臺灣博碩士論文加值系統

本論文旨在發展交流驅動器之弱磁控制技術，所研究的交流馬達為感應馬達、表面黏著式永磁同步馬達及內嵌式永磁同步馬達。在此提出一種新的電壓控制技術是應用到空間向量調變中的切換週期與有效切換時間和來作為高速區間偵測。當對於應用於脈波寬度調變之變頻器中之有效切換時間和大於切換周期時，d-軸電流命令將進行修正使得電壓軌跡由六邊形中的內切圓至六邊形而達到擴展直流鏈電壓之利用率。因此，可增加輸出功率及輸出轉矩並在弱磁操作下達成；當有效切換時間和小於切換周期時，則可使馬達在定轉矩區間運轉。
在模擬與實驗的結果說明在感應馬達之驅動上不僅可增加速度至額定轉速的4倍以上，且可操作至弱磁第二區間下工作；表面黏著式永磁同步馬達與內嵌式永磁同步馬達其轉速至少可增加至1.5倍額定轉速以上，而在有限速度驅動系統之定義下並可操作在弱磁第一區間工作。由轉矩-速度與功率-速度的特性比較可證明所提出之法則可使得交流馬達在弱磁區間下可更有效率的操作。
所提出的法則不需要額外建表及可減少對於馬達參數的靈敏度，實驗比較與模擬結果將確認所提出法則的特徵以及所提出法則的可行性。

The main theme of this dissertation is to develop field-weakening control techniques for AC Drives. It is well known that AC motors, such as induction motors (IMs), surface-mounted permanent magnet synchronous motors (SPMSMs), and interior permanent magnet synchronous motors (IPMSMs), have been investigated in this dissertation. The proposed new voltage control technique applies the switching period and active switching times of space vector modulation (SVM) for high speed region detection. As the summation of active switching times for PWM control of inverter is greater than the switching period, the d-axis current reference is modified and thereby moving the voltage trajectory from inscribed circle of hexagon to the hexagon to extend the DC-link voltage utilization. Therefore, significantly increasing the output power and torque under field-weakening operation can be achieved. As the summation of active switching times is less than the switching period, constant torque region is retained.
The simulation and experimental results have shown that the IM drives not only can increase speed over 4 times of rated speed, but also can operate at field-weakening region II. SPMSM and IPMSM drives can increase speed over 1.5 times of rated speed at least, but both types of PMSM can only operate at flux-weakening region I since the definition of finite speed drive system. And the comparison of Torque-Speed and Power-Speed characteristics shows that the proposed method can make AC motors working at more efficient operation in field-weakening region.
The presented method does not require look-up-table and reduces the parameter sensitivity. Experimental comparison and simulation results are presented to confirm these special features and the feasibility of the proposed method.

Abstract i
摘要 iii
誌謝 iv
Table of Contents v
List of Tables viii
List of Illustrations ix
Chapter 1 Introduction 1
1.1 Motivation 1
1.2 Literature Survey of Field-Weakening Control 1
1.2.1 For Induction Motor Drives 2
1.2.2 For Surface-Mounted Permanent Magnet Synchronous Motor Drives 5
1.2.3 For Interior Permanent Magnet Synchronous Motor Drives 8
1.3 Objectives and Contributions 11
1.4 Organization 11
Chapter 2 Space Vector Modulation Technique 12
2.1 Fundamental of Space Vector Modulation Technique 12
2.2 Space Vector Modulation for the Extension of DC-Link Voltage Utilization 14
2.3 Simulation and Experimental Results 17
2.4 Summary 28
Chapter 3 Field-Weakening Control of Induction Motor Drives 29
3.1 Introduction 29
3.2 Induction Motor Model and Voltage and Current Constraints 30
3.2.1 Constant Torque Region 31
3.2.2 Field-Weakening Region I 32
3.2.3 Field-Weakening Region II 33
3.3 Voltage Trajectory Control for Field-Weakening Control 34
3.4 Simulation and Experimental Results 36
3.5 Summary 50
Chapter 4 Flux-Weakening Control of Surface-Mounted Permanent Magnet Synchronous Motor Drives 51
4.1 Introduction 51
4.2 Surface-Mounted Permanent Magnet Synchronous Motor Model and Voltage and Current Constraints 52
4.2.1 Constant Torque Region 55
4.2.2 Flux-Weakening Region I 56
4.2.3 Flux-Weakening Region II 56
4.2.4 Maximum torque trajectory under Finite Speed Drive System 57
4.3 Voltage Trajectory Control for Flux-Weakening Control 57
4.4 Simulation and Experimental Results 60
4.5 Summary 71
Chapter 5 Flux-Weakening Control of Interior Permanent Magnet Synchronous Motor Drives 72
5.1 Introduction 72
5.2 Interior Permanent Magnet Synchronous Motor Model and Maximum Torque per Ampere Control 73
5.3 Voltage and Current Constraints 74
5.3.1 Constant Torque Region 75
5.3.2 Flux-Weakening Region I 76
5.3.3 Flux-Weakening Region II 77
5.4 Voltage Trajectory Control for Flux-Weakening Control 78
5.5 Simulation and Experimental Results 79
5.6 Summary 91
Chapter 6 Conclusions and Further Studies 92
6.1 Conclusions 92
6.2 Further Studies 93
References 94
Appendix A The Derivation of Fundamental of Space Vector Modulation under Hexagonal Operation 99
Appendix B The Derivation of Maximum Slip Frequency and q-axis Current Limitation under Field-Weakening Region II 102
Appendix C The Derivation of d-axis Stator Flux, d-axis and q-axis Current Limitation under Flux-Weakening Region II 105
Nomenclature 107
Vita 110
Publication List 111

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