US 11,990,268 B2
Transformer comprising winding
Seyed Ali Mousavi, Västerås (SE); Göran Eriksson, Västerås (SE); Manoj Pradhan, Västerås (SE); and Anders Daneryd, Västerås (SE)
Assigned to HITACHI ENERGY LTD, Zurich (CH)
Appl. No. 18/034,542
Filed by HITACHI ENERGY LTD, Zürich (CH)
PCT Filed Feb. 4, 2022, PCT No. PCT/EP2022/052787
§ 371(c)(1), (2) Date Apr. 28, 2023,
PCT Pub. No. WO2022/167622, PCT Pub. Date Aug. 11, 2022.
Claims priority of application No. 21155612 (EP), filed on Feb. 5, 2021.
Prior Publication US 2023/0395315 A1, Dec. 7, 2023
Int. Cl. H01F 27/28 (2006.01); H01F 27/36 (2006.01); H01F 27/34 (2006.01)
CPC H01F 27/366 (2020.08) [H01F 27/2828 (2013.01); H01F 27/2885 (2013.01); H01F 2027/348 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A transformer comprising:
a core; and
at least one winding wound around a winding axis extending along a limb of the core, said winding terminating in an axial end surface extending in a direction perpendicular to said winding axis, said transformer comprising a ring comprising magnetic material, said ring being located outside said winding and adjacent to said axial end surface, wherein a projection of said ring, along said winding axis, onto said winding, covers at least a part of, preferably all of, said axial end surface,
wherein the core comprises a yoke, said yoke extending radially across the ring, at one or more crossing locations, from a radial inside of the ring to a radial outside of the ring, wherein said ring comprises a set of magnetic metal components, said magnetic metal components being distributed about the winding axis and electrically insulated from each other, wherein heights along the winding axis of respective ones of the magnetic metal components varies about the winding axis such that magnetic metal components at the crossing location(s) have lower height along the winding axis than the heights of magnetic metal components further away from the crossing location(s).