Patent ID: 9371826
Filing Date: 2016-06-21
CPC Classification: A61M,F04B,F04D,H02P

Claim Text:
1. A centrifugal pump system comprising: a disc-shaped impeller rotating about an axis and having a first magnetic structure disposed at a first surface and a second magnetic structure disposed at a second surface; a pump housing defining a pumping chamber which receives the impeller; a levitation magnetic structure disposed at a first end of the pump housing having a levitating magnetic field for axially attracting the first magnetic structure; a multiphase magnetic stator disposed at a second end of the pump housing for generating a rotating magnetic field for axially and rotationally attracting the second magnetic structure; a commutator circuit for providing a plurality of phase voltages to the stator; a sensing circuit determining respective phase currents flowing in response to the phase voltages; and a controller configured to: