Method for making a high current, low profile inductor

• US 6,460,244 B1
• Filed: 04/11/2000
• Issued: 10/08/2002
• Est. Priority Date: 07/18/1995
• 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., Jelkin, Brett W.
• Primary Examiner(s): Vo, Peter
• Assistant Examiner(s): TRINH, MINH N
• Application Number:
  US09/547,155
• Time in Patent Office: 910 Days
• Field of Search: 296/08, 296/021, 296/05, 295/921, 298/83, 296/06, 29D/IG.31, 336/83, 336/96, 336/200, 336/233, 336/175, 336/90, 333/81.R, 752/34, 752/36, 148/104, 148/306, 419/10, 419/38
• US Class Current: 29/608
• CPC Class Codes: H01F 17/04 with magnetic core
• CPC Class Codes: H01F 2017/046 helical coil made of flat wire, e.g. with smaller extension of wire cross section in the direction of the longitudinal axis
• CPC Class Codes: H01F 37/00 Fixed inductances not covered by group H01F17/00
• CPC Class Codes: H01F 41/046 structurally combined with ferromagnetic material
• CPC Class Codes: Y10T 29/49002 Electrical device making
• CPC Class Codes: Y10T 29/4902 Electromagnet, transformer or inductor
• CPC Class Codes: Y10T 29/49071 by winding or coiling
• CPC Class Codes: Y10T 29/49076 From comminuted material
• CPC Class Codes: Y10T 29/4922 with molding of insulation

Abstract

A method for making a high current, low profile inductor includes a wire coil having an inter coil end and an outer coil end. A magnetic material completely surrounds the wire coil to form an inductor body. First and second leads connected to the inner coil end and the outer coil end respectively extend through the magnetic material to the exterior of the inductor body. The method of operation involves pressure molding the magnetic material around the wire coil.

Claims

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

forming a conductive coil having an inner coil end, an outer coil end, a plurality of coil turns, and a hollow core;

attaching first and second leads to said inner and outer coil ends respectively, said first and second leads having first and second free ends respectively;

pressure molding a powdered magnetic material within said hollow core and completely around said coil so that said powdered magnetic material is substantially free from voids therein and is compressed tightly around and in contact with said conductive coil, as to create an inductor body, said free ends of said first and second leads extending outside said inductor body.

2. A method according to claim 1 wherein said pressure molding is accomplished at a pressure of from 15 to 20 tons per square inch.

3. A method according to claim 2 and further comprising forming said powdered magnetic material by mixing a first powdered iron and a second powdered iron together, said first and second powdered irons having different electrical characteristics.

4. A method according to claim 3 further comprising mixing a filler, a resin, and a lubricant with said first and second powdered irons before said pressure molding step.

5. A method according to claim 1 and further comprising applying a bonding material to said coil during said forming step so that the turns of said coil are adhered to open another.