Circuit arrangement having a controlled rectifier bridge circuit, on which a single-phase or multi-phase voltage acts, and having an invertor which is supplied from said rectifier bridge circuit

摘要

The subject matter of the invention is an invertor circuit to which an induction motor (1) is connected which drives a process machine. The power consumption from the AC network is regulated to a minimum value for the respective load situation. Furthermore, the frequency of the invertor circuit is matched to the load of the process machine in such a manner that a physical variable which is dependent on the rotation speed of the process machine remains constant. <IMAGE>