多相電機(jī)的定子故障容錯運(yùn)行分析

電氣工程論文編號:DQ187   論文字?jǐn)?shù):13859,頁數(shù):45

目錄
摘  要 II
目錄 IV
1 前 言 1
2  多相異步電機(jī)發(fā)展概況 3
2.1 概述 3
2.2 多相異步電機(jī)的發(fā)展歷史 5
2.3 多相異步電機(jī)的控制系統(tǒng) 7
2.4 多相異步電機(jī)的容錯運(yùn)行 7
3  多相異步電機(jī)的原理及特點 8
 3.1 結(jié)構(gòu)及原理 8
3.2 特點 9
4 基于Maxwell的建模和正常運(yùn)行仿真 10
4.1 Maxwell建模 10
4.1.1 創(chuàng)建新工程 10
4.1.2 選擇求解問題的類型 12
4.1.3 創(chuàng)建模型 13
4.1.4 設(shè)定模型材料 13
4.1.5 設(shè)定邊界和激勵源 14
4.1.6 設(shè)定求解參數(shù) 14
4.1.7 設(shè)定求解選項 16
4.1.8 求解 18
4.2 正常運(yùn)行仿真 22
5 五相異步電機(jī)斷相后的控制及Maxwell仿真 22
5.1 概述 22
5.2 五相異步電機(jī)一相斷相后的仿真 22
5.3五相異步電機(jī)斷相后的分析 27
5.3.1有中性線連接時的斷相分析 27
5.3.2 無中心線連接時的斷相分析 30
5.4 Maxwell仿真結(jié)果 35
5.5 總結(jié) 36
6 結(jié)束語 37
致謝 38

摘  要
 本文主要基于Maxwell研究五相異步電機(jī)的特殊性能及其控制策略。
 五相異步電機(jī)是在三相異步電機(jī)的基礎(chǔ)上，通過相數(shù)的擴(kuò)展而形成的。由此而引申開來的多相異步電機(jī)具有許多比三相異步電機(jī)更加優(yōu)越的性能。它特別適合于大功率的變頻調(diào)速系統(tǒng)或高穩(wěn)定性系統(tǒng)，具有良好的發(fā)展前景。
 當(dāng)五相異步電機(jī)中有一相主動退出運(yùn)行或因故被動斷開時，可以在不改變硬件結(jié)構(gòu)的基礎(chǔ)上，通過對其余各相的電流矢量進(jìn)行調(diào)制，使得電機(jī)能夠維持圓形的旋轉(zhuǎn)磁場。而五相異步電機(jī)只需降載運(yùn)行或在提高其余各相電流幅值的基礎(chǔ)上作滿載運(yùn)行。這些特性是三相異步電機(jī)所無法比擬的。
 與三相異步電機(jī)相比較而言，多相異步電機(jī)的主要優(yōu)點有：①轉(zhuǎn)矩脈動次數(shù)升高（即脈動頻率增加），幅值下降；②轉(zhuǎn)子諧波電流較小；③繞組的電流幅值較小；④ 逆變器端的電流諧波較小；⑤系統(tǒng)可靠性較高；⑥對于同體積的電機(jī)，相數(shù)的提高，甚至可以提高輸出力矩和輸入電流的比值。⑦多相異步電機(jī)動態(tài)響應(yīng)較快，穩(wěn)定轉(zhuǎn)矩脈動較小，從而降低系統(tǒng)的機(jī)械共振的可能性，降低電機(jī)運(yùn)行噪聲及轉(zhuǎn)子損耗。⑧另外，多相異步電機(jī)的制造工藝與三相異步電機(jī)相比較，沒有特別的地方，制造成本相當(dāng)。
 五相異步電機(jī)在其中一相斷路的情況，通過改變其它四相的電流，可是使電機(jī)仍然繼續(xù)正常運(yùn)行。本次論文討論的就是基于Maxwell對如何控制五相電機(jī)在其中一相斷路下的控制方法進(jìn)行仿真。

關(guān)鍵詞：多相電機(jī)、5相、有限元仿真、缺相故障、容錯

Abstract
 
 This study mainly focuses on the special capability and the control strategy of five-phase induction machine.
 On the basics of three-phase induction machine, five-phaseinduction machine may be gotten by expending the phases. Furtherly multi-phase induction machine can be gotten, and they have many superior capabilities than three-phase induction machine. It is expecially fit for the large power frequency control system or the high reliability system, with a development foreground.
 While one phase of five-phase induction machine is quit or disconnected in failure, the five-phase induction machine can maintain the round rotation magnetic field by means of adjusting the rest current vectors without changing the hardware structure. So it can be operating in a little droping load, or operating in full load by inceasing the phase currents. This is superior to the three-phase induction machine.
 And compared to three-phase induction motor, the multi-phase induction motors are the main advantages: ① increased frequency of torque ripple (ie, the increasing frequency of the pulse), amplitude decreased; ② smaller rotor harmonic current; ③ winding smaller current amplitude; ④ inverter current harmonic smaller end; ⑤ higher system reliability; ⑥ For the same size motor, the improvement of a few, or even to increase the output torque and the ratio of input current. Multi-phase induction motor ⑦ faster dynamic response, stability, less torque ripple, thereby reducing the system the possibility of mechanical resonance and reduce motor noise and rotor wear and tear. ⑧ In addition, the multi-phase induction motor with the manufacturing process, compared to three-phase induction motor, there is no special place, a considerable manufacturing costs.     Five-phase induction motor circuit in one phase of the situation, by changing the other four-phase current, but continues to allow the normal operation of motor. The discussion paper is based on Maxwell on how to control the five-phase motor circuit in one phase of the control methods under the simulation.Key words: Multiphase motor、5-phase、 FEA Simulation、open phase fault、fault-tolerant