The Passive Characteristics of a Repulsion Magnetic Bearing

Abstract

Magnetic suspension systems can meet the requirements for spacecraft momentum wheel bearings. The main aim of the work described in this Report was to investigate the effects of interleaving soft iron spacer rings of various thicknesses between the magnetic rings of a repulsion type magnetic bearing. An optimum thickness of iron ring was found which produced a maximum increase in radial stiffness over the stiffness obtained with iron spacers. The magnetic inhomogeneity of the magnets was measured and found to have a small effect on the radial stiffness. Theory predicts that a single repulsion bearing will be cross-axially stable if the ratio of its length to diameter exceeds 3. This value was confirmed within the uncertainty of the experiment. The external magnetic fields from representative bearing assemblies were measured. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1976
Accession Number
ADA041080

Entities

People

  • D. W. Lodge

Organizations

  • Royal Aircraft Establishment

Tags

Communities of Interest

  • Advanced Electronics
  • Sensors

DTIC Thesaurus Topics

  • Angular Momentum
  • Angular Motion
  • Barium Ferrites
  • Bearings
  • Ferrites
  • Flux Density
  • Magnetic Bearings
  • Magnetic Fields
  • Magnetic Flux Density
  • Magnetic Materials
  • Magnetic Properties
  • Magnetization
  • Magnets
  • Materials
  • Measurement
  • Permanent Magnets
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Electrical Engineering
  • Quantum spin resonance or Electron Paramagnetic Resonance spectroscopy.
  • Tribology (the study of the boundary interaction between sliding surfaces, lubrication, wear and friction).

Technology Areas

  • Space
  • Space - Hall-Effect Thruster