Abstract
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.
Original language | English |
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Title of host publication | Proceedings of IEEE Energy Conversion Congress and Exposition, ECCE |
Number of pages | 7 |
Publication status | Published - 2012 |
Event | IEEE Energy Conversion Congress and Exposition, ECCE - Duration: 15 Sept 2012 → 20 Sept 2012 |
Conference
Conference | IEEE Energy Conversion Congress and Exposition, ECCE |
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Period | 15/09/12 → 20/09/12 |
Research Field
- Not defined
Keywords
- AC Machine; Condition Monitoring; Diagnostics;Differential Inductance; Eccentricity; Electrical Fault Detection;Induction Motor; Inverter.