Overload protection device for electric motors and method for overload protection of electric motors

摘要

a u00fcberlastsicherung for electric motors has a rotorpositionssensor (10), together with a drehzahlbestimmungs facility (20), a sensor is formed. the drehzahlbestimmungs facility (20) is connected with a energiebegrenzer (24).the energiebegrenzer (24) which is, for example, a pulsweitenmodulations generator action can occur especially in a start-up period to limit the power to reach a referenzdrehzahl. this is a thermal damage of the electric motor is prevented.