Method for making inductor coil structure

• US 6,449,829 B1
• Filed: 04/10/2000
• Issued: 09/17/2002
• Est. Priority Date: 03/16/1999
• Status: Expired due to Term

• Current Assignee: Vishay Dale Electronics (Vishay Intertechnology Incorporated)
• Original Assignee: Vishay Dale Electronics (Vishay Intertechnology Incorporated)
• Inventors: Shafer, Timothy M.
• Primary Examiner(s): Vo, Peter
• Assistant Examiner(s): TRINH, MINH N
• Application Number:
  US09/546,859
• Time in Patent Office: 890 Days
• Field of Search: 296/021, 298/35, 296/05, 336/200, 336/232, 336/223, 336/225, 336/192, 336/96, 336/83
• US Class Current: 29/602.1
• CPC Class Codes: B29C 43/003 characterised by the choice of material
• CPC Class Codes: B29C 43/18 incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles B29C43/206 takes precedence
• CPC Class Codes: B29K 2303/06 Metal powders, metal carbides or the like
• CPC Class Codes: H01F 17/04 with magnetic core
• CPC Class Codes: H01F 2027/2861 Coil formed by folding a blank
• CPC Class Codes: H01F 27/2847 Sheets; Strips H01F27/2866 takes precedence
• CPC Class Codes: H01F 27/292 Surface mounted devices
• CPC Class Codes: H01F 41/04 for manufacturing coils coils for transformer or inductances H01F27/28
• CPC Class Codes: Y10T 29/4902 Electromagnet, transformer or inductor
• CPC Class Codes: Y10T 29/49071 by winding or coiling
• CPC Class Codes: Y10T 29/49135 and shaping, e.g., cutting or bending, etc.
• CPC Class Codes: Y10T 29/49146 with encapsulating, e.g., potting, etc.

Abstract

method for making a high current, low profile inductor includes taking an elongated plate, cutting a plurality of slots in the sides of the plate so as to form a plurality of cross segments extending transversely with respect to the length of the plate and a plurality of connecting segments extending approximately axially with respect to the longitudinal axis of the plate. The method further requires bending the segments transversely with respect to the plate axis so as to place the opposite flat surfaces of the cross segments in planes parallel to one another and facing in an axial direction with respect to the longitudinal plate axis.

Claims

1. A method for making a high current low profile inductor comprising:

taking an elongated plate conductor having a first end, a second end, opposite side edges, opposite flat surfaces, and a longitudinal plate axis;

cutting a plurality of slots in each of said opposite side edges of said plate conductor so as to form said plate conductor into a plurality of cross segments extending transversely with respect to said plate axis and a plurality of connecting segments extending approximately axially with respect to said plate axis, said connecting segments connecting said cross segments together into a continuous conductor which extends in a sine shaped path;

said cross segments each having opposite flat surfaces formed from said opposite surfaces of said plate conductor;

bending said connecting segments transversely with respect to said plate axis so as to form said plate conductor into a plurality of accordion folds, each of which comprise one of said cross segments and a portion of one of said connecting segments, whereby said cross segments and said connecting segments form a continuous conductor coil formed into an approximate helical shape and having first and second opposite ends;

said bending step being done so as to place said opposite flat surfaces of said cross segments in planes parallel to one another and perpendicular to said longitudinal plate axis.

2. The method according to claim 1 and further comprising surrounding said conductor coil with a magnetic material to create an inductor body.

3. The method according to claim 2 and further comprising compressing said inductor body with compressive forced of from 15 to 25 tons per square inch so as to increase the density of said magnetic material.