Electrical supply unit for a short-path installation, operating at high speed, for the soft-annealing of wires by electrical contact

摘要

The invention relates to a supply unit for an installation, which operates at high speed and is designed with a short path, for the soft-annealing of metal wires by electrical contact following the drawing process, in which installation the wire is guided between contact rollers through the annealing zone of the installation, and the contact rollers are connected to the output of a rectifier. The essential feature of the invention is that the output of the rectifier (2) is connected via a chopper (3) to the contact rollers (42, 43), and furthermore the one input of a pulse-width modulator (6) is connected to the output of a pulse generator (5), the other input being connected to the output of a regulator (10). The output of a unit (9) which produces the desired value is connected to the one input of the regulator (10) and the output of a unit (12) which produces the actual value is connected to the other input; furthermore, the input of the unit (12) which produces the actual value is connected to the output of the chopper (3), and the output of the pulse-width modulator (6) is connected via a potential isolator (7) and a drive unit (8) to the control input of the chopper (3). <IMAGE>