| Summary: | 碩士 === 國立臺灣科技大學 === 電機工程系 === 88 === This thesis investigates the motor terminal overvoltage,
ringing and common-mode voltage in pulse-width modulation (PWM) inverter-fed ac motor drive system where long leads are required. These phenomena may stress the motor winding insulation, and cause shaft voltage, bearing current, and conducted electromagnetic interference (EMI). Premature motor bearing failures and electronic equipment malfunctions have been reported to be directly related to bearing current and EMI. In this paper, parallel resistor, first-order and second-order shunt filter are designed to reduce the overvoltage and ringing at motor terminals, and methods to eliminate common-mode voltage using a three-level sinusoidal PWM inverter are presented. Simulation and experimental results are presented to verify the proposed filter design for 220-V PWM inverter-fed induction motor drive system with 10 meter lead lengths.
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