近年來全球環境汙染問題日益嚴重,世界各國家均積極努力降低二氧化碳排放量。歐盟政府近年不但積極修改相關法規並且進行補貼措施,以鼓勵人們使用具有綠色環保概念的電動車輛。基於歐盟國民崇尚綠能對於短行駛距離之電動輔助腳踏車接受度也越來越高,也促使電動自行車產業發展迅速。隨著電動自行車產業迅速發展中在噪音、續航力、充電速度、使用者介面遇到發展瓶頸。 本文將針對馬達共振噪音進行探討。首先以3D CAD軟體繪出整個馬達結構,使用有限元素分析軟體Ansys Workbench之模態分析模組找出馬達自然頻率,並與實驗數據進行比對,確認引發共振元件;再來針對共振元件使用實驗設計法進行最佳化設計;最後確認最佳化結果是否符合設計所需並再次檢視該設計參數是否會造成其它衍生性問題。
Recently, environmental pollution has become more serious. Countries in the world are trying to save energy and reduce carbon emissions. Many countries have started to promote the usage of green vehicles such as electric bicycles and electric cars. This paper will study about motor noise. First, the CAD software creates a motor structure, then will be imported to the finite element analysis software. Following this process, the so-called Ansys Workbench will then simulates the natural frequency model. The accuracy of the finite element model is confirmed by the experiment of modal testing. This thesis proposes a new optimal design which can improve 7% of natural frequency and can enhance the strength and endurance of the structure.