| Summary: | 碩士 === 國立臺灣科技大學 === 電機工程系 === 97 === This thesis proposes the implementation of a permanent-magnet synchronous motor drive system for elevator applications. First, the configuration, characteristics and mathematical model of the permanent magnet synchronous motor are discussed. Next, an initial rotor position estimator is proposed to avoid the motor operating in an opposite rotating direction. Finally, a three-phase ac/dc converter is implemented to improve the ac input power factor and reduce the ac input harmonics. In addition, the energy can flow from the load to the ac source when the system is operated in the energy recovery.
A digital signal processor (SH-7137) is used as the control center unit. As a result, the whole control algorithm is implemented by software. The experimental results can validate the feasibility and correctness of the proposed drive system. Several measured results are obtained by using on-line measured results of the elevator system.
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