[[alternative]]Implementation of Sensorless Driver for the Permanent Magnet Synchronous Motor

碩士電機工程學系[[abstract]]永磁同步馬達有高效率及高轉矩的特性，故廣泛應用於家電電器，但此類馬達內部之霍爾元件易受溫度影響導致故障而提高維修成本，故許多研究再探討無感測技術，無需霍爾元件，希望能降低維修成本及減小馬達體積。無感測驅動技術最常利用的是反電動勢檢測法，此檢測法缺點在於低轉速時不易檢測。而本文以偵測馬達三相端電壓訊號替代霍爾訊號，直接針對端電壓進行濾波，再將三相訊號兩兩相減取得檢測訊號。本研究之無感測驅動架構核心為數位訊號處理器，週邊硬體包含保護驅動電路、換流器電路、轉速顯示電路及轉子位置偵測電路。 實驗中以不同轉速範圍與加載時進行檢測，檢測結果的波形都能與霍爾感測器的輸出波形同相，證明本研究方法能替代霍爾感測器達到無感測器驅動。 關鍵字：永磁同步馬達、無感測驅動、反電動勢[[abstract]]The permanent magnet synchronous motor features with high efficiency and high torque characteristic, so it is widely used in home appliances. Hall sensor, an important device inside the motor, is easily affected by high temperature and becomes failure. Therefore, sensorless technology is motivated to solve this problem. The most used method of sensorless technology is back-EMF detection method. Its disadvantage is that it is difficult to detect the back-EMF signal in low rotation speed. The sensorless driving system for the permanent magnet synchronous motors is built on a DSP as its core and contains protection circuit, the inverter circuit, the rotational speed display circuit and the rotor position detection circuit. We test the proposed rotor position detection circuit in various rotational speed of the motor with load. The test result shows that the detected waveforms are almost in phase with the Hall sensor output waveforms. That prove the proposed method is feasible for sensorless driving system. Keywords: permanent magnet synchronous motors, sensorless driver, back-EM