3D printing technologies for large-scale structures allow architects and builders to considerably expand the design boundaries of structures and increase the efficiency of their construction. Mobile robotic platforms for 3D printing are increasingly being implemented in the construction sector, as well as in the production of road surfaces, allowing to solve the problem of limited working space. The typical design of the extruder assembly of a robotic platform for 3D printing large-scale structures can be improved by combining an electric motor, an auger extruder, and a heater in one housing. The proposed auger-type electrothermomechanical converter uses an external auger rotor, which simultaneously performs the functions of an asynchronous motor rotor, a heating element, an actuator, and a protective housing. The purpose of this study was to evaluate the efficiency of using an auger converter as part of a mobile robotic platform for additive manufacturing. For converters operating in difficult conditions, the use of field calculation methods is relevant. In this study, a field calculation was performed using the finite element method and the spatial distribution of eddy currents in the section of the hollow ferromagnetic rotor was found. Pictures of the three-dimensional distribution of the z-component, the normal component of the density of eddy currents, as well as the distribution of the dissipated power density, which considers all types of losses in the rotor, were obtained using the Comsol Multiphysics software and computing complex. The practical value of the obtained results lies in the possibility of predicting optimal indicators of the influence of the thermal regime on the material, as well as the speed of rotation of the converter rotor. This will determine the mechanical properties of the material at the output of the device.
