The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 19, 1999
Filed:
Feb. 25, 1997
Applicant:
Inventor:
Johann Thomas Wokusch, Forchheim, DE;
Assignee:
Siemens Aktiengesellschaft, Munich, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B21B / ;
U.S. Cl.
CPC ...
72249 ; 72 291 ;
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.