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Magnetic bearings for mechanical cardiac assist devices

Author: Steven Day; Shanbao Cheng; Arnold David Gomez
Publisher: New York, NY : ASME Press, [2015]
Series: Biomedical & nanomedical technologies.
Edition/Format:   eBook : Document : EnglishView all editions and formats
Summary:
Magnetic bearings are mechatronic devices that produce contact-free electromagnetic force to support a load, such as a moving train or a spinning rotor. Compared to traditional bearings, magnetic bearings offer several advantages: no friction, low heat generation, no required lubrication, quiet operation, and fast and stable rotation. Because of these reasons, magnetic bearings have been used in rotary ventricular  Read more...
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Genre/Form: Electronic books
Additional Physical Format: Print version:
Day, Steven (Steven W.).
Magnetic bearings for mechanical cardiac assist devices.
New York, NY : ASME Press, [2015]
(DLC) 2015037208
(OCoLC)923793908
Material Type: Document, Internet resource
Document Type: Internet Resource, Computer File
All Authors / Contributors: Steven Day; Shanbao Cheng; Arnold David Gomez
ISBN: 9781606509203 1606509209
OCLC Number: 936210036
Notes: Co-published with American Society of Mechanical Engineers.
Description: 1 online resource (viii, 57 pages) : illustrations.
Contents: 1. Magnetic bearings for assist devices --
1.1 Fundamentals of magnetic bearings --
1.1.1 Considerations of a full magnetic suspension --
1.1.2 Active magnetic bearing (AMB). 2. Structure of magnetic actuator --
2.1 Properties of magnetic materials --
2.2 Passive actuators --
2.2.1 Typical passive configuration (radial passive bearing) --
2.3 Active actuators --
2.3.1 Typical radial --
2.3.2 Flux biased magnetic bearings --
2.4 Typical configuration of hybrid actuators --
2.5 Electromagnetic coils --
2.6 System configurations --
2.6.1 Centrifugal vs. axial-flow configurations --
2.6.2 Hydrodynamically assisted suspension --
2.6.3 Motor assisted suspension. 3. Position sensors --
3.1 Eddy current sensors --
3.2 Inductance based sensors --
3.3 Hall effect sensors --
3.4 Optical sensors --
3.5 Capacitive sensors --
3.6 Self-sensing magnetic bearings. 4. Controller and electronics design --
4.1 Design principle of one-axis suspension --
4.2 Control laws --
4.2.1 Proportional, integral, and derivative (PID) --
4.2.2 Advanced control laws --
4.3 Hardware --
4.3.1 Analog-to-digital conversion and data acquisition --
4.3.2 Processor --
4.3.3 Power amplifier. 5. Performance considerations of magnetic bearings in VADs --
5.1 System complexity --
5.2 Weight and size --
5.3 Power consumption --
5.4 Physical disturbance rejection --
5.5 Reliability and durability --
5.5.1 Sensor failure --
5.5.2 Wire and coil failure --
5.5.3 Controller durability --
5.6 Failure remediating measures --
5.6.1 Manufacturing --
5.6.2 Physical redundancy of components sensors and wires --
5.6.3 Fault tolerant control --
5.6.4 Touch-down bearings. 6. Specific device examples --
6.1 Berlin Heart InCOR --
6.2 Terumo Duraheart --
6.3 WorldHeart Levacor --
6.4 PediaFlow --
6.5 WorldHeart MiFlow VAD --
6.6 Heartware HVAD and mVAD --
6.7 LEV-VAD --
6.8 MitiHeart. Conclusion.
Series Title: Biomedical & nanomedical technologies.
Other Titles: Magnetic bearings assist devices
Responsibility: Steven Day, Shanbao Cheng, Arnold David Gomez.

Abstract:

According to the American Heart Association, approximately 5 million Americans have congestive heart failure (CHF) and more than half a million new cases are reported every year. It is estimated that  Read more...

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