無槽式無刷馬達具有低頓轉轉矩、高轉速、及小體積的特性，是手持式研磨機常採用 的動力裝置。基於相同體積限制下，透過調節磁通的方式，與磁通對應之繞組結構，可達到更高的轉速。本研究提出三種調磁結構，並分析其電磁特性與磁通調節率，使得磁通得以有效利用，據以提升反電動勢，提升馬達可負載之扭矩，藉由需求扭矩與負載扭矩間差異，提升馬達研磨時之轉速。本研究之實作分兩部份進行，首先針對無槽式無刷馬達之繞組製作一繞線架，驗證所提設計之可行性；其次，採用3D列印技術進行調節磁通之結構製作，運用3D列印於結構設計高自由度的優勢，設計並製作兼具結構強度與調整磁通之原型樣品。最後量測所提改良馬達於相同扭矩下其轉速與效率的實測結果，並與原馬達做性能比較。

This thesis proposes a slotless brushless motor for a hand-held grinder, due to its advantages such as low cogging torque, high speed, and small volume.
As the speed of the motor required by the hand-held grinder is high and the volume of the motor limited by the space. This thesis proposes three methods of new motor structure design to adjust the magnetic flux, which consequently increases the motor speed due to the different between the torque of hand-held grinder required and the torque of the improve motor offer.
The design magnetic flux and analyze is using FEA software. The results show the speed increases when the structure of the motor modified.
3D printing modeling is used to add new parts to the manufactured the prototype. The experiment shows that the prototype with the new parts have enough structural strength, and it run at high speed.
The proposed design is verified by comparing with the original design. It is shown that the new structure increases the speed and the efficiency at the same torque.

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