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  • 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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    NASA TECHNICAL REPORTS
  • 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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    NASA TECHNICAL REPORTS
  • 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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    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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  • 7
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    Mechanical capacitor (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A new energy storage system (the mechanical capacitor), using a spokeless magnetically levitated composite ring rotor, is described and design formulas for sizing the components are presented. This new system is configured around a permanent magnet (flux biased) suspension which has active servo 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 the stationary armature coils is proposed. There is no mechanical contact with the rotating spokeless ring; therefore, long life and near zero rundown losses are projected. A 7-kW h system is sized to demonstrate feasibility. A literature review of flywheel energy storage systems is also presented and general formulas are developed for comparing rotor geometries.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-TN-D-8185 , G-7639
    Format: application/pdf
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  • 8
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    Energy storage apparatus (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A high efficiency, flywheel type energy storage device which comprises an electronically commutated d.c. motor/generator unit having a massive flywheel rotor magnetically suspended around a ring shaped stator is presented. During periods of low energy demand, the storage devices were operated as a motor, and the flywheel motor was brought up to operating speed. Energy was drawn from the device functioning as a generator as the flywheel rotor rotated during high energy demand periods.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Format: application/pdf
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  • 9
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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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  • 10
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    Meeting the challenge of a 50,000-hour-lifetime requirement (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Materials and noncontacting design for 50,000 hour lifetime electromechanical components, noting magnetically suspended motor
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: AEROSPACE MECHANISMS SYMPOSIUM; Jun 15, 1970 - Jun 16, 1970; NASA GODDARD SPACE FLIGHT CENTER, GREENBELT, MD; UNITED STATES
    Format: text
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