Impeller position compensation using field oriented control
US9709061B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 3, 2016 |
| Grant date | Jul 18, 2017 |
| Priority date | — |
| Expiry date | Jun 3, 2036 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2205/3507
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A centrifugal pump system having an impeller rotating with first and second magnetic structures on opposite surfaces. A levitation magnetic structure is disposed at a first end of a pump housing having a levitating magnetic field for axially attracting the first magnetic structure. A multiphase magnetic stator at a second end of the pump housing generates a rotating magnetic field for axially and rotationally attracting the second magnetic structure. A commutator circuit provides a plurality of phase voltages to the stator. A sensing circuit determines respective phase currents. A controller calculates successive commanded values for the phase voltages in response to the determined phase currents and a variable commutation angle. The angle is selected to correspond to an axial attractive force of the stator that maintains a levitation of the impeller at a centered position within the pumping chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.