TY - GEN
T1 - Evaluation of the influence of rotor axial air ducts on condition monitoring of induction motors
AU - Lee, Sungho
AU - Hong, Jongman
AU - Lee, Sang Bin
AU - Wiedenbrug, Ernesto
AU - Teska, Mike
AU - Kim, Heedong
PY - 2012
Y1 - 2012
N2 - Rotor axial air ducts are used in large motors for cooling and reduction of weight and material. The rotor axial ducts can produce twice slip-frequency, 2sfs, components in the vibration, or current spectrum that can be misinterpreted as induction motor rotor faults. There is currently no practical solution to the air duct-induced false positive indications, which is an on-going problem in the field. However, there are only a few publications that report the issues caused by rotor axial ducts. In this paper, the influence of the rotor air ducts on motor condition monitoring is analyzed, and investigated through testing in the field on 6.6kV motors and in the lab. The experimental study shows that the magnitude of the 2sfs component due to axial ducts depend on the design, material, construction, and operating conditions of the motor. It is also shown that the 2sfs component can even decrease with broken bars depending on the fault position relative to the ducts, which makes on-line condition monitoring difficult. Guidelines for reliable motor testing and interpretation of test results are also provided.
AB - Rotor axial air ducts are used in large motors for cooling and reduction of weight and material. The rotor axial ducts can produce twice slip-frequency, 2sfs, components in the vibration, or current spectrum that can be misinterpreted as induction motor rotor faults. There is currently no practical solution to the air duct-induced false positive indications, which is an on-going problem in the field. However, there are only a few publications that report the issues caused by rotor axial ducts. In this paper, the influence of the rotor air ducts on motor condition monitoring is analyzed, and investigated through testing in the field on 6.6kV motors and in the lab. The experimental study shows that the magnitude of the 2sfs component due to axial ducts depend on the design, material, construction, and operating conditions of the motor. It is also shown that the 2sfs component can even decrease with broken bars depending on the fault position relative to the ducts, which makes on-line condition monitoring difficult. Guidelines for reliable motor testing and interpretation of test results are also provided.
UR - http://www.scopus.com/inward/record.url?scp=84870926214&partnerID=8YFLogxK
U2 - 10.1109/ECCE.2012.6342360
DO - 10.1109/ECCE.2012.6342360
M3 - Conference contribution
AN - SCOPUS:84870926214
SN - 9781467308014
T3 - 2012 IEEE Energy Conversion Congress and Exposition, ECCE 2012
SP - 3016
EP - 3023
BT - 2012 IEEE Energy Conversion Congress and Exposition, ECCE 2012
T2 - 4th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2012
Y2 - 15 September 2012 through 20 September 2012
ER -