| Summary: | 碩士 === 國立清華大學 === 電機工程學系 === 92 === In this thesis, a digital signal processor (DSP)-based switched reluctance motor (SRM) drive is established, and its switching and speed control performance improvements are studied. First, the fundamentals about SRM drive and DSP-based control issues are understood. And accordingly an experimental DSP-based motor drive is designed and implemented. Second, in the studies concerning the reduction of acoustic noise and vibration, their sources, effects and existing mitigation approaches are first surveyed. Then five approaches are studied and applied to the established SRM drive to comparatively evaluate their effectiveness and limitations. These approaches include random frequency pulse width modulation (RFPWM), advanced turn-on and turn-off angles with fixed dwell angle, randomizing turn-off angle, current tail profiling, current tail profiling with advanced shift. The last approach is the most effective means to yield the compromised performance in acoustic noise and vibration reductions and energy conversion efficiency.
Finally, in the speed control aspect, a nominal dynamic model of the established SRM drive is first estimated. Then a two-degrees-of-freedom controller (2DOFC) and a linear model following controller (LMFC) are designed to let the motor driver possess prescribed speed control performance under varying system parameters and operating conditions. For further enhance the robustness of speed control performance, a VSS controller is designed to determine the feedback error gain in the model following control scheme. The effectiveness of the proposed VSS-adapted model following speed control scheme is verified by some simulated and experimental results.
|
|---|
