Wire wound inductors

• US 5,903,207 A
• Filed: 12/30/1996
• Issued: 05/11/1999
• Est. Priority Date: 12/30/1996
• Status: Expired due to Term

• Current Assignee: Blackberry Limited
• Original Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Inventors: Hayes, Gerard James, Lampe, Ross Warren Jr.
• Primary Examiner(s): Kozma, Thomas J.
• Application Number:
  US08/775,196
• Time in Patent Office: 862 Days
• Field of Search: 336/192, 336/198, 336/208, 336/205, 338/332, 338/322, 338/324, 338/329
• US Class Current: 336/192
• CPC Class Codes: H01F 27/027 specially adapted for combination of signal type inductors or transformers with electronic circuits, e.g. mounting on printed circuit boards
• 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

Abstract

A wire-wound inductor includes a dielectric core, terminals including wire staples that are crimped around the core, and a wire winding disposed about the perimeter of the core and connected to the terminals. A coating such as an adhesive coating is disposed over the wire winding and between the terminals. The process for manufacturing the inductors in a continuous process. Beginning with a spooled material, which may be extruded, inductors are formed on a core material sequentially. The inductors are not physically separated until the final stages of manufacturing, which is in contrast to the prior art method in which each inductor is individually constructed on an individual core that has been manufactured with tight tolerances and wound individually. By virtue of the characteristics of the inductor components, extremely tight tolerances (typically about 0.0005") can be obtained, resulting in highly controlled inductance values.

Claims

1. An inductor comprising:

a generally rectangular shaped dielectric core, said core having a top, sides substantially perpendicular to said top, and a bottom substantially parallel to said top;

terminals including wire staples having a standard substantially rounded cross-section, said staples being bent around said sides of said core and being crimped about said bottom of said core, wherein the cross-section of said staples at said bottom of said core is flattened relative to the rest of said staples.

2. An inductor according to claim 1, further comprising a coating disposed over said wire winding and between said terminals.

3. An inductor according to claim 2, wherein said wire staples extend out from said dielectric core defining a well therebetween, said coating being disposed in said well.

4. An inductor according to claim 2, wherein said coating is an adhesive coating.

5. An inductor according to claim 1, further comprising a magnetic core disposed inside of said dielectric core.

6. An inductor according to claim 1, wherein said dielectric core is formed of a thermoplastic material having a melting temperature above 350°

F.

7. An inductor according to claim 6, wherein said dielectric core is formed of a thermoplastic material having a melting temperature above 650°

F.

8. An inductor according to claim 1, wherein said dielectric core comprises notches formed in the perimeter thereof, said wire staples being disposed in said notches.

9. An inductor according to claim 1, wherein said wire staples are formed from a spooled material.

10. An inductor according to claim 9, wherein said spooled material comprises tinned-copper.

11. An inductor according to claim 1, wherein the inductor is a surface mount part for mounting to a PCB, said wire staples extending out from a PCB side of said dielectric core.

12. An inductor according to claim 1, wherein said wire winding is secured at selected locations about the perimeter of said core in accordance with a desired inductance.

13. An inductor according to claim 1, wherein said dielectric core comprises an extruded dielectric core.