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:
Jul. 02, 2002
Filed:
Jun. 25, 2001
Jon Reynolds, Appleton, WI (US);
Warren E. Herwig, Oshkosh, WI (US);
Illinois Tool Works Inc., Glenview, IL (US);
Abstract
An apparatus and method is disclosed for series inductance-reactance control of a transformer in a welder. The transformer includes a transformer core configured to conduct magnetic flux and at least one primary winding connected to a voltage source that excites the primary windings. Secondary windings, configured to generate secondary voltages and currents for welding, are wound about each of the primary windings and are magnetically coupled to the magnetic flux in the transformer core. The transformer also includes a control core magnetically coupled with a secondary winding, wherein the control core has an inductive reactance in response to the flow of secondary current from the secondary winding. The secondary current is adjustable by varying an air gap between core sections of the control core. A crank mechanism configured to move one of the core sections with respect to the other and vary the distance of the air gap.