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This paper presents a speed sensorless vector control system for induction machine (IM), which is based on a flux observer. According to vector control theory of IM, the q-axis rotor flux converging on zero is utilized for speed estimation. Additionally this system solved the online identification of stator resistance by d-axis flux error.The advantages of the proposed system are simplicity and avoidance of the problems caused by only using a voltage model. The effectiveness of the proposed system has been verified by simulation and experimentation.