Showing papers by "Georges Barakat published in 2003"
01 Jun 2003
TL;DR: In this paper, a quasi-three-dimensional analytical model of the magnetic field in an axial flux permanent magnet synchronous machine (AFPMSM) is presented, which is derived from an exact 2D analytical solution of magnetic field extended to the 3D case by a simple and effective radial dependence modeling.
Abstract: A quasi-three-dimensional (3D) analytical model of the magnetic field in an axial flux permanent magnet synchronous machine (AFPMSM) is presented. This model is derived from an exact 2D analytical solution of magnetic field extended to the 3D case by a simple and effective radial dependence modeling of the magnetic field. The obtained quasi-3D solution allows rapid parametric studies of airgap magnetic field. Then, an analytical modeling of the cogging torque is presented. It is based on the obtained quasi-3D analytical solution. Results issued from the proposed model in the airgap are compared with those stemming from a 3D finite elements method (FEM) simulation as well as with prototype measured values.
32 citations
TL;DR: An accurate transient model of squirrel cage induction machines under stator faults is presented here and a coupled magnetic circuits approach is used and very few restrictive assumptions are made.
30 citations
01 Jun 2003
TL;DR: In this paper, the authors deal with a global method enabling the simulation of the squirrel cage induction machines under rotor and stator faults, which is based on the coupled magnetic circuit theory.
Abstract: This paper deals with a global method enabling the simulation of the squirrel cage induction machines under rotor and stator faults. This method is based on the coupled magnetic circuit theory. The system of differential equations describing the induction machine in presence of different rotor and stator faults is given. The machine inductances are calculated by means of the magnetic energy stored in the airgap. This task is performed by the use of the winding function method and a previously developed airgap permeance analytical model. Because of the inductances calculation is highly time consuming, a numerical representation method of the inductances is also proposed avoiding the calculation of the inductances during the differential equations system integration. The proposed model allows a precise study of several machine faults signature in various machine main quantities. Finally, some simulation results illustrate the proposed global method in the case of some common defaults such as stator inter-turn short circuits, broken rotor bars, broken end rings or airgap eccentricity.
27 citations