Magnetostrictive-compensated core of electromagnetic device

• US 6,476,532 B1
• Filed: 12/29/1998
• Issued: 11/05/2002
• Est. Priority Date: 12/29/1998
• Status: Expired due to Fees

• Current Assignee: Northrop Grumman Shipbuilding Incorporated (Huntington Ingalls Industries Incorporated)
• Original Assignee: DRY Dock Company, Newport News Shipbuilding
• Inventors: Kennamer, Donald E.
• Primary Examiner(s): DONOVAN, LINCOLN D
• Application Number:
  US09/222,476
• Time in Patent Office: 1,407 Days
• Field of Search: 428/694.T, 428/694.TM, 310/216, 310/218, 335/296-299, 335/215
• US Class Current: 310/216.004
• CPC Class Codes: H02K 1/02 characterised by the magnetic material
• CPC Class Codes: H02K 1/16 Stator cores with slots for windings

Abstract

The present invention eliminates vibration of an electromagnetic device, apparatus or machine caused by magnetostrictive and Joule effects. Specifically, the present invention discloses making an electromagnetic device, apparatus or machine with magnetostrictive contracting and magnetostrictive expanding materials. Once exposed to a magnetic field, the amount of contraction and expansion of the materials should be virtually the same to minimize generation of vibratory energy that can be transmitted from a core to a housing.

Claims

1. A core, comprising:

a plurality of sheets made of a first material that are laminated together to form a main block of the core; and

a plurality of teeth made of a second material;

wherein the plurality of teeth is attached to the main block;

wherein (a) the first material is a magnetostrictive expanding material and the second material is a magnetostrictive contracting material, or (b) the first material is a magnetostrictive contracting material and the second material is a magnetostrictive expanding material;

wherein the core is constructed of the two materials that magnetostrictively counteract one another under the influence of a magnetic field such that the core undergoes about no net change in size due to the magnetostrictive effect.

2. The core of claim 1, wherein the main block comprises an interior perimeter.

3. The core of claim 1, wherein each tooth is substantially rectangular in shape having a set of opposing edges each with a groove.

4. The core of claim 3, further comprising a plurality of L-shaped couplers each having a tongue mated for the groove.

5. The core of claim 4, wherein the plurality of teeth is attached to the main block by transversely mounting each tooth to the interior perimeter of the main block by inserting each tongue into each groove.

6. The core of claim 5, wherein each coupler is fastened to the main block.

7. The core of claim 6, wherein the each of the plurality of teeth are separated equal distance apart from each other forming a plurality of slots therebetween.

8. The core of claim 1, wherein the first material comprises nickel and the second material comprise iron.

9. The core of claim 1, wherein the first material comprises iron and the second material comprises nickel.

10. The core of claim 1, wherein the core is an electromagnetic core for a device selected from the following, a motor, a stator, a rotor, a transformer, a solenoid, a relay, a generator and an alternator.

11. The core of claim 1, wherein a ratio of an amount of the first material to an amount of the second material is about five to one (5:

1) or about one to five (1;

5).

12. A core, comprising:

a plurality of magnetostrictive contracting sheets; and

a plurality of magnetostrictive expanding sheets;

wherein the magnetostrictive contracting sheets and the magnetostrictive expanding sheets are laminated together to form the core,

wherein the core is constructed of the two materials that magnetostrictively counteract one another under the influence of a magnetic field such that the core undergoes about no net change in size due to the magnetostrictive effect.

13. The core of claim 12, wherein the core comprises an interior portion having a plurality of teeth.

14. The core of claim 13, wherein the teeth are separated an equal distance apart from each other to form a plurality of slots therebetween.

15. The core of claim 12 wherein a ratio of a number of the magnetostrictive expanding sheets and a number of the magnetostrictive contracting sheets is five to one (5:

1).

16. The core of claim 12 wherein there is one magnetostrictive contracting sheet adjacent every five magnetostrictive expanding sheets.

17. The core of claim 12 wherein each magnetostrictive expanding sheet is about five time thicker than each magnetostrictive contracting sheet.

18. The core of claim 12, wherein the core is an electromagnetic core for one of a motor, a stator, a rotor, a transformer, a solenoid, a relay, a generator and an alternator.

19. The core of claim 12, wherein the magnetostrictive contracting sheets comprise nickel and the magnetostrictive expanding sheets comprise iron.

20. A core, comprising:

a plurality of magnetostrictive contracting sheets having a plurality of teeth protruding from an interior perimeter; and

a plurality of magnetostrictive expanding sheets having a plurality of teeth protruding from an interior perimeter;

wherein the magnetostrictive contracting sheets and the magnetostrictive expanding sheets are laminated together to form the core,

wherein the core is constructed of the two materials that magnetostrictively counteract one another under the influence of a magnetic field such that the core undergoes about no net change in size due to the magnetostrictive effect.

