Magnetic components and methods of manufacturing the same

• US 9,859,043 B2
• Filed: 04/22/2010
• Issued: 01/02/2018
• Est. Priority Date: 07/11/2008
• Status: Active Grant

• Current Assignee: Eaton Intelligent Power Limited (Eaton Corporation PLC.)
• Original Assignee: Cooper Technologies Company (Eaton Corporation PLC.)
• Inventors: Yan, Yipeng, Bogert, Robert James
• Primary Examiner(s): Lian, Mangtin
• Application Number:
  US12/765,115
• Publication Number:
  US 20100271161A1
• Time in Patent Office: 2,812 Days
• Field of Search: 336192, 336200, 336212, 336222, 336223, 336232, 336234, 336221, 336233
• CPC Class Codes: H01F 1/14 metals or alloys
• CPC Class Codes: H01F 1/14758 by macromolecular organic substances
• CPC Class Codes: H01F 1/14791 Fe-Si-Al based alloys, e.g. Sendust
• CPC Class Codes: H01F 1/15375 using polymers
• CPC Class Codes: H01F 1/26 by macromolecular organic substances
• CPC Class Codes: H01F 1/37 in a bonding agent
• 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 2017/048 with encapsulating core, e.g. made of resin and magnetic powder
• CPC Class Codes: H01F 27/255 made from particles H01F27/26 takes precedence
• CPC Class Codes: H01F 27/2847 Sheets; Strips H01F27/2866 takes precedence
• CPC Class Codes: H01F 3/10 Composite arrangements of magnetic circuits
• CPC Class Codes: H01F 41/0246 Manufacturing of magnetic circuits by moulding or by pressing powder magnetic cores made by moulding or by pressing powder H01F27/255; soft magnetic particles H01F1/20, H01F1/36

Abstract

Magnetic component assemblies including moldable magnetic materials formed into magnetic bodies, at least one conductive coil, and termination features are disclosed that are advantageously utilized in providing surface mount magnetic components such as inductors and transformers.

Claims

1. An electromagnetic component assembly comprising:

at least one prefabricated conductive coil including an outer layer of bonding agent that is one of heat activated and chemically activated; and

a laminated magnetic body having distributed gap properties throughout, the laminated magnetic body formed around the at least one coil,

wherein the bonding agent couples the at least one coil to the laminated magnetic body,

wherein the laminated magnetic body comprises a plurality of stacked prefabricated layers of magnetic material pressed in surface contact with one another,

wherein each of the prefabricated layers of magnetic material comprises magnetic powder particles and a polymeric binder shaped into a thin sheet,

wherein the at least one prefabricated coil comprises a freestanding element formed apart from all of the prefabricated layers of magnetic material,

wherein two of the stacked prefabricated layers of magnetic material are positioned on opposing sides of the at least one prefabricated coil and sandwich the at least one prefabricated coil in between, and

wherein the at least one coil and laminated magnetic body define a direct current power inductor for powering an electronic device.

2. The electromagnetic component assembly of claim 1, wherein the at least one coil is further provided with a high temperature insulating material.

3. The electromagnetic component assembly of claim 1, wherein the at least one coil comprises a multi-turn wire coil.

4. The electromagnetic component assembly of claim 1, wherein the at least one coil includes one of a flat wire conductor and a round wire conductor.

5. The electromagnetic component assembly of claim 1, wherein the at least one coil comprises two or more independent coils arranged in the laminated magnetic body.

6. The electromagnetic component assembly of claim 5, wherein the two or more independent coils are arranged in the laminated magnetic body so that there is flux sharing between the two or more independent coils.

7. The electromagnetic component assembly of claim 1, wherein the laminated magnetic body is molded around the at least one coil.

8. The electromagnetic component assembly of claim 1, wherein at least two of the plurality of stacked prefabricated layers have different magnetic properties from one another.

9. The electromagnetic component assembly of claim 8, wherein at least one of the plurality of stacked prefabricated layers includes a magnetic metal powder.

10. The electromagnetic component assembly of claim 1, further comprising a shaped core piece coupled to the at least one coil, wherein the laminated magnetic body extends around the at least one coil and the shaped core, and wherein the shaped core piece is provided separately from the plurality of stacked prefabricated layers.

