本文利用參考模型適應系統理論設計定子電阻估測器,經由即時調適定子電阻值以便精確的估測出定子磁通量,進而實現準確的感應馬達直接轉矩控制法則。此外,該參考模型適應系統架構,亦同時能進行轉子轉速估測,以便達成感應馬達無速度感測器之驅動控制。定子電阻與轉子轉速的估測演算法則均以Popov超穩定度定理予以證明其穩定度。 為驗證本文所提方法的效能,本文分別以Matlab/Simulink模擬軟體以及PC-based馬達即時發展系統進行模擬與實測。由結果顯示,由於定子電阻有良好的估測能力,所以馬達亦能獲得良好的轉速響應,進而實現準確的感應馬達直接轉矩控制技術。
This paper proposes a stator resistance estimator based on model reference adaptive system (MRAS) theory. With the stator resistance online identification scheme, the exact stator flux estimation is then obtained to achieve accurate direct torque control (DTC) of induction motor. Beside, the estimation of the rotor speed at the same time is completed with the MRAS for the speed control of DTC-based sensorless induction motor drives. The parallel stator resistance and rotor speed identification algorithm is developed in a systematic manner, and the proof of stability is using Popov`s hyperstability theory. To verify the effectiveness of the proposed method, the Matlab/Simulink software and the PC-based real time motor development system are used, respectively, to carry out computer simulation and experimental verification. Due to the good estimation of stator resistance, both simulation and experimental results show that good speed performance is obtained by the proposed method.