Patent ID: 6232865
Filing Date: 2001-05-15
Classification: H01F

Abstract:
A tubular core comprising:a central axis for a controllable inductor with a main winding surrounding the core and a control winding passing axially through said core, said core for receiving a magnetic flux from said main winding and extending axially therethrough comprising a hollow envelope that is cylindrical in shape and has a cylindrical outer wall; anda number of magnetically permeable core rings, each of said rings having a cylindrical inner wall and annular ends located opposite one another;said core rings being stacked co-axially on top of each other and having a space between each of said stacked rings,said envelope and adjacent ends of the core rings being disposed in confronting abutting contact;said envelope and said stacked core rings being connected to each other forming a wall with the annular ends forming joints between the core rings in the axial direction;said joints being overlapped by a portion of said envelope continuously extending axially across each joint; anda cured, electrically insulating layer formed of a binding agent is arranged in said spacing between said stacked core rings.