NDLI: An accurate evaluation of electric discharge machining bearings currents in inverter-driven induction motors

Content Provider	IEEE Xplore Digital Library
Author	Costabile, G. De Vivo, B. Egiziano, L. Tucci, V. Vitelli, M. Beneduce, L. Iovieno, S. Masucci, A.
Copyright Year	2007
Description	Author affiliation: Univ. of Salerno, Salerno (Costabile, G.; De Vivo, B.; Egiziano, L.; Tucci, V.)
Abstract	In inverter motor drives an increasing fraction of faults is associated to the bearings damages induced by circulating currents. Current flow through the bearings is a consequence of two phenomena which, in turn, may depend on the motor speed. The first one gives rise to a conduction current through the motor bearing if a metallic contact takes place between the shaft and frame (for example, by bearing ball contact at low speed). The second one determines a discharge current when the voltage across the bearing lubricating film exceeds the film breakdown voltage (typically at high rotor angular velocity). These currents are responsible of the so called electric discharge machining (EDM) of the bearings. In order to account for such damaging mechanisms an accurate model for the evaluation of bearings currents in inverter-driven induction motors has been developed and is presented in this paper. The statistical occurrence of the discharges is also taken into account in a simple but accurate way. The model allows to estimate the characteristics of the discharge pulses in typical PWM inverter driven traction motors and hence the energy levels producing the onset of the bearings' damage.
Starting Page	1
Ending Page	8
File Size	1052065
Page Count	8
File Format	PDF
ISBN	9789275815108
DOI	10.1109/EPE.2007.4417329
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-09-02
Publisher Place	Denmark
Access Restriction	Subscribed
Rights Holder	EPE Association
Subject Keyword	Motor drives Induction motors Rotors Machining Traction motors Statistical Model Pulse width modulation inverters Shafts Breakdown voltage Adjustable Speed Drives Induction Motor Pulse Width Modulation Angular velocity Pulse inverters Bearing Currents
Content Type	Text
Resource Type	Article

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