相較於傳統直流有刷馬達，無刷直流馬達具有免保養、低雜訊、體積小、效率更高及壽命更長等特性，更適合應用於市售的工業產品中。本論文旨在分析及設計高效率低頓轉轉矩的無刷直流馬達。
本研究與奇力速工業有限公司合作，分析並改良設計應用於充電螺絲起子產品中的四極六槽無刷直流馬達，研究中採用田口氏實驗方法，在不改變馬達之定、轉子圓徑條件下，採用原設計之接線方式及馬達驅動器，以馬達永久磁石材料種類以及變更馬達定、轉子細部尺寸為實驗控制因子，藉由直交表設計交叉試驗，並透過ANSYS Maxwell_2D進行馬達之磁路、頓轉轉矩及加載分析。由變異數分析，決定能使馬達產生最大效率及最低頓轉轉矩的最佳化設計尺寸。根據ANSYS Maxwell_2D有限元素法分析套裝軟體對最佳化設計之新型機進行分析，數據顯示新型機與原型機相比，在效率部分由原型機的79.75%提升至新型機的85.03%；頓轉轉矩比也從原型機的11.85%降低為7.84%。
最佳化設計結果之新型機馬達，由Autocad_3D繪圖軟體繪製新馬達幾何結構並發包製作新馬達樣品。於高速馬達量測平台進行新型馬達新型機實測，以驗證本研究成果對無刷直流馬達效率之提升及頓轉轉矩之降低成效；新型機馬達應用於充電螺絲起子產品之性能實測，馬達啟動電流最大值由原型機的22.2 A降為5.2 A，啟動到穩態時間由2秒降為0.6秒；新型機馬達之離合器跳脫瞬間時，馬達的跳脫電流最大值由原型機的134 A降為111 A。

The purpose of the thesis is to establish the analysis and design on permanent magnet dc motor (PMDC) with high performances and low cogging torque. The fact that brushless dc motor (BLDC) has lower noise, smaller volume, higher efficiency, longer lifespan and maintenance-free makes it superior to conventional dc motor. The research is accomplished in cooperation with Kilews Industrial Co. based on analyzing and improving the 4-pole-6-slot BLDC used in power torque cordless electric screwdrivers so as to further enhance the performance of the product.
The analysis used in the thesis is based on Taguchi method, while maintaining the radiuses of the stator and rotor, the wiring and the driver of the motor, we cross-matched the materials of the permanent magnet, the detailed parts of the stator and rotor and analyzed the effects on the magnetic circuit, cogging torque and performed the load test via ANSYS Maxwell_2D. The ideal result with the maximum efficiency and minimum cogging torque of the BLDC was achieved using the analysis of variance method. Autocad_3D was then used to build up the newly designed model and the sample was produced. By measuring the efficiency and cogging torque the result was verified and shown that our design proves effective. Finally, the designed motor was put into a power torque cordless electric screwdriver to proceed the relative performances test. The maximum starting current was reduced greatly from 22.2 A to 5.2 A for proposed motor compared to the conventional motor. The transient period from starting to steady state was reduced from 2 second to 0.6 second, while the maximum trip current reduced also from 134 A to 111 A.

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