無刷直流馬達(Brushless DC Motor)具備高功率密度、高效率、維修容易等諸多優點，目前已廣泛運用於各式場合。為使無刷直流馬達有正確的電子換相，需使用位置感測元件來提供轉子資訊，例如霍爾元件即是一個低成本、高可靠度的選擇。但是在某些應用場合，例如高溫、空間小等條件限制，造成無法使用或安裝位置感測器時，就必須使用無感測器驅動技術來達成，也因此發展低成本、高效率且易實現的無感測器驅動技術也一直是業界相當重視的議題。
本論文旨在發展無刷直流馬達無感測器驅動系統，以取代霍爾元件等位置感測器。利用馬達三相端電壓經過簡單的比較器電路後即可獲得換相訊號。為補償因濾波所造成的相位落後，本論文透過「數位相位補償」以實現馬達正確電子換相。此外，在無感測器驅動之架構下，亦藉由相位超前方式實現馬達弱磁控制，延伸馬達操作區域，使得馬達轉速得以提昇。全系統無需複雜的硬體電路及繁複的數學計算，僅利用一顆16位元單晶片即可實現，具有高效能、低成本的優點。最後藉由相關實驗，以驗證本系統之效能。

Brushless DC motors (BLDCM) have been applied to many applications due to their advantages such as high power density, high efficiency and less maintenance. In order to process electrical commutations correctly, sensors are required to detect rotor pole positions. For example, Hall Effect sensors are a common-use device with advantages of low cost and high reliability. However, Hall Effect sensors may not be suitable for some conditions such as high temperature or small volume. Hence, the development of sensorless drive techniques has been a very important issue for industry.
This thesis aims to implement a BLDCM sensorless drive system to replace position sensors such as Hall Effect elements. The feature of this thesis includes simple circuitry and digital phase compensation, which compensates the phase lag due to low pass filtering for correct commutation. Moreover, under the sensorless condition, the motor field weakening can be achieved by phase advance control to extend the operating range. The entire system has been accomplished by a 16-bit microcontroller without complex mathematical calculation. Hence, it has the advantages of high efficiency and low cost. Experiments are conducted to verify the system performance.

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