本文旨在設計、分析及研製應用於低轉速高轉矩場合之可控直流鏈電壓的三相永磁式同步電動機驅動系統。電動機方面，採用有限元素電磁場解析套裝軟體Flux2D分析永磁式同步電動機之磁場分布、感應動電勢及電路參數，並以此訂定電動機製作規格及尺寸。本文已建立永磁式同步電動機於轉子同步旋轉座標系統之交、直軸動態模型，配合直接負載法量測交、直軸電動機參數，以完成轉子磁場導向之轉速及電流閉迴路控制。在系統整合方面，直流鏈電壓的建立係採用雙開關昇/降壓交流-直流功率轉換器，作為前級架構。本文所設計三相永磁式同步電動機之感應電動勢峰值與轉速呈線性關係，故提出轉速與直流鏈電壓整合控制，電動機於低轉速時，提供較低之直流鏈電壓；於高轉速運轉時，提供高直流鏈電壓，同時配合估測電動機負載進行功率補償控制。如此，於電動機低速運轉，電動機側電流諧波較低，且直流鏈電壓不受負載及市電側電壓變動影響，維持轉矩平穩。
本文採用數位信號處理器TMS320LF2407A為核心，三相永磁式同步電動機之轉速、電流閉迴路及系統整合控制，皆由軟體模組程式實現。本文已完成22極低轉速高轉矩之永磁式同步電動機製作，其感應電動勢峰值與轉速呈線性關係，且感應電動勢電壓諧波失真率約為2.06 %，與分析結果相接近，驗證軟體之準確性。本文已完成200 W之永磁式同步電動機驅動器，其直流鏈電壓隨電動機轉速線性調整，藉由實測結果驗證本文控制架構之可行性。

This thesis focuses on the design, analysis and implementation of dc-link voltage-controlled three-phase permanent-magnet synchronous motor drives for low-speed and high-torque applications. The characteristics such as the magnetic field distribution, electromotive-force waveform, and circuit parameters of the proposed motor are analyzed by finite element electromagnetic-field analysis software package, Flux2D. The quadrature and direct-axis dynamic models of the motor in rotor frame are derived to facilitate the speed and current closed-loop control using rotor flux orientation as well as the measurement of motor parameters. The double switch buck/boost ac-dc power converter is designed to build up the dc-link voltage. The integration of the speed and dc-link voltage control is proposed to fully utilize the linear relationship between the peak electromotive-force and speed. Specifically, lower dc-link voltage is applied at low speed, whereas higher dc-link voltage is provided at high speed. Meanwhile, motor load is estimate for power-compensation control. Thus, the motor not only has the feature of lower current harmonics at low-speed, but also maintains stable dc-link voltage and torque even under load and utility voltage variations.
In this thesis, the digital signal processor TMS320LF2407A is used for the speed and current closed-loop control as well as the system integration of the three-phase permanent-magnet synchronous motor. The implementation of the multi-pole, low-speed, and high-torque permanent-magnet synchronous motor with the linear relationship between the peak electromotive-force and speed are also given. The electromotive-force voltage harmonic distortion measured is 2.06 %, which agrees with the analytic results and thus validate the software accuracy. Moreover, the 200 W prototype of the permanent-magnet synchronous motor drive whose dc-link voltage follows the speed linearly is also verified. Experimental results justify the feasibility of the proposed system.

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