TY - GEN
T1 - Automated monitoring of magnet quality for permanent magnet synchronous motors at standstill
AU - Hong, Jongman
AU - Hyun, Doosoo
AU - Lee, Sang Bin
AU - Yoo, Jiyoon
AU - Lee, Kwangwoon
PY - 2009
Y1 - 2009
N2 - Demagnetization of permanent magnets (PM) used in synchronous motors (SM) can occur due to a combination of thermal, electrical, and/or environmental operating stresses. Since PM demagnetization results in degradation of motor performance, efficiency, and reliability, it is important to monitor the quality of PMs regularly. However, there are many limitations to the off-line and on-line methods currently used for magnet quality assessment. In this paper, a new inverter-embedded technique for automated monitoring of magnet quality for permanent magnet synchronous motors (PMSM) that overcomes the limitations of existing techniques is proposed. The main concept is to use the inverter to perform a standstill test whenever the motor is stopped to detect local or uniform PM demagnetization. The machine is excited with a pulsating field at different angular positions, and the change in the current peaks caused by the change in the degree of magnetic saturation due to demagnetization is observed. An experimental study on a 10hp PMSM verifies that local and uniform PM demagnetization can be detected with high sensitivity.
AB - Demagnetization of permanent magnets (PM) used in synchronous motors (SM) can occur due to a combination of thermal, electrical, and/or environmental operating stresses. Since PM demagnetization results in degradation of motor performance, efficiency, and reliability, it is important to monitor the quality of PMs regularly. However, there are many limitations to the off-line and on-line methods currently used for magnet quality assessment. In this paper, a new inverter-embedded technique for automated monitoring of magnet quality for permanent magnet synchronous motors (PMSM) that overcomes the limitations of existing techniques is proposed. The main concept is to use the inverter to perform a standstill test whenever the motor is stopped to detect local or uniform PM demagnetization. The machine is excited with a pulsating field at different angular positions, and the change in the current peaks caused by the change in the degree of magnetic saturation due to demagnetization is observed. An experimental study on a 10hp PMSM verifies that local and uniform PM demagnetization can be detected with high sensitivity.
KW - AC machine
KW - Condition monitoring
KW - Demagnetization
KW - Diagnostics
KW - Inverter
KW - NdFeB Magnet
KW - Off-line testing
KW - Permanent magnet
KW - Pulsating magnetic field
KW - Synchronous motor
UR - http://www.scopus.com/inward/record.url?scp=72449150633&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=72449150633&partnerID=8YFLogxK
U2 - 10.1109/ECCE.2009.5316464
DO - 10.1109/ECCE.2009.5316464
M3 - Conference contribution
AN - SCOPUS:72449150633
SN - 9781424428939
T3 - 2009 IEEE Energy Conversion Congress and Exposition, ECCE 2009
SP - 2326
EP - 2333
BT - 2009 IEEE Energy Conversion Congress and Exposition, ECCE 2009
T2 - 2009 IEEE Energy Conversion Congress and Exposition, ECCE 2009
Y2 - 20 September 2009 through 24 September 2009
ER -