Title :
A vertically reciprocating NbTi solenoid used in a regenerative magnetic refrigerator
Author :
Trueblood, J.R. ; Claybaker, P.J. ; Johnson, J.W. ; Stankey, T.M.
Author_Institution :
Astronaut. Technol. Center, Madison, WI, USA
fDate :
3/1/1991 12:00:00 AM
Abstract :
An 8.2T-NbTi superconducting solenoid used for periodic magnetization by vertical motion along a bed of magnetocaloric material in a regenerative magnetic refrigerator using all active magnetic regenerator (AMR) has been designed, fabricated, and tested. The magnet design had two primary requirements: field uniformity and minimum stray flux. The magnet is charged with demountable leads and switched into persistent mode. Wheels and tracks guide the magnet in a liquid-helium dewar which is part of a larger environment cooled by a gas cycle refrigerator. Positioning of the magnet is determined by a computer-driven, PI-controlled linear actuator servo. design, test configuration, and test results of the solenoid systems are described
Keywords :
computerised control; electric actuators; magnetic cooling; niobium alloys; position control; refrigerators; servomechanisms; solenoids; superconducting magnets; titanium alloys; type II superconductors; 8.2 T; PI-controlled linear actuator servo; active magnetic regenerator; demountable leads; gas cycle refrigerator; liquid-helium dewar; magnet design; periodic magnetization; persistent mode; regenerative magnetic refrigerator; superconducting solenoid; vertically reciprocating NbTi solenoid; Magnetic flux; Magnetic materials; Magnetization; Niobium compounds; Refrigeration; Solenoids; Superconducting magnets; Superconducting materials; System testing; Titanium compounds;
Journal_Title :
Magnetics, IEEE Transactions on
