
Digital Library of the
European Council for Modelling and Simulation 
Title: 
Spectral Study On The Voltage Waveform Of Claw Pole Automotive
Alternator 
Authors: 
Mini K. Idiculla, K.P.P. Pillai, Achuthsankar S. Nair 
Published in: 
(2006).ECMS
2006 Proceedings edited by: W. Borutzky, A. Orsoni, R. Zobel. European
Council for Modeling and Simulation. doi:10.7148/2006 ISBN:
0955301807 20^{th}
European Conference on Modelling and Simulation, Bonn,
May 2831, 2006 
Citation
format: 
Pillai, K. P. P., Idiculla, M. K.,
& Nair, A. S. (2006). Spectral Study On The Voltage Waveform Of Claw Pole
Automotive Alternator. ECMS 2006 Proceedings edited by: W. Borutzky, A.
Orsoni, R. Zobel (pp. 456461). European Council for
Modeling and Simulation. doi:10.7148/20060456 
DOI: 
http://dx.doi.org/10.7148/20060456 
Abstract: 
An increased
number of vehicle functions necessitated by legislation and customer expectations
have introduced many electronic control systems and electrically driven units
in vehicles. The drastic increase in the non linear loads associated with the
introduction of new technologies, produces distorted voltage and current
waveforms which introduces harmonics. It is in this context of electrical
distribution, that the Kfactor was evolved for distribution transformers to compensate for the additional heating effects generated by the
harmonic currents. This paper presents a spectral study of the voltage wave
form of the claw pole automotive alternator under no load, balanced and
unbalanced loads to estimate the variation of harmonic contents under these operating
conditions. Theoretical study has been conducted using 3D finite element
method and is supplemented by the experimental work on a 12 pole claw pole
alternator. The K factor has been computed and the design features needed in
a highly nonlinear environment with K>4 are also suggested for the
electrical, magnetic and dielectric circuits of the claw pole alternator. 
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