運用多重品質目標模糊田口法於永磁式同步發電機之最佳設計

Optimal Design of PM Synchronous Generator Using Fuzzy-Based Taguchi Method with Multi-Targets

風力直驅式永磁同步發電機 （PMSG） 之幾何結構參數會對輸出功率與頓轉轉矩產生影響，如轉子磁石厚度、氣隙寬度、磁石展開角、定子開口槽和定子靴部深度等；因此本文提出運用多重品質特性指標 （MPCI） 之模糊推論田口法結合有限元素法分析，以求得最適合的幾何結構參數組合，使發電機能夠獲得高輸出功率與低頓轉轉矩。本論文以Ansoft Maxwell 電磁分析軟體作為發電機設計與動態性能分析平台。研究成果顯示，提議之方法能夠獲得最適合的永磁發電機幾何結構參數，以同時獲得高輸出功率及低頓轉轉矩。

In this paper, a novel systematic and efficient approach, using thefuzzy-based Taguchi method with multiple performance characteristicsindex (MPCI), is employed for obtaining the robust design of a surfacemountedpermanent-magnet synchronous generator (PMSG) for windpower with both larger electric power output and lower pulsating torqueduring starting. According to the geometric parameters of the PMSG, weselect the controllable factors and their levels, such as the permanentmagnet thickness in the rotor, the air-gap width, the opening slot width andthe slot tooth width at the stator. The proposed method first establishesthe orthogonal array (OA) that is recommended by the Taguchi method.Then the multiple targets are coordinated by the fuzzy inference mecha nism to obtain a better combination of geometric parameters to achievemultiple quality targets. The finite element method (FEM) is used as thetool for analyzing the pulsating torque and performance of the PMSG.Results have shown that the proposed method can obtain suitable geometricparameters for reducing the pulsating torque while keeping the electricpower output as large as possible in a PMSG.