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  • 1
    Electronic Resource
    Electronic Resource
    Motional eddy currents in a nonmagnetic conducting laminate backed with an iron substrate (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 3860-3862 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This paper discusses the eddy currents induced in a nonmagnetic conducting laminate on an iron substrate. These results are applicable to the analysis of linear induction motors, ordinary induction machines with sleeve rotors, and eddy current couplings. Under appropriate assumptions it is shown that the boundary conditions and Ampere's circuital law reduce the problem to eight linear simultaneous equations. Simple algebraic expressions for the current density and power dissipation in the laminate are obtained in terms of the solutions of the above simultaneous equations. Numerical results for typical situations are presented, and a brief discussion of the experimental verification of the analysis is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.334895
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Structural and compositional studies of magnetron-sputtered Nd–Fe–B thin films on Si(100) (1998)
    Springer
    Journal of materials science 33 (1998), S. 1349-1357 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The structure and composition of the Nd–Fe–B thin films deposited on Si(100) have been investigated. Films have been prepared by direct-current magnetron sputtering in pure argon and xenon sputter media separately. Deposition has been carried out keeping the substrates at room temperature and 360°C. These films were subjected to the post-deposition annealing to a temperature of 60O°C in a vacuum of 5×10−7 Torr. The stoichiometry and structure of these films were analysed and correlated to the deposition and annealing conditions. Films deposited in xenon sputter medium showed better crystalline properties than those sputtered in pure argon. This difference was attributed to the presence of reflected high-energy neutral gas particles in the argon medium. Films deposited in xenon were found to be relatively rich in boron compared with argon-sputtered films. Post-deposition annealing resulted in the interdiffusion at the interface between the film and substrate. The use of a SiO2 film as a barrier layer between the silicon substrate and the Nd–Fe–B film has been explored. Thermally grown SiO2 was found to be an effective diffusion barrier. © 1998 Chapman & Hall
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004314801755
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    Paper (German National Licenses)
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  • 3
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    Motional eddy currents in a nonmagnetic conducting laminate backed with an iron substrate (1985)
    American Institute of Physics
    Details
    Publication Date: 1985-04-15
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
    Published by American Institute of Physics
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    PAPER CURRENT
  • 4
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    Design and fabrication of a micro magnetic bearing (2000)
    Institute of Physics
    Details
    Publication Date: 2000-04-01
    Print ISSN: 0964-1726
    Electronic ISSN: 1361-665X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Institute of Physics
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    PAPER CURRENT
  • 5
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    Wide-band low-input-impedance trans-impedance amplifiers for instrumentation applications (1997)
    Institute of Physics
    Details
    Publication Date: 1997-11-01
    Print ISSN: 0957-0233
    Electronic ISSN: 1361-6501
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Published by Institute of Physics
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    PAPER CURRENT
  • 6
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    Modelling and design for PM/EM magnetic bearings (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-29
    Description: A mathematical model of a permanent magnet/electromagnet (PM/EM) radially active bearing is presented. The bearing is represented by both a reluctance model and a stiffness model. The reluctance model analyzes the magnetic circuit of the PM/EM bearings. By combining the two models, the performance of the bearing can be predicted given geometric dimensions, permanent magnet strength, and the parameters of the EM coils. The overall bearing design including the PM and EM design is subject to the performance requirement and physical constraints. A study of these requirements and constraints is discussed. The PM design is based on the required magnetic flux for proper geometric dimensions and magnet strength. The EM design is based on the stability and force slew rate consideration, and dictates the number of turns for the EM coils and the voltage and current of the power amplifier. An overall PM/EM bearing design methodology is proposed and a case study is also demonstrated.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA. Langley Research Center, International Symposium on Magnetic Suspension Technology, Part 1; p 105-120
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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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
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    H Infinity Control of Magnetic Bearings to Ensure Both System and External Periodic Disturbance Robustness (1996)
    In:  CASI
    Details
    Publication Date: 2019-08-15
    Description: Both self-excited and forced disturbances often lead to severe rotor vibrations in a magnetic bearing systems with long slender shafts. This problem has been studied using the H-infinity method, and stability with good robustness can be achieved for the linearized model of a magnetic bearing when small transient disturbances are applied. In this paper, the H-infinity control method for self-excited and forced disturbances is first reviewed. It is then applied to the control of a magnetic bearing rotor system. In modelling the system, the shaft is first discretized into 18 finite elements and then three levels of condensation are applied. This leads to a system with three masses and three compliant elements which can be described by six state variable coordinates. Simulation of the resultant system design has been performed at speeds up to 10,000 rpm. Disturbances in terms of different initial displacements, initial impulses, and external periodic inputs have been imposed. The simulation results show that good stability can be achieved under these different transient disturbances using the proposed controller while at the same time reducing the sensitivity to external periodic disturbances.
    Keywords: Mechanical Engineering
    Type: Third International Symposium on Magnetic Suspension Technology; Part 1; 165-175; NASA-CP-3336-Pt-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Final prototype of magnetically suspended flywheel energy storage system (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A prototype of a 500 Wh magnetically suspended flywheel energy storage system was designed, built, and tested. The authors present the work done and include the following: (1) a final design of the magnetic bearing, control system, and motor/generator, (2) construction of a prototype system consisting of the magnetic bearing stack, flywheel, motor, container, and display module, and (3) experimental results for the magnetic bearings, motor, and the entire system. The successful completion of the prototype system has achieved: (1) manufacture of tight tolerance bearings, (2) stability and spin above the first critical frequency, (3) use of inside sensors to eliminate runout problems, and (4) integration of the motor and magnetic bearings.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: IECEC ''91: Intersociety Energy Conversion Engineering Conference; Aug 04, 1991 - Aug 09, 1991; Boston, MA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Improved operation of magnetic bearings for flywheel energy storage system (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Analysis and operation of prototype 500-Wh flywheel at low speeds have shown that many factors affect the correct functioning of the magnetic bearings. An examination is made of a number of these, including magnetic bearing control system nonlinearities and displacement transducer positioning, and their effects upon the successful operation of the suspension system. It is observed that the bearing control system is extremely sensitive to actuator parameters such as coil inductance. As a consequence of the analysis of bearing relaxation oscillations, the bearing actuator design methodology which has previously been used, where coil parameter selection is based upon static considerations, has been revised. Displacement transducer sensors which overcome the collocation problem are discussed.
    Keywords: MECHANICAL ENGINEERING
    Type: Intersociety Energy Conversion Engineering Conference; Aug 12, 1990 - Aug 17, 1990; Reno, NV; United States
    Format: text
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    NASA TECHNICAL REPORTS
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