本文旨在研製高效能之直驅式無刷直流電動機驅動系統。在電源方面採用單相交流-直流功率轉換器，配合電流預測法控制，將能量供給無刷直流電動機，並改善市電側之電流諧波及提高功率因數。無刷直流電動機方面，則採用低價位之霍爾效應磁極偵測元件，以回授六步方波的磁極位置，並以磁極位置估測實際轉速，完成轉矩與速度之控制。為達到無刷直流電動機之高速運轉控制，本文提出六步方波換相之提前相角控制，具有弱磁之效果，可提高轉速至額定之2.5倍。
本文首先對系統作理論分析，然後進行硬體製作與軟體程式之撰寫。系統以德州儀器公司之數位信號處理器(DSP, TMS320F2407A)為控制核心，以減少硬體電路，降低成本。本文已完成硬體電路製作與控制軟體編寫，並於輸入110 V、60 Hz之單相電源及直流鏈電壓命令200 V之條件下，系統可輸出400 W之功率，且在此狀況下市電側之功率因數達0.98，輸入電流諧波含量為8.9 %。另外，無刷直流電動機在100 rpm正反運轉下，其輸出電磁轉矩可達20 N-m，而在高速運轉控制下最大轉速可達500 rpm，輸出電磁轉矩可達4 N-m。本文系統具有低速高轉矩及高速定功率運轉之性能，適用於無需齒輪之直驅式驅動場合。

This thesis is concerned with the design and implementation of a direct-drive system for brushless dc motors. On the grid side, a current-controlled single-phase power converter is designed to improve current harmonics and power factor, while on motor side, Hall-effect sensors are used to detect the position of rotor to estimate speed. In addition, the speed and current of motor are fed back to control speed and torque, respectively. In order to control the brushless dc motor in high speed, the phase-advancement control of six-step square waves is proposed to extend field-weakening region to 2.5 times of rated speed.
Theoretical analysis of the proposed system is given first. The implementation of hardware and software follows subsequently. A digital signal processor (DSP, TMS320F2407A) is used for the core control of the system to reduce cost and hardware components. Under input source of 110 V, 60 Hz and the dc-link voltage command of 200 V, the output of the system realized is 400 W. The associated power factor is 0.98 and the harmonic distortion of input current is 8.9 % on the grid side. Besides, the output torque under the low-speed range of -100 to 100 rpm is 20 N-m, whereas the maximum speed can reach as high as 500 rpm by high-speed control with the output torque of 4 N-m. The features of low-speed, high-torque and high-speed, constant-power operations are developed to facilitate gearless direct-drive applications.

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