本文主要是分析單邊軸向磁通永磁同步馬達之渦流損與頓轉轉矩過大之原因,並提出改善之方法;首先,以三維有限元素分析法分析頓轉轉矩之原因,並分析幾種轉子磁石偏斜方式對頓轉轉矩及額定輸出轉矩之影響,隨後提出雙層磁石步階偏斜方法,依據內外層氣隙磁通度相同來決定內、外層磁石尺寸。 以三維有限元素分析法建立馬達定子損失模型,針對定子渦流損失進行分析並與實測結果比對,以確認損失模式之正確性,隨後提出新型定子設計來效抑制定子渦流損。 最後,以所提方法研製一只馬達單邊軸向磁通永磁同步馬達作為測試載具以驗證設計之有效性,最後分析設計與量測結果之差異做為未來研究與改善之參考。
This thesis proposes a method to improve the eddy current loss and reduces cogging torque of single side AFPM motor according to the analysis result. First, the main cause of generated cogging torque will be studied using three dimensional finite element analysis method. Furthermore, several methods of reducing cogging torque based on magnet skew will be analyzed and the influence of rated torque by skewed magnet will also be discussed. In order to reduce the cogging torque, a dual layer magnet step skew method is proposed to determine the shape of dual layer magnets. The method is based on equal generated air-gap flux density by the two different layers of magnetthe model of AFPM motor will be built based on three dimensional finite element analysis to simulate the eddy current loss of AFPM motor. Some experiments will be carried out to ensure the correctness of simulated results. Finally, a single-sided AFPM motor based on the proposed methods is built as experimental platform to verify the effectiveness of the design. Meanwhile, the differences between design and tested results will be analyzed for future research and improvement.