| Summary: | 博士 === 國立臺灣科技大學 === 電機工程系 === 95 === This dissertation proposes a robust controller design and a position estimator for micro permanent magnet synchronous motor drive systems. In the dissertation, an H∞ state feedback controller is used in the speed control and the position control for a micro permanent magnet synchronous motor. In addition, the genetic algorithms are used to determine the weighting functions of the H∞ controller. An optical encoder with 100 pulses/revolution is used to achieve the rotor position of micro permanent magnet synchronous motor, which has fast response and good load disturbance rejection capability.
Next, a rotor position estimator is proposed. By detecting the back electromagnetic force (EMF), the rotor position of micro motor can be obtained. When the motor is operated in low speed range, the stator current is discontinuous, and then the back emf can be detected directly while the stator current is zero. On the other hand, when the motor is operated in middle to high speed range, the stator current is continuous. The back emf can be computed. Finally, the rotor position can thus be obtained.
The digital signal processor TMS320LF2407 is used as the control center to execute the estimation and control algorithms. Experimental results validate the theoretical analysis to show the correctness and feasibility of this dissertation.
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