本文旨在研製具不斷電控制之永磁式同步電動機驅動系統，作為市電側電源中斷時之用電設備緊急驅動使用。系統之單相交流-直流功率轉換器採用全橋全控型架構，以弦式脈寬調變單極性電壓切換技術，並利用負載功率估測作功率平衡控制，將交流電源轉換為穩定的直流電源，提供電動機驅動使用。如此，市電側具有電流諧波失真率低及功率因數高之優點，且直流鏈電壓不受負載及市電側電壓變動而維持固定值。永磁式同步電動機之轉矩控制方面，採用磁場導向控制為控制依據，其轉速及電流控制迴路採用比例-積分控制器作為轉速及電流調節器。另外，永磁式同步電動機之轉子位置及速度回授則使用電磁旋轉編碼器(MR encoder)作位置及速度回授之感測，其價格便宜、安裝容易且體積小，具有商品化的價值。在市電側電源中斷期間，直流-直流功率轉換器作蓄電池組之放電控制，本文之直流-直流功率轉換器放電控制採用定電壓放電法，並配合功率平衡控制，使直流鏈電壓維持供電狀態，以提供永磁式同步電動機驅動之功率。本文系統之直流-直流功率轉換器，由全橋式直流-交流功率轉換器、高頻變壓器及半橋式二極體整流電路所組成。直流-直流功率轉換器之高頻變壓器不僅可提高電能轉換之電壓比，且具有電路隔離之作用，適合應用於本文系統之設計。
本文系統以數位信號處理器(TMS320LF2407A)作為整體系統之控制核心，其控制策略皆由軟體完成，以減少硬體電路。市電正常供應下，市電側提供單相交流110 V電源，單相交流-直流功率轉換器利用電流預測法控制直流鏈電壓為200 V，永磁式同步電動機額定轉速800 rpm，負載轉矩為6 N-m，其市電側之電流諧波失真率為6.08 %，市電側功率因數為0.99。當市電斷電時，藉由高頻切換之直流-直流功率轉換器，將蓄電池組24 V之端電壓，提昇直流鏈電壓至150 V，供同步電動機驅動使用，以達到不斷電控制之目的。本文已完成500 W不斷電控制之電動機驅動系統雛型，並由實測結果驗證本文系統之可行性。

This thesis focuses on the design and implementation of permanent-magnet synchronous motor drives with uninterruptible power supply. A full-bridge, full-controlled AC-DC power converter is designed to drive the system by basing on load power estimation and unipolar voltage switching with sinusoidal pulse-width modulation. The advantages are low current harmonic distortion and high power factor on the grid side. Besides, the dc-link voltage remains fixed when voltage of load or grid varies. Field-orientation is adopted for torque control, while proportional-integral controllers are used for speed and current regulations. In addition, the cheap and small magnetic rotary encoder is introduced for position and speed feedbacks. A DC-DC power converter is used to discharge battery set during the grid power outage by means of the fixed-voltage discharging method and power balance control to maintain constant dc-link voltage for supplying power to permanent-magnet synchronous motor. The DC-DC power converter in this thesis is composed of full-bridge DC-AC power converter, high-frequency transformer, and half-bridge diode rectifier circuit. The high-frequency transformer of DC-DC power converter can not only raise the voltage ratio of energy transferred, but also provide the function of isolation. Thus it is suitable for the proposed system.
A digital signal processor (TMS320LF2407A) is used for the core control of the system to reduce hardware components. Under normal utility power of single-phase, 110 V, and with the dc-link voltage of 200 V, the motor rated speed of 800 rpm, and the load torque of 6 N-m, the current harmonic distortion and power factor of the grid side are 6.08 %, and 0.99, respectively. On the other hand, when utility power fails, the energy stored in batteries is released to dc-link to drive synchronous motor through DC-DC power converter which switches at high frequency to achieve the function of uninterruptible power supply. A 500 W prototype of permanent-magnet synchronous motor drive with power uninterruption is developed. Experimental evaluations are given to verify the proposed system performance.

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