Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Superconductive type
Patent
1995-10-04
1998-01-13
Spyrou, Cassandra C.
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Superconductive type
505705, 505879, H01F 502, H01F 506, H01F 508
Patent
active
057084050
ABSTRACT:
A superconducting coil bas a winding wire portion which is formed by winding a superconducting wire covered with an insulating material around a winding frame composed of such a material that its modulus of longitudinal elasticity is 50 (GPa) or greater, and its thermal contraction rate between a room temperature and a temperature of 77 (K) is 0.35% or above while applying a tensile force thereto, and a bonding material impregnated between the superconducting wires and is then solidified by a heat treatment to reduce a contact surface pressure between the winding wire portion and the winding frame, preventing transition to a normal conductive state.
A method for manufacturing superconducting coil having a step of forming a winding wire portion by winding a winding frame with insulation superconducting wires in a plurality of lines and in a plurality of layers while applying a tensile force thereto, the method includes a step of setting a winding tensile force of the insulation superconducting wires larger in intermediate through external layers apart from the winding frame than in an internal layer close to the winding frame or a step of forming a non-acute angled cavity between the curved surfaces to restrain the occurrences of a crack and the exfoliation of the winding wire portion and generation of quench due to the electromagnetic force when exciting the coil.
REFERENCES:
Excerpt of US 4195607.
Hatano Hiroshi
Hirumachi Tamiko
Kobayashi Takayuki
Mine Susumu
Mitsui Hisayasu
Barrera Raymond
Kabushiki Kaisha Toshiba
Spyrou Cassandra C.
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