| Summary: | 碩士 === 中原大學 === 電機工程研究所 === 93 === This thesis presents a current-mode concept and a design method for sensorless induction motors to achieve speed tracking. First, the traditional ideal current loop is replaced by the assumption of allowing a bounded stator voltage and a finite absolute-integral of current tracking error. From this practical current-mode model for the induction motors is used for the controller design. Our objective is to develop a fuzzy observer-based, controller for speed tracking. Second, the fuzzy observer is addressed to estimate the immeasurable states of rotor flux
and rotor electric angular speed, whereby zero estimation error is concluded. Third, the controller is proposed by using the design concept of virtual desired variables. In light of this concept, the concept of vector control is presented. The vector control and the fuzzy observer are independently designed. According to the derived stability criterion, the observer gains and control gains are obtained by solving
linear matrix inequalities. Finally practical simulations and experiments are found to be consistent with theoretical derivations.
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