Mill train having at least one roll stand with an AC drive syste

Details Mill train having at least one roll stand with an AC drive syste Mill train having at least one roll stand with an AC drive syste

1997-02-25

1999-01-19

Hail, III, Joseph J.

Metal deforming

By use of roller or roller-like tool-element

With carrier for roller-couple or tool-couple

72 291, B21B 3514

Patent

active

058603107

ABSTRACT:
A mill train comprising: at least one roll stand for rolling rolling stock; at least one AC motor operatively coupled to the roll stand to drive same; and a controller for controlling the motor, wherein the motor speed is adjustable between a minimum speed (n.sub.min) and a maximum speed (n.sub.max); wherein the ratio of the maximum speed (n.sub.max) to the minimum speed (n.sub.min) lies within the range 2.0 and 8.0; and wherein the motor has a power output between the minimum speed (n.sub.min) and the maximum speed (n.sub.max) that deviates from the continuous output of the motor at the minimum speed.

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patent: 5298848 (1994-03-01), Ueda et al.
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patent: 5649441 (1997-07-01), Granholm et al.
patent: 5664205 (1997-09-01), Nguyen Phuoc et al.
AC Drive System in Cold Mill Train, K. Yamamoto, Iron and Steel Engineer, May, 1989.
Experience With AC Cycloconverters for High Horsepower Drive Mills, O. Hauch, Iron and Steel Engineer, Sep, 1989.
W.T. Lankford, Jr., et al., The Making and Treating of Steel, U.S. Steel, Section 4, pp. 812-839, 10th Edition (1985).
T. Sukagawa, et al., Recent Microprocessor-Based Control for Motor Drives, Hitachi Review, vol.34, No. 4 pp. 187-193 (1995).
H. Klautschek, Grundiagen und Begriffe der Unrichtertechnik sowle der aligemeinen Drehfeldmaschine, presented at the Fort-und Weiterbildungszentrum of the Technische Akademie, Esslingen, pp. 1-5 (1984).

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