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. 30, 2019
Filed:
Mar. 28, 2018
Grundfos Holding A/s, Bjerringbro, DK;
Klaus Vestergaard Kragelund, Risskov, DK;
Jan Plougmann, Bjerringbro, DK;
Jan Carøe Aarestrup, Bjerringbro, DK;
GRUNDFOS HOLDING A/S, Bjerringbro, DK;
Abstract
A pump assembly () includes a pump unit () capable of providing a desired head (H) at zero flow rate, a brushless speed-controlled permanent-magnet AC drive motor () for driving the pump unit (), and a control unit for controlling the drive motor (). The control unit includes a frequency converter configured to receive an input voltage (U). The drive motor () is operable in a field-weakening mode and non-field-weakening mode. The drive motor () is undersized for driving the pump unit () at a design input voltage (U) to provide a lower head (H) than the desired head (H) at zero flow rate in the non-field-weakening mode and for driving the pump unit () to provide the desired head (H) at zero flow rate in the field-weakening mode.