本文旨在設計及製作應用於高轉速場合之無刷直流電動機驅動系統，提供大範圍之轉速調控。文中提出脈波振幅調變與脈波寬度調變混合控制策略，使無刷直流電動機驅動器之輸入直流鏈電壓，在高轉速運轉時，隨轉速命令調變。文中含有隔離型直流-直流功率轉換器，其主要目的為將140V至200V之高壓側直流鏈電壓轉換為24V至48V低壓側可調式直流鏈電壓，無刷直流電動機驅動採用三個霍爾效應偵測元件作轉子磁場角位置及轉速回授用，並完成六步方波的控制及轉速閉迴路控制。

本文以數位信號處理器dsPIC30F4011為控制核心完成實體製作。系統之直流-直流功率轉換器控制策略、無刷直流電動機驅動器控制策略及脈波振幅調變與脈波寬度調變混合控制策略皆由C語言撰寫程式完成。最後，完成輸出容量為80W與最大轉速誤差率1.5%之 至 高轉速大範圍之無刷直流電動機驅控系統。

This thesis is concerned with the development of the control system for brushless dc (BLDC) motor in high speed applications. A control policy which combines pulse-amplitude modulation with pulse-width modulation is proposed to control the input voltage according to the speed command for BLDC motor drives. A dc-dc power converter is designed to change the voltage from 140~200 to 24~48 volt. The BLDC motor drives use three hall-effect sensors to detect rotor position and calculate motor speed for six-step square-wave and closed-loop control of speed.

In this thesis, the digital signal processor, dsPIC30F4011, is adopted as the control core. C-language is used for dc-dc power converter control, BLDC motor drives control and realization of control policy which combines pulse-amplitude modulation with pulse-width modulation. A prototype of 80W is built and accuracy of speed command is below 1.5% for high speed control drives from 1 k to 20 k rpm speed. The experimental results verify the proposed performance.

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