| Summary: | 碩士 === 國立臺灣大學 === 機械工程學研究所 === 107 === Nowadays, both surface permanent magnet (SPM) machine and interior permanent magnet (IPM) machine are well-developed. Elevate the power density through increasing machine speed within a specified size becomes a major goal on traction applications. In addition, the inverter size should be reduced in order to achieve this goal. In this thesis, a pulse amplitude modulation (PAM) technology is developed to reduce the inverter size. By properly designing the LC filter, the volume of DC capacitor could be substantially reduced.
In general, PAM inverter contains a front-end DC-DC converter and LC filter to regulate bus voltage. The DC converter and LC filter are co-designed to minimize the inductance and capacitor size. Besides, the six-step trapezoidal driving scheme using 30-deg and 90-deg commutation angle are compared for PAM sensorless drive. The proposed trapezoidal PAM drive also compared with conventional sinusoidal FOC and trapezoidal BLDC driving scheme on a PM motor. It is concluded that trapezoidal PAM achieves the highest efficiency under high speed and high switching frequency operation.
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