Superconductive material and magnetic field for damping and levitation support and damping of cryogenic instruments

• US 5,334,965 A
• Filed: 06/15/1993
• Issued: 08/02/1994
• Est. Priority Date: 06/15/1993
• Status: Expired due to Fees

• Current Assignee: The United States of America As Represented By The Secretary of Agriculture
• Original Assignee: United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration
• Inventors: Dolgin, Benjamin P.
• Primary Examiner(s): Picard, Leo P.
• Assistant Examiner(s): RYAN, STEPHEN
• Application Number:
  US08/077,470
• Time in Patent Office: 413 Days
• Field of Search: 335/216, 310/90.5, 361/141, 361/143, 361/144, 361/147, 361/146, 361/139, 156/DIG. 2, 104/281-286
• US Class Current: 335/216
• CPC Class Codes: B64G 1/22 Parts of, or equipment specially adapted for fitting in or to, cosmonautic vehicles
• CPC Class Codes: F16C 2326/47 Cosmonautic vehicles, i.e. bearings adapted for use in outer-space
• CPC Class Codes: F16C 27/00 Elastic or yielding bearings or bearing supports, for exclusively rotary movement shock-damping bearings for watches or clocks G04B31/02
• CPC Class Codes: F16C 32/0438 with a superconducting body, e.g. a body made of high temperature superconducting material such as YBaCuO
• CPC Class Codes: F16F 15/03 using magnetic or electromagnetic means F16F9/53, F16F15/005 take precedence
• CPC Class Codes: G12B 3/08 Damping of movements, e.g. to promote rapid non-oscillatory movement to a final reading

Abstract

A superconductive load bearing support without a mechanical contact and vibration damping for cryogenic instruments in space. The levitation support and vibration damping is accomplished by the use of superconducting magnets and the "Meissner" effect. The assembly allows for transfer of vibration energy away from the cryogenic instrument which then can be damped by the use of either an electronic circuit or conventional vibration damping apparatus.

Claims

1. A system for levitation which depends upon the Meissner effect and for vibration damping of a cryogenic instrument inside a cold chamber comprising

superconductive material rigidly attached to or coated on said cryogenic instrument inside said cold chamber,

a magnetic flux source outside said cold chamber,

a vibration damping means attached to said magnetic flux source outside of said cold chamber, whereby said cryogenic instrument is levitated by force generated by Meissner-effect repulsion, and vibrational energy of said superconductive material rigidly attached to or coated on said cryogenic instrument is transferred to said magnetic flux source outside said cold chamber and there dampened by said vibration damping means.

2. A levitation and vibration damping system for a cryogenic instrument inside a cold chamber as defined in claim 1 wherein said vibration damping means comprises

a pick-up coil around said magnetic flux source, said pick-up coil being connected in series with a resistor,

whereby vibrational energy of said superconductive material is transformed into electrical current in said pick-up coil which is in turn transformed into heat in said series connected resistor to dampen vibration of said superconductive material and thereby dampen vibration of said cryogenic instrument.

3. A levitation and vibration damping system for cryogenic instruments inside a cold chamber as defined in claim 1 wherein said magnetic flux source comprises a permanent magnet and said vibration damping means comprises a hydraulic damper rigidly attached to said permanent magnet.

4. A levitation and vibration damping system for cryogenic instruments inside a cold chamber as defined in claim 2 wherein said magnetic flux source outside said cold chamber is an electromagnet comprising a winding around a core and an electrical power source for current through said winding.

5. A levitation and vibration damping system for a cryogenic instrument inside a cold chamber as defined in claim 4, wherein current from said electric power source is controlled in response to a feedback signal, and said vibration damping means comprises an optical position sensing means for producing a feedback signal for control of said variable electric power source in response to any motion of said cryogenic instrument with respect to said cold chamber, thereby maintaining position of said cryogenic instrument in said cold chamber constant while damping vibration of said cryogenic instrument.