| Summary: | 碩士 === 國立臺灣科技大學 === 電機工程系 === 99 === This thesis is composed of two parts. One is concerned with the design of permanent-magnet synchronous motor (PMSM), where Maxwell 2D produced by Ansoft company is used to obtain the optimum design with cost reduction as well as the assurance of motor performance. The other is the design of ac-dc-ac power converter which uses three-phase full-controlled full-bridge type power factor corrector in place of traditional diode rectifiers to drive the designed PMSM. The proposed control strategy not only reduces harmonic current and improves power factor in the power supply, but also keeps dc-bus voltage stable under load variation. The PMSM control can rotate in both directions. The proposed variable-frequency power inverter can reduce power dissipation and provide elevator-like performance. In addition, the inverter can also reduce harmonic current and torque pulsation for PMSM in the fully adjustable speed range.
The 32-bit digital signal processor, TMS320F28335, is adopted to implement the control functions of the system. The control of the closed-loop rectifier voltage and current as well as the inverter control of motor speed and current are realized by software to reduce circuit components, and thereby improving reliability. An experimental system is built with input voltage of three-phase 220V, 60 Hz, dc-bus voltage of 340V, and PMSM as output. Experimental results show that under 1300 rpm, 11.3N-m load condition, the total harmonic distortion of current is 5.88% on the supply side, while the total harmonic distortion of current is 3.48% on the load terminal.
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