Pumps – Processes
Patent
1998-05-06
2000-04-25
Capossela, Ronald
Pumps
Processes
417356, 41742312, F04B 3504
Patent
active
060537051
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a rotary pump according to the preamble of claim 1 as well as to a method for operation thereof according to the preamble of claim 22.
Known rotary pumps, for example axial pumps or centrifugal pumps have a rotor that is rotatably mounted in mechanical bearing devices. Rotary pumps of this type suffer from the disadvantage that the delivered fluid is contaminated by lubricants or mechanical abrasion of the bearing devices or of the rotor, so that such pumps are not suitable for delivering fluids that must not be contaminated. Fluids of this kind include for example super-pure water or blood. In addition, such rotary pumps are not suitable for delivering aggressive fluids, since the bearing devices would be destroyed in a short time.
The goal of the present invention is to propose an economically more advantageous rotary pump.
This goal is achieved by a rotary pump having a bearingless motor. The rotary pump includes a housing defining an inlet, an outlet, and a passage extending between the inlet and the outlet for enabling a fluid to be pumped from the inlet to the outlet. A stator is arranged to extend around the housing defining the passage. This stator has a plurality of magnetically conducting stator teeth wound with electrical windings. A rotor with fluid impelling blades is contained inside the housing at the passage for rotating around an axis within the passage. This rotation causes fluid to be pumped from the inlet to the outlet of the housing. A passive magnetically effective rotor part is comprised by the rotor. An electrical control is provided to the electrical windings to generate a rotating magnetic field for causing rotation of the rotor. This same electrical control controls the magnetic field to position the passive magnetically effective rotor part relative to the stator in a plane normal to the axis. At the same time, the passive magnetically effective rotor part has a passive magnetic attraction to the magnetically conducting teeth of the stator to resist rotor displacement along the axis and to resist tilting of the rotor relative to a plane normal to the axis. The electrical driving of the pump can be inductive, reluctance or synchronous. Further, the following discloses a process for the control of a rotary pump. For example, the pump has a use in the pumping of blood, either inside or outside the human body.
The goal is achieved by a rotary pump with a rotor that is mounted and drivable with zero contact by magnetically acting forces inside a housing of the rotary pump. One advantage of the invention consists in the fact that the housing permits hermetic separation between the electromagnets that are controllable and are located outside the housing and the fluid flowing inside the housing. There are no openings whatever in the housing. In addition, the rotor is mounted with zero contact inside the housing, so that no lubricants are required and there is no abrasion by bearing devices.
The invention is achieved in particular by a rotary pump comprising a housing and an impeller with a rotational axis located inside the housing, with the impeller having a passive magnetically effective rotor part and the housing being surrounded by a stator that has electrical coils and teeth, said coils and teeth being arranged, designed, and controllable in such fashion that the stator and the rotor part cooperate as a bearingless motor.
The use of a bearingless motor makes the rotor part actively controllable in three degrees of freedom and allows the position of the rotor part to be defined in a plane running perpendicularly to the rotation axis in the x and y directions and a torque that acts in the circumferential direction on the rotor part can also be predetermined by a corresponding control of the electrical coils.
In an especially advantageous embodiment of the invention, the rotor part and the teeth of the stator are designed with geometric mutual adaptation and arranged relative to one another in such fashion that the rotor part can be held by passively acting re
REFERENCES:
patent: 4779614 (1988-10-01), Moise
patent: 5112200 (1992-05-01), Isaacson
patent: 5385581 (1995-01-01), Bramm
patent: 5470208 (1995-11-01), Kletschka
patent: 5484266 (1996-01-01), Murga
patent: 5507629 (1996-04-01), Jarvik
Bramm, G., et al. "Axial Centrifugal Blood Pump with Magnetically Suspended Rotor", in: Proc. ESAO (1982) Sep. 1-3, Brussels, Belgium.
Hugel Jorg
Schob Reto
Capossela Ronald
Lust Antriebstechnik GmbH
Sulzer Electronics AG
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