Magnetizing apparatus

• US 9,269,482 B2
• Filed: 08/16/2014
• Issued: 02/23/2016
• Est. Priority Date: 04/04/2008
• Status: Expired due to Fees

• Current Assignee: Correlated Magnetics Research, LLC
• Original Assignee: Correlated Magnetics Research, LLC
• Inventors: Fullerton, Larry W.
• Primary Examiner(s): Barrera, Ramon M
• Application Number:
  US14/461,368
• Publication Number:
  US 20140354383A1
• Time in Patent Office: 556 Days
• Field of Search: 335/284, 361143-156
• US Class Current: 1/1
• CPC Class Codes: H01F 13/003 Methods and devices for magnetising permanent magnets permanent magnets H01F7/02
• CPC Class Codes: H01F 7/02 Permanent magnets [PM]
• CPC Class Codes: H01F 7/0215 Flexible forms, sheets

Abstract

Magnetic structure production may relate, by way of example but not limitation, to methods, systems, etc. for producing magnetic structures by printing magnetic pixels (aka maxels) into a magnetizable material. Disclosed herein is production of magnetic structures having, for example: maxels of varying shapes, maxels with different positioning, individual maxels with different properties, maxel patterns having different magnetic field characteristics, combinations thereof, and so forth. In certain example implementations disclosed herein, a second maxel may be printed such that it partially overwrites a first maxel to produce a magnetic structure having overlapping maxels. In certain example implementations disclosed herein, a magnetic printer may include a print head comprising multiple parts and having various properties. In certain example implementations disclosed herein, various techniques for using a magnetic printer may be employed to produce different magnetic structures. Furthermore, description of additional magnet-related technology and example implementations thereof is included herein.

Claims

1. A magnetizing apparatus, comprising:

an inductor coil having a hole; and

a circuitry configured for applying a current to said inductor coil to create a magnetic pulse having a sub-millisecond duration and having a flux density sufficient to produce a maxel at a location on a first surface of a magnetizable material comprising Neodymium, said magnetizable material having a thickness between said first surface and a second surface opposite said first surface, said maxel having an area on said first surface about said location, said maxel having a depth within said magnetizable material that is less than or equal to said thickness, said maxel having a magnetic flux density of at least 1500 Gauss as measured at said location on said first surface of said magnetizable material, said maxel comprising a first pole having a first polarity and a second pole having a second polarity that is opposite said first polarity, said first pole of said maxel being substantially exposed within said area on said first surface, said second pole of said maxel being not substantially exposed on said first surface, said first surface having a portion outside said area that is one of unmagnetized or previously magnetized to have said second polarity.

2. The apparatus of claim 1, wherein said maxel has a magnetic flux density of at least 2500 Gauss as measured at said location on said surface of said magnetizable material.

3. The apparatus of claim 1, wherein said maxel has a magnetic flux density of at least 3000 Gauss as measured at said location on said surface of said magnetizable material.

4. The apparatus of claim 1, wherein said maxel has a magnetic flux density of at least 3500 Gauss as measured at said location on said surface of said magnetizable material.

5. The apparatus of claim 1, wherein said maxel has a magnetic flux density of at least 3900 Gauss as measured at said location on said surface of said magnetizable material.

6. The apparatus of claim 1, wherein said magnetic pulse has a duration of less than 25 microseconds.

7. The apparatus of claim 1, wherein said magnetic pulse has a duration of at least 25 microseconds and less than 50 microseconds.

8. The apparatus of claim 1, wherein said magnetic pulse has a duration of at least 50 microseconds and less than 100 microseconds.

9. The apparatus of claim 1, wherein said magnetic pulse has a duration of at least 100 microseconds and less than 250 microseconds.

10. The apparatus of claim 1, wherein said magnetic pulse has a duration of at least 250 microseconds and less than 500 microseconds.

11. The apparatus of claim 1, wherein the flux density comprises a first magnetic flux density and a second magnetic flux density, and wherein a first portion of said first surface of said magnetizable material that is inside said area is subjected to said first magnetic flux density and at least a second portion of said first surface of said magnetizable material that is outside said area is subjected to said second magnetic flux density, and wherein the first magnetic flux density is sufficient to create saturated magnetization in said magnetizable material and said second magnetic flux density is insufficient to create saturated magnetization in said magnetizable material.

12. The apparatus of claim 1, wherein said inductor coil comprises a flat conductor having a plurality of layers forming said inductor coil and said hole, said hole extending through the plurality of layers.

13. The apparatus of claim 12, wherein said flat conductor is a flat metal conductor.

14. The apparatus of claim 13, wherein said flat metal conductor comprises a plurality of attached conductors.

15. The apparatus of claim 1, wherein said inductor coil comprises copper.

16. The apparatus of claim 1, wherein said inductor coil comprises at least one of silver, gold, brass, or aluminum.

17. The apparatus of claim 1, wherein said inductor coil comprises a stack of at least three turns.

18. The apparatus of claim 1, further comprising:

a second circuitry that positions said hole of said inductor coil adjacent to said location on said surface of said magnetizable material where the maxel is to be produced.

