以遞迴式最小平方法估計感應馬達轉子時間常數

Abstract

間接磁場導向控制(Indirect Field-Oriented Control, IFOC)技術 已經廣泛應用在高性能交流感應伺服驅動器上。此法則需要準確估測出轉 子時間常數(Rotor Time-Constant)來建立轉子磁通的角度。因轉子時間 常數易受溫度、磁飽和等因素而變動，目前常用補償技術或參數估測法來 達成理想的解耦控制。本論文提出遞迴式最小平方(Recursive Least Squares, RLS)估測法來估測轉子時間常數，此方法是由感應馬達所量測 定子電壓、電流和轉速信號，依馬達的模型線上估計實際轉子時間常數。 經由模擬的結果，驗證此估測法在變動不同操作條件下，仍能準確地估測 出轉子時間常數。 Indirect Field-Oriented Control (IFOC) technique has broadly applied in high-performance of induction motor drives. This method requires the accurate estimation of the rotor time constant which is used to calculate the angle of the rotor flux. This value widely varies with rotor temperature and flux saturation. So, recently, the technique of compensation or the parameter identification method is used to obtain the ideal decoupled control. This paper proposes Recursive Least Squares (RLS) method to estimate the rotor time constant. The method bases on the model of induction motor, measures the stator voltages and currents and the rotor speed to estimate the rotor time constant. The proposed method identifies the rotor time constant with a good accuracy at variable operation enviroment. Simulation results point out the validity of our proposed method.