11. The electromagnetic component assembly of claim 1, wherein the at least one coil comprises a flexible printed circuit coil.

12. The electromagnetic component assembly of claim 11, wherein the at least one flexible printed circuit coil comprises a plurality of flexible printed circuit coils, the laminated magnetic body being formed around the plurality of flexible printed circuit coils, wherein at least two of the plurality of stacked prefabricated layers include different magnetic materials.

13. The electromagnetic component assembly of claim 11, further comprising a shaped core piece associated with the printed circuit coil, and wherein the laminated magnetic body is formed around the flexible circuit coil and the shaped core piece.

14. The electromagnetic component assembly of claim 1, wherein the at least one coil includes first and second distal ends, at least one of the first and second ends coated with an electrically conductive liquid material.

15. The electromagnetic component assembly of claim 1, wherein the at least one coil includes first and second distal ends, at least one of the first and second ends coated with an electro-deposited metal.

16. The electromagnetic component assembly of claim 1, wherein the at least one coil includes first and second distal ends, the assembly further comprising surface mount terminations provided on the laminated magnetic body and electrically connected to the respective first and second distal ends, the terminations being plated on a surface of the laminated magnetic body.

17. The electromagnetic component assembly of claim 16, wherein the plated terminations include a Ni/Sn plating.

18. The electromagnetic component assembly of claim 1, wherein the coil includes first and second distal ends each protruding from a respective face of the laminated magnetic body, the distal ends being folded against the respective face, and the distal ends being respectively connected to a conductive clip, thereby providing surface mount terminations for the assembly.

19. The electromagnetic component assembly of claim 18, the distal ends being one of welded or soldered to the respective conductive clips.

20. The electromagnetic component assembly of claim 18, wherein each conductive clip includes a through hole, and the distal ends being fastened to each clip via the through hole.

21. The electromagnetic component assembly of claim 1, wherein the at least one coil comprises a copper conductor provided with a barrier coating.

22. The electromagnetic component assembly of claim 1, further comprising a lead frame connected to the at least one coil within the laminated magnetic body, and the lead frame being cut flush to the magnetic body.

23. The electromagnetic component assembly of claim 1, wherein the at least one coil includes opposed distal ends, the distal ends of the coil being connected to a termination clip at a location interior to the laminated magnetic body.

24. The electromagnetic component assembly of claim 1, wherein the laminated magnetic body is formed from a pre-annealed magnetic amorphous metal powder combined with a polymer binder.

25. The electromagnetic component assembly of claim 1, wherein the at least one coil comprises a three dimensional element.

26. An electromagnetic component assembly comprising:

at least one prefabricated coil having a winding portion defining more than complete turn; and

a laminated magnetic body having distributed gap properties throughout, the laminated magnetic body formed around the at least one coil and comprising a plurality of stacked prefabricated layers of magnetic material each being pressed in surface contact with at least one other of the plurality of stacked prefabricated layers of magnetic material,

wherein each of the prefabricated layers of magnetic material comprises magnetic powder particles and a polymeric binder shaped into a thin sheet,

wherein the at least one prefabricated coil comprises a freestanding conductive element formed apart from all of the prefabricated layers of magnetic material,

wherein two of the stacked prefabricated layers of magnetic material are positioned on opposing sides of the at least one prefabricated coil and sandwich the at least one prefabricated coil in between, and

wherein the at least one coil and laminated magnetic body define a direct current power inductor for powering an electronic device.

27. The electromagnetic component assembly of claim 26, wherein the at least one prefabricated coil includes an outer layer of bonding agent that is one of heat activated and chemically activated.

28. The electromagnetic component assembly of claim 26, further comprising surface mount terminations provided on the laminated magnetic body.

29. The electromagnetic component assembly of claim 26, wherein the freestanding conductive element comprises one of a round wire conductor and a flat wire conductor.

30. The electromagnetic component assembly of claim 26, wherein the at least one prefabricated coil comprises a plurality of prefabricated coils spaced apart from one another in the laminated magnetic body.

31. The electromagnetic component assembly of claim 26, further comprising a prefabricated, shaped core element separately provided from the at least one prefabricated coil and the plurality of stacked prefabricated layers of magnetic material, wherein the prefabricated, shaped core element extends through the at least one prefabricated coil and is enclosed within the laminated magnetic body.