Magnetic core inductor

• US 4,833,437 A
• Filed: 03/18/1988
• Issued: 05/23/1989
• Est. Priority Date: 07/21/1986
• Status: Expired due to Term

• Current Assignee: TACNA International Corp.
• Original Assignee: Williamson Windings, Inc.
• Inventors: Williamson, James A.
• Primary Examiner(s): Kozma, Thomas J.
• Application Number:
  US07/169,738
• Time in Patent Office: 431 Days
• Field of Search: 336/223, 336/222, 336/192, 336/83, 336/212, 336/180, 336/181, 336/182, 336/183, 336/229, 336/186
• US Class Current: 336/192
• CPC Class Codes: H01F 27/2852 Construction of conductive connections, of leads
• CPC Class Codes: H01F 27/29 Terminals; Tapping arrangements for signal inductances
• CPC Class Codes: H01F 37/00 Fixed inductances not covered by group H01F17/00

Abstract

A winding for a magnetic core is preformed as a flat conducting strip disposed in a helical coil configuration of circular shape, having elongated integral tabs at selectible angles to the coil from substantially tangential to substantially radial orientation for cooperation with the magnetic core exit slots, thereby maximizing core window utilization and adapting to conventional cores. The cross sectional area of the tabs is less than the cross sectional area of helix turns thereby further eliminating interference with smaller core exit slots.

Claims

1. A magnetic core inductor comprising in combination:

a core comprising a substantially closed magnetic path about a core window;

a continuous, monolithic helix coil of insulated flat metal ribbon having a width greater than the thickness and forming at least two insulated stacked turns having a first integral end, a second integral end and a central opening;

said central opening of said coil being provided to receive a central leg of said magnetic core, each of said first and second integral ends comprising respective elongated integral tabs,

each said turn being uniformly coated with an insulating envelope to comprise said insulated turns;

said core having at least two outer legs, each outer leg having an inner portion thereof bordered by vertical edges, said inner portions facing said central leg in opposing relation to receive the outer perimeter of said helix coil, said opposing vertical edges forming the side borders of the core window through which said elongated integral tabs exit said core and said coil normal to the plane of said window, said elongated tabs being parallel and offset inwardly from a direction tangential to said coil central opening;

each end of said coil comprising an unwound elongated integral tab exiting said helix coil in said direction offset inwardly from said direction tangential to said central opening;

the offset position of the tabs locates the inner edges of said elongated tabs, which edges, if extended, in the direction of said coil central opening define chords of the coil central opening rather than tangents to said central opening

each of said elongated tabs has a deceased width and cross sectional area relative to the width and cross sectional area of the turns, and,

said helix coil being compact, comprising n+1 turns but characterized by a height substantially equal to the height of a similar uncompacted coil of n turns.

2. The magnetic core inductor of claim 1 wherein

each of said inner portions of said outer leg is characterized by a concentric surface relative to said central opening of said coil.

3. The magnetic core inductor of claim 1 wherein each of said outer legs is characterized by a rectangular cross section.