NDLI: Unbalanced Magnetic Pull in Train-Lighting Brushless Alternators With Static Eccentricity

Content Provider	IEEE Xplore Digital Library
Author	Pillai, K.P.P. Nair, A.S. Bindu, G.R.
Copyright Year	1967
Abstract	Frequent breakdowns due to broken shafts in three-phase inductor-type brushless alternators that are used in railway coaches for supplying loads like lights and fans and for charging the coach battery have been reported by the Indian Railways. These failures, besides other mechanical reasons, can be attributed to unbalanced magnetic pull (UMP) due to rotor eccentricity. Accurate calculation of the UMP has always proved difficult due to the inability of machine models to cope with air-gap variations. Hence, analytical closed-form expressions are developed in this paper for the calculation of the UMP and for axial flux, considering various rotor positions. The rotor skew and conical motions of the rotor are also taken into account. A 2-D finite-element method is also proposed for the analysis, for the sake of comparison of results. Furthermore, this paper describes a simple method for detecting even a slight rotor asymmetry on the basis of the generated voltage harmonic pattern, which, on further analysis, illustrates how rotor eccentricity can be identified in the alternator for condition-monitoring techniques.
Sponsorship	IEEE Vehicular Technology Society
Starting Page	120
Ending Page	126
Page Count	7
File Size	456391
File Format	PDF
ISSN	00189545
Volume Number	57
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Alternators Rotors Magnetic flux Rail transportation Electric breakdown Shafts Fans Batteries Air gaps Magnetic analysis inductor alternators Electromagnetic analysis finite-element methods (FEMs) harmonic distortion Inductor alternators A Electromagnetic analysis Finite element methods Harmonic distortion
Content Type	Text
Resource Type	Article
Subject	Applied Mathematics Automotive Engineering Computer Networks and Communications Electrical and Electronic Engineering Aerospace Engineering

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