臺灣博碩士論文加值系統

本論文研究永磁同步馬達因高溫、高電流的環境下所造成的退磁故障，建立健康的馬達模型於控制器，從控制器得到的物理訊號即可作為故障診斷的依據，此法為Model-based診斷法，故模型的精確度也就代表著診斷的根基，為了提升模型精確度，本文使用ANSYS Maxwell所產生馬達等效電路萃取模型，使其表現更貼近實際馬達。
本論文的實驗系統由額定功率750W、額定電流4.9 A以及額定轉速3000 rpm的永磁同步馬達以及數位信號處理器TMS320F28335建構而成，控制法採用磁場導向控制，且會將馬達利用高溫進行退磁實驗以得到需求之故障程度，由實驗結果可知，將具有等效電路萃取模型與實際健康馬達的交軸電流進行比較，滿載時其誤差最小可達到0.20%，以驗證模型足夠精確，後續再與實際退磁馬達進行比較，依據交軸電流變化倍率即可診斷出均勻退磁故障程度。從實驗結果可知，在退磁故障程度為20%的情況下，交軸電流變化倍率為1.25倍，這也驗證了理論推導以及模擬結果。本文同時控制實際馬達與模型，以達到線上退磁故障診斷的效果。

The main theme of this thesis is to focus on the research of demagnetization fault of PMSM which is caused by high temperature and high current operation conditions. The controllers for motor drives are set up based upon normal motor without any demagnetization fault, and the controller signals are used for on-line demagnetization fault diagnosis, accordingly. This method is known as a model-based diagnosis method, and the accuracy of the model is crucial for diagnosis. To enhance the accuracy of model, the equivalent circuit extraction (ECE) motor model derived from ANSYS Maxwell is used as the model to make it approximately to the real motor.
The experimental system consists of permanent magnet synchronous motor with rated power of 750 W, rated current of 4.9 A and rated speed of 3000 rpm, and a DSP, TMS320F28335, as control platform. Field oriented control (FOC) is used for motor control. The motor demagnetization is achieved by exploring the motor in high temperature chamber. The experimental results show that the comparison of the q-axis currents derived from the ECE model and the actual healthy motor has a minimal error up to 0.20% under full load. This confirms the sufficient accuracy of ECE motor model. Then, the comparison of the q-axis currents derived from the ECE model and the actual motor is used for uniform demagnetization fault diagnosis based on the q-axis current variation ratio. The experimental results show the q-axis current variation ratio is 1.25 for 20% demagnetization fault which confirm the theoretical development and simulation results. Both actual motor and ECE based motor model are used to achieve on-line demagnetization fault diagnosis.

摘要 i
ABSTRACT ii
誌謝 iv
目錄 v
表目錄 vii
圖目錄 viii
符號彙編 xiii
1 第一章 緒論 1
1.1 研究背景與動機 1
1.2 文獻探討 2
1.3 章節概述 9
2 第二章 永磁同步馬達數學模型與其等效電路萃取模型 10
2.1 健康永磁同步馬達數學模型與其離散化 10
2.2 永磁同步馬達之等效電路萃取模型 14
3 第三章 永磁同步馬達退磁故障實現與故障診斷 19
3.1 永磁同步馬達退磁故障實現 19
3.2 永磁同步馬達退磁故障診斷 24
4 第四章 模擬與實驗結果 25
4.1 系統規格 26
4.2 模擬結果 28
4.3 實驗結果 62
5 第五章 結論與未來展望 85
5.1 結論 85
5.2 未來展望 86
參考文獻 87
附錄 89

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