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Electrostatic suspension

Electrostatic suspension

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The evolution of frictionless bearings in instruments and machines, including the contactless manipulation of objects, has been advanced predominantly by adopting electromagnetic methods, rather than electrostatic methods, to create levitation and suspension systems as described in Chapter 4. This is partly because, even more so than conventional magnetic levitation, which is only conditionally stable as we have already discovered, electrostatic suspension has generally been considered to be a particularly fraught area of technology because the Earnshaw's rules influence stability more acutely. Nevertheless, electrostatic suspension offers some significant advantages over magnetic techniques.

Chapter Contents:

  • 5.1 Suspension of metallic objects
  • 5.1.1 Air breakdown constraint
  • 5.1.2 Optimum suspension condition
  • 5.1.3 Force equations
  • 5.1.4 Suspension and propulsion
  • 5.2 Electrostatic motors with suspended rotors
  • 5.2.1 Axial-drive micromotor
  • 5.2.2 Force calculations
  • 5.2.3 Axial force expression
  • 5.2.4 Radial force expression
  • 5.2.5 Rotational force expression
  • 5.2.6 Rotational torque expression
  • 5.2.7 Practical axial-drive rotor
  • 5.2.8 Suspension of dielectrics
  • 5.3 Vacuum applications
  • 5.4 Summary
  • 5.5 References

Inspec keywords: electrostatics; magnetic fluids; magnetic levitation

Other keywords: magnetic techniques; suspension systems; levitation systems; frictionless bearings evolution; electrostatic suspension; machines; Earnshaw's rules; electrostatic methods; contactless manipulation; instruments; magnetic levitation; metallic objects suspension

Subjects: Other electromagnetic device applications; Magnetic materials; Magnetic liquids

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