This thesis paper deals with the strength comparison of the outer rotor of an electric motor, which is made by deep drawing from different thicknesses of sheet metal. The manufacturer offered us a choice of sheet metal thicknesses of 6 mm and 8 mm. In the first part of the paper, data of the fans driven by such an electric motor are collected. From these data and the specifications of the electric motor, the loads with which the rotor is loaded are calculated. From the obtained results, two critically loaded electric motors of this family were selected. These two motors were analysed in more detail. In the second part of this thesis paper, the calculated loads are taken into account in the Ansys Workbench 19.2 program, where we perform a static structural analysis of selected electric motors. Structural analysis shows the areas of critical stresses and the shape and magnitude of the deformations of the components. The results show that the problem is not in the strength of the rotor, but the critical stresses are concentrated mainly in the welds.
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