Abstract <p>This article is devoted to the numerical modeling of induction electric motors with a frequency converter. The possibilities of finite element modeling of the electromagnetic field within the electric-motor volume are examined, where current values in the stator and rotor windings and electromagnetic forces are calculated simultaneously with the field, and rotor rotations are determined based on these forces and the motor load. The proposed approaches are implemented in a software system that essentially creates a digital twin of the electric machine, making it possible not only to improve its design, but also to take into account the magnitude and waveform of the voltage supplied to the motor. Two designs of induction motors with different power ratings featuring single and double squirrel-cage rotors are examined as examples. Motor-operation simulation has been performed under various load conditions and different starting modes: with constant and variable frequency. The high accuracy of the calculations is confirmed by comparison with experimental data in steady-state modes following acceleration. The presented software system will make it possible to simulate various induction-motor designs and, based on the simulation results, select the most suitable electric machines and their control modes in order to minimize losses and starting currents depending on the technical operating conditions of the electric drive: load requirements, acceleration time, etc.</p>