本論文旨在從事並聯感應馬達驅動系統之建構及其均載控制。首先探究變頻器供電交流馬達可能之並聯組態與其特性，以及一些典型均載控制策略。感應馬達之額定大、結構堅實、無刷且具陡峭之轉矩-轉速特性，使其常用於大設備之並聯驅動。為得良好之均載控制效能，本論文首先綜覽感應馬達之基本特性、動態模式及驅動控制，探究其並聯均載操控原理及方法，並據以規劃所提之均載控制方法。為方便測試驗證，接著組立ㄧ由兩變頻器個別供電感應馬達之小型並聯系統驅動共同負載。採行之均載控制策略屬主-僕均流法，並應用簡易之擾動消去強健控制增進其均載操控特性。
接著，本論文研製一單開關三相升壓型切換式整流器，其電路操作、組成元件設計及控制機構之研擬等文中均仔細介紹。在直流鏈具有良好調控電壓下，亦具有良好之交流入電電力品質。先在電阻性負載下，由模擬與實測結果驗證其正確操作及性能，再將所研製之切換式整流器作為並聯感應馬達驅動系統之前端轉換器。最後以一些實測結果顯示此並聯驅動系統之總體操控比較特性，含入電電力品質、穩態與動態均載特性、動態速度響應、直流鏈電壓之變動調控特性等。
關鍵詞：感應馬達、純量控制、並聯均載控制、主-僕均流法、擾動消去強健控制、三相切換式整流器。

The major purposes of this thesis are to establish a parallel induction motor drive system and to perform its load sharing control. First, the possible parallel system configurations and their features are explored. In addition, some existing load sharing control strategies and also surveyed. Owing to the features of larger rating, rigid structure, brushless and possession of steep torque-speed characteristic, induction motors have been extensively employed for large equipments with parallel operation. For successfully performing its load sharing control, the basic characteristics, dynamic modeling and driving control of an induction motor are first comprehended. Then its load sharing control principle and methods are explored, and accordingly, the control method is proposed. For convenience of making performance evaluation test, a small parallel induction motor drive system driving a common load is established. Each motor is fed by its specific inverter. The master/slave current sharing approach is adopted for the proposed control method, and a simple disturbance cancellation based robust control is applied to enhance the load sharing control performance.
In this thesis, a single-switch three-phase switch-mode rectifier (SMR) is designed and implemented. Circuit operation, design of circuit components and control scheme of this SMR are introduced in detail. Under well-regulated DC-link voltage, the line drawn power quality is much improved. The designed SMR is first verified its effectiveness by some simulation and measured results under resistive load. Then it is employed to serve as the front-end converter of the parallel induction motor drive. Some experimental results are provided to demonstrate the whole drive comparative performance including line drawn power quality, static and dynamic load sharing characteristics, dynamic speed response, DC-link voltage regulation characteristics, etc.
Key words: Induction motor, scalar control, parallel load sharing control, master-slave method, disturbance cancellation robust control, three-phase switch-mode rectifier.

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Steel processing

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