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. 21, 2009
Filed:
Feb. 28, 2007
Xiaojun Zhang, Peoria, IL (US);
Timothy Lynn Cooper, Metamora, IL (US);
James Ivan Portscheller, Sparland, IL (US);
Naga Raja Rao Mosam, Peoria, IL (US);
Michael Lee Ferguson, Jr., Peoria, IL (US);
Xiaojun Zhang, Peoria, IL (US);
Timothy Lynn Cooper, Metamora, IL (US);
James Ivan Portscheller, Sparland, IL (US);
Naga Raja Rao Mosam, Peoria, IL (US);
Michael Lee Ferguson, Jr., Peoria, IL (US);
Caterpillar Inc., Peoria, IL (US);
Abstract
A method for protecting against current overload conditions associated with an electromagnetic lift system comprises receiving current data from a current monitoring device associated with an electromagnetic lift system. The method also includes determining a current level based on the collected current data, and identifying a predetermined overload range corresponding to the current level if the current level exceeds an overload current threshold. The method also includes monitoring a time that the current level is within the predetermined overload range, and providing a command signal to an actuator associated with the electromagnetic lift system if the time that the current level is within the predetermined overload range exceeds a predetermined time limit. The command signal causes the actuator to substantially limit mechanical power provided to a generator associated with the electromagnetic lift system.