本論文針對無刷直流馬達提出ㄧ無感測器驅動技術。現今已有許多研究提出估測無刷直流馬達轉子位置之方式，然而並未論及馬達負載於額定轉矩之狀況，亦未明確探討其轉速操作範圍。一般無感測器驅動技術由於無法在大操作範圍皆能達成精準換相，因此效率不佳且轉速範圍受限。本論文提出一改良估測方法，以解決上述換相估測不準確之問題，在馬達於額定轉矩輸出模式下，突破一般估測法之限制，達到更高之效率與更廣之馬達操作範圍。
本論文所所提出換相估測法乃是基於馬達端電壓之比較，結合高通濾波器濾與低通濾波器，根據馬達轉速切換其濾波器截止頻率，不只濾除影響換相之雜訊之外，在大轉速範圍操作下，可避免估測訊號不準確之問題。經實驗驗證，藉由本論文所提出之估測方法，可有效提升馬達於額定轉矩輸出下之效率，較之於一般無感測驅動高出甚多，且接近有感測驅動之效率，此外亦具備較一般無感測技術更大之操作範圍。

This thesis proposes a sensorless drive technique for brushless DC (BLDC) motors. There have been many sensorless techniques proposed for BLDC motors in recently years. However, the motor performance under rated load condition and the operating speed range have not been discussed. Common sensorless techniques cannot perform accurate commutation under a wide operating range, which results in low efficiency and limited speed range. Therefore, this thesis proposes a method that can overcome the problem of the inaccurate commutation. This technique allows the efficiency to be improved under rated torque, and a wide operation range can be accomplished.
The proposed technique is based on the comparison of motor terminal voltages and combines high- and low-pass filters. By regulating their cut-off frequencies according to the motor speed, not only the noises can be rejected but also the commutation can be more accurate for a wide speed range. The experimental studies show that the proposed technique has a superior performance to common approaches. Under rated load condition, the proposed method can drive the motors with close efficiencies to the case equipped with Hall effect sensors. Moreover, the speed range is wider compared to common senslorless methods.

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