PROCESS FOR DETERMINING THE LOAD OF AN ASYNCHRONOUS MOTOR FED VIA A FREQUENCY CONVERTER AND A DEVICE FOR CARRYING OUT THE PROCESS

摘要

In an asynchronous motor fed from an AC current network (R; Mp) via a frequency converter (5; 6) and having an electronic control system (2; 3) for controlling the operating voltage as a function of a comparison of a load-specific current signal, which can be detected by the electronic control system (2; 3), with a corresponding control of the asynchronous motor (1) can be achieved with a low electronic expenditure by providing the current decay time (AI) as a load-specific current signal during which time the free-wheeling current following after voltage interruption in a motor winding path decreases by a specific degree.