Optimisation of the Rotor Speed as a way to Improve Specific Indicators of Traction Electric Motors

The issue of ensuring performance with a minimum mass of electrical machines is a task for designing traction electric motors. This article discusses ways to increase the flux linkage and one of the most effective ways is to increase the flux linkage by increasing the rotational speed, since, unlike other methods, this method does not increase the phase resistance and, accordingly, the energy loss in the winding. The main energy losses in an electric machine and the influence of the rotor speed on energy losses are also analysed. Therefore, knowing the losses in the electric machine, the efficiency of the electric machine was calculated. As a result of the study, it was revealed that an increase in the rotational speed leads to a decrease in mass and dimensions, but to a decrease in the efficiency of an electric machine. The optimal values of the rotational speed must be determined for each electric machine, thereby ensuring high efficiency, minimum weight and dimensions, as well as providing the necessary traction and dynamic performance.