Commutation modelling and sparks reduction based on coupled circuit method
Article first published online: 30 MAY 2012
Copyright © 2012 John Wiley & Sons, Ltd.
International Journal of Numerical Modelling: Electronic Networks, Devices and Fields
Volume 27, Issue 4, pages 637–648, July/August 2014
How to Cite
Kelaiaia, M. S., Labar, H., Bounaya, K., Kelaiaia, S. and Mesbah, T. (2014), Commutation modelling and sparks reduction based on coupled circuit method. Int. J. Numer. Model., 27: 637–648. doi: 10.1002/jnm.1845
- Issue published online: 18 JUN 2014
- Article first published online: 30 MAY 2012
- Manuscript Accepted: 13 APR 2012
- Manuscript Revised: 18 FEB 2012
- Manuscript Received: 19 AUG 2011
- electromagnetic modelling;
- coupled circuit
The commutating machines have a notable effect on the exchanges in brush–commutator contact area, which is particularly obvious when determining the intensity of sparks located on the brush. With time, higher current density at the descending edge promote sparks excitation, which itself increases intensity of the electrical erosion, brush temperature and thus also the wear. So in order to make an analytical study of commutation phenomenon, the coupled circuit method was developed. Therefore, a generalized mathematical model of the commutation, for brush–commutator, is established and can be extended for any other types of commutation on the basis of electromagnetic field (e.g. transformers and phase shift transformer. This model provides a greater efficiency to explain the impact of the electromagnetic fluxes surrounding brush area (or switch), specially for the current transition of the commutation process. Successful commutation is defined as operation in normal service, with no serious damages to the commutator, brushes or switches due to sparking that might require abnormal maintenance. It is recognized that some visible sparking are not evidence of unsuccessful commutation. The recommendation to improve the commutation (to achieve longer brush life) is the implementation of the proposal (slotted brush), which provides a linear and a sweet transition of currents in the coils of commutation. Copyright © 2012 John Wiley & Sons, Ltd.