Structure design of the active part of the electric machine of the traction motor of unmanned aerial vehicles

The article describes the process of designing the active part of a traction electric machine for unmanned aerial vehicles and evaluating its mass-geometric and electrical parameters. The purpose of the work is to increase the specific power of the electric motor by reducing its mass when replacing electrical copper for armature windings with electrical aluminum without increasing the overall dimensions of the structure. In the section “Description of the design under development” a draft design of the active part of the traction electric machine is given. As a traction motor, a three-phase valve electric drive is used, which belongs to the class of brushless DC motors. High requirements are also imposed on the parameters of the designed active part of the electric machine. The section “Calculation of the design model” provides methods for calculating the geometric characteristics and electromagnetic parameters of the designed traction motor structure, and their mathematical description. The sections “Design project” and “Main results” present the results of calculations for two design options - with a copper winding and with an aluminum winding, the materials of the components are selected, the methods of manufacturing some components, as well as the main methods by which these designs were finalized. As a result of the work, the effect of reducing the mass of the designed structure by 1.16 times was achieved without increasing the overall dimensions while maintaining the efficiency value above 90 % and maintaining the net power value of 2.6 kW. Also, studies were carried out on the total electrical losses of structures with the same winding resistance and operating current, which turned out to be different.