Magnetic drive system for a new centrifugal rotary blood pump


The purpose of this investigation was to design a novel magnetic drive and bearing system for a new centrifugal rotary blood pump (CRBP). The drive system consists of two components: (i) permanent magnets within the impeller of the CRBP; and (ii) the driving electromagnets. Orientation of the magnets varies from axial through to 60° included out-lean (conical configuration). Permanent magnets replace the electromagnet drive to allow easier characterization. The performance characteristics tested were the axial force of attraction between the stator and rotor at angles of rotational alignment, Ø, and the corresponding torque at those angles. The drive components were tested for various magnetic cone angles, ?. The test was repeated for three backing conditions: (i) non-backed; (ii) steel-cupped; and (iii) steel plate back-iron, performed on an Instron tensile testing machine. Experimental results were expanded upon through finite element and boundary element analysis (BEM). The force/torque characteristics were maximal for a 12-magnet configuration at 0° cone angle with steel-back iron (axial force = 60 N, torque = 0.375 Nm). BEM showed how introducing a cone angle increases the radial restoring force threefold while not compromising axial bearing force. Magnets in the drive system may be orientated not only to provide adequate coupling to drive the CRBP, but to provide significant axial and radial bearing forces capable of withstanding over 100 m/s2 shock excitation on the impeller. Although the 12 magnet 0° (?) configuration yielded the greatest force/torque characteristic, this was seen as potentially unattractive as this magnetic cone angle yielded poor radial restoring force characteristics.

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Divisions: College of Health & Life Sciences > School of Biosciences
College of Health & Life Sciences > Chronic and Communicable Conditions
College of Health & Life Sciences
College of Engineering & Physical Sciences > School of Engineering and Technology > Mechanical, Biomedical & Design
College of Engineering & Physical Sciences > School of Infrastructure and Sustainable Engineering > Engineering Systems and Supply Chain Management
College of Engineering & Physical Sciences
College of Engineering & Physical Sciences > Sustainable environment research group
Additional Information: Wiley Periodicals, Inc. © 2008, Copyright the Authors Journal compilation © 2008, International Center for Artificial Organs and Transplantation andWiley Periodicals, Inc. The definitive version is available at 15th Congress of the International Society for Rotary Blood Pumps, Sydney (AU), 2-4 November 2007.
Uncontrolled Keywords: magnetics,prostheses and orthotics,rotary blood pump,Biomaterials,Biomedical Engineering,Bioengineering,Medicine (miscellaneous)
Publication ISSN: 1525-1594
Last Modified: 03 Jan 2024 17:07
Date Deposited: 02 Aug 2010 12:23
Full Text Link: ... 477409/abstract
Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2008-10-22
Authors: Hilton, Andrew (ORCID Profile 0000-0001-8025-5270)
Tansley, Geoff D.


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