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  • MACHINERY  (10)
  • ENERGY PRODUCTION AND CONVERSION  (6)
  • MACHINE ELEMENTS AND PROCESSES  (5)
  • 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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  • 2
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    Flywheel energy storage. II - Magnetically suspended superflywheel (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: This article, the second of a two part paper, describes the general design requirements for a flywheel energy storage system. A new superflywheel energy storage system, using a spokeless, magnetically suspended, composite material pierced disk rotor is proposed. The new system is configured around a permanent magnet ('flux biased') magnetic suspension system with active control in the radial direction and passive control in the axial direction. The storage ring is used as a moving rotor and electronic commutation of stationary armature coils is proposed. There is no mechanical contact with the rotating ring and long life and low run down losses are projected. A discussion of major components for a 10 kwh system is presented.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: International Journal of Mechanical Sciences; 19; 4, 19; 1977
    Format: text
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  • 3
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    Reaction wheels for kinetic energy storage (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: In contrast to all existing reaction wheel implementations, an order of magnitude increase in speed can be obtained efficiently if power to the actuators can be recovered. This allows a combined attitude control-energy storage system to be developed with structure mounted reaction wheels. The feasibility of combining reaction wheels with energy storage wwheels is demonstrated. The power required for control torques is a function of wheel speed but this energy is not dissipated; it is stored in the wheel. The I(2)R loss resulting from a given torque is shown to be constant, independent of the design speed of the motor. What remains, in order to efficiently use high speed wheels (essential for energy storage) for control purposes, is to reduce rotational losses to acceptable levels. Progress was made in permanent magnet motor design for high speed operation. Variable field motors offer more control flexibility and efficiency over a broader speed range.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA. Langley Research Center An Assessment of Integrated Flywheel System Technol.; p 329-340
    Format: application/pdf
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  • 4
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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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  • 5
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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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  • 6
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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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  • 7
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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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  • 8
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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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  • 9
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    Stirling cycle cryogenic cooler (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A long lifetime Stirling cycle cryogenic cooler particularly adapted for space applications is described. It consists of a compressor section centrally aligned end to end with an expansion section, and respectively includes a reciprocating compressor piston and displacer radially suspended in interconnecting cylindrical housings by active magnetic bearings and has adjacent reduced clearance regions so as to be in noncontacting relationship therewith and wherein one or more of these regions operate as clearance seals. The piston and displacer are reciprocated in their housings by linear drive motors to vary the volume of respectively adjacent compression and expansion spaces which contain a gaseous working fluid and a thermal regenerator to effect Stirling cycle cryogenic cooling.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Format: application/pdf
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  • 10
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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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