本論文提出一種用於衛星姿態控制反應輪之無鐵芯定子永磁同步馬達，並結合創新同極式磁浮軸承設計。反應輪馬達需要輕量化、低運轉損耗、高效率及高慣量之設計，以利衛星之發射以及穩定運轉。無鐵芯定子設計具有鐵芯損耗低、重量輕等優點，因此適合應用於反應輪。然而無鐵芯定子設計會因轉子旋轉而作用於定子線圈之交變磁場，使導體中產生顯著之渦流損耗，如此不利於損耗之降低。本論文綜合分析各種設計因素，結合衛星運轉特性，盡可能地減少反應輪之功率損耗，以設計一種輕量化、低損耗之反應輪馬達，並藉由有限元素分析模擬加以驗證。本論文接著考量反應輪之壽命限制，提出一創新型之同極式磁浮軸承應用在反應輪上，藉由提高反應輪之轉速降低飛輪之慣量需求，並改善滾珠軸承之缺點。本論文提出之創新磁浮軸承，其架構使每一個單元之磁浮軸承同時擁有徑向力以及軸向力，且藉由對稱式之結構設計，使得磁浮軸承之控制邏輯相當簡單，也可以獨立控制徑向力或軸向力。此外，本論文亦推導磁浮軸承之磁路模型，並同樣藉由有限元素分析模擬進行比較。配合原有之定子無鐵芯馬達設計，使採用磁浮軸承之反應輪可以達到高可靠度、高轉速且低功率損耗之目的。最後進行兩款反應輪原型機實測，以分別驗證馬達及磁浮軸承設計之可行性。

This dissertation presents the design of a coreless stator permanent magnet synchronous motor (PMSM) for satellite attitude control using reaction wheels. Reaction wheel motors require lightweight designs that exhibit low operational losses, high efficiency, and significant inertia to minimize power consumption while maintaining satellite stability. The coreless stator design offers the advantages of low iron core losses and reduced mass, making it suitable for application in reaction wheels. However, for the stator, this design might lead to significant eddy current losses in the conductors due to the alternating magnetic field of the rotor magnet, hindering loss reduction. Therefore, this dissertation comprehensively analyzes various design factors, aligning them with satellite operational scenarios, to minimize power losses in reaction wheels. A lightweight and low-loss reaction wheel motor is designed and simulated using finite element analysis. Additionally, to address the limitations of ball bearings and improve the rotational speed of the reaction wheel, this dissertation proposes an innovative homopolar magnetic bearing for reaction wheels. The introduced magnetic bearing employs a novel structure, enabling each unit to exert both radial and axial forces. Through symmetric design, the control logic for the magnetic bearing is simplified, allowing for independent control of radial and axial forces. Furthermore, the magnetic circuit model of the magnetic bearing is derived and compared with finite element analysis simulations. Integrated with the coreless stator motor design, the incorporation of the magnetic bearing enables the reaction wheel to achieve high reliability, high speed, and low power loss. Finally, both types of reaction wheels are manufactured to experimentally validate the feasibility of the motor and magnetic bearing designs.

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