Abstract
The purpose of the work is to study and to develop methods of indirect thermal protection of asynchronous electric motors with a squirrel-cage rotor, taking into account the processes of heat release and heat removal. The existing systems of indirect protection of an asynchronous electric motor against overtemperature are considered based on the observer model of stator windings resistance for electric motors. The requirements for an indirect protection system have been developed. The types of electric motors for simulation experiments have been determined. A simulation model has been developed to determine the electrodynamic characteristics. The accuracy of the observer has been analyzed. A block diagram of a protection system against exceeding the maximum permissible temperature of the stator windings of an asynchronous electric motor has been developed