本文選題：發(fā)電機 + 氣隙偏心��； 參考：《華北電力大學(xué)》2017年碩士論文

【摘要】：本文以SDF-9型故障模擬發(fā)電機為研究對象,對發(fā)電機正常運行、氣隙徑向靜偏心故障、氣隙軸向靜偏心故障、氣隙徑向動偏心故障,以及氣隙徑向復(fù)合偏心故障下轉(zhuǎn)子在不同方向上的磁拉力特性進(jìn)行了分析。論文所做的主要工作和取得的成果如下:(1)理論推導(dǎo)得到了發(fā)電機轉(zhuǎn)子在正常運行及氣隙徑向靜偏心、動偏心、動靜復(fù)合偏心故障下的轉(zhuǎn)子徑向不平衡磁拉力通用解析表達(dá)式,氣隙軸向靜偏心故障下的轉(zhuǎn)子軸向不平衡磁拉力及切向電磁轉(zhuǎn)矩的通用解析表達(dá)式,并分析得到了轉(zhuǎn)子不平衡磁拉力的特征頻率成分及幅值與不同類型、不同程度氣隙偏心故障的對應(yīng)關(guān)系;(2)在通用電機有限元計算軟件Ansoft平臺上建立了SDF-9型故障模擬發(fā)電機正常運行和四種不同類型氣隙偏心故障所對應(yīng)的物理求解模型和耦合電路模型,計算得到了不同運行狀態(tài)下轉(zhuǎn)子各向磁拉力的時域波形及其頻譜;(3)在實驗室SDF-9型7.5k W故障模擬發(fā)電機上完成了正常運行及氣隙徑向靜偏心故障下轉(zhuǎn)子不平衡磁拉力激勵導(dǎo)致的徑向振動響應(yīng)特性驗證,同時結(jié)合韓國漢陽大學(xué)五對極1600k W實驗機組氣隙軸向靜偏心下的軸向磁拉力數(shù)據(jù)和韓國蔚山大學(xué)1.5k W無刷直流電機氣隙徑向動偏心故障下的定子電流頻譜數(shù)據(jù),與理論分析和有限元數(shù)值計算結(jié)果進(jìn)行了對比,結(jié)果一致;(4)提出關(guān)鍵特征頻率成分進(jìn)行比對的方法來分別區(qū)分各類靜偏心故障和動偏心故障,并歸納出不同氣隙偏心故障類別對不平衡磁拉力影響的敏感程度。論文成果對于在現(xiàn)有基礎(chǔ)上提高發(fā)電機在氣隙靜偏心、氣隙動偏心以及氣隙復(fù)合偏心故障下的診斷精度提供了理論參考和應(yīng)用基礎(chǔ)。
[Abstract]:In this paper, the SDF-9 fault simulation generator is taken as the research object. For the normal operation of the generator, the air gap radial static eccentricity fault, the air gap axial static eccentricity fault, the air gap radial dynamic eccentricity fault. The magnetic pull characteristics of the rotor in different directions under the radial composite eccentric fault of the air gap are analyzed. The main work and achievements are as follows: (1) the general analytical expressions of rotor radial unbalance magnetic pull force under normal operation, radial eccentricity of air gap and composite eccentricity are derived theoretically. The general analytical expressions of rotor axial unbalanced magnetic pull force and tangential electromagnetic torque under axial eccentricity fault of air gap are obtained. The characteristic frequency components and amplitude of rotor unbalanced magnetic pull force and different types of rotor unbalance magnetic pull force are obtained. (2) the physical solution model of SDF-9 fault simulation generator in normal operation and four different types of air gap eccentric fault is established on the platform of general motor finite element calculation software Ansoft. And coupled circuit models, The time-domain waveform and its frequency spectrum of rotor magnetic pull forces in different operating conditions are obtained. (3) the rotor unbalanced magnetic pull is completed on the laboratory SDF-9 7.5kW fault simulation generator under the condition of normal operation and static eccentricity fault of air gap radial direction. Verification of radial vibration response caused by force excitation, At the same time, the data of axial magnetic pull force under axial eccentricity of air gap and stator current spectrum data of 1.5kW brushless DC motor under radial eccentricity fault of air gap are combined with 1600kW experimental set of five pairs of poles in Hanyang University, Korea. The results are consistent with the theoretical analysis and finite element numerical results. (4) A method of comparing the key characteristic frequency components is proposed to distinguish the static eccentricity faults from the dynamic eccentricity faults respectively. The sensitivity of different air gap eccentricity fault types to unbalanced magnetic pull force is concluded. The results of this paper provide a theoretical reference and application basis for improving the diagnostic accuracy of generator under the condition of static eccentricity of air gap, dynamic eccentricity of air gap and composite eccentricity of air gap.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM31

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本文編號：2059456