Hybrid magnetically suspended and rotated centrifugal pumping ap

Details Hybrid magnetically suspended and rotated centrifugal pumping ap Hybrid magnetically suspended and rotated centrifugal pumping ap

1997-05-02

2000-06-13

Freay, Charles G.

Pumps

Motor driven

Pump within rotary working member

4174237, 417420, 415900, F04B 1700

Patent

active

060741805

ABSTRACT:
An apparatus and method for a centrifugal fluid pump for pumping sensitive biological fluids, which includes (i) an integral impeller and rotor which is entirely supported by an integral combination of permanent magnets and electromagnetic bearings and rotated by an integral motor, (ii) a pump housing and arcuate passages for fluid flow and containment, (iii) a brushless driving motor embedded and integral with the pump housing, (iv) a power supply, and (v) specific electronic sensing of impeller position, velocity or acceleration using a self-sensing method and physiological control algorithm for motor speed and pump performance based upon input from the electromagnetic bearing currents and motor back emf--all fitly joined together to provide efficient, durable and low maintenance pump operation. A specially designed impeller and pump housing provide the mechanism for transport and delivery of fluid through the pump to a pump output port with reduced fluid turbulence.

REFERENCES:
patent: 4688998 (1987-08-01), Olsen et al.
patent: 5044897 (1991-09-01), Dorman
patent: 5055005 (1991-10-01), Kletschka
patent: 5112202 (1992-05-01), Oshima et al.
patent: 5195877 (1993-03-01), Kletschka
patent: 5685700 (1997-11-01), Izraelev
patent: 5840070 (1998-11-01), Wampler

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