Winding support and method for NMR magnet axisymmetric correction coils
AssigneeGeneral Electric Company
InventorMark E. Vermilyea
Life of this patent
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Abstract
A coil form for supporting both symmetric and antisymmetric magnetic field correction coils includes a system or circumferential slots and axial grooves disposed at various depths in the form to achieve the desired winding pattern. A winding method for this coil form is provided in which tension in the winding conductor, preferably a superconductive material, is maintainable at all times during assembly, and increased upon immersion in cryogenic fluid. Accordingly, the coil form and winding method provide a means for constructing axisymmetric coils which are resistant to frictional motion and which may be placed in direct contact with cryogenic fluids.
Claims22
A coil form, especially for supporting superconductive windings for axial NMR magnetic field correction coils, said form comprising:
- an insulative cylinder;
- said cylinder having at least two circumferential slots therein at a depth of approximately h from the surface of said cylinder;
- said cylinder also having a first axial groove therein at a depth of approximately h+d from the surface of said cylinder, said groove extending at this depth for a substantial portion of the length of said first groove, said first axial groove extending between said circumferential slot, said first axial groove also having two ramped transition portions from the depth of said first groove to the depth of said circumferential slots, said ramped transition portions each being disposed adjacent to one of said circumferential slots, said coil forms also exhibiting two rounded corners at the junction of said first axial groove and said circumferential slots;
- said cylinder also having a second axial groove therein at a depth of approximately h+d from the surface of said cylinder, said second axial groove extending at this depth for a substantial portion of the length of said second groove, said second axial groove extending at said depth of h+d across all of a first one of said circumferential slots, said second axial groove extending at said depth of h+d across almost all of the second of said circumferential slots, said second axial groove also having a ramped transition portion from the depth of said second groove to the depth of the second of said circumferential slot, said ramped portion extending in the circumferential direction, said coil form also exhibiting a rounded corner at the junction of said second axial groove and the ramped portion of said second axial groove at the point where said second axial groove changes direction.
A method for winding axial coil pairs on a cylindrical coil form so that tension in the conductor of said coil is maintainable during assembly, said coil winding method comprising:
- (a) laying said conductor in a first axial groove which extends from one end of said coil form, across a first circumferential slot in said coil form, and across almost all of a second circumferential slot in said form;
- (b) bending said wire around a first rounded corner in said form at the end of said first axial groove so that said conductor is oriented in a circumferential direction;
- (c) winding said conductor in said circumferential direction from step (b) so as to fill said second circumferential slot;
- (d) bending said conductor around a second rounded corner in said coil form so that said conductor is oriented in an axial direction toward said circumferential slot;
- (e) laying said conductor in a second axial groove extending between said first and second circumferential slots;
- (f) bending said conductor around a third rounded corner in said coil form at the end of said second circumferential groove, so that said conductor is oriented in a circumferential direction;
- (g) winding said conductor in said circumferential direction from step (f) so as to fill said first circumferential slot;
- (h) bending said conductor around a fourth rounded corner in said coil form so that said conductor is oriented in an axial direction;
- and
- (i) laying said conductor in a third axial groove extending from said first circumferential slot to the end of said coil form approximal to said first circumferential slot.
Dependencies are inferred from the claim text.