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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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    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
  • 3
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    Magnetic Bearings for Inertial Energy Storage (1983)
    In:  CASI
    Details
    Publication Date: 2014-09-10
    Description: The selection of a noncontacting bearing technique with no wear out phenomena and which is vacuum compatible which is the decisive factor in selecting magnetic bearings for kinetic energy storage was investigated. Unlimited cycle life without degradation is a primary goal. Storage efficiency is a key parameter which is defined as the ratio of the energy remaining to energy stored after a fixed time interval at no load conditions. Magnetic bearings, although noncontacting, are not perfectly frictionless in that magnetic losses due to eddy currents and hysteresis can occur. Practical magnetic bearings, however, deviate from perfect symmetry and have discontinuities and asymmetric flux paths either by design or when controlled in the presence of disturbances, which cause losses. These losses can be kept smaller in the bearings than in a high power motor/generator, however, are a significant factor in selecting the magnetic bearing type.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: NASA. Langley Research Center Integrated Flywheel Technol., 1983; p 133-140
    Format: text
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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
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  • 5
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    An ironless armature brushless torque motor (1973)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A high torque motor with improved servo mechanism is reported. Armature windings are cast into an epoxy cylinder and armature conductors are integrally cast with an aluminum mounting ring which provides thermal conductance directly into the structure. This configuration eliminates magnetic hysteresis because there is no relative motion between the rotating magnetic field and any stationary iron. The absence of destabilization forces provides a fast electrical response compared with a typical torquer of conventional construction.
    Keywords: ELECTRONIC EQUIPMENT
    Type: Significant Accomplishments in Technol., 1972; p 53-55
    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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    NASA TECHNICAL REPORTS
  • 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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    Non-contacting power transfer device (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A transformer for coupling AC electrical energy from a stationary element to a rotating element without the use of sliding contacts is described. The transformer is of the rotary type and includes a ferrite core and two primary windings which are stationary with respect to a seconary winding which rotates within an annular cavity adjacent an axial bore in the core. The core is comprised of two cup type core halves. Electrical connection to the secondary winding is made through a split bobbin assembly which couples to a coaxial shaft assembly located in the axial bore. The electrical coupling to the coaxial shaft assembly is made through a continuous transverse channel connecting the axial bore with the annular cavity. The transverse channel forms a single air gap; however, it is not open directly to free space but is shielded by the magnetic permeable material of the core halves.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Format: application/pdf
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  • 10
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    Linear magnetic motor/generator (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A linear magnetic motor/generator is disclosed which uses magnetic flux to provide mechanical motion or electrical energy. The linear magnetic motor/generator includes an axially movable actuator mechanism. A permament magnet mechanism defines a first magnetic flux path which passes through a first end portion of the actuator mechanism. Another permament magnet mechanism defines a second magnetic flux path which passes through a second end portion of the actuator mechanism. A drive coil defines a third magnetic flux path passing through a third central portion of the actuator mechanism. A drive coil selectively adds magnetic flux to and subtracts magnetic flux from magnetic flux flowing in the first and second magnetic flux path.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Format: application/pdf
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