Mathematical Modeling State Analysis of Multifunctional Energy Converters with a Solid Rotor

Abstract

Multifunctional energy converters (MFEC) are induction motors with an external hollow solid rotor. Structurally, the MFEC is an electric machine in which the stator has the appearance of a conventional winding rotor and is located in a steel tube, which performs the functions of the rotor. In normal use for an electric motor, this design is inefficient due to significant losses in the solid rotor due to eddy currents. In the case of the MFEC, all losses go to the heating of the loose material that moves along the surface of the solid rotor, so the efficiency of the MFEC is very high. The non-standard design of the MFEC raises a number of questions regarding the calculation of such an electric machine and the mathematical modeling of transient modes: start-up in idle mode, start-up under load, operation during long-term parking under current, random load change during operation, etc. The complexity is caused by taking into account the given parameters of the solid rotor during the change of slip and currents. On the one hand, the currents in the rotor affect the parameters of the solid rotor, on the other hand, these currents cannot be calculated without determining the parameters of the rotor. In this regard, this paper aims to reveal problematic issues in mathematical modeling of transient modes of MFEC with a solid rotor and create a basis for further research in this direction.