A numerical prediction of carter coefficient in a curved air gap

Abstract

The effect of air gap curvature on the Carter coefficient and magnetic field is studied in this article. In the analysis, a finite‐difference successive relaxation technique is employed to solve a dimensionless Maxwell equation. Constant fluxes are applied on a simplified model and the calculated Carter coefficients in the curved air gap are compared with the data in the existing literature. Flux plots, dimensionless radial flux densities in the air gap, and the Carter coefficient with normalized air gap G=0.1 and 0.2, slot numbers N=18, 24 and 36, rotor curvature K=0.24, 0.17 and 0.1, slot depths D=0.4 and 2.0, and half slot width W=0.2 to 0.8 are presented.