1、 33 6 S Vol.33 No.6 Feb.25, 2013 2013 M 2 25 Proceedings of the CSEE 2013 Chin.Soc.for Elec.Eng. 93 cI| 0258-8013 (2013) 06-0093-08 ms | TM 346 DS A Ss | 47040 # #p8 #Z k g 7 O V ?/ . v Y#+Y z . ,v . b “ 7 9F? v Al 7?v a v . , “ - M pb 1v . %i O1 T| T yN0 . 1ob 0 # b # 5 P#H 3M0 ?S 50M byN#p #pr A 1
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21、8-72(in Chinese) l 2012-11-27b Te k (1972) 3 q1V Y !9 / Z ST g (1988) 3 V 31VY !9KsZ T b k (3 I t D ) Extended Summary n pp.93-100 S12 Review and Prospect of Air-gap Eccentricity Faults in Induction Machines BAO Xiaohua, L Qiang (School of Electrical Engineering and Automation, Hefei University of
22、Technology) KEY WORDS: induction machine; air-gap eccentricity; fault diagnosis; unbalanced magnetic pull; vibration Compared with DC machines and synchronous machines, induction machines have the advantages of simple structure, reliable operation, low manufacturing cost, etc. As a result, induction
23、 machines are widely used and in great demand. About 90 percent of the electric transmission systems are driven by induction machines. And induction machines account for about 60 percentage of the total grid load. Large induction machines are used in a variety of large-scale machinery such as compre
24、ssors, crushers and pumps. Sudden breakdown of these machineries, especially large high-voltage submersible induction machines used in mining, would bring about great economic losses or severe accidents. These machines always exhibit a certain degree of air-gap eccentricity. Small eccentricity will
25、lead to air-gap field distortion, and serious eccentricity will lead to a rub between the stator and the rotor. Hence, it is of great importance to investigate the air-gap eccentricity faults. Air-gap eccentricity can be divided into two basic categories: static eccentricity (where the rotor is disp
26、laced from the stator core center but not on its own axis) and dynamic eccentricity (where the rotor is still turning upon the stator core center but not on its own center). Fig. 1 illustrates the basic categories of air-gap eccentricity. Other kinds of eccentricity, such as mixed eccentricity and i
27、nclined eccentricity, are combinations of these two basic eccentricities. The effects of interest caused by air-gap eccentricity in a three-phase squirrel- cage induction machine mainly include winding current harmonics, inductance, air gap flux, unbalanced magnetic pull between the rotor and the st
28、ator, vibration, increased losses, torque variation, etc. A survey on the research of air-gap eccentricity in the induction machine is given in this paper. The future research prospect of air-gap eccentricity faults is also discussed based on the current problems and deficiencies. Motor current sign
29、ature analysis is widely used in the condition monitoring and fault diagnosis of electrical machines. When an induction machine exhibits air-gap statorrotoresta tic eccentricityeunchangeable minimum air gap positioneOrotating min im um a ir gap positionOrotation center O rotation center Odynamic ecc
30、entricity e(a) Static eccentricity (b) Dynamic eccentricity Fig. 1 Basic categories of air-gap eccentricity eccentricity, the frequency components of interest in the stator currents are given by 1( ) hdsf kR n fp= (1) The stator currents are theoretically derived by the multi-loop model, and the ind
31、uctances are calculated by the winding function approach. Air-gap eccentricity is a normal cause of unbalanced magnetic pull. It contains a time-independent part (points to the position of minimum air gap) and a time-dependent part (fluctuates at twice the electrical frequency). The calculation meth
32、ods employed include the analytical method and the finite element method. Vibration caused by air-gap eccentricity is also an important fault signature. It can be used in detecting some special eccentricity which can not be detected by motor current signature analysis. A more precise model of eccent
33、ricity named as curved dynamic eccentricity is proposed in this paper. Fig. 2 illustrates the curved dynamic eccentricity, based on a three-phase 2800 kW submersible induction machine with rub-impact fault. Other research such as fault diagnosis under complex conditions is also mentioned. statorrotorlu ldrubbed areal1l2Fig. 2 Rub-impact fault in a submersible induction motor
