Nowadays, design of electrical motors runs up more and more against the problems of heatings during operation. These excessive heatings result from a weak heat dissipation. The improvement of cooling system passes thought the improvement of convective heat transfers within the motors. However, these heat transfers strongly depend on the flow structure. This structure is particularly significant for the enclosed motors. The air is completely enclosed inside the machine and consequently, it is never renewed. Indeed, for this kind of configuration, the flow structure is only regulated by the geometry. It is thus not possible to modify it from the outside as for the open motors. That is why, the numerical study presented below analyzes the flow structure in an enclosed induction motor of railway traction. The sliding mesh method has been carried out in order to keep a significant accuracy on the flow nature. Then, some air spaces in the motor have been proved to be particularly sensitive for this kind of enclosed motor.

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