本文旨在設計及製作高轉速場合應用之無槽式永磁無刷直流電動機，如高速離心機等產品；並發展出無槽式永磁無刷直流電動機設計之最佳化流程。文中提出ㄧ種創新無槽式電機模鑄線圈的製作流程，可改善傳統無槽式電機製程；採用電子絕緣散熱材料鑄型，可有效排出因導體所產生的熱量，故溫昇相當的低，且因電機的無齒槽，消除了由齒槽效應所產生的頓轉轉矩，於高速運轉時，噪聲及振動都相當的低。
本文無槽式永磁無刷直流電動機為4 極12線圈繞組之結構，線圈繞組並採用分佈繞全節距之繞線方式，使各線圈繞組為各差 電機角，此如線圈繞組配置磁通利用率為最好，且能抑制總諧波失真率的產生。本文先藉由理論公式分析推導取得最佳化之無槽式電機尺寸，再配合有限元素磁路分析套裝軟體Ansoft Maxwell_2D進行電機之磁路、頓轉轉矩及感應電動勢之分析，以完成無槽式電機幾何尺寸、線圈繞組、鐵心及磁石等材質的最佳化設計。
本文已完成三相無槽式電機模鑄線圈，其在轉速為13,500 rpm，頻率為450 Hz運轉情況之下，分析其額定轉矩為0.21 N-m，頓轉轉矩為2×10-8 N-m，其比值為9.52×10-6 ％ ，故可驗證此頓轉轉矩相當低；感應電動勢相電壓峰值為12.1 V，相電壓總諧波失真率為4.58 %。本文無槽式電機安裝及校正完成霍爾感測元件電路，並量得無槽式電機之直軸電感為47.14 μH 、交軸電感為48.12 μH，每相定子繞組電阻為0.2368Ω及轉子等效平均磁通鏈為4.23 V-s/rad。

This thesis is concerned with the analysis, optimum design and production of slotless DC brushless permanent-magnet motors for high-speed applications such as centrifuge. The reason of proposing the kind of innovation with slotless motor molded coil production manufacturing is to improve the traditional slotless motor manufacturing. Temperature could be much lower by using electronic thermal insulating material mold, which can effectively discharge the heat generated by coil. Due to the fact that the motor is slotless, cogging torque induced by slot effect is reduced, thereby results in low noise and vibration in high-speed operation.
A 4-poles, 12 coil windings is proposed for the slotless motor. Full-pitch distributed winding is adopted to yield a difference of 180 electrical degrees between any two of three-phase windings. This will result in the best utilization rate of the magnetic flux generated by the coils. The total harmonic distortion of the induced phase voltage will also be reduced accordingly. Theoretical derivations are first given to obtain optimum parameters such as air-gap flux density, rated voltage and current, etc. Analysis by finite element electromagnetic-field analysis software package, Ansoft/Maxwell_2D, is conducted to justify the characteristics obtained through the derivations mentioned above. Finally, the material of the permanent-magnet, number of coil winding as well as the geometric dimensions of the slotless motor are determined.
A slotless motor molded coils winding is built. Experimental results show that the operating speed is 13,500 rpm and the frequency is 450 Hz, the rated torque is 0.21 N-m, and the cogging torque is 2×10-8 N-m, the ratio is 9.52×10-6 ％, which shows the cogging torque is very low. The induced voltage and harmonic distortion measured are 12.1 V and 4.58 %, respectively. Furthermore, this slotless motor installation and calibration is completed with Hall sensor circuit. Direction-axis and quadrature-axis inductances measured are 47.14 μHand 48.12 μH, correspondingly, with the winding resistance Rs of 0.2368Ω and flux linkage of 4.229V-s/rad.

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