High Performance Magnetic Bearings for Aero Applications
High Performance Magnetic Bearings for Aero Applications

Author: National Aeronautics and Space Administration (NASA)

Publisher: Createspace Independent Publishing Platform

Published: 2018-07-05

Total Pages: 38

ISBN-13: 9781722271268

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Several previous annual reports were written and numerous papers published on the topics for this grant. That work is not repeated here in this final report. Only the work completed in the final year of the grant is presented in this final report. This final year effort concentrated on power loss measurements in magnetic bearing rotors. The effect of rotor power losses in magnetic bearings are very important for many applications. In some cases, these losses must be minimized to maximize the length of time the rotating machine can operate on a fixed energy or power supply. Examples include aircraft gas turbine engines, space devices, or energy storage flywheels. In other applications, the heating caused by the magnetic bearing must be removed. Excessive heating can be a significant problem in machines as diverse as large compressors, electric motors, textile spindles, and artificial heart pumps. Allaire, P. E. and Knospe, C. R. and Williams, R. D. and Lewis, D. W. and Barrett, L. E. and Maslen, E. H. and Humphris, R. R. Glenn Research Center NAG3-1334...

Magnetic Bearings
Magnetic Bearings

Author: G. Schweitzer

Publisher: Springer Science & Business Media

Published: 2012-12-06

Total Pages: 387

ISBN-13: 3642517242

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Magnetic Bearings are bearings where the suspension forces are generated magnetically without any contact. The advantages to modern machinery are obvious: no mechanical wear, no lubrication, potential for high rotor speed, accuracy, and high dynamic performance, new constructional solutions to a classical problem in machine dynamics. The realization of such bearings is in rapid progress. Examples for application areas are turbomachinery, centrifuges, vacuum techniques, machine tool spindles, chemical industry, medical devices, robotics, high speed drives, spacecraft equipment, con tactless actuators, vibration isolation. The Symposium is demonstrating the current state of the art in this developing field of mechatronics, showing actual research efforts, reporting on applications in the various areas, and discussing open questions. The main purpose of the Symposium has been to establish a common information basis for people working on magnetic bearings. It will point to promising areas, and it will help to facilitate decisions on research and development projects, and on investments for applications.

Magnetic Bearings for Aerospace Applications
Magnetic Bearings for Aerospace Applications

Author: R. F. Edgar

Publisher:

Published: 1963

Total Pages: 133

ISBN-13:

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A classification of magnetic bearing systems is presented; preliminary design configurations of selected different types are presented, analyzed and discussed. To cover a wide range of potential application, bearing systems capable of sustaining forces at 0.1, 10 and 1000 lb. force levels were studied. Cases were considered in which the load was undirectional (radial or axial) or combined. In aerospace applications, total weight of the bearing system is extremely important. For the purpose of relative ranking of the different design configurations, therefore, estimates were made of the weight penalities for the fixed and supported members, associated power supply and control equipment. Based on this criterion, cer tain configurations appear superior; for example, bearing systems relying on permanent magnets in attraction to support 10 lb. axial force are estimated to weigh about thirty times less than a.c. electromagnets. Systems required to sustain both axial and radial loads of equal magnitude were studied. A permanent magnet arrangement combined with a servostabilized electromagnet has the lowest weight penalities for the three force levels considered when both are used in attrac tion. At the lowest force level (0.1 lb) for a freely suspended system, the a.c. resonant cir cuit configuration approaches the permanent magnet in low weight penalty.

