目前風力發電機方面的相關研究，多半是以水平軸風力發電機為主，至於發電機的選用則以雙饋式感應發電機與永磁式同步發電機為主流，其中本文探討之永磁式同步發電機具有效率高、噪音低與體積小等優點，且最大特點是在轉子之激磁部分採用銣鐵硼(NdFeB)永久磁石，故不需要額外的激磁電路；但永久磁石之去磁曲線對溫度有較敏感的變化，往往因為發電機的過熱問題，導致永久磁石的性能衰退以及線圈繞組的燒毀，進而造成發電機之效率降低與使用壽命縮短，有鑑於此，如何設計出有效地散熱方式來解決發電機之溫升需求，即成為本研究之主要目標。本文首先探討發電機之發熱瓦數，其損失主要可分類為銅損、鐵損、機械損與雜散損，其中鐵損值之估算是藉由電磁場解析套裝軟體(Maxwell_2D)之磁路分析結果推算；其在無載運轉時之鐵損為24.2W，而在三相各別加載28Ω運轉時之鐵損為24W、銅損為64.45W，故總消耗瓦數為88.45W，而預估整體發電機效率為93%。
接著本研究利用計算流體力學分析軟體Fluent，針對原型永磁式同步發電機進行模擬分析，並與實驗量測之結果相互驗證；比較結果顯示模擬與實驗之差值在2.5℃內，且整體發電機之最高溫區域皆為線圈繞組，綜合其它文獻之結論，此足以證明本文建構之數值模型與模擬方法具有相當之可信度。最後針對發電機之過熱區域進行改善規劃，藉由改良發電機外殼之鰭片樣式來解決散熱問題；由模擬結果可知，徑向鰭片之散熱效益優於軸向鰭片，當發電機處於自然對流時，能使線圈繞組之溫度降到78℃。同時考量現實情況中，發電機的運轉是藉由風能驅使其運作，因此可以預期發電機會在有風的狀態下運轉，經由數值模擬計算可知；當發電機處於12米風時，在徑向鰭片上開孔之散熱模組，能使線圈繞組之溫度降到49℃，其溫度遠低於永久磁石的耐溫範圍(80℃)。總結來說，本文在發熱瓦數的估算、數值模型的建構以及模擬方法上，藉由實驗量測與數值模擬分析結果之相互驗證，其已具有相當良好之可信度，對於日後研究人員在探討發電機之散熱情況，將會有可信賴的設計工具與參考應用依據。

The researches of wind generator are giving first place to horizontal axis wind generator in the world nowadays. Then the mainly options of generators are double-fed induction generator and permanent magnet synchronous generator. The permanent magnet synchronous generator in this thesis has following advantages: high efficiency, low noise and small volume, etc. The most important characteristic is the excited part of rotor uses permanent magnet(NdFeB) so that we don’t need extra excited circuits. But magnetization curve of permanent magnet is sensitive to temperature. The problem of generator overheat cause the efficiency of permanent magnet declined and the devastation of winding so that reduce the efficiency and life of generator. So, the main purpose of this thesis is to design an effective method of thermal to overcome the elevated temperature of generator. This thesis investigates the generator power dissipation first and the lost can be classified into copper loss, core loss, mechanical losses and stray losses. The core loss is calculated by magnetization analysis result of electromagnetic field analysis software Maxwell_2D. The core loss is 24.2W in no load operation, but core loss is 24W and copper loss is 64.45W when it operates in adding 28Ω in each phase. Total power dissipation is 88.45W, so the excepted efficiency of generator is 93%. This research uses the hydromechanics analysis software Fluent. Then compare the consequence between experiment and simulation of prototype permanent magnet synchronous generator. The consequence of comparison shows that the error values are in 2.5℃ between simulation and experiment. And the highest temperature area of whole generator is winding, it is enough to prove the simulated method and model structure are reliable in this thesis. By improving the housing and fin to solve the heat problem. We can see from simulation, radial fin of the cooling efficiency then axial fins when generator in natural convection. Can reduce the temperature of winding to nearly 78℃. At last, improve the thermal of overheat area of generator. In reality, the generator is operated by wind. So, we can except the generator will operate in windy state. When the generator is in 12m wind environment, can reduce the temperature of winding to nearly 49℃ and its temperature is much lower than temperature range of permanent magnet (80℃). In the end, although the accuracy of calculated power disspation can not reach 100%, it still shows the really good reliability by consequence of comparison between experiment and simulation basically. For researchers, it can save lots of time to develop the products and be a reference for choosing fit temperature range of permanent magnet in raising temperature situation of generators and motors.

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