Patent ID: 6031440
Filing Date: 2000-02-29
Classification: G02F,H01F

Abstract:
A thermally controlled variable magnetic reluctor structure, which comprises:an iron yoke magnetic flux source producing a magnetic flux, said flux source having a first ""U`-shaped body opposed by a second ""U""-shaped body and a given ambient temperature;said first ""U""-shaped body having an upper arm and a lower arm;said second ""U""-shaped body having an upper arm and a lower arm;a working space located between said upper arms and a reluctor space located between said lower arms;said magnetic flux, having a given magnetic permeance and a given magnetic reluctivity, flows in a magnetic flux path within said working space;a reluctor member inserted within said reluctor space, said reluctor member having a left end, a right end and a plurality of alternating iron and superconducting disks, said left end and said right end of the reluctor member contacting said lower arms of the first and the second ""U""-shaped bodies;each of said superconductor disks, having an outer edge and a center portion, being constructed of a plurality of concentric rings;said plurality of rings, being arranged with a lowest transition temperature ring disposed on said outer edge, a highest transition temperature ring disposed at said center portion and a series of progressively increasing transition temperature rings disposed between said lowest transition temperature ring and said highest transition temperature ring;said reluctor member having a predetermined transition temperature lower than said ambient temperature of the flux source; andsaid reluctor member reducing said magnetic permeance of the magnetic flux below the permeance of air (1.0) but greater than 0 and increasing said reluctivity of the magnetic flux.