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:
Jun. 21, 2016
Filed:
Dec. 10, 2014
Rockwell Automation Technologies, Inc., Mayfield Heights, OH (US);
Thomas Nondahl, Greenfield, WI (US);
Jingbo Liu, Grafton, WI (US);
Peter Schmidt, Franklin, WI (US);
Semyon Royak, Orange Village, OH (US);
Jingya Dai, Kitchener, CA;
Ehsan Al-Nabi, Cambridge, CA;
Rockwell Automation Technologies, Inc., Mayfield Heights, OH (US);
Abstract
Motor drive control apparatus and methods are presented for sensorless control of a driven motor using open loop current regulated control during low-speed operation and an EMF-based position observer for position estimation during higher speed operation, with zero feedback speed during low-speed open-loop operation and feedback speed estimated by the EMF-based observer during high-speed operation and with velocity mode control over the full speed range and mode control hysteresis for smooth transitions between open loop and EMF-based observer control.