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:
Mar. 28, 2006
Filed:
Jun. 03, 2004
Roger Alan Plemmons, Asheville, NC (US);
John Herman Blakely, Weaverville, NC (US);
Gregory A. Helton, Asheville, NC (US);
Mark E. Innes, Asheville, NC (US);
Ricky A. Hurley, Hendersonville, NC (US);
Roger Alan Plemmons, Asheville, NC (US);
John Herman Blakely, Weaverville, NC (US);
Gregory A. Helton, Asheville, NC (US);
Mark E. Innes, Asheville, NC (US);
Ricky A. Hurley, Hendersonville, NC (US);
Rockwell Automation Technologies, Inc., Mayfield Heights, OH (US);
Abstract
A technique is provided for controlling and protecting loads such as electric motors. In the technique, current sensing circuitry detects electrical current applied to the load. Device thermal modeling circuitry, such as circuitry for modeling heating of a motor, determines heating based upon the sensed current, and generates a first trip signal in a first range based upon the current. Conductor thermal modeling circuitry estimates heating of conductors that supply current to the load, and generates a second trip signal in a second range based upon the conductor heating. The system provides an extended range of operation for a wide range of loads by effectively modeling conventional thermal overload and instantaneous trip devices.