Power generating device

Patent metadata

Field	Value
Publication number	US-9806592-B2
Application number	US-201414309109-A
Country	US
Kind code	B2
Filing date	Jun 19, 2014
Priority date	Jan 12, 2012
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

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.

First claim

What is claimed is:

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 μm or less.

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

Assignees

• Fujitsu Ltd

Inventors

• Toyoda Osamu

Classifications

• H02K33/00 Primary

  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 title

• H02N2/186 Primary

  Vibration harvesters · CPC title

• H01L41/125

  Electricity · mapped topic

• H10N35/101

  with mechanical input and electrical output, e.g. generators, sensors · CPC title