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- A. M. El-Serafi, Jinglong Wu
- IEEE Power Engineering Review
- 1991

- A. M. El-Serafi, N. C. A. van der Kar
- IEEE Transactions on Energy Conversion
- 2005

In the analysis of the steady-state performances of saturated synchronous machines using the classical two-axis (d- and q-axis) frame model, the accurate calculation of the machine performancesâ€¦ (More)

- Xiaodong Liang, A. M. El-Serafi, S. O. Faried
- IEEE Transactions on Energy Conversion
- 2010

It has been recognized that the cross-magnetizing phenomenon of saturated synchronous machines plays an important role in their analysis using the two-axis frame models. In this paper, theâ€¦ (More)

- A. M. El-Serafi, N. C. A. van der Kar
- IEEE Power Engineering Review
- 2002

For the accurate analysis of salient-pole synchronous machines using the two-axis frame models, the direct-axis (d-axis) and quadrature-axis (q-axis) saturation characteristics are needed. Usuallyâ€¦ (More)

- A. M. El-Serafi, S. A. Shehata
- IEEE Transactions on Power Apparatus and Systems
- 1976

This paper describes a mathematical model for the simulation of an AC/DC system using direct-phase quantities. This system consists of an AC/DC converter station connected to a synchronous generatorâ€¦ (More)

- H. Moussa, M. A. Badr, A. M. El-Serafi
- IEEE Power Engineering Review
- 1985

The addition of a properly controlled q-ais field winding on the rotor of a synchronous generator has been suggested before as an effective way of improving power systemn steady-state and transientâ€¦ (More)

- N. C. A. van der Kar, A. M. El-Serafi
- Canadian Conference on Electrical and Computerâ€¦
- 2004

The d-axis saturation characteristic of a synchronous machine can be measured easily by the conventional open-circuit test with the machine excited from its field winding. On the other hand, theâ€¦ (More)

- Muhammad S. Morsy, H. H. Amer, M. A. Badr, A. M. El-Serafi
- IEEE Power Engineering Review
- 1983

Investigations have indicated the possibility of operating two-axis synchronous generators (a machine which has two identical field windings: one on the d-axis and the other on the q-axis)â€¦ (More)

- A. M. El-Serafi, N. C. A. van der Kar
- 2008 18th International Conference on Electricalâ€¦
- 2008

In this paper, the effect of voltage sag duration on the analysis of the air-gap magnetic flux patterns and the largest post-sag peak electromagnetic torques in saturated synchronous motors isâ€¦ (More)

- M. K. El-Sherbiny, A. M. El-Serafi
- IEEE Power Engineering Review
- 1982

A mathematical analysis is developed to include the saturation in the small-perturbation equations of synchronous machines. The saturation in both the d-and q-axis has been considered. Using thisâ€¦ (More)