本文探討一個不需使用編碼器與電流偵測元件回授的轉速閉迴路風扇驅動系統，僅使用三個低解析度的霍爾效應元件作為角度回授信號，實現使用正弦波電流驅動的永磁同步電動機風扇驅動系統。

為了達到高解析度的轉軸角度估測來進行向量控制，本文使用回授低解析度霍爾信號的動態資訊，達成高解析度轉軸角度估測器，並利用多項式近似法，估測電動機的加速度參數，改善加、減速下轉軸角度的估測精度。為了不使用電流偵測元件，本文提出兩種超前角控制方法，包括反電勢法與阻抗相位法，以改善風扇驅動系統的效率，其中阻抗相位法可較反電勢法達成較佳的驅動效率。

本文使用數位信號處理器TMS320F28335作為控制核心，實現低解析度霍爾元件的轉軸角度估測法則，以及超前角控制法則。實驗結果說明本文所提出方法的正確性及可行性。

This thesis investigates a closed-loop fan drive system without using any encoder and current sensors. A sinusoidal current based PMSM drive system for fan application is implemented by using only three low-resolution Hall-effect position sensors as the position feedback signals.

To achieve a high-resolution position estimation for vector control, this paper uses dynamical information of the low-resolution Hall-effect position feedback signals to obtain the estimated rotor position. A polynomial approximation method is used to estimate the acceleration parameter and improve the estimation resolution when the motor is accelerated or decelerated. Two advanced-angle control methods, including the back-EMF method and the impedance-phase method are proposed to improve the efficiency of a current-sensorless fan drive system. The impedance-phase method provides higher efficiency than the back-EMF method.

A digital signal processor, TMS320F28335, is used to execute the rotor position estimation and the advanced-angle control algorithms. Experimental results can validate the correctness and feasibility of the proposed methods.

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