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研究生:廉堯閔
研究生(外文):Yao-Min Lien
論文名稱:後充磁式永磁馬達之設計與實現
論文名稱(外文):Design and Realization of Permanent Magnet Motors with Post-Assembly Magnetization
指導教授:謝旻甫
指導教授(外文):Min-Fu Hsieh
學位類別:碩士
校院名稱:國立成功大學
系所名稱:系統及船舶機電工程學系碩博士班
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2009
畢業學年度:97
語文別:中文
論文頁數:97
中文關鍵詞:馬達設計永磁無刷馬達後充磁
外文關鍵詞:post-assembly magnetization.Motor designbrushless permanent-magnet motor
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  • 被引用被引用:4
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由於永磁馬達轉子磁鐵強度,會隨著馬達尺寸與輸出功率增加而增加,導致大型永磁馬達在製作上,因磁鐵的強力磁性造成組裝上的困難,且易有鐵粉等雜物附著,使得製作成本增加,故有必要使用新的充磁技術或特殊製程解決。「後充磁法」(Post-Assembly Magnetization)為目前可有效解決上述問題的一種方法,其作法為馬達組裝完成後,再利用本身定子線圈透過外部電路或充磁機,將轉子內部的磁鐵充磁。然而,充磁電流通常在幾百甚至幾千安培以上,往往會造成線圈燒毀,且在馬達內部所產生的磁場向量,通過磁鐵邊緣時與磁鐵配向通常相異,使充磁後磁鐵邊緣無法達到飽和,而降低馬達內部磁裝載,導致馬達性能下降。因此,本論文提出二次充磁法,可使用較低之充磁電流對轉子磁鐵充磁,減少定子線圈因高電流而燒毀之機率,並且改善磁鐵邊緣難以充磁之問題。
整體而言,本論文於永磁馬達設計流程中結合二次充磁法之限制,建立一套完整後充磁式永磁馬達設計流程,並在設計過程中輔以電磁有限元素軟體進行電磁場模擬分析,再以實驗量測充磁後之磁鐵飽和度與馬達性能。最後量測結果符合理論之設計,達成後充磁式永磁馬達研發之目的。
The intensity of the magnets in permanent-magnet (PM) motors can increase as the motor size and output power increase. This causes difficulty in manufacture of large scale PM motors and consequently increases the cost. Post-assembly magnetization (PAM) can be treated as a solution to the above problem, which fabricates the motors before the magnet is magnetized by applying large current impulse on the motor stator windings. However, the impulse current required is usually in the scale of hundreds or even up to thousands of amperes and the conductor may not be able to sustain such a huge current. Moreover, due to the flux direction at the magnetization instant produced by the stator coils, the edges of magnets can bear a weaker field so that the two sides of the magnets can have a weaker magnetic intensity. This will reduce the overall air-gap flux density and affect the performance of the PM motor. Therefore, this thesis proposes a new post-assembly magnetization, i.e., two-step magnetization method to solve the above two problems. The magnetization current can thus be reduced and the edge of magnets can be fully magnetized.
Overall, this thesis designs the permanent magnet motors considering the two-step magnetization current. Finite element analysis is applied to simulate the magnetization and the motor performance. Experiments are carried out to verify the design and the proposed magnetization approach.
第一章 緒論 1
1.1 前言 1
1.2 研究動機與目的 2
1.3 本文架構 5
第二章 文獻回顧 6
2.1 前充磁法與後充磁法 6
2.2 後充磁法之參考文獻 7
第三章 後充磁式永磁馬達之分析 15
3.1 馬達槽極配 15
3.2 繞組設計與繞線因素 16
3.3 馬達三相線圈之充磁接線方式 18
3.4 後充磁法之磁場分析 21
3.4.1 馬達內部之充磁磁場分析 22
3.4.2 二次充磁方法之分析 26
3.5 充磁時轉子角度計算 29
3.6 充磁電流估算 33
3.7 磁鐵飽和度預估方式 36
第四章 後充磁式永磁馬達之設計 37
4.1 馬達設計流程 37
4.2 目標與基本條件之設計 38
4.2.1 轉子型式與負載需求 38
4.2.2 馬達主要尺寸 39
4.2.3 磁鐵種類 39
4.2.4 馬達相數、極數與槽數 40
4.3 磁路設計 43
4.3.1 磁鐵尺寸 43
4.3.2 等效磁路設計 45
4.3.3 定子尺寸之設計 47
4.3.4 充磁能量計算 49
4.4 電氣設計 50
4.4.1 繞組設計與繞組因子 50
4.4.2 激磁電流與匝數 53
4.4.3 效率檢驗 54
4.4.4 充磁電流 55
第五章 MAXWELL 有限元素模擬軟體 58
5.1 MAXWELL有限元素軟體模擬 58
5.2 模擬結果 59
5.2.1 馬達特性模擬 59
5.2.2 後充磁特性模擬 62
第六章 實驗與結果討論 65
6.1 實驗方法與步驟 65
6.2 實驗與量測結果 67
6.2.1 充磁實驗 67
6.2.2 磁鐵表磁測量 75
6.2.3 综合結果比較 78
第七章 結論與建議 80
參考文獻 82
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