21. The core of claim 20, wherein a ratio of a number of the magnetostrictive expanding sheets and a number of the magnetostrictive contracting sheets is five to one (5:

1).

22. The core of claim 20, wherein there is one magnetostrictive contracting sheet adjacent every five magnetostrictive expanding sheets.

23. The core of claim 20, wherein each magnetostrictive expanding sheet is about five times thicker than each magnetostrictive contracting sheet.

24. The core of claim 20, wherein the magnetostrictive contracting sheets comprise nickel and the magnetostrictive expanding sheets comprise iron.

25. The core of claim 20, wherein the core is an electromagnetic core for one of a motor, a stator, a rotor, a transformer, a solenoid, a relay, a generator and an alternator.

26. A core, comprising:

a plurality of sheets made of a first material that are laminated together to form a main block of the core; and

a plurality of teeth made of a second material;

wherein the plurality of teeth is attached to the main block;

wherein (a) the first material is a magnetostrictive expanding material and the second material is a magnetostrictive contracting material, or (b) the first material is a magnetostrictive contracting material and the second material is a magnetostrictive expanding material;

wherein the core is constructed of the two materials that magnetostrictively counteract one another under the influence of a magnetic field such that the core undergoes a slight contraction due to the magnetostrictive effect.

27. The core of claim 26, wherein the main block comprises an interior perimeter.

33. The core of claim 26, wherein the first material comprises nickel and the second material comprise iron.

34. The core of claim 26, wherein the first material comprises iron and the second material comprises nickel.

35. The core of claim 26, wherein the core is an electromagnetic core for a device selected from the following:

a motor, a stator, a rotor, a transformer, a solenoid, a relay, a generator and an alternator.

36. The core of claim 26, wherein a ratio of an amount of the first material to an amount of the second material is about five to one (5:

1) or about one to five (1;

5).

28. The core of claim 28, wherein each tooth is substantially rectangular in shape having a set of opposing edges each with a groove.

29. The core of claim 28, further comprising a plurality of L-shaped couplers each having a tongue mated for the groove.

30. The core of claim 29, wherein the plurality of teeth is attached to the main block by transversely mounting each tooth to the interior perimeter of the main block by inserting each tongue into each groove.

31. The core of claim 30, wherein each coupler is fastened to the main block.

32. The core of claim 31, wherein each of the plurality of teeth are separated an equal distance apart from each other forming a plurality of slots therebetween.

37. A core, comprising:

a plurality of magnetostrictive contracting sheets; and

a plurality of magnetostrictive expanding sheets;

wherein the magnetostrictive contracting sheets and the magnetostrictive expanding sheets are laminated together to form the core,

counteract one another under the influence of a magnetic field such that the core undergoes a slight contraction due to the magnetostrictive effect.

38. The core of claim 37, wherein the core comprises an interior portion having a plurality of teeth.

39. The core of claims 38, wherein the teeth are separated an equal distance apart from each other to form a plurality of slots therebetween.

40. The core of claim 37, wherein a ratio of a number of the magnetostrictive expanding sheets and a number of the magnetostrictive contracting sheets is five to one (5:

1).

41. The core of claim 37, wherein there is one magnetostrictive contracting sheet adjacent every five magnetostrictive expanding sheets.

42. The core of claim 37, wherein each magnetostrictive expanding sheet is about five times thicker than each magnetostrictive contracting sheet.

43. The core of claim 37, wherein the core is an electromagnetic core for one of a motor, a stator, a rotor, a transformer, a solenoid, a relay, a generator and an alternator.

44. The core of claim 37, wherein the magnetostrictive contracting sheets comprise nickel and the magnetostrictive expanding sheets comprise iron.

45. A core, comprising:

a plurality of magnetostrictive contracting sheets having a plurality of teeth protruding from an interior perimeter; and

a plurality of magnetostrictive expanding sheets having a plurality of teeth protruding from an interior perimeter;

wherein the magnetostrictive contracting sheets and the magnetostrictive expanding sheets are laminated together to form the core,

wherein the core is constructed of the two materials that magnetostrictively counteract one another under the influence of a magnetic field such that the core undergoes a slight contraction due to the magnetostrictive effect.

46. The core of claim 45, wherein a ratio of a number of the magnetostrictive expanding sheets and a number of the magnetostrictive contracting sheets is five to one (5:

1).

47. The core of claim 45, wherein there is one magnetostrictive contracting sheet adjacent every five magnetostrictive expanding sheets.

48. The core of claim 45, wherein each magnetostrictive expanding sheet is about five times thicker than each magnetostrictive contracting sheet.

49. The core of claim 45, wherein the magnetostrictive contracting sheets comprise nickel and the magnetostrictive expanding sheets comprise iron.

50. The core of claim 45, wherein the core is an electromagnetic core for one of a motor, a stator, a rotor, a transformer, a solenoid, a relay, a generator and an alternator.