Coupled Fluid-Thermal Analysis for Induction Motors with Broken Bars Operating under the Rated Load

Thermal stress of the rotor in a squirrel cage induction motor is generated due to the temperature rise, it is also one of the factors causing the broken bar fault because the structure of the rotor would be destroyed if the stress of the rotor bars exceed the strength limit. The coupled fluid-thermal analysis for the induction motor with healthy and broken bar rotors is performed in this paper. Much concern has been committed to establishment of the fluid model on the basis of computational fluid dynamic (CFD) theory. The heat field of the prototypes is analysed so that the effect of the asymmetrical rotor on the motor heat performance can be investigated in depth. Eventually, the efficiency of the presented model and method, for the totally enclosed fan cooled (TEFC) induction motor, can be verified through experimental results. In addition, this paper reports a quantitative analysis of the heat flux distribution of the fault rotor, and the heat flux density of the bars is investigated in detail. Then, the part most likely to break in the rotor as a result of the thermal load is identified.

[1]  Hayde Peregrina-Barreto,et al.  Vibration Analysis of Partially Damaged Rotor Bar in Induction Motor under Different Load Condition Using DWT , 2016 .

[2]  H. Selcuk Nogay.  Prediction of internal temperature in stator winding of three‐phase induction motors with ann , 2011 .

[3]  N.Y. Abed,et al.  Modeling and Characterization of Induction Motor Internal Faults Using Finite-Element and Discrete Wavelet Transforms , 2007, IEEE Transactions on Magnetics.

[4]  Fengxiang Wang,et al.  Temperature rise calculation of high speed PM machine based on thermal-circuit method and 3D fluid field method , 2011, 2011 International Conference on Electrical Machines and Systems.

[5]  H. Kapeller,et al.  Comparison of a CFD Analysis and a Thermal Equivalent Circuit Model of a TEFC Induction Machine With Measurements , 2009, IEEE Transactions on Energy Conversion.

[6]  Babak Fahimi,et al.  Thermal Modeling and Analysis of a Double-Stator Switched Reluctance Motor , 2015, IEEE Transactions on Energy Conversion.

[7]  Ding Shu-ye,et al.  NUMERICAL CALCULATION OF LARGE SYNCHRONOUS GENERATOR STATOR TEMPERATURE FIELDS BASED ON COUPLED FIELDS , 2005 .

[8]  J. Mroz.  Temperature field of a double squirrel-cage motor during startup , 2005 .

[9]  Liyi Li,et al.  Thermal analysis of high speed motor based on flow field calculation considering tooth-slots effects , 2011, 2011 International Conference on Electrical Machines and Systems.

[10]  Eduardo Cabal-Yepez,et al.  Novel Methodology for Online Half-Broken-Bar Detection on Induction Motors , 2009, IEEE Transactions on Instrumentation and Measurement.

[11]  George Nikolakopoulos,et al.  Broken bars fault diagnosis based on uncertainty bounds violation for three‐phase induction motors , 2015 .

[12]  Andrzej M. Trzynadlowski,et al.  Comparative investigation of diagnostic media for induction motors: a case of rotor cage faults , 1999, Conference Record of the 1999 IEEE Industry Applications Conference. Thirty-Forth IAS Annual Meeting (Cat. No.99CH36370).

[13]  D. A. Howey,et al.  Measurement and CFD Prediction of Heat Transfer in Air-Cooled Disc-Type Electrical Machines , 2011, IEEE Transactions on Industry Applications.

[14]  V. Fireteanu,et al.  Finite Element Diagnosis of Squirrel Cage Induction Motors with Rotor Bar Faults , 2006 .

[15]  Xie Ying.  Performance Evaluation and Thermal Fields Analysis of Induction Motor With Broken Rotor Bars Located at Different Relative Positions , 2010, IEEE Transactions on Magnetics.

[16]  J. Sprooten,et al.  Influence of Saturation Level on the Effect of Broken Bars in Induction Motors Using Fundamental Electromagnetic Laws and Finite Element Simulations , 2009, IEEE Transactions on Energy Conversion.

[17]  D. Trichet,et al.  A statistical approach of temperature calculation in electrical machines , 2000 .

[18]  Thomas M. Jahns,et al.  Coupled electromagnetic-thermal analysis of electric machines including transient operation based on finite element techniques , 2013, 2013 IEEE Energy Conversion Congress and Exposition.

[19]  Andrea Cavagnino,et al.  Solving the more difficult aspects of electric motor thermal analysis in small and medium size industrial induction motors , 2005 .

[20]  Kankanhalli N. Seetharamu,et al.  Transient thermal analysis of induction motors , 1998 .

[21]  Mario Eltabach,et al.  A comparison of external and internal methods of signal spectral analysis for broken rotor bars detection in induction motors , 2004, IEEE Transactions on Industrial Electronics.

[23]  Xie Ying.  Characteristic Performance Analysis of Squirrel Cage Induction Motor With Broken Bars , 2009 .

[24]  Arturo Garcia-Perez,et al.  Startup current analysis of incipient broken rotor bar in induction motors using high-resolution spectral analysis , 2011, 8th IEEE Symposium on Diagnostics for Electrical Machines, Power Electronics & Drives.