NDLI: Bearing Fault Model for Induction Motor With Externally Induced Vibration

Content Provider	IEEE Xplore Digital Library
Author	Immovilli, F. Bianchini, C. Cocconcelli, M. Bellini, A. Rubini, R.
Copyright Year	1982
Abstract	This paper investigates the relationship between vibration and current in induction motors operated under external vibrations. Two approaches are usually available to define this relationship. The former is based on airgap variations, while the latter is based on torque perturbation. This paper is focused on the airgap variation model. The ball bearing fault is modeled by contact mechanics. External vibrations often occur in many industrial applications where externally induced vibrations of suitable amplitude cause cyclic radial loading on the machine shaft. The model is validated by experiments, owing to a dedicated test setup, where an external vibration source (shaker) was employed, together with ball bearing alterations in order to decrease the stiffness of the support along the radial direction. To maximize the effects of externally induced vibrations, the frequency chosen was near the flexural resonance of the rotor (determined by finite-element method analysis). The direction of the external vibration is radial with respect to the axis of the electric machine under test. During tests, both stator phase currents and vibration of the machine were sampled. The test setup allowed one to vary the machine speed and load, vibration amplitude, and bearing stiffness (damage level). Radial effects are usually visible only in the case of large failures that result in significant airgap variations, as confirmed by experiments.
Sponsorship	IEEE Industrial Electronics Society
Starting Page	3408
Ending Page	3418
Page Count	11
File Size	1441102
File Format	PDF
ISSN	02780046
Volume Number	60
Issue Number	8
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Vibrations Frequency modulation Rotors Atmospheric modeling Shafts Force Stators vibration measurement Airgaps ball bearings condition monitoring current measurement fault diagnosis frequency domain analysis harmonic analysis induction motors modulation
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Electrical and Electronic Engineering Computer Science Applications

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