感應馬達因穩態後具有二次銅損，導致效率較永磁同步馬達差。而永磁同步馬達則需要驅動器與感測器，才能得知轉子位置資訊，來激磁起動與控制，成本較感應馬達高。因此有研究提出了單氣隙自起動馬達的架構，將感應馬達及永磁同步馬達的優點結合，實現可如感應馬達感應起動，亦可與永磁同步馬達一樣可達同步運轉的馬達。但目前市售之自起動馬達，因起動時受到永久磁鐵之煞車轉矩影響，導致起動效能不佳。因此本文提出一新型之雙定子式自起動馬達，藉由雙氣隙馬達之雙定子式架構，由兩組定子繞組結構提供磁場，一組用以起動，另一組提供穩態後之旋轉磁場，此設計能達到提高起動負載能力且能同步運轉之目的。
　　本研究以轉矩方程式探討為基礎，探討各項參數對於雙定子式自起動馬達設計之影響。且藉由有限元素分析軟體ANSYS模擬，分析設計可行性及最佳化設計，並實作一原型機進行量測以驗證設計。最後原型機量測結果可自起動並達穩態轉速，且具有高效率以及高起動負載能力。

It is well known that the induction motors (IMs) efficiency is usually lower than the perma-nent magnet synchronous motors (PMSMs) because of the rotor copper loss. However, the PMSMs require position sensors, such as hall sensors or resolvers, to excite the right wind-ings thus driving its production cost high. To resolve the problems of the above two type of motors, researchers developed a line-start permanent magnet synchronous motors (LSPMSMs). This type of motor combines the advantages of IMs and PMSMs. LSPMSMs are able to start with induction torque, and then reach synchronous speed without slip as PMSMs will do. But unfortunately, due to breaking torque caused by permanent magnets, the starting ability of LSPMSM is poor.
In this thesis, a new dual stator line-start permanent magnet synchronous motors (DSL-SPMSMs) is proposed. With the double stator structure, the magnetic field is provided by two sets of stator windings: one set is used to start and the other provides the rotating mag-netic field after steady state. This design not only achieved the purpose of increasing the starting load ability but also reached synchronous speed without position sensors. The torque equation is discussed to realize the influence of each parameter on the design of the DALSPMSMs. A feasibility study of the proposed design is conducted using finite element analysis (FEA) software. Finally, a prototype is fabricated and experiment conducted to ver-ify the results of the FEA.

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