US 11,944,979 B2
Magnetic field gradient apparatus and apparatus for separation
Marc Maria Jozef Dhallé, Enschede (NL); and Jaap Jeroen Kosse, Slagharen (NL)
Assigned to Urban Mining Corp B.V.
Appl. No. 17/911,442
Filed by Urban Mining Corp B.V, Rotterdam (NL)
PCT Filed Mar. 16, 2021, PCT No. PCT/NL2021/050176
§ 371(c)(1), (2) Date Sep. 14, 2022,
PCT Pub. No. WO2021/187976, PCT Pub. Date Sep. 23, 2021.
Claims priority of application No. 2025139 (NL), filed on Mar. 16, 2020.
Prior Publication US 2023/0108019 A1, Apr. 6, 2023
Int. Cl. B03C 1/033 (2006.01); B03C 1/0355 (2006.01); H01F 6/06 (2006.01); H10N 60/85 (2023.01)
CPC B03C 1/0337 (2013.01) [B03C 1/0355 (2013.01); H01F 6/06 (2013.01); H10N 60/857 (2023.02)] 28 Claims
OG exemplary drawing
 
1. A magnetic field gradient apparatus, especially a unidirectional magnetic field gradient apparatus, for generating a magnetic field having a magnetic field gradient in a direction perpendicular to a first plane defined by a first axis and a second axis transverse to the first axis, wherein the first axis and the second axis are in the first plane, and the magnetic field is obtained by having a current distribution of a current in the first plane with a current direction of the current distribution alternating between opposite directions parallel to the second axis with a period λ along the first axis, and wherein the magnet apparatus comprises:
leg sections extending along the second axis and arranged besides each other along the first axis, wherein a distance (d) between adjacent leg sections is λ/6, and a width of a leg section having an adjacent leg section on either side is λ/3, as seen along the first axis, wherein the leg sections comprise a conductor for the current; and
a controller configured to control current through the respective leg sections,
wherein the leg sections and the controller are arranged to provide a current direction in adjacent leg sections in opposite directions to obtain the current direction of the current distribution alternating between opposite directions parallel to the second axis with the period λ along the first axis.