NDLI: Condition Monitoring of DC-Link Electrolytic Capacitors in Adjustable-Speed Drives

Content Provider	IEEE Xplore Digital Library
Author	Kwang-Woon Lee Myungchul Kim Jangho Yoon Sang Bin Lee Ji-Yoon Yoo
Copyright Year	1972
Abstract	A new preventive maintenance strategy for the sensorless condition monitoring of inverter dc-link aluminum electrolytic capacitors based on equivalent series resistance (ESR) and capacitance C estimation is proposed. The main concept of the proposed method is to estimate the ESR and C of the capacitor, using the inverter whenever the motor is stopped. The parameters are estimated from the dc-link voltage and stator current measurements available in the inverter with the switched dc-link voltage applied to the motor stator winding. The temperature of the capacitor can also be estimated under thermal equilibrium based on the stator resistance estimate to take the influence of temperature variation into account. An experimental study on a 250-W permanent magnet synchronous motor performed under accelerated capacitor degradation is presented to verify the proposed technique. It is shown that the proposed method provides a reliable and sensitive indication of capacitor aging without additional hardware requirements for reliable, efficient, and safe operation of the inverter and driven process.
Sponsorship	IEEE Industry Applications Society
Starting Page	1606
Ending Page	1613
Page Count	8
File Size	987114
File Format	PDF
ISSN	00939994
Volume Number	44
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-09-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Condition monitoring Capacitors Variable speed drives Inverters Paramagnetic resonance Synchronous motors Voltage Stators Permanent magnet motors Thermal resistance stator resistance estimation Adjustable-speed drive aluminum electrolytic capacitor capacitance condition monitoring dc-link capacitor diagnostics electrolyte equivalent series resistance (ESR)
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Control and Systems Engineering Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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