| Summary: | 碩士 === 崑山科技大學 === 電機工程研究所 === 97 === A speed sensorless system is proposed for indirect vector control of induction motor drive. The synchronous flux angle used in indirect vector control are often sensitive to the motor parameters. In this thesis, a rotor time constant online tuner and a robust to parameters variations sliding mode observer are adopted. The former tuning scheme consists of a magnetic current observer and a rotor time constant observer. The estimated rotor time constant will approach to the actual rotor time constant when the estimated current error approaches zero. The proposed flux observer is based on a sliding mode stator current observer. Rotor flux is merely integrated from the control input of the current observer when the estimated current error approaches zero. In other words, the sliding mode observer is insensitive to motor parameters variations.
Then, the aforementioned rotor time constant online tuning scheme and sliding mode rotor flux observer are combined with the sliding mode current controller proposed in [18] and apply to a speed sensorless induction motor drives. First, the proposed control scheme has simulated by MATLAB/Simulink toolbox to verify the feasibility of the proposed strategy. Finally, a PC-based experimental system is constructed to test the performances of the drive system.
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