Power generating device

• US 9,806,592 B2
• Filed: 06/19/2014
• Issued: 10/31/2017
• Est. Priority Date: 01/12/2012
• Status: Expired due to Fees

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Toyoda, Osamu
• Primary Examiner(s): Nguyen, Hanh
• Application Number:
  US14/309,109
• Publication Number:
  US 20140300216A1
• Time in Patent Office: 1,230 Days
• Field of Search: 310303, 310306, 310309, 310308
• CPC Class Codes: H02K 33/00 Motors with reciprocating, oscillating or vibrating magnet, armature or coil system arrangements for handling mechanical energy structurally associated with motors H02K7/00, e.g. H02K7/06
• CPC Class Codes: H02N 2/186 Vibration harvesters
• CPC Class Codes: H10N 35/101 with mechanical input and electrical output, e.g. generators, sensors

Abstract

There are included: an oscillating member that includes a tough layer and a magnetostrictive layer stacked above the tough layer and formed of a magnetostrictive material, the tough layer formed of a tough material having a tensile strength higher than that of the magnetostrictive material; a supporting member to which the oscillating member is attached to be able to oscillate in the thickness direction; a magnetic field applying member that applies a magnetic field to the magnetostrictive layer; and a coil that is disposed around the magnetostrictive layer.

Claims

1. A power generating device, comprising:

an oscillating member, the oscillating member comprising;

a tough layer, and

a magnetostrictive layer that is stacked above the tough layer and is formed of a magnetostrictive material, the tough layer formed of a tough material having a tensile strength higher than that of the magnetostrictive material;

a supporting member to which the oscillating member is attached to be able to oscillate in the thickness direction;

a magnetic field applying member that applies a magnetic field to the magnetostrictive layer; and

a coil that is disposed around the magnetostrictive layer,

wherein a recessed portion is formed in a surface of the supporting member and the oscillating member projects above the recessed portion at the tip side of the oscillating member.

2. The power generating device according to claim 1, wherein the tough layer is formed thicker than the magnetostrictive layer.

3. The power generating device according to claim 1, wherein the magnetostrictive layer has a thickness of 1000 μ

m or less.

4. The power generating device according to claim 1, wherein the tough layer has a thickness of 1000 μ

m or less.

5. The power generating device according to claim 1, wherein the tough material has a tensile strength of 1000 MPa or more.

6. The power generating device according to claim 1, wherein the tough material has a Young'"'"'s modulus of 150 GPa or less.

7. The power generating device according to claim 1, wherein the tough material has elastic limit elongation of 0.5% or more.

8. The power generating device according to claim 1, wherein the tough material is metallic glass or GUMMETAL (registered trademark).

9. The power generating device according to claim 1, wherein the tough material is a superelastic alloy.

10. The power generating device according to claim 1, wherein the tough material is silicon.

11. The power generating device according to claim 1, wherein the tough material is ceramics.

12. The power generating device according to claim 1, wherein the tough material is a polymeric material.

13. The power generating device according to claim 1, wherein the coil is formed integrally with the oscillating member.

14. The power generating device according to claim 13, wherein the coil is wound around the magnetostrictive layer and has a lower portion thereof disposed between the tough layer and the magnetostrictive layer.

15. The power generating device according to claim 13, wherein the coil includes a plane ladder coil disposed at least above or below the magnetostrictive layer.

16. The power generating device according to claim 15, wherein the plane ladder coil is disposed below the magnetostrictive layer and is disposed between the tough layer and the magnetostrictive layer.

17. The power generating device according to claim 1, wherein

the oscillating member further comprises insulating layers surrounding the magnetostrictive layer, and

the coil is buried in the insulating layers.

18. The power generating device according to claim 1, wherein the magnetic field applying member doubles as a package member covering the oscillating member.

19. The power generating device according to claim 18, wherein the container has an inside thereof brought into a vacuum or reduced pressure state.

20. The power generating device according to claim 1, further comprising:

a container that houses the oscillating member therein, wherein the coil is wound around the container.

21. The power generating device according to claim 1, wherein a weight is attached to the oscillating member.

22. The power generating device according to claim 21, wherein the weight is a magnet.

23. The power generating device according to claim 21, wherein the weight is formed at a tip side of the oscillating member.