內藏式永磁同步電動機的轉軸角度估測方法

Abstract

本發明提出一種轉軸角度估測方法，適用於內藏式永磁同步電動機中估測一轉軸角度。所述估測方法包括：在三相四開關變頻器架構下，讀取定子的第一相電流與第二相電流；根據所述第一相電流與所述第二相電流，計算三相電流變化率；以及利用所述三相電流變化率的差值來進行矩陣運算，據以估測所述轉軸角度。此方法成功地將六個功率開關減少為四個功率開關，可實現轉軸角度的估測，而轉軸角度經差分運算可得轉軸速度。本發明可適用於電動機在中轉速或低轉速運轉下估測轉軸角度。 A rotor position estimation method is provided which is suitable for estimating a rotor position of an interior permanent magnet synchronous motor. The estimation method includes: reading a first phase current and a second phase current of a stator under a four-switch three-phase inverter; calculating a three-phase current variation rate according to the first phase current and the second phase current; and using deviations of the three-phase current variations to process a matrix calculation, so as to estimate the rotor position. The method has successfully reduced six-switch to four-switch for estimating rotor position and even for rotor speed, which is obtained from rotor position with difference operating. The present invention is suitable for medium speed operation or low speed operation of the motor to estimate the rotor position.