S.MabrakS. ChakrouneD. Khodja2021-09-062021-09-062021http://dspace.univ-msila.dz:8080//xmlui/handle/123456789/25409In this paper, first of all the motor performance created by permanent magnetic in a slot less air-gap of a surface mounted permanent-magnet synchronous motor with non magnetic rotor and either sinusoidal or mixed (quasi-Halbatch) magnetization using polar coordinates is presented. After that the analysis works for both internal and external rotor motor topologies, the effect of stator slots is introduced by modulating the magnetic field distribution in the less slot stator by the complex relative air-gap permeances and the conformal transformation of the slot geometry. Finally, the predicted results of flux density distribution and cogging torque with those obtained by finite-element are analyzed.magnetic field, permanent-magnet, air-cored, finite element, cogging torqueArticle