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  • 1
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    Unknown
    A practical magnetic bearing (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: A small compact magnetic bearing design developed and tested features a bearing capable of supporting over ten times its own weight, dimensioned 8 cm diam by 3.75 cm, with rare-earth cobalt magnets. Only 1% of the device payload figures as part of the magnetic suspension. The design is servoed in two axes and exhibits inherent stability in three more degrees of freedom, with full rotational freedom in the desired axis. Capacitive radial gap sensing allows stiff servoing of the rotation axis. Differential sensing and EM control linearize control functions. Low power drain, simple fabrication and assembly, and larger clearances than in air bearings or ball bearings are reported
    Keywords: MECHANICAL ENGINEERING
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Low Power Magnetic Bearing Design for High Speed Rotating Machinery (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-29
    Description: Magnetic suspension technology has advanced to the point of being able to offer a number of advantages to a variety of applications in the rotating machinery and aerospace fields. One strong advantage is the decrease in power consumption. The design and construction of a set of permanent magnet biased, actively controlled magnetic bearing for a flexible rotor are presented. Both permanent magnets and electromagnets are used in a configuration which effectively provides the necessary fluxes in the appropriate air gaps, while simultaneously keeping the undesirable destabilizing forces to a minimum. The design includes two radial bearings and a thrust bearing. The theoretical development behind the design is briefly discussed. Experimental performance results for a set of operating prototype bearings is presented. The results include measurements of load capacity, bearing stiffness and damping, and the dynamic response of the rotor. With few exceptions, the experimental results matched very well with the predicted performance. The power consumption of these bearings was found to be significantly reduced from that for a comparable set of all electromagnetic bearings.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA. Langley Research Center, International Symposium on Magnetic Suspension Technology, Part 1; p 317-329
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Flexible robotic arm (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A plurality of identical modules are serially connected together with each module including a base plate and a top plate interconnected by a ball joint assembly so that the top plate is adapted to pivotally nutate around the base plate to describe a cone in space. An array of twenty-four electromagnets, sequentially energized in sets of three, are arranged in a ring around the periphery of the base plate. Selective energization of the eight sets of electromagnets causes the rim of the top plate to be magnetically attracted to the energized electromagnets. The tilt of the top pivot plate is detected and controlled over a range of 360 degrees, thus permitting a series string of modules to assume any desired elongated configuration.
    Keywords: MECHANICAL ENGINEERING
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    System considerations for a magnetically suspended flywheel (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: This paper presents the system considerations of a magnetically suspended energy storage system. The key technologies for system success are presented in a technology flowchart. The key areas identified and discussed include: the active bearing control system, the back-up touchdown bearings, and the flywheel dynamic performance and balancing. Two possible hardware designs are described which have been identified as having characteristics suitable for energy storage in low earth orbit spacecraft. Finally, a matrix of the key technologies versus the various prototype designs is presented to show the current progress of inertial energy storage, and to show the direction of future work.
    Keywords: MECHANICAL ENGINEERING
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    NASA TECHNICAL REPORTS
  • 5
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    High efficiency magnetic bearings (1993)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Research activities concerning high efficiency permanent magnet plus electromagnet (PM/EM) pancake magnetic bearings at the University of Maryland are reported. A description of the construction and working of the magnetic bearing is provided. Next, parameters needed to describe the bearing are explained. Then, methods developed for the design and testing of magnetic bearings are summarized. Finally, a new magnetic bearing which allows active torque control in the off axes directions is discussed.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA. Langley Research Center, Magnetic Suspension Technology Workshop; p 327-337
    Format: application/pdf
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  • 6
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    Linear magnetic bearing (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A linear magnetic bearing system having electromagnetic vernier flux paths in shunt relation with permanent magnets, so that the vernier flux does not traverse the permanent magnet, is described. Novelty is believed to reside in providing a linear magnetic bearing having electromagnetic flux paths that bypass high reluctance permanent magnets. Particular novelty is believed to reside in providing a linear magnetic bearing with a pair of axially spaced elements having electromagnets for establishing vernier x and y axis control. The magnetic bearing system has possible use in connection with a long life reciprocating cryogenic refrigerator that may be used on the space shuttle.
    Keywords: MECHANICAL ENGINEERING
    Format: application/pdf
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  • 7
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    Magnetic bearings for instruments in the space environment (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A magnetic bearing development is documented, which has been successfully applied to support a 0.9 kg - 19 cm diameter rotor in 5 degrees of freedom, with fully controlled drive capability to plus or minus 200 rad/s in the other axis. The construction details are described and illustrated. Performance data on five design variations are presented which extend the load capacity to 8 kilograms at which point the bearing element on the rotor is less than one-half of 1 percent of the total load capacity.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TM-78048
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Magnetic bearing and motor (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A magnetic bearing for passively suspending a rotatable element subjected to axial and radial thrust forces is disclosed. The magnetic bearing employs a taut wire stretched along the longitudinal axis of the bearing between opposed end pieces and an intermediate magnetic section. The intermediate section is segmented to provide oppositely directed magnetic flux paths between the end pieces and may include either an axially polarized magnets interposed between the segments. The end pieces, separated from the intermediate section by air gaps, control distribution of magnetic flux between the intermediate section segments. Coaxial alignment of the end pieces with the intermediate section minimizes magnetic reluctance in the flux paths endowing the bearing with self-centering characteristics when subjected to radial loads. In an alternative embodiment, pairs of oppositely wound armature coils are concentrically interposed between segments of the intermediate section in concentric arcs adjacent to radially polarized magnets to equip a magnetic bearing as a torsion drive motor. The magnetic suspension bearing disclosed provides long term reliability without maintenance with application to long term space missions such as the VISSR/VAS scanning mirror instrument in the GOES program.
    Keywords: MECHANICAL ENGINEERING
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  • 9
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    Magnetic bearing (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A magnetic bearing is described which includes a pair of coaxial, toroidal, and permanent magnets having axially directed poles. Like poles of the permanent magnets are adjacent to each other, whereby the permanent magnets have a tendency to be urged apart along the common axis. An electromagnet is wound coaxially with the permanent magnets in such a manner that the poles are axially directed. Between the poles of each permanent magnet there is a low magnetic reluctance circuit including two series air gaps. Between the poles of the electromagnet a low reluctance path including only one air gap of each of the low magnetic reluctance circuits is provided. The low reluctance path for the electromagnet includes a ring axially translatable relative to the permanent magnets. The ring forms opposite faces of the air gaps in the magnetic circuits for each permanent magnet.
    Keywords: MECHANICAL ENGINEERING
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    A high efficiency motor/generator for magnetically suspended flywheel energy storage system (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The authors discuss the theory and design of a brushless direct current motor for use in a flywheel energy storage system. The motor design is optimized for a nominal 4.5-in outside diameter operating within a speed range of 33,000-66,000 revolutions per minute with a 140-V maximum supply voltage. The equations which govern the motor's operation are used to compute a series of acceptable design parameter combinations for ideal operation. Engineering tradeoffs are then performed to minimize the irrecoverable energy loss while remaining within the design constraint boundaries. A final integrated structural design whose features allow it to be incorporated with the 500-Wh magnetically suspended flywheel is presented.
    Keywords: MECHANICAL ENGINEERING
    Type: IECEC-89; Aug 06, 1989 - Aug 11, 1989; Washington, DC; United States
    Format: text
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    NASA TECHNICAL REPORTS
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