本論文旨在探討無轉軸偵測元件單相風扇驅動系統及其積體電路晶片的研製，並提出兩種不同的驅動方式。文中，首先分析單相風扇電動機之結構、原理及數學模式。然後探討驅動方法，採用數位訊號處理器晶片TMS320LF2407A作為控制器，以簡化驅動系統的硬體電路，並提出兩種控制方法。方法一，利用外部的類比/數位轉換器來讀取電壓訊號，判斷反電動勢零交越點，作為換相的依據，估測電動機轉速，完成閉迴路控速系統。方法二，探討變化輸入電壓並調整輸入頻率以便控制轉速。本文針對靜止重新啟動以及初始位置不正確，導致電動機不正常反轉的問題，提出因應策略並加以改善。
為了縮小驅動系統的體積，本文利用Altera公司生產的CycloneⅡ EP2C20F484C8場效可程式邏輯閘陣列晶片，取代數位訊號處理器。最後，進一步以ASIC技術，整合類比與數位電路設計，完成一個積體電路，達成所需的驅動及控制。模擬與實測證明本文所提方法的可行性及正確性。

This thesis proposes the implementation of a sensorless single-phase fan- motor drive system and its relative integrated circuit design. Two different drive methods are proposed here. First, the structure, principle, and mathematical model of the single-phase fan-motor are introduced. Next, the implemented drive system is discussed. A digital signal processor, TMS320LF2407A, is used as the control center to reduce the complexity of the hardware circuit. In the proposed method 1, an external A/D converter is used to convert the analog signal into digital signal, and then to determine the zero crossing of the back emf. The zero crossing can be used to determine the phase-commutation time and the rotor speed, and then achieve a closed-loop control system. Next, in the proposed method 2, the variable voltage and frequency method, is proposed to control the speed of the motor. Some strategies are used to slove the restarting problem and the initial position problem.
After that, a field programmable gate array, CycloneⅡ EP2C20F484C8, made by Altera company, is used to replace the digital signal processor. Finally, an integrated circuit is developed by combining the analog circuits and digital circuits.The integrated circuit uses the application specific integrated circuit (ASIC) technique. Finally, some simulated results and experimental results are provided to validate the feasibility and correctness of the proposed methods

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