Speed control

US8043070B2 · kind B2 · utility

Assignees

• Pentair Water Pool and Spa, Inc. · US
• Danfoss Low Power Drives, a Division of Danfoss · DK

Inventors

• Robert W. Stiles, Jr. · Cary, US
• Lars Hoffmann Berthelsen · Kolding, DK
• Ronald B. Robol · Sanford, US
• Christopher R. Yahnker · Raleigh, US
• Daniel J. Hruby · Sanford, US
• Kevin Murphy · Quartz Hill, US
• Einar Kjartan Runarsson · Dörpen, DE
• Arne Fink Hansen · Sweetgum Street, DK
• Florin Lungeanu · Beijing, CN
• Peter Westermann-Rasmussen · Skanderborg, DK

Key dates

• Filing date: Dec 11, 2006
• Grant date: Oct 25, 2011
• Expiry date: Dec 11, 2026

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T29/49817
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A pumping system for moving water of a swimming pool includes a water pump, an infinitely variable speed motor, and an arrangement for operating the motor. In one example, the pumping system includes a memory configured to store a plurality of retained speed values, an arrangement for providing a plurality of retained speed values to the memory, and an arrangement for reading a selected one of the plurality of retained speed values from the memory. In addition or alternatively, the pumping system includes a storage medium for digitally storing a plurality of pre-established motor speed values and an arrangement for receiving input from a user to select one of the pre-established motor speeds. In addition or alternatively, the pumping system further includes an arrangement for restarting operation of the motor at a previously selected speed value when power supplied to the motor is interrupted during operation of the motor. A method for controlling the pumping system is also provided.