Patent ID: 9129735
Filing Date: 2015-09-08
Classification: H01F,Y10T

Abstract:
1. A transformer comprising: a transformer body comprising: a casting case that houses the transformer body, the case being casted using a mold core; and a mold resin filling a clearance between the case and the transformer body, wherein the case comprises: wherein the mold core has a draft and includes side surfaces that extend along a vertical direction of the mold core, the side surfaces of the mold core defining an inner wall forming section for forming an inner wall surface of the side wall, the inner wall forming section being free of a draft that is inclined relative to a direction of a long side of the mold core and free of a draft that is inclined relative to the vertical direction of the mold core, the inner wall surface of the side wall being transcribed with any corresponding draft of the mold core, wherein a thickness of a mold layer provided in the clearance between the inner wall surface of the side wall and an opposed surface of the transformer body closely opposed to the inner wall surface is constant for a predetermined length from a point at or near the opening of the case toward the attachment face portion, and wherein a casting surface on an inner surface of the attachment face portion includes a core mount surface that is cut to have a predetermined surface roughness, the core mount surface being configured to be in contact with the core.