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HIGH-CRITICAL TEMPERATURE SUPERCONDUCTING LEVITATION MOTOR WITH A LASER COMMUTATOR.

Author(s) : WEEKS D. E.

Type of article: Article

Summary

SIGNIFICANT IMPROVEMENTS AND EXTENSIONS HAVE BEEN MADE TO A HIGH CRITICAL TEMPERATURE SUPERCONDUCTING LEVITATION MOTOR WITH AN OPTICAL COMMUTATOR. THE PRIMARY EXTENSION IS THE DEVELOPMENT OF A HEAT EXCHANGER THAT PERMITS HIGH CRITICAL TEMPERATURE SUPERCONDUCTORS TO BE COOLED WITH LIQUID NITROGEN IN VACUUMS OF 1.33 MILLIPASCAL (0.01 MILLITORR) AND LESS. THIS PERMITS THE LEVITATION MOTOR TO BE OPERATED WITHOUT THE DECELERATING FORCE OF ATMOSPHERIC DRAG. THE RESULT IS AN INCREASE OF NEARLY 2 ORDERS OF MAGNITUDE IN THE SUSTAINABLE ROTATIONAL FREQUENCY FROM A MAXIMUM OF 10/S AT ATMOSPHERIC PRESSURE TO 500/S (30,000 RPM) AT 1.33 MILLIPASCAL (0.01 MILLITORR). THE CORRESPONDING TANGENTIAL VELOCITY OF THE ROTOR ARMS INCREASED FROM 3 M/S TO 155 M/S. ANGULAR FREQUENCIES BETWEEN 100/S AND 200/S HAVE BEEN SUSTAINED FOR PERIODS EXCEEDING 6 H.

Details

  • Original title: HIGH-CRITICAL TEMPERATURE SUPERCONDUCTING LEVITATION MOTOR WITH A LASER COMMUTATOR.
  • Record ID : 1992-0092
  • Languages: English
  • Source: Rev. sci. Instrum. - vol. 62 - n. 2
  • Publication date: 1991/02
  • Document available for consultation in the library of the IIR headquarters only.

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