本論文主旨在於發展無刷直流馬達之無感測器驅動技術，建構高性能、高可靠度與低成本之驅動系統。此外，針對現今無感測驅動技術缺點進行改良，使其操作於高轉速與滿載輸出時，皆能精準換相，有效提升馬達操作範圍及達到更高之效率。
本論文所提出之估測法，有別於傳統反電動勢估測方式，僅以馬達之基本理論與精簡之邏輯電路構成，藉由改變功率晶體切換策略，更有利於偵測未導通相之反電動勢。並根據反電動勢常數及偵測馬達轉速，進行輸出參考比較電壓演算後，取得反電動勢之交越點與換相訊號。此外本估測法不因低通濾波器相位落後影響，也不需使用相移機制，直接估測正確換相位置；故操作於高轉速時可克服相位落後之問題，亦即延伸操作範圍。另外，經由動力測試平台來驗證本論文所設計製作之無感測器驅動系統性能與效率，使其加載至馬達額定轉矩，並與有感測器驅動之性能作比較，證明此估測法之效能接近有感測器驅動。

The purpose of this research is to develop a high performance, high reliability and low cost sensorless driver technique for BLDC motors. This thesis proposes a new method which is able to improve the shortages of the present senserless driver technology and commutate correctly at high velocity and full load condition. That is, the proposed method can increase the operating range of the motor and achieve high efficiency.
The developed sensorless commutation method applies the basic motor drive theory in conjunction with logic gate circuits. The back EMF waveforms in the unexcited phase can be easily obtained by changing the switching strategy of power MOSFETs. Furthermore, the zero-crossing point of the Back EMF can be obtained based on the rotational speed of motor, the Back EMF constant and the outputs reference compares voltage. Besides, the method does not include the low pass filter and the phase shift circuit. So it is able to overcome the phase lag at high speed due to the low pass filter and estimates the commutation point directly. This thesis compares the proposed sensorless driver method with the sensor drive method by the help of the dynamics test platform to verify the performance and efficiency.

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