Magnetic electrical device

• US 8,378,777 B2
• Filed: 07/29/2008
• Issued: 02/19/2013
• Est. Priority Date: 07/29/2008
• 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): Musleh, Mohamad
• Assistant Examiner(s): LIAN, MANG TIN BIK
• Application Number:
  US12/181,436
• Publication Number:
  US 20100026443A1
• Time in Patent Office: 1,666 Days
• Field of Search: 336/200, 336/192, 336/223, 336/232, 336/233, 336/234
• US Class Current: 336/234
• CPC Class Codes: H01F 17/0013 with stacked layers
• CPC Class Codes: H01F 17/0033 with the coil helically wound around a magnetic core
• CPC Class Codes: H01F 2017/006 flexible printed inductors
• CPC Class Codes: H01F 2017/0066 with a magnetic layer
• CPC Class Codes: H01F 27/245 made from sheets, e.g. grain-oriented H01F27/26 takes precedence
• CPC Class Codes: H01F 27/2847 Sheets; Strips H01F27/2866 takes precedence
• CPC Class Codes: H01F 27/2866 Combination of wires and sheets
• CPC Class Codes: H01F 27/29 Terminals; Tapping arrangements for signal inductances
• CPC Class Codes: H01F 27/292 Surface mounted devices
• CPC Class Codes: H01F 27/30 Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
• CPC Class Codes: H01F 41/041 Printed circuit coils apparatus or processes for manufacturing printed circuits in general H05K3/00
• CPC Class Codes: Y10T 29/4902 Electromagnet, transformer or inductor
• CPC Class Codes: Y10T 29/49071 by winding or coiling
• CPC Class Codes: Y10T 29/49073 by assembling coil and core
• CPC Class Codes: Y10T 29/49075 including permanent magnet or core

Abstract

A magnetic component and a method for manufacturing a low profile, magnetic component. The method comprises the steps of providing at least one sheet, coupling at least a portion of at least one winding to the at least one sheet, and laminating the at least one sheet with at least a portion of the at least one winding. The magnetic component comprises at least one sheet and at least a portion of at least one winding coupled to the at least one sheet, wherein the at least one sheet is laminated to at least a portion of the at least one winding. The winding may comprise a clip, a preformed coil, a stamped conductive foil, or an etched trace using chemical or laser etching. The sheet may comprise any material capable of being laminated and/or rolled, including, but not limited to, flexible magnetic powder sheets.

Claims

1. An electromagnetic component, comprising:

a plurality of flexible magnetic powder sheets, wherein each of the plurality of flexible magnetic powder sheets is substantially planar and capable of being laminated to adjacent ones of the plurality of flexible magnetic powder sheets when arranged in a stack;

at least one preformed multiple turn conductive winding separately fabricated and separately provided from all of the plurality of flexible magnetic powder sheets, wherein at least one of the plurality of flexible magnetic powder sheets is pressed directly to and around the at least one multiple turn preformed conductive winding to define a magnetic core area for the at least one multiple turn preformed conductive winding, wherein at least two of the plurality of flexible magnetic powder sheets are disposed adjacent to the at least one preformed multiple turn conductive winding without a physical gap being formed adjacent the at least one preformed conductive winding; and

at least a first terminal on a first one of the plurality of flexible magnetic powder sheets and at least a second terminal on a second one of the plurality of flexible magnetic powder sheets.

2. The electromagnetic component of claim 1, wherein the at least one preformed multiple turn conductive winding comprises an elongated, flexible and freestanding wire conductor including a first lead, a second lead, and an axial length therebetween, the axial length being curved into a coil.

3. The electromagnetic component of claim 1, wherein the first and second terminals span an entire length of the first and second ones of the flexible magnetic powder sheets.

4. The electromagnetic component of claim 1, wherein each of the first and second terminals are connected by a plurality of vias.

5. The electromagnetic component of claim 1, wherein the at least one preformed multiple turn conductive winding comprises a wire conductor wound into a coil and having first and second leads, and wherein one of the first and second conductive leads is attached to the first terminal.

6. The electromagnetic component of claim 3, wherein the second terminal defines a surface mount termination for the electromagnetic component.

7. The electromagnetic component of claim 1, wherein the stacked flexible magnetic powder sheets form a generally rectangular shape.

8. The electromagnetic component of claim 1, wherein the electromagnetic component is a miniature power inductor.

9. The electromagnetic component of claim 1, wherein at least one of the plurality of flexible magnetic powder sheets comprises magnetic metal powders mixed with a thermoplastic resin.

10. The electromagnetic component of claim 9, wherein all of the plurality of flexible magnetic powder sheets comprise magnetic metal powders mixed with a thermoplastic resin.

11. The electromagnetic component of claim 1, wherein the at least one preformed multiple turn conductive winding is configured to generate at least one magnetic field in a predetermined direction when electrical current flows through the winding.

