臺灣博碩士論文加值系統

本篇論文研究具有Y接繞組的永磁馬達開路故障即時偵測，提出使用繞組中性點電壓檢測故障來改善故障監控之性能。常見的開路故障檢測方式皆使用驅動器現有之電流感測器計算dq電流產生之諧波。由於電流大小正比於馬達轉速和負載條件，因此在輕負載或低速狀態下發生故障對於dq電流檢測能力仍然是需要克服的問題。本論文比較中性點電壓與dq電流兩種偵測方法，分別分析當開路故障時，所產生之額外諧波來找到故障訊號進行故障檢測。中性點檢測方法需加入額外之電壓感測器來量測馬達中性點電壓，由於中性點電壓對於負載變化的反應較不敏感，因此可以獲得更佳的故障檢測性能。本論文亦利用馬達中性點，提出單相容錯驅動控制策略，在馬達故障後可以切換至單相驅動，讓馬達能夠在錯誤中穩定的運轉。實驗測試是使用50-W永磁馬達馬達來驗證提出的開路故障檢測與容錯控制方法。

This paper proposes an on-line stator open-phase fault detection and tolerant control for permanent magnet (PM) machines with Y-connected windings. The stator neutral point (NP) voltage is connected to detect the phase faults as well as improve the fault detection performance. Conventional phase fault detection relies on the estimation of d-q axis current harmonics using drive available phase current sensors. Phase fault at light load is still a challenge since the magnitude of current harmonic is proportional to the machine load. Under this effect, fault induced current harmonics are too small to estimate at light load.
In this paper, both fault harmonics in dq currents and NP voltage are analyzed to comparatively evaluate the detection performance. Although NP voltage detection method requires an additional voltage sensor in PM machines, the NP voltage is less sensitive to load, reaching a better fault detection performance. In addition, a fault tolerant control by using the single-phase drive topology is proposed. The machine can be stably operate during the presence of phase fault. A 50-W permanent magnet machine is tested to verify the proposed open-phase fault detection and tolerant control methods.

致謝 i
中文摘要 ii
ABSTRACT iii
目錄 iv
圖目錄 vi
表目錄 viii
符號彙編 ix
Chapter 1 緒論 1
1.1 研究背景 1
1.2 文獻回顧 2
1.3 研究目的 11
1.4 論文大綱 12
Chapter 2 開路故障檢測 13
2.1 d-q電流故障諧波 13
2.2 中性點電壓故障諧波 18
Chapter 3 監控方法實現問題 29
3.1 感測器誤差 29
3.2 阻抗與電壓降 33
3.3 類比-數位轉換器取樣解析度 34
Chapter 4 故障後容錯控制 35
4.1 容錯控制系統 35
4.2 單相驅動容錯控制 38
4.3 ELSC容錯控制 41
Chapter 5 實驗結果 43
5.1 永磁馬達故障諧波 44
5.2 故障訊號響應 48
5.3 馬達在輕負載和低速開路故障檢測 50
5.4 暫態速度故障檢測 52
5.5 感測器偏移故障檢測 54
5.6 故障後容錯控制 56
Chapter 6 結論與未來研究方向 59
6.1 結論 59
6.1.1 開路故障檢測 59
6.1.2 監控方法實現問題 60
6.1.3 故障後容錯控制 60
6.2 未來研究方向 62
參考文獻 63

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