Detection of Airgap Eccentricity for Permanent Magnet Synchronous Motors Based on the d-Axis Inductance

The majority of the work performed for detecting eccentricity faults for permanent magnet synchronous motors (PMSM) focus on motor current signature analysis (MCSA), as it provides continuous online monitoring with existing current sensors. However, MCSA cannot be applied under nonstationary conditi...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2012-05, Vol.27 (5), p.2605-2612
Main Authors: Jongman Hong, Sang Bin Lee, Kral, Christian, Haumer, Anton
Format: Article
Language:English
Subjects:
Airgap eccentricity
Applied sciences
condition monitoring
Demagnetization
diagnostics
Eccentricity
Electrical engineering. Electrical power engineering
Electrical machines
Electronic equipment and fabrication. Passive components, printed wiring boards, connectics
Electronics
Exact sciences and technology
Faults
Finite element analysis
Inductance
Magnetic circuits
Magnetic flux
magnetic saturation
Miscellaneous
motor current signature analysis (MCSA)
Motors
Oscillations
permanent magnet synchronous motor (PMSM)
Permanent magnets
Power electronics, power supplies
Regulation and control
Rotors
Saturation magnetization
Sensors
Stators
Synchronous motors
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Summary:The majority of the work performed for detecting eccentricity faults for permanent magnet synchronous motors (PMSM) focus on motor current signature analysis (MCSA), as it provides continuous online monitoring with existing current sensors. However, MCSA cannot be applied under nonstationary conditions and cannot distinguish faults with load torque oscillations, which are limitations for many PMSM drive applications. In this paper, it is shown that the d-axis inductance L decreases with an increase in the severity of eccentricity due to the change in the degree of magnetic saturation, and it is proposed as a new fault indicator. The inverter can be used to perform a standstill test automatically whenever the motor is stopped to measure L for eccentricity testing independent of load variations or oscillations, which is not possible with MCSA. An finite element and experimental study on a 10-hp PMSM verifies that eccentricity can be detected independent of the load with high sensitivity and reliability.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2011.2176145