12. The electromagnetic component of claim 11, wherein the at least one magnetic field is oriented in a vertical direction.

13. The electromagnetic component of claim 1, wherein the at least one preformed multiple turn conductive winding comprises a plurality of turns that are concentrically wound.

14. The electromagnetic component of claim 1, wherein the at least one preformed multiple turn conductive winding comprises a plurality of turns defining a curvilinear spiral path.

15. The electromagnetic component of claim 1, wherein the at least one preformed multiple turn conductive winding comprises a plurality of turns extending generally coplanar to one another.

16. The electromagnetic component of claim 1, wherein the at least one preformed multiple turn conductive winding is configured to provide a selected amount of inductance to the completed electromagnetic component when electrical current flows through the conductive winding.

17. The electromagnetic component of claim 16, wherein the at least one preformed multiple turn conductive winding comprises a single preformed conductive winding, and wherein the magnetic core area contains only the single preformed conductive winding.

18. The electromagnetic component of claim 16, wherein the multiple turn coil comprises a single preformed conductive winding, and wherein the magnetic core area contains only the single preformed conductive winding.

19. The electromagnetic component of claim 1, wherein one of the first and second terminals is internal to the stack of magnetic sheets and the other of the first and second terminals is located external to the stack of magnetic sheets.

20. The electromagnetic component of claim 1, wherein the at least one preformed multiple turn conductive winding is sandwiched between adjacent ones of the plurality of flexible magnetic powder sheets.

21. The electromagnetic component of claim 1, wherein the at least one preformed multiple turn conductive winding extends entirely between a first surface of a first one of the plurality of flexible magnetic powder sheets and a second first surface of a first one of the plurality of flexible magnetic powder sheets, and wherein a portion of the first and second surfaces of the respective first and second ones of the plurality of flexible magnetic powder sheets are pressed in direct surface contact with one another around the preformed multiple turn conductive winding.

22. The electromagnetic component of claim 1, wherein the at least one preformed multiple turn conductive winding includes an upper outer surface and a lower outer surface opposing the upper outer surface, the upper outer surface being in surface contact with a first one of the plurality of flexible magnetic powder sheets, the lower outer surface being in surface contact with a second one of the plurality of flexible magnetic powder sheets, and at least a portion of the first and second one of the plurality of stacked flexible sheet layers are in direct surface engagement with one another.

23. An electromagnetic component, comprising:

a plurality of flexible magnetic powder sheets, wherein the flexible magnetic powder sheets are provided in substantially planar form and are capable of being laminated to adjacent ones of the plurality of flexible magnetic powder sheets when arranged in a stack;

at least one preformed multiple turn conductive winding separately fabricated and separately provided from all of the plurality of flexible magnetic powder sheets, wherein the plurality of flexible magnetic powder sheets are laminated in surface contact with one another and at least one of the plurality of flexible magnetic powder sheets is laminated in surface contact with the at least one preformed multiple turn conductive winding to enclose the at least one preformed multiple turn conductive winding and define a magnetic core area therefore wherein at least two of the flexible magnetic powder sheets are disposed adjacent to and in surface contact with the at least one preformed multiple turn conductive winding without a physical gap extending between the at least two flexible magnetic powder sheets and the at least one preformed conductive winding; and

at least a first terminal on a first one of the plurality of flexible magnetic powder sheets and at least a second terminal on a second one of the plurality of flexible magnetic powder sheets.

24. The electromagnetic component of claim 23, wherein the at least one preformed multiple turn conductive winding comprises an elongated, flexible and freestanding wire conductor including a first lead, a second lead, and an axial length therebetween, the axial length being curved into a coil.

25. The electromagnetic component of claim 23, wherein the first and second terminals span an entire length of the first and second flexible magnetic powder sheets.

26. The electromagnetic component of claim 23, wherein each of the first and second terminals are connected by a plurality of vias.

27. The electromagnetic component of claim 23, wherein the at least one preformed multiple turn conductive winding comprises a wire conductor wound into a coil and having first and second leads, and wherein one of the first and second conductive leads is attached to the first terminal.

28. The electromagnetic component of claim 27, wherein the second terminal defines a surface mount termination for the electromagnetic component.

29. The electromagnetic component of claim 23, wherein the stacked flexible magnetic powder sheets form a generally rectangular shape.

30. The electromagnetic component of claim 23, wherein the electromagnetic component is a miniature power inductor.

31. The electromagnetic component of claim 23, wherein at least one of the plurality of flexible magnetic powder sheets comprises magnetic metal powders mixed with a thermoplastic resin.

32. The electromagnetic component of claim 31, wherein all of the flexible magnetic powder sheets comprises magnetic metal powders mixed with a thermoplastic resin.

33. The electromagnetic component of claim 23, wherein the at least one preformed multiple turn conductive winding is configured to generate at least one magnetic field in a predetermined direction when electrical current flows through the winding.

