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The interest in electric traction has reached a very high level in recent decades; there is no doubt that electric vehicles have become among the main means of transport and will be the first choice in the future, but to dominate the market, a lot of research efforts are still devoted to this purpose. Electric machines are crucial components of electric vehicle powertrains. The bulk of traction drive systems have converged in recent years toward having some sort of permanent magnet machines because there is a growing trend toward enhancing the power density and efficiency of traction machines, resulting in unique designs and refinements to fundamental machine topologies, as well as the introduction of new machine classes. This paper presents the technological aspect of the different components of the electric powertrain and highlights the important information on the electric vehicle’s architecture. It focuses on a multi-criteria comparison of different electric motors utilized in the electric traction system to give a clear vision to allow choosing the adequate electrical motor for the desired application. The proposed comparative analysis shows that the induction motor better meets the major necessities of the electric powertrain, whereas the permanent magnet synchronous motor is nonetheless the most used by electric vehicle manufacturers.

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This paper presents a general analytical model of the lamination. The design of high speed machines with for the design of high-speed slotless permanent magnet SMC stator cores is a complex problem because a precise brushless motors equipped with surface-mounted magnets and knowledge of the eddy currents circulation and their effects using soft magnetic composite material (SMC) in the stator. that is closely related to the machine structure, dimensions The electromagnetic model is formulated in polar coordinates . and based on the prediction of the two-dimensional magnetic and supply, iS essential. field distribution in the magnets/air-gap/windings/stator core This paper presents a first approach to a specific design regions, produced by the magnets and the stator currents methodology of this kind of machines equipped with surface windings. It takes into account the effects of the stator core mounted magnets. A design tool has been developed that eddy currents induced in the massive homogeneous SMC takes into account the effects of the stator core eddy currents material. Different machine performances like the instantaneous torque under brushless operation and the total iduced in the massive homogeneous SMC material. It is magnetic losses are evaluated. The analytical design model is using an analytical model based on the prediction of the validated by FE analysis in terms of magnetic field distribution two-dimensional magnetic field distribution in the machine and total stator core loss. The influence of the stator yoke structure, due to the magnets and the armature currents. The thickness and the SMC material conductivity on the motor model is formulated in polar coordinates and it takes performances is investigated. Experimental results are given account of the effect of the eddy current reaction field and for the stator magnetic losses. the time and space harmonics of the magnetic field. Index Terms-Permanent magnet machines, slotless, high Different machine performances like the instantaneous speed, magnetic field, model, design, losses, eddy currents, torque under brushless operation and the total magnetic SMC.losses are evaluated. The developed model is validated by FE analysis and employed to investigate the influence of the stator yoke thickness and the SMC conductivity on the