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研究生： 阮明發
Phat, Nguyen Minh
論文名稱： 稀土磁鐵特性分析與馬達設計應用
Characterization of Rare-earth Permanent Magnet for Electric Motor Design
指導教授： 謝旻甫
Hsieh, Min-Fu
學位類別： 碩士
Master
系所名稱： 工學院 - 系統及船舶機電工程學系
Department of Systems and Naval Mechatronic Engineering
論文出版年： 2016
畢業學年度： 104
語文別： 英文
論文頁數： 84
中文關鍵詞： 充磁 、退磁曲線 、稀土磁鐵 、表面型永磁馬達
外文關鍵詞： Magnetization, demagnetization curve, rare-earth magnet, SPM motor, ring magnet
相關次數： 點閱：60  下載：0 
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    • 本論文提出稀土磁鐵之退磁曲線計算方法，並應用於表面型永磁馬達之設計，文中首先探討充磁機與夾治具對於充磁之運用，並利用有限元素分析法先行算出磁鐵達到完全充磁所需之磁場強度。完成充磁後，利用C型鐵芯建立磁路模型量測磁鐵表面磁通密度，得到之退磁曲線可提供馬達設計時之依據。實驗將C型鐵芯建立之磁路模型所得的退磁曲線與廠商提供的退磁曲線進行比較，驗證模型的準確度與可信度。
    為了使表面型永磁馬達具有弦波反電動勢，本文亦針對環狀磁鐵進行充磁研究分析以獲得弦波反電動勢，透過模擬可證驗弦波電流的驅動可降低轉矩漣波與頓轉轉矩。

    This thesis proposes a method to reconstruct the demagnetization curve of rare earth magnet for design of surface-mounted permanent magnet motors. This thesis first discusses the impulse magnetization using a magnetizer with a fixture. The necessary magnetic field strength for full magnetization is determined by finite element analyses. After magnetization, measurements of flux density on the magnet surface are performed along with a C-core to determine the magnet model, i.e. the demagnetization curves for electric motor design. A magnetic circuit model is developed to work with the C-core measurement for modeling the magnet. The demagnetization curve obtained is then compared with that provided by the supplier to demonstrate the effectiveness of the modeling.
    Second, the magnetization pattern of ring magnet is analyzed in order to achieve sinusoidal back-electromotive force waveform for surface-mounted permanent magnet motors. The cogging torque, torque ripple can thus be reduced when the motor is driven by sinusoidal current. This is validated by simulation.

    ABSTRACT II ACKNOWLEDGEMENTS III TABLE OF CONTENTS IV LIST OF TABLES VIII LIST OF FIGURES IX GLOSSARY OF SYMBOLS AND ACRONYMS XIII CHAPTER 1: INTRODUCTION 1 1.1 Background and Problem Statements 1 1.2 Permanent Magnet Materials 2 1.3 The Hysteresis Loop 5 1.4 The Sintered NdFeB Permanent Magnet 6 1.5 Demagnetization of PM Magnets 7 1.6 The Design Problems of Electric Motor 9 1.7 The Aim of Work 9 1.8 Structure of Thesis 11 CHAPTER 2: LITERATURE REVIEW 12 CHAPTER 3: METHOD OF MEASUREMENT AND MAGNETIZATION OF PERMANENT MAGNETS 25 3.1 Magnetic Circuit 25 3.1.1 The Static Measurement 27 3.1.2 The Dynamic Measurement 29 3.1.3 The Air Gap Reluctance Modeling 31 3.1.4 The Leakage Reluctance Modeling 32 3.2 The Principle of PM Magnetization 33 3.3 Impulse Magnetizer, Magnetization Fixture 35 3.3.1 Impulse Magnetizer 35 3.3.2 The Magnetizing Fixture 39 3.4 Summary 42 CHAPTER 4: SIMULATION AND EXPERIMENT MAGNETIZATION OF BLOCK MAGNET 44 4.1 Determining the Remanence of Permanent Magnet 44 4.2 The FEA Verification of The Closed Magnetic Circuit: C-core 46 4.3 The Magnetizing Experiment 50 4.3.1 Determining Bm, Hm of Magnet 50 4.3.2 Determining Br, Hcb of Magnet 51 4.4 The Distribution of Flux Density in C-core air gap 54 4.5 Properties Comparison of NdFeB Magnet 56 4.6 Summary 57 CHAPTER 5: RING MAGNET MAGNETIZATION 59 5.1 The Magnetizing Fixture Analysis of Ring NdFeB Magnet 59 5.2 Specifications of Sintered NdFeB Ring Magnet 61 5.3 Analysis of Simulation Results 63 5.3.1 Flux Density Waveform of Magnetized Magnet in Free Space 65 5.3.2 Flux Density Waveform in Core 66 5.4 Characteristics of Ring Magnet 68 5.4.1 The Behavior between Magnetization and Demagnetization 68 5.4.2 The Characteristic of Demagnetization on the Pole Arc 69 5.5 Applying of Magnetized Magnet on SPM motor 71 5.6 Summary 77 CHAPTER 6: CONCLUSIONS AND FUTURE WORK 78 6.1 Conclusions 78 6.2 Future Works 78 REFERENCES 80

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