NDLI: Effect of PWM inverters on AC motor bearing currents and shaft voltages

Content Provider	IEEE Xplore Digital Library
Author	Erdman, J.M. Kerkman, R.J. Schlegel, D.W. Skibinski, G.L.
Copyright Year	1972
Abstract	This paper investigates AC induction motor shaft voltage problems, current flow through motor bearings and electric discharge current problems within bearings when operated under both pure sinewave and pulse width modulated (PWM) inverter sources. Experience suggests that PWM voltage sources with steep wavefronts especially increase the magnitude of the above electrical problems, leading to motor bearing material erosion and early mechanical failure. Previous literature suggests that shaft voltage-bearing current problems under 60 Hz sinewave operation are predominantly electromagnetically induced. It is proposed that under PWM operation these same problems are now predominantly an electrostatic phenomenon. A system model to describe this phenomenon is characterized and developed. Construction and test of a new electrostatic shielded induction motor (ESIM) verifies this model and is also a possible solution to the bearing current problem under PWM operation.
Sponsorship	IEEE Industry Applications Society
Starting Page	250
Ending Page	259
Page Count	10
File Size	1608539
File Format	PDF
ISSN	00939994
Volume Number	32
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1996-03-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Pulse width modulation inverters AC motors Shafts Pulse width modulation Induction motors Voltage Electrostatics Fault location Pulse inverters Testing
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Control and Systems Engineering Electrical and Electronic Engineering

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Effect of PWM inverters on AC motor bearing currents and shaft voltages

Bearing currents and shaft voltages of an induction motor under hard- and soft-switching inverter excitation

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Bearing currents and shaft voltages of an induction motor under hard and soft switching inverter excitation

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