發明
美國
12/774,945
US 8,676,524 B2
感應機參數計算裝置SYSTEM FOR COMPUTING MACHINE PARAMETERS OF AN INDUCTION MACHINE
義守大學
2014/03/18
本技術利用感應機起動的時變電壓、電流及轉速,計算感應機等效電路的參數慣量及黏滯阻尼。時變的電壓及電流可得時變的阻抗及時變的功率。由阻抗對轉速的變化,可得感應機等效電路的參數。由電路參數及轉速可以建立動態模型並獲得輸出轉矩。由轉矩及轉速對時間的變化,可得慣量及黏滯阻尼。 本文採用最小平方法來求得參數,使得結果能盡量符合實際的行為。最小平方法的最適值搜尋以梯度法完成。梯度法為一連串的疊代過程,使設定的結果能盡量符合實際值。一組適當的初值將有助於疊代過程的收斂與疊代的效率,本文並同時提出初值的設定方法。 This technology uses time-varied signals of voltage, current and rotor speed to compute the equivalent circuit parameters, moment of inertia, and friction coefficient of an induction machine. A time-varied impedance can be found by the time-varied voltage and current. From the variation of impedance to the rotor speed, the parameters of equivalent circuit can be found. According to the equivalent circuit and rotor speed, the torque can be found via established dynamic system model. On the basis of torque and rotor speed with time, moment of inertia and friction coefficient of the motor can be obtained. This technology uses the least mean square method to solve the above parameters. The initial values of least mean square are also described in this method.
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