The synchronous DQ-frame observer and the speed adaptation for algorithm for indirect vector control of sensorless induction motor

센서없는 유도전동기의 간접 벡터제어를 위한 동기 좌표계 관측기 및 속도적응 알고리즘

In this study, the full-state flux observer is designed in the synchronous DQ-frame and the speed adaptation rule is derived by using the MRAS(Model Reference Adaptive System) theory. In this rule, the induction motor becomes a reference model and the flux observer is taken as a adjustable model. A guideline of the adaptation gain is investigated for the precise and stable speed adaptation and the proposed scheme is compared with the conventional one designed in the stationary DQ-frame.