Title :
Meissner motor using high-Tc ceramic superconductors
Author :
Takeoka, A. ; Ishikawa, A. ; Suzuki, M. ; Niki, K. ; Kuwano, Y.
Author_Institution :
Sanyo Electr. Co. Ltd., Osaka, Japan
fDate :
3/1/1989 12:00:00 AM
Abstract :
The authors developed a superconducting motor using high-Tc ceramic superconductors. This motor, which utilizes the repulsive force caused by the Meissner effect that appears below Tc, is called the Meissner motor. The motor rotated at a maximum speed of 40 rpm. Though the repulsive force to drive the motor increased with the decrease of temperature or the increase of the gradient magnetic field, it was only about 1.1 gf/g at 77 K in 3500 G/cm. The motor has a maximum torque of 5.0 gf-cm theoretically, but actually had a torque below 0.66 gf-cm, because it took some time to be cooled below Tc. The rotating speed of the motor was limited by heating ability, and its torque was limited by cooling ability
Keywords :
Meissner effect; high-temperature superconductors; superconducting machines; 77 K; Meissner effect; high temperature superconductors; high-Tc ceramic superconductors; repulsive force; superconducting motor; Ceramics; Force measurement; Magnetic field measurement; Nitrogen; Permanent magnet motors; Permanent magnets; Superconducting magnets; Superconductivity; Temperature dependence; Torque;
Journal_Title :
Magnetics, IEEE Transactions on
