TY - GEN
T1 - Monitoring of airgap eccentricity for inverter-fed induction motors based on the differential inductance
AU - Hong, Jongman
AU - Hyun, Doosoo
AU - Lee, Sang Bin
AU - Kral, Christian
PY - 2012
Y1 - 2012
N2 - Monitoring of airgap eccentricity for induction motors is important for guaranteeing motor reliability, since eccentricity can eventually lead to motor failure due to stator rotor contact. However, there are many limitations to applying existing test methods such as motor current signature analysis (MCSA) in the field, especially for variable frequency applications. In this paper, a new inverter-embedded test approach for detecting eccentricity for induction motors is proposed. The main concept is to use the inverter to perform a standstill test whenever the motor is stopped, to extract information on motor eccentricity. The motor is excited with a low frequency pulsating ac field superimposed on different levels of dc fields, and the variation in the differential inductance pattern due to the change in the degree of magnetic saturation caused by eccentricity is observed. An experimental study on a 7.5 Hp induction motor under controlled eccentricity conditions verifies that the sensitivity of eccentricity detection can be significantly improved compared to existing methods.
AB - Monitoring of airgap eccentricity for induction motors is important for guaranteeing motor reliability, since eccentricity can eventually lead to motor failure due to stator rotor contact. However, there are many limitations to applying existing test methods such as motor current signature analysis (MCSA) in the field, especially for variable frequency applications. In this paper, a new inverter-embedded test approach for detecting eccentricity for induction motors is proposed. The main concept is to use the inverter to perform a standstill test whenever the motor is stopped, to extract information on motor eccentricity. The motor is excited with a low frequency pulsating ac field superimposed on different levels of dc fields, and the variation in the differential inductance pattern due to the change in the degree of magnetic saturation caused by eccentricity is observed. An experimental study on a 7.5 Hp induction motor under controlled eccentricity conditions verifies that the sensitivity of eccentricity detection can be significantly improved compared to existing methods.
KW - AC Machine
KW - Condition Monitoring
KW - Diagnostics
KW - Differential Inductance
KW - Eccentricity
KW - Electrical Fault Detection
KW - Induction Motor
KW - Inverter
UR - http://www.scopus.com/inward/record.url?scp=84870910803&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84870910803&partnerID=8YFLogxK
U2 - 10.1109/ECCE.2012.6342518
DO - 10.1109/ECCE.2012.6342518
M3 - Conference contribution
AN - SCOPUS:84870910803
SN - 9781467308014
T3 - 2012 IEEE Energy Conversion Congress and Exposition, ECCE 2012
SP - 3000
EP - 3007
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 -