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:
Aug. 12, 2014
Filed:
Dec. 01, 2010
Robert W. Stiles, Jr., Cary, NC (US);
Lars Hoffmann Berthelsen, Kolding, DK;
Peter Westermann-rasmussen, Soenderborg, DK;
Gert Kjaer, Soenderborg, DK;
Florin Lungeanu, Egernsund, DK;
Robert W. Stiles, Jr., Cary, NC (US);
Lars Hoffmann Berthelsen, Kolding, DK;
Peter Westermann-Rasmussen, Soenderborg, DK;
Gert Kjaer, Soenderborg, DK;
Florin Lungeanu, Egernsund, DK;
Pentair Water Pool and Spa, Inc., Sanford, NC (US);
Danfoss Low Power Drives A/S, Graasten, DK;
Abstract
Embodiments of the invention provide a pumping system for at least one aquatic application. The pumping system includes a pump, a motor coupled to the pump, and a controller in communication with the motor. The controller determines a first motor speed, obtains a reference flow rate, determines a present flow rate, and determines a present power consumption. The controller calculates a difference value between the reference flow rate and the present flow rate, and uses at least one of integral, proportional, and derivative control to generate a second motor speed based on the difference value. The controller attempts to drive the motor at the second motor speed until reaching a steady state condition.