| Summary: | 碩士 === 國立交通大學 === 電機與控制工程系所 === 96 === In this thesis, a novel fuzzy/lead-lag switching control design is developed for the permanent magnetic (PM) DC brushless motor to improve its velocity response performance in both the bandwidth and stability. In the current feedback loop, the noise due to the Hall sensor, PWM switching, and environments has been practically reduced by applying the proposed medium filter and its velocity performance is significantly improved. Furthermore, to improve performance and stability of the velocity loop, both operations in linear and nonlinear ranges are concerned. In the linear operation region, the lead-lag compensator has been designed to effectively increase the bandwidth. On the other hand, the fuzzy controller has been designed to be more efficient in the nonlinear range due to the saturated current, the larger operation range, or significant load variation. Finally, the auto-switching fuzzy/lead-lag controller is designed by integrating two controllers to properly operate in various regions with a proper switching rule. The present controller is implemented on the TI TMS320 F2812 DSP and experimental results indicate that the proposed controller significantly improves both system bandwidth and response performance in the overshoot and steady-state oscillation under various conditions.
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