Current analysis of large submersible motor under curved eccentricity by multi-loop method

Air-gap eccentricity is commonly occurred in large induction motors, especially submersible motors. Based on this failure, a more accurate curved eccentricity model is established and current analysis of the faulty machine is conducted in this paper. To carry out calculation, winding function method is proposed aiming at calculation of the inductance matrix in the multi-loop model and theoretical derivation is also presented. A curved eccentricity model is set up by simulating the deflection of the shaft and such model is applied to prototype (1200 kW submersible motor). By analyzing harmonic characteristics in line current, the result proves feasibility of current monitoring on curved eccentricity.

[1]  Xianghui Huang,et al.  Improved online condition monitoring using static eccentricity-induced negative sequence current information in induction machines , 2005, 31st Annual Conference of IEEE Industrial Electronics Society, 2005. IECON 2005..

[2]  Hamid A. Toliyat,et al.  A method for dynamic simulation of air-gap eccentricity in induction machines , 1996 .

[3]  H. A. Toliyat,et al.  Performance Analysis of a Three-Phase Induction Motor under Mixed Eccentricity Condition , 2002, IEEE Power Engineering Review.

[4]  Jafar Milimonfared,et al.  A comprehensive method for the calculation of inductance coefficients of cage induction machines , 2003 .

[5]  Y. Akiyama.  Unbalance-heating phenomena of induction motor with eccentric rotor , 1992, Conference Record of the 1992 IEEE Industry Applications Society Annual Meeting.

[6]  A. Ghoggal.  A new model of rotor eccentricity in induction motors considering the local air-gap over-flux concentration , 2013 .

[7]  Arash Kiyoumarsi,et al.  A new analytical technique for analysis of the rotor eccentricity in rotating electrical machines , 2009 .

[8]  Antero Arkkio,et al.  Electromagnetic forces in cage induction motors with rotor eccentricity , 2003, IEEE International Electric Machines and Drives Conference, 2003. IEMDC'03..

[9]  H.A. Toliyat,et al.  Modeling and analysis of cage induction motors under rotor misalignment and air gap eccentricity , 2005, Fourtieth IAS Annual Meeting. Conference Record of the 2005 Industry Applications Conference, 2005..

[10]  T.A. Lipo,et al.  Multiple coupled circuit modeling of induction machines , 1993, Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting.

[11]  J. Penman,et al.  Dynamic simulation of dynamic eccentricity in induction machines-winding function approach , 2000 .

[12]  Yigang He,et al.  Influence of Thermal Expansion on Eccentricity and Critical Speed in Dry Submersible Induction Motors , 2014 .

[13]  Yigang He,et al.  Inductances Evaluation of a Squirrel-Cage Induction Motor with Curved Dynamic Eccentricity , 2014 .

[14]  J. M. Gojko,et al.  Skew and linear rise of MMF across slot modelling-winding function approach , 1999 .

[15]  Hamid A. Toliyat,et al.  A novel method for modeling dynamic air-gap eccentricity in synchronous machines based on modified winding function theory , 1998 .

[16]  Jawad Faiz,et al.  An evaluation of inductances of a squirrel-cage induction motor under mixed eccentric conditions , 2003 .

[17]  W. T. Thomson,et al.  Vibration and current monitoring for detecting airgap eccentricity in large induction motors , 1986 .