Herborn & Breitenbach Gmbh & Co. Kg

Maschinenfabrik Stahlkontor Weserlenze Gmbh & Co.

Gustav Matthies

Wolf-Dieter Fink

Manfred Tinebor

Heinz-Dietmar Karl

A process for controlling a multiple stage drawing machine that implements a direct non-sliding drawing process provides for set-up and production to be automatic and for the variables necessary for process control, especially material speed and applied force, to be derived without establishing contact between the stock material and a sensing device.

Drawing process control method

A method and circuit for regulating an alternate or three-phase current motor, a pulse inverter with a capacitive direct current intermediate circuit is used through which the motor is supplied with a substantially constant voltage by means of electronic switches and corresponding antiparallel recovery diodes. For this purpose, the reactive motor current is measured for utilization in the feedback control system. To this end, the feedback current from the motor inductance to the capacitor of the intermediate circuit is measured and the value obtained is used to form a control signal for regulating the reactive current.

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Barntrup, Germany

Gustav Matthies