MARSによる一次抵抗同定機能付き誘導機速度センサレスベクトル制御

抄録

This paper describes a new scheme for the speed sensor-less control of the vector controlled induction motor drive.
Based on the model reference adaptive system (MRAS) theory, the rotor speed of the induction machine is estimated with a full order adaptive observer. The estimated speed is then used as the signal for the vector control and the speed control. In order to accurately estimate the speed at lower speed range, the value of the stator resistance is also identified at the same time and then is used to modify the resistance value set in the observer. The resulting system is verified to be hyperstable with Popov's criterion. As a result, this drive can operate stably in a wide range of the speed even at the zero speed. It is also shown theoretically that both speed and resistance of the rotor cannot be identified at the same time, because these two parameters are dependent on each other. Simulation results and experiments also show that the scheme is effective.