34. The electromagnetic component of claim 33, wherein the at least one magnetic field is oriented in a vertical direction.

35. The electromagnetic component of claim 23, wherein the at least one preformed multiple turn conductive winding defines a plurality of turns that are concentrically wound.

36. The electromagnetic component of claim 23, wherein the at least one preformed multiple turn conductive winding defines a curvilinear spiral path.

37. The electromagnetic component of claim 23, wherein the at least one preformed multiple turn conductive winding defines plurality of turns extending generally coplanar to one another.

38. The electromagnetic component of claim 23, wherein the at least one preformed multiple turn conductive winding is configured to provide a selected amount of inductance to the completed electromagnetic component when electrical current flows through the conductive winding.

39. The electromagnetic component of claim 38, wherein the at least one preformed multiple turn conductive winding comprises a single preformed conductive winding, and wherein the magnetic core area contains only the single preformed conductive winding.

40. The electromagnetic component of claim 23, wherein the at least one preformed multiple turn winding includes an open center, and at least two of the plurality of flexible magnetic powder sheets are laminated in surface contact with one another in the open center.

41. An electromagnetic component comprising:

a laminated structure comprising;

a plurality of stacked magnetic powder layers joined to one another;

a multiple turn coil surrounded by the joined magnetic powder layers, the coil being separately provided from and fabricated independently from all of the plurality of stacked magnetic powder layers;

wherein at least some of the magnetic powder layers are flexibly pressed around an outer surface of the multiple turn coil to form a magnetic core structure around the multiple turn coil without a physical gap; and

at least a first terminal on a first one of the plurality of stacked magnetic powder layers and at least a second terminal on a second one of the plurality of stacked magnetic powder layers.

42. The electromagnetic component of claim 41, wherein at least one of the plurality of flexible magnetic powder layers comprises magnetic metal powders mixed with a thermoplastic resin.

43. The electromagnetic component of claim 42, wherein all of the plurality of flexible magnetic powder layers comprise magnetic metal powders mixed with a thermoplastic resin.

44. The electromagnetic component of claim 41, wherein the laminated structure defines a miniature power inductor.

45. The electromagnetic component of claim 41, further comprising terminals for connecting the multiple turn coil to a circuit board.

46. The electromagnetic component of claim 41, wherein the multiple turn coil is configured to generate a magnetic field in a predetermined direction when electrical current flows through the coil.

47. The electromagnetic component of claim 46, wherein the at least one magnetic field is oriented in a vertical direction.

48. The electromagnetic component of claim 41, wherein the multiple turn coil comprises a plurality of turns that are concentrically wound.

49. The electromagnetic component of claim 41, wherein the multiple turn coil comprises a plurality of turns defining a curvilinear spiral path.

50. The electromagnetic component of claim 41, wherein the multiple turn coil defines a plurality of turns extending generally coplanar to one another.

51. The electromagnetic component of claim 41, wherein the multiple turn coil is configured to provide a selected amount of inductance to the completed electromagnetic component when electrical current flows through the coil.

52. The electromagnetic component of claim 41, wherein the multiple turn coil resides entirely between a first one and a second one of the plurality of flexible magnetic powder sheets in the plurality of stacked magnetic powder layers, the first one and the second one of the plurality of flexible magnetic powder sheets being adjacent one another and at least partly in direct surface engagement around the multiple turn coil.

53. An electromagnetic component comprising:

a laminated structure comprising;

a plurality of stacked flexible sheet layers joined to one another; and

a multiple turn coil surrounded by the joined flexible sheet layers, the multiple turn coil being separately provided from and fabricated independently from all of the plurality of stacked flexible sheet layers;

wherein at least some of the flexible sheet layers are flexibly pressed in surface engagement with and around an outer surface of the multiple turn coil to enclose the multiple turn coil without a physical gap; and

wherein all of the plurality of stacked flexible sheet layers comprise magnetic powder sheet layers;

wherein at least one of the plurality of stacked flexible sheet layers is pressed in surface engagement to and around an outer surface of the multiple turn coil; and

wherein each of the plurality of stacked flexible sheet layers is pressed in surface contact with at least one other of the plurality of stacked flexible sheet layers; and

at least a first terminal on a first one of the plurality of flexible sheet layers and at least a second terminal on a second one of the plurality of flexible sheet layers.

54. The electromagnetic component of claim 53, wherein the multiple turn coil includes an upper outer surface and a lower outer surface opposing the upper outer surface, wherein the upper outer surface is in surface contact with a first one of the plurality of stacked flexible sheet layers, wherein the lower outer surface is in surface contact with a second one of the plurality of stacked flexible sheet layers, and wherein at least a portion of the first and second one of the plurality of stacked flexible sheet layers are in direct surface engagement with one another.