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  • 1
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    Meeting the challenge of a 50000-hour-life-time requirement (1971)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: Space mission requirements for the 70's have established a 50,000-hour-lifetime challenge for the mechanisms designer. This challenge may be met by two approaches: (1) development of new materials for wear-prone elements, and (2) design innovation of new electromechanical devices that do not include mechanical wear-prone components. Present state-of-the-art materials require restricted operation regarding load, speed, and power for gears, bearings, and brush-slipring components. These restrictions are discussed, and methods of improvement are suggested. The design-innovations approach is discussed and is illustrated by the design of an experimental magnetically suspended motor.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: 5th Aerospace Mech. Symp.; p 159-164
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    A review of the technology of noncontacting systems (1973)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Advanced components are the fundamental building blocks of advanced systems and spacecraft. Non-contacting elements, including magnetic bearings, brushless and ironless armature motors, rotary transformers and encoders, are discussed. Most of the information presented in this paper has been generated from a continuing program of component development. The aim of this paper is to identify some of the important design features and provide a perspective on the state of development reached to date.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: The 8th Aerospace Mech. Symp.; p 117-130
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Development of a sealed brushless dc motor (1965)
    In:  CASI
    Details
    Publication Date: 2019-05-23
    Description: Sealed brushless dc motor using photoelectronic commutation - spacecraft component
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-TN-D-2819
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Magnetic Bearings Would Increase Pump Efficiency (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Active feedback applied to bearings windings compensate for unbalanced forces. Helical-screw rotation compresses and transports gas charges, which subject shafts to forces tend to displace them from their equilibrium positions. Magnetic bearings restore shafts to equilibrium, lowering friction and increasing efficiency.
    Keywords: MACHINERY
    Type: GSC-12668 , NASA Tech Briefs (ISSN 0145-319X); 7; 1; P. 76
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Passive Magnetic Bearing (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Magnetic bearing for limited rotation devices requires no feedback control system to sense and correct shaft position. Passive Magnetic Torsion Bearing requires no power supply and has no rubbing parts. Torsion wire restrains against axial instability. Magnetic flux geometry chosen to assure lateral stability with radial restoring force that maintains alignment.
    Keywords: MACHINERY
    Type: GSC-12726 , NASA Tech Briefs (ISSN 0145-319X); 7; 322; No. 3
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Magnetic Bearing Consumes Low Power (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Energy-efficient linear magnetic bearing maintains a precise small separation between its moving and stationary parts. Originally designed for cryogenic compressors on spacecraft, proposed magnetic bearing offers an alternative to roller or gas bearing in linear motion system. Linear noncontacting bearing operates in environments where lubricants cannot be used.
    Keywords: MACHINERY
    Type: GSC-12517 , NASA Tech Briefs (ISSN 0145-319X); 6; 2; P. 200
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Low-loss energy storage flywheel (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Magnetically-levitated, ironless-armature spokeless rotor is used. Ironless armature construction eliminates core losses due to hysteresis and eddy currents. Device combines features of homopolar salient poles and stationary ironless electronically commutated armature.
    Keywords: MACHINERY
    Type: GSC-12030 , NASA Tech Briefs (ISSN 0145-319X); 2; 1; P. 3
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Long-Life Cryogenic Cooler (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Magnetic bearings and noncontacting seals let cooler operate unattended at 65 K for more than 3 years. New cooler uses magnetic bearings, small piston/cylinder clearance seals, and linear motors. Cooler consists of compression and expansion sections connected end-to-end. Compression section houses reciprocating hollow piston driven by linear motor.
    Keywords: MACHINERY
    Type: GSC-12697 , NASA Tech Briefs (ISSN 0145-319X); 9; 1; P. 140
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    A linear magnetic motor and generator (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: In linear magnetic motor and generator suitable for remote and hostile environments, magnetic forces drive reciprocating shaft along its axis. Actuator shaft is located in center of cylindrical body and may be supported by either contacting or noncontacting bearings. When device operates as bidirectional motor, drive coil selectively adds and subtracts magnetic flux to and from flux paths, producing forces that drive actuator along axis. When actuator is driven by external reciprocating engine, device becomes ac generator.
    Keywords: MACHINERY
    Type: GSC-12518 , NASA Tech Briefs (ISSN 0145-319X); 5; 2; P. 226
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Magnetic bearings for spacecraft (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Magnetic bearings have been successfully applied to motorized rotor systems in the multi-kilogram range, at speeds up to 1200 radians per second. These engineering models also indicated the need for continued development in specific areas to make them feasible for spacecraft applications. Significant power reductions have recently been attained. A unique magnetic circuit, combining permanent magnets with electromagnetic control, has a bidirectional forcing capability with improved current sensitivity. The multi-dimensional nature of contact-free rotor support is discussed. Stable continuous radial suspension is provided by a rotationally symmetric permanent magnet circuit. Two bearings, on a common shaft, counteract the normal instability perpendicular to the rotational axis. The axial direction is servoed to prevent contact. A new bearing technology and a new field of application for magnetics is foreseen.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-TM-X-66111 , X-721-72-56
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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