

蘇琮文(Tsung-Wen Su)

指導教授 ： 陳炳煇

國立臺灣大學/工學院/機械工程學研究所/碩士(2015年)

https://doi.org/10.6342/NTU.2015.02326

摘要

本研究探討熱管應用於氣冷系統對感應馬達之影響，包含兩個主要的實驗︰探討熱管冷卻小型加熱棒以及應用熱管於感應馬達之氣冷系統。過去關於電動車冷卻系統散熱能力與重量之間的研究較為稀少，第一個實驗中的結果指出，在相等熱量的情況下，冷卻系統的重量因為使用熱管而有所降低。另外，熱管的熱阻值隨著裝在冷凝端鰭片數目的增加而降低，有助於熱傳。此外，由於兩相流有較佳的熱傳效果，熱管比起傳統的水冷系統所需的重量較少，進一步減少車輛的總重量。第二個關於馬達散熱的實驗中，在冷的系統下將熱管的蒸發端安插於馬達的外殼中，並把鰭片安置在熱管的冷凝端來進行實驗。結果顯示在高轉速、低扭矩的工作區間中，馬達定子線圈的溫度較低並對應到馬達有較高的工作效率，代表熱管的使用有助於提昇冷卻系統的散熱能力。上述的結果表示由於較佳熱傳能力、較輕的重量以及較少的佔用空間需求，熱管是比傳統的車用水冷系統更佳的散熱元件。

關鍵字

熱管 ； 熱阻值 ； 感應馬達 ； 效率 ； 氣冷

並列摘要

This study investigated the effect of the application of heat pipes to the air cooling system on the working performance of the induction motor. There are two major experiments in this study: investigation of heat pipe cooling the heater at the small scale and the application of heat pipes to the air cooling system of the induction motor at real scale. There have been limited studies regarding heat dissipation capability and the total weight of cooling system in electric motor. The experimental results of the first study revealed that, in dissipating the same amount of wasted heat, the total weight of cooling system decreased by utilizing heat pipes as the cooling apparatus. In addition, the thermal resistance of heat pipes decreased with the increment of fins attached at the condensers of heat pipe, which is beneficial to the heat transfer. Furthermore, due to higher heat transfer coefficient of two-phase flow, heat pipes took less weight than conventional water-cool systems, which significantly decreased the weight needed in the vehicle. In the second investigation regarding heat dissipation of the induction motor, experiments were conducted by inserting the evaporators of heat pipes into the housing of an electrical induction motor and attaching fins to the condensers under air-cooling system. The results showed that the efficiency of the test motor increased and stator coil temperature decreased in the working condition of high speed and low torque, indicating the application of heat pipe facilitated heat dissipating ability of the cooling system. Such results imply that heat pipes serve as better heat dissipation apparatus than traditional water-cooling system because of better heat transfer capability, lightweight and less spaces needed in electric vehicles.

並列關鍵字

heat pipe ； thermal resistance ； induction motor ； efficiency ； air cooling

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