Patent ID: 6227817
Filing Date: 2001-05-08
Classification: A61M,F04D,F16C

Abstract:
A magnetically-suspended centrifugal pump comprising:a) a housing including an inlet, a volute, and a flow path between said inlet and said volute;b) a hub rotatably disposed within said housing, said hub including a first end and a second end and a hollow cavity between said first end and said second end;c) a first permanent magnet bearing located at said first end of said hub and a second permanent magnet bearing located at said second end of said hub;d) a plurality of impeller blades located within said flow path and between said first end of said hub and said second end of said hub;e) a motor having a circumferential rotor and a circumferential stator, located adjacent to said plurality of impeller blades;f) a sensor sensing an axial position of said hub; andg) a thrust coil for adjusting said axial position of said hub;wherein said first and second permanent magnet bearings passively, radially suspend said hub, said sensor is used to control activation of said thrust coil to maintain said axial position of said hub, and said motor rotates said hub to provide fluid flow through said flow path via said plurality of impeller blades.