在許多國家裡，電助腳踏車的普遍度越來越高，相應的市場也蓬勃發展，各個國際腳踏車廠商也都致力於開發這類型腳踏車。本研究室亦是如此，相較於其他廠商的後輪鼓式馬達及異軸式中置馬達電助腳踏車，本研究室採取馬達輸出軸與腳踏軸為同軸心的方式做研究，並且結合扭力感測、車速偵測、馬達轉速…等，在之前已有設計雛形。為了讓研究成果轉變成市售產品，勢必要考慮組裝以及成本問題，所以本文將改善原有機構設計中的機構缺失，使其機構更加簡化、組裝容易，並且減少零件數量，以達到重量減輕以及成本降低的成效。

For the past few year, the air pollution and oil crisis are big issues that we shouldn’t ignore. Members in our laboratory designed a motor for electric power assisted bike system to substitute electric vehicle for original vehicle. On the basis of the brushless DC motor theory, we improve the characteristics of motor by adjusting the turns of coils and the diameter of the coils. After manufactured, the motor is tested with the simple device which is built by ourselves to check whether it fits our requests. For the mechanism which is coaxial design, we change arrangement of the parts of the motor to make it be installed more easily and be lighter. Lastly, the motor can support power enough to ride the bike on the slope. The weight of the motor is reduced by about one kilogram. The space in the motor is divided into three parts to install individually.

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