Continuous method of manufacturing wire wound inductors and wire wound inductors thereby

• US 5,867,891 A
• Filed: 12/30/1996
• Issued: 02/09/1999
• Est. Priority Date: 12/30/1996
• Status: Expired due to Term

• Current Assignee: Blackberry Limited
• Original Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Inventors: Lampe, Ross Warren Jr., Hayes, Gerard James
• Primary Examiner(s): Moon, Daniel B.
• Assistant Examiner(s): Calve, James P.
• Application Number:
  US08/775,195
• Time in Patent Office: 771 Days
• Field of Search: 29/605, 29/602.1, 29/606, 29/608, 336/233, 336/83, 336/192, 336/198
• US Class Current: 29/605
• 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 29/49071 by winding or coiling

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. A method of manufacturing inductors comprising:

(a) extruding a length of core material;

(b) subsequently forming and crimping wire staple terminals around the core material from a bendable wire material; and

(c) wrapping wire windings around the core material between the wire staple terminals and connecting the wire windings to the wire staple terminals.

2. A method according to claim 1, wherein step (a) is practiced by (d) extruding a thermoplastic material forming an arbitrary cross section and (e) feeding the extruded thermoplastic material into a core sizing station.

3. A method according to claim 2, further comprising, after step (e) and continuous with steps (a)-(d), the step of machining the core material to a desired cross section in accordance with a desired inductance.

4. A method according to claim 1, further comprising, prior to step (b), the step of forming notches in the core material, wherein step (b) is practiced by securing the wire staple terminals in the notches.

5. A method according to claim 1, wherein step (b) is practiced by uncoiling a section of spooled wire, shearing the section, shaping the wire to fit around the core material, and crimping the wire around the core material, thereby forming the inductor terminals.

6. A method according to claim 1, wherein step (c) is practiced by connecting the wire windings to the wire staple terminals at selected locations about the perimeter of the core material in accordance with a desired inductance.

7. A method according to claim 1, wherein step (c) is practiced by (f) soldering the wire windings to the wire staple terminals.

8. A method according to claim 7, wherein step (f) is practiced by heat and pressure staking.

9. A method according to claim 7, wherein step (f) is practiced by welding.

10. A method according to claim 1, further comprising (g) applying a coating material over the wire windings between the wire staple terminals.

11. A method according to claim 10, wherein step (g) is practiced by coating a UV curable material over the wire windings between the wire staple terminals.

12. A method according to claim 10, further comprising separating individual inductors from one another along the length of core material.

13. A method according to claim 12, further comprising testing the individual inductors for electrical performance and sorting the individual inductors in accordance with a tolerance deviation.

14. A method according to claim 1, further comprising separating individual inductors from one another along the length of core material.

15. A method according to claim 14, further comprising testing the individual inductors for electrical performance and sorting the individual inductors in accordance with a tolerance deviation.

16. A method of manufacturing inductors comprising:

(a) extruding a length of core material sufficient for a plurality of inductors;

(b) subsequently forming and crimping wire staple terminals from a bendable wire material around the core material along the length of core material in locations corresponding to the plurality of inductors; and

(c) wrapping wire windings around the core material between the wire staple terminals and connecting ends of the wire windings to pairs of the wire staple terminals corresponding to each of the plurality of inductors, respectively.

17. A method according to claim 16, wherein step (a) is practiced by (d) extruding a thermoplastic material forming an arbitrary cross section and (e) feeding the extruded thermoplastic material into a core sizing station.

18. A method according to claim 17, further comprising, after step (e) and continuous with steps (a)-(d), the step of machining the core material to a desired cross section in accordance with a desired inductance.

19. A method according to claim 16, further comprising, prior to step (b), the step of forming notches in the core material, wherein step (b) is practiced by securing the wire staple terminals in the notches.

20. A method according to claim 16, wherein step (b) is practiced by uncoiling a section of spooled wire, shearing the section, shaping the wire to fit around the core material, and crimping the wire around the core material, thereby forming the inductor terminals.

21. A method according to claim 16, wherein step (c) is practiced by connecting the wire windings to the wire staple terminals at selected locations about the perimeter of the core material in accordance with a desired inductance.

22. A method according to claim 16, wherein step (c) is practiced by (f) soldering the wire windings to the wire staple terminals.

23. A method according to claim 22, wherein step (f) is practiced by heat and pressure staking.

24. A method according to claim 22, wherein step (f) is practiced by welding.

25. A method according to claim 16, further comprising (g) applying a coating material over the wire windings between the wire staple terminals.

26. A method according to claim 25, wherein step (g) is practiced by coating a UV curable material over the wire windings between the wire staple terminals.

27. A method according to claim 16, further comprising separating individual inductors from one another along the length of core material.

28. A method according to claim 27, further comprising testing the individual inductors for electrical performance and sorting the individual inductors in accordance with a tolerance deviation.