本文旨在研製三臂型降壓直流-直流功率轉換器，並將此轉換器用於可變直流鏈永磁式同步電動機驅動之整合控制。在永磁式同步電動機驅動系統方面，本文採用電壓空間向量脈波寬度調變，並配合永磁式同步電動機之轉子同步旋轉座標系統，藉由電流及轉子磁場角位置回授方式，完成轉速及電流閉迴路控制，以提高啟動及加載的動態性能。
本文採用三臂型降壓直流-直流功率轉換器之電壓及電流閉迴路，並且使用交錯式(interleave)脈波寬度調變，控制直流鏈電壓，使直流鏈電壓隨轉速作比例調整。當三相永磁式同步電動機在高速時採用高直流鏈電壓，低速時採用低直流鏈電壓控制。本文之可調直流鏈電壓及電流閉迴路控制可降低直流鏈電壓漣波，減少啟動及運轉之電流諧波含量，降低脈動轉矩。
本文採用以高性能數位信號處理器TMS320F2812，完成三臂型之交錯式脈波寬度調變控制及電壓與電流閉迴路控制策略、永磁式同步電動機之轉速與電流閉迴路，減少了硬體電路，縮小控制電路體積。本文已製作900W永磁式同步電動機調速系統，其轉速範圍為500 2000 rpm。當使用低電壓對應低轉速時，電流總諧波失真率由原本11%改善至4.3%。文中亦提出詳細的系統實測資料以驗證此控制之可行性。

This thesis is focused on the application of three-leg buck dc-dc power converter for the adjustable dc-link voltage. As to the drive of permanent-magnet synchronous motors, system control is conducted by voltage space vector pulse-width modulation (VSVPWM). Current and rotor-flux-orientation under synchronous frame are introduced to promote the dynamic performances of starting and load variation.
Voltage and current closed-loop control with three-leg buck dc-dc power converter is achieved. Interleaved pulse-width modulation is used to control dc-link voltage. The proportional control of the peak electromotive-force versus speed is proposed for three-phase permanent-magnet synchronous motors. Low and high speed controls are conducted by using low and high dc-link voltages, respectively. The proposed adjustable voltage of dc link and current closed-loop strategies can thus reduce voltage ripple and current harmonics.
A high performance digital signal processor, TMS320F2812, is used for interleaved pulse-width modulation, voltage and current closed-loop as well as three-leg dc-dc power converter. This reduction of hardware components results in cost lowing and reliability enhancement. A prototype of 900W permanent-magnet synchronous motor is built. The speed range of the motor is 500 2000 rpm. Experimental results indicate that the total harmonic distortion of current is reduced from 11% to 4.3% for 6.2N-m.This justifies the feasibility of the proposed system.

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