Magnetic Bearings
Magnetic Bearings

Author: Gerhard Schweitzer

Publisher: Springer Science & Business Media

Published: 2009-06-10

Total Pages: 541

ISBN-13: 3642004970

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Compiling the expertise of nine pioneers of the field, Magnetic Bearings - Theory, Design, and Application to Rotating Machinery offers an encyclopedic study of this rapidly emerging field with a balanced blend of commercial and academic perspectives. Every element of the technology is examined in detail, beginning at the component level and proceeding through a thorough exposition of the design and performance of these systems. The book is organized in a logical fashion, starting with an overview of the technology and a survey of the range of applications. A background chapter then explains the central concepts of active magnetic bearings while avoiding a morass of technical details. From here, the reader continues to a meticulous, state-of-the-art exposition of the component technologies and the manner in which they are assembled to form the AMB/rotor system. These system models and performance objectives are then tied together through extensive discussions of control methods for both rigid and flexible rotors, including consideration of the problem of system dynamics identification. Supporting this, the issues of system reliability and fault management are discussed from several useful and complementary perspectives. At the end of the book, numerous special concepts and systems, including micro-scale bearings, self-bearing motors, and self-sensing bearings, are put forth as promising directions for new research and development. Newcomers to the field will find the material highly accessible while veteran practitioners will be impressed by the level of technical detail that emerges from a combination of sophisticated analysis and insights gleaned from many collective years of practical experience. An exhaustive, self-contained text on active magnetic bearing technology, this book should be a core reference for anyone seeking to understand or develop systems using magnetic bearings.

Magnetic Bearings, Magnetic Drives and Dry Gas Seals Conference
Magnetic Bearings, Magnetic Drives and Dry Gas Seals Conference

Author:

Publisher: CRC Press

Published: 1997-08-12

Total Pages: 376

ISBN-13: 9781566765992

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A pre-conference collection of 30 papers that contribute to the event's purpose of promoting the use of magnetic bearings in industrial applications. They cover applications in pumps, turbines, machining, textile spindles, compressors, and fans; auxiliary bearings; magnetic suspension; controls; mod

Magnetic Bearings for Mechanical Cardiac Assist Devices
Magnetic Bearings for Mechanical Cardiac Assist Devices

Author: Steven Day

Publisher: Momentum Press

Published: 2015

Total Pages: 57

ISBN-13: 9780791860410

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"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 assist devices (VADs) to increase design life, reduce or eliminate material wear and bearing maintenance, as well as to increase biocompatibility by eliminating high fluid stresses and heat generation, both of which are associated with hemolysis, platelet activation and aggregation, and thrombus growth. In this monograph, magnetic bearings and their application in VADs are introduced. First, the operating principles of magnetic bearings are introduced. Typical structures of passive bearings, which are comprised solely of permanent magnets, and active magnetic bearings (AMB), which make use of electromagnets and position sensors to control the position of the rotor, are described. We include some description of all the components of a typical AMB system, including actuator, position sensor, controller, and amplifier, as well as different structures of electromagnet actuators, coils design, and iron selection. A range of position sensors, including those typically used in blood pumps, as well as self-sensing bearings are discussed. The basics of the hardware and the software (control laws) that comprise a typical magnetic bearing system are described. A section describes the performance considerations of magnetic bearings and the effect on the overall performance of an assist device that uses magnetic bearings. Lastly, the magnetic suspension of existing VADs with magnetic bearings are described: Berlin Heart INCOR, Heartware HVAD, WorldHeart Levacor and MiFlow, Terumo Duraheart, PediaFlow, MiTiHeart, and LEV-VAD."--Abstract.

Magnetic Bearings and Bearingless Drives
Magnetic Bearings and Bearingless Drives

Author: Akira Chiba

Publisher: Elsevier

Published: 2005-05-20

Total Pages: 400

ISBN-13: 0080478972

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The application of bearingless drives is emerging as an important technique in the areas of high-speed machinery and motion-control, and this book aims to provide a thorough grounding in the principles behind this cutting-edge technology. Basic principles are described in detail with practical examples to aid understanding, and the different types of bearingless drives are introduced, along with coverage of test machines and applications. Aimed at practising electrical and mechanical engineers and advanced students, Magnetic Bearings and Bearingless Drives provides an essential guide to an area of engineering previously only fully covered by large numbers of academic papers. · Unique and comprehensive coverage of a cutting-edge subject for electrical and mechanical engineers · A reference text and survey for designers, manufacturers and users of high-speed motors, generators and electrical drive systems · Examines the basic principles behind magnetic bearings, with key technologies and applications illustrated through examples and case studies