Abstract
The 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 the motor current signature analysis
in the field, particularly 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. Themotor
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 with existing methods.
Original language | English |
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Pages (from-to) | 2533-2542 |
Number of pages | 10 |
Journal | IEEE Transactions on Industry Applications |
Publication status | Published - 2013 |
Research Field
- Former Research Field - Low Emission Transport
Keywords
- Alternating-current (ac) machine
- condition monitoring
- diagnostics
- differential inductance
- eccentricity
- electrical fault detection
- induction motor
- inverter