隨著環保意識與節約能源的議題逐漸受到重視，電動載具零排放、低污染與高效率的特性亦成為各界發展重點之ㄧ。本論文以小輕型電動載具之驅動系統為研究主軸，設計與實現一低成本、體積小，且具有電子式變速與煞車回充功能之驅動器。
首先，本論文針對三相永磁無刷馬達之特性進行分析與討論。其次，依據小輕型電動載具規格，設計一組具有高啟動轉矩與高極速範圍的永磁無刷馬達之電子式兩段變速器，以期改善傳統機械式變速器之效率低、體積大等問題，並透過轉矩控制消除變速過程中轉矩輸出不連續現象，提升電子變速器之可靠度與舒適度。最後，本論文設計一煞車回充系統，利用超級電容高功率密度的特性，適時地回收車輛於煞車期間的動能，且為了減少超級電容的使用體積與成本，本論文提出新型態的回充電能管理系統以妥善利用回充之電能，進而增加電動載具之續航力。由理論分析與實驗結果，可驗證本論文所提之電子式變速與能量回生技術具有創新性整合與實現性。

As environmental consciousness and energy saving concerns continue to grow, the development of electric vehicles has become a major focus for industry. The electric vehicle is advantageous in its unique features such as no exhaust, minimal pollution and high efficiency, which particularly address the increasing need and awareness for environmental protection. This thesis presents the design and implementation of a compact drive system applied in Light Electric Vehicles (LEVs), which features an electric transmission and regenerative braking.

First, the characteristics of permanent magnet brushless motors were analyzed and discussed. Second, a novel electric two-speed transmission, which has high starting torque and high-maximum speed, was designed in order to compensate for the disadvantages of traditional mechanical transmissions, such as low efficiency and large volume. Moreover, a closed-loop torque control scheme is proposed to eliminate the unwanted jerks during gearshift transient, increasing the reliability and stability of electric transmissions.

Finally, a regenerative braking system using the kinetic energy retrieved by the high-power-density ultracapacitor during braking was designed in this thesis. In addition, a novel regenerative electric energy management system was proposed to reduce the cost and holding volume of the ultracapacitor, thereby improving the range of the electric scooter. Theoretical analyses and experiments were conducted to evaluate the effectiveness of the presented technique.

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