19. The apparatus of claim 1, wherein said maxel has a radius greater than 0.08 inches.

20. The apparatus of claim 1, wherein said maxel has a radius less than 0.12 inches.

21. The apparatus of claim 1, wherein said maxel has a round shape on the surface of the magnetizable material.

22. The apparatus of claim 1, wherein said maxel has a curved shape on the surface of the magnetizable material.

23. The apparatus of claim 1, wherein said maxel has a rectangular shape on the surface of the magnetizable material.

24. The apparatus of claim 1, wherein said maxel has a parabolic shape inside the magnetizable material.

25. The apparatus of claim 1, wherein said maxel has a Gaussian shape inside the magnetizable material.

26. The apparatus of claim 1, wherein said maxel extends from said first surface of the magnetizable material to a said second surface of the magnetizable material.

27. The apparatus of claim 1, wherein said maxel extends to a depth within the magnetizable material that is less than the thickness of the magnetizable material.

28. The apparatus of claim 1, wherein said hole has a diameter that is less than or equal to 0.7 mm.

29. The apparatus of claim 1, wherein said hole has a diameter that is greater than 0.7 mm and less than or equal to 1.0 mm.

30. The apparatus of claim 1, wherein said hole has a diameter that is greater than 1.0 mm and less than or equal to 2.0 mm.

31. The apparatus of claim 1, wherein said hole has a diameter that is greater than 2.0 mm and less than or equal to 3.0 mm.

32. The apparatus of claim 1, wherein said hole has a diameter that is greater than 3.0 mm and less than or equal to 4.0 mm.

33. The apparatus of claim 1, wherein said hole has a diameter that is greater than 4.0 mm.

34. The apparatus of claim 1, wherein the maxel has a width that is less than or equal to 1.0 mm on the surface of the magnetizable material.

35. The apparatus of claim 1, wherein the maxel has a width that is greater than 1.0 mm and is less than or equal to 2.0 mm on the surface of the magnetizable material.

36. The apparatus of claim 1, wherein the maxel has a width that is greater than 2.0 mm and is less than or equal to 3.0 mm on the surface of the magnetizable material.

37. The apparatus of claim 1, wherein the maxel has a width that is greater than 3.0 mm and is less than or equal to 4.0 mm on the surface of the magnetizable material.

38. The apparatus of claim 1, wherein the maxel has a width that is greater than 4.0 mm and is less than or equal to 5.0 mm on the surface of the magnetizable material.

39. The apparatus of claim 1, wherein the maxel has a width that is greater than or equal to 5.0 mm and is less than or equal to 6.0 mm on the surface of the magnetizable material.

40. The apparatus of claim 1, wherein the maxel has a width that is greater than 6.0 mm on the surface of the magnetizable material.

41. The apparatus of claim 1, wherein said magnetic pulse has a bandwidth greater than 1000 KHz.

42. The apparatus of claim 1, wherein said magnetic pulse has a bandwidth less than 1500 KHz.

43. The apparatus of claim 1, wherein said current is greater than or equal to 1000 amperes.

44. The apparatus of claim 1, wherein said current is greater than or equal to 5000 amperes.

45. The apparatus of claim 1, wherein said current is greater than or equal to 10000 amperes.

46. The apparatus of claim 1, wherein said current is greater than or equal to 25000 amperes.

47. The apparatus of claim 1, wherein said current is greater than or equal to 50000 amperes.

48. The apparatus of claim 1, wherein said current is greater than or equal to 75000 amperes.

49. The apparatus of claim 1, wherein said current is less than or equal to 100000 amperes.

50. A magnetizing method implemented by a magnetizing apparatus comprising an inductor coil and circuitry, the method comprising:

positioning the inductor coil having a hole at a location on a first surface of a magnetizable material comprising Neodymium, said magnetizable material having a thickness between said first surface and a second surface opposite said first surface; and

controlling the circuitry to apply a current to said inductor coil to create a magnetic pulse having a sub-millisecond duration and having a flux density sufficient to produce a maxel at said location, said maxel having an area on said first surface about said location, said maxel having a depth within said magnetizable material that is less than or equal to said thickness, said maxel having a magnetic flux density of at least 1500 Gauss as measured at said location on said first surface of said magnetizable material, said maxel comprising a first pole having a first polarity and a second pole having a second polarity that is opposite said first polarity, said first pole of said maxel being substantially exposed within said area on said first surface, said second pole of said maxel being not substantially exposed on said first surface, said first surface having a portion outside said area that is one of unmagnetized or previously magnetized to have said second polarity.