双斜槽感应电机气隙偏心时的径向电磁力分析
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摘要
为了分析双斜槽感应电机偏心情况下的电磁激振力,以一台笼型双斜槽感应电机为例,采用解析法分析了动偏心和静偏情况下的气隙磁密成分,并得到了不同阶次谐波相互作用产生的平均径向电磁激振力的阶次与幅值表达式。针对双斜槽感应电机,提出了适用于双斜槽的多层分段有限元模型,并获得了径向气隙磁密与径向电磁激振力的时空分布。利用二维傅里叶分解法,获取了平均径向电磁力的时空频谱,并与直槽偏心时的径向电磁力相对比,发现双斜槽能够有效削弱由偏心导致的部分附加径向电磁力。
To analyze the electromagnetic force of a double skewed slot induction motor under air-gap eccentricity,a squirrel-cage induction motor with double skewed slot is taken as an example. The composition of air gap magnetic flux density under dynamic eccentricity and static eccentricity was analyzed by analytic method. The expressions of the order and amplitude of the average radial electromagnetic exciting force generated by different order harmonic interactions were obtained. A multi-slice model suitable for double skewed slots was proposed in this paper. The time and space distributions of the radial flux density and the radial electromagnetic force were obtained. The two-dimensional Fourier decomposition method was adopted to get the space and time spectrum of the radial electromagnetic force. Compared with the straight slot,it is found that part of additional radial electromagnetic force caused by eccentricity is effectively weakened by double skewed slot.
To analyze the electromagnetic force of a double skewed slot induction motor under air-gap eccentricity,a squirrel-cage induction motor with double skewed slot is taken as an example. The composition of air gap magnetic flux density under dynamic eccentricity and static eccentricity was analyzed by analytic method. The expressions of the order and amplitude of the average radial electromagnetic exciting force generated by different order harmonic interactions were obtained. A multi-slice model suitable for double skewed slots was proposed in this paper. The time and space distributions of the radial flux density and the radial electromagnetic force were obtained. The two-dimensional Fourier decomposition method was adopted to get the space and time spectrum of the radial electromagnetic force. Compared with the straight slot,it is found that part of additional radial electromagnetic force caused by eccentricity is effectively weakened by double skewed slot.
引文
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[2]狄冲,鲍晓华,王汉丰,等.感应电机混合偏心情况下径向电磁激振力的研究[J].电工技术学报,2014(s1):138.DI Chong,BAO Xiaohua,WANG Hanfeng,et al.Study on radical electromagnetic excitation forces of induction motor under mixed eccentricity[J].Transactions of China Electrotechnical Society,2014(s1):138.
[3]PILLAI K P P,NAIR A S,BINDU G R.Unbalanced magnetic pull in train-lighting brushless alternators with static eccentricity[J].IEEE Transactions on Vehicular Technology,2008,57(1):120.
[4]LI J T,LIU Z J,NAY L H A.Effect of radial magnetic forces in permanent magnet motors with rotor eccentricity[J].IEEE Transactions on Magnetics,2007,43(6):2525.
[5]SAMAGA R,VITTAL K P.Air gap mixed eccentricity severity detection in an induction motor[C]//IEEE International Conference on Recent Advances in Intelligent Computational Systems,2011:115-119.
[6]孙立军,吕志香,刘海丽,等.基于DSO-2100的异步电机转子偏心故障检测与诊断[J].电机与控制学报,2005,9(6):537.SUN Lijun,LU Zhixiang,LIU Haili,et al.A detection and diagnosis system of rotor eccentricity in asynchronous motor with DSO-2100[J].Electric Machines and Control,2005,9(6):537.
[7]王祥珩.多支路同步电机无载时定子内部故障的分析方法[J].中国电机工程学报,1987,7(5):3.WANG Xiangheng.The analyzing method of stator internal fault of synchronous machine with multi-branch on no-load[J].Proceedings of the CSEE,1987,7(5):3.
[8]LI Xiaodong,WU Qing,NANDI S.Performance analysis of a three-phase induction machine with inclined static eccentricity[J].IEEE Transactions on Industry Applications,2007,43(2):531.
[9]WANG Lang,BAO Xiaohua,DI Chong,et al.Influence on vibration and noise of squirrel-cage induction machine with double skewed rotor for different slot combinations[J].IEEE Transactions on Magnetics,2016,52(7):1.
[10]AHN H,JANG G,CHANG J,et al.Reduction of the torque ripple and magnetic force of a rotatory two-phase transverse flux machine using herringbone teeth[J].IEEE Transactions on Magnetics,2008,44(11):4066.
[11]HYUN D,LEE S,HONG J,et al.Detection of airgap eccentricity for induction motors using the single-phase rotation test[J].IEEE Transactions on Energy Conversion,2012,27(3):689.
[12]CASSORET B,CORTON R,ROGER D,et al.Magnetic noise reduction of induction machines[J].IEEE Transactions on Power Electronics,2003,18(2):570.
[13]LAI H C,RODGER D.Comparison of 2D and 3D finite element modelling results of a skewed induction machine[C]//2002 International Conference on Power Electronics,Machines and Drives,IET,2002:365-368.Society,2011,26(11):135.