A hybrid passive/active magnetic bearing system was designed for a rotary centrifugal blood pump being developed for long-term circulatory support for heart failure patients. This system consists of two axially spaced bearing combinations for complete magnetic levitation of the rotor using only a single-axis active control. Each bearing combination comprises a pair of axially oppositely polarized permanent magnet rings on the rotor and a similar pair in the stator housing for both radial support and axial bias flux, and an electromagnetic coil to actively control the rotor axial position. The design permits a relatively large radial clearance between rotor and stator, and provides sufficient radial/axial stiffness, active controllability over the desired axial travel of the rotor. The bearing characteristics were evaluated by electromagnetic finite element analysis. The prototype pump was fabricated and levitated using a PID controller with zero-force balance algorithm to stabilize the rotor in the thrust direction and minimize the power draw. The experimental results confirmed the efficacy of the proposed magnetic bearing design and associated control algorithm.
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ASME/STLE 2007 International Joint Tribology Conference
October 22–24, 2007
San Diego, California, USA
Conference Sponsors:
- Tribology Division
ISBN:
0-7918-4810-8
PROCEEDINGS PAPER
Hybrid Magnetic Bearings for a Centrifugal Blood Pump Available to Purchase
Zhaohui Ren,
Zhaohui Ren
Mohawk Innovative Technology, Inc., Albany, NY
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Said Jahanmir,
Said Jahanmir
Mohawk Innovative Technology, Inc., Albany, NY
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Hooshang Heshmat,
Hooshang Heshmat
Mohawk Innovative Technology, Inc., Albany, NY
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James Walton
James Walton
Mohawk Innovative Technology, Inc., Albany, NY
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Zhaohui Ren
Mohawk Innovative Technology, Inc., Albany, NY
Said Jahanmir
Mohawk Innovative Technology, Inc., Albany, NY
Hooshang Heshmat
Mohawk Innovative Technology, Inc., Albany, NY
James Walton
Mohawk Innovative Technology, Inc., Albany, NY
Paper No:
IJTC2007-44199, pp. 997-999; 3 pages
Published Online:
March 23, 2009
Citation
Ren, Z, Jahanmir, S, Heshmat, H, & Walton, J. "Hybrid Magnetic Bearings for a Centrifugal Blood Pump." Proceedings of the ASME/STLE 2007 International Joint Tribology Conference. ASME/STLE 2007 International Joint Tribology Conference, Parts A and B. San Diego, California, USA. October 22–24, 2007. pp. 997-999. ASME. https://doi.org/10.1115/IJTC2007-44199
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