本文探討輔助式電動自行車的無轉軸角度偵測元件永磁同步電動機驅動系統的研製及其行車控制策略。文中提出的啟動方法及開關切換策略，不僅成功地執行無轉軸角度偵測元件驅動系統，亦可達到能量回收。在輔助式電動自行車的行車策略，本文利用踩踏速度控制電壓命令，並搭配騎乘者調整變速器改變自行車的齒輪比，適時提供輔助的電動助力。
本文的驅動系統使用德州儀器公司的TMS320F2808數位訊號處理器作為核心，實現控制器、角度估測器、換相點偵測器及座標轉換等。故硬體電路相當簡單，實驗結果說明本文所提方法，可有效將無轉軸角度偵測元件驅動系統應用於輔助式電動自行車。

The thesis investigates the design and implementation of a sensorless PMSM drive system for electric assistant bicycle and its control strategy. The starting method and switching strategy are proposed to achieve a sensorless drive system with energy recovery. In this thesis, a voltage command, which is generated according to the pedal speed and the gear ratio, is used to adjust the motor speed and provide the required driving force for the bicycle.
A digital signal processor, TMS320F2808, made by Texas Instrument Company, is used as the control center to execute the control algorithms, rotor position estimator, detection of the phase commutation, and coordinate transformation. As a result, the hardware is very simple. Experimental results show that the proposed method can effectively apply for the sensorless drive system of electric assistant bicycle.

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