NDLI: Field Experience Identifying Electrically Induced Bearing Failures

Content Provider	IEEE Xplore Digital Library
Author	Dahl, D. Sosnowski, D. Schlegel, D. Kerkman, R.J. Pennings, M.
Copyright Year	2007
Description	Author affiliation: Rockwell Autom., Mequon (Dahl, D.; Sosnowski, D.; Schlegel, D.; Kerkman, R.J.)
Abstract	This paper evaluates field test measurements and installation details from a field case study of low voltage AC induction motor bearing failures when operated under a pulse width modulated (PWM) voltage source inverter. Recent experience suggests the steep wave fronts increase the magnitude of the above electrical problems, leading to motor bearing material erosion and early mechanical failure. Until recently, bearing failures from shaft currents were predominantly electromagnetically induced. This paper presents three sources for bearing currents and under PWM operation can be both electrostatic and electromagnetic induced. A field methodology for identifying each source and recommended mitigation is presented. First, a brief history of bearing failures is discussed. Next, the application and a system model presented. An extensive field case study from several motor locations is presented following discussion of a methodology and bearing model found useful in field investigations. Field measurements are reviewed indicating both electrostatic and electromagnetic fields are induced within the motor. The measurements and installation details collected from the various sites quantify the variables that contribute to the different measurement results between motor locations. Effects of system components on shaft voltages and bearing currents are evaluated from field measurements and compared to theory. Quantitative results of solutions to shaft voltage and bearing currents are presented.
Starting Page	155
Ending Page	163
File Size	3041882
Page Count	9
File Format	PDF
ISBN	1424411912
ISSN	01902172
DOI	10.1109/PAPCON.2007.4286295
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-06-24
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Pulse width modulation inverters Electrostatic measurements Electromagnetic measurements Shafts Pulse measurements Pulse width modulation Testing Low voltage Induction motors Pulse inverters motor bearing PWM Adjustable Speed Drive (ASD) shaft voltage bearing current common mode
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Electrical and Electronic Engineering

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