Piezo magnetostrictive device

• US 20110001397A1
• Filed: 07/01/2010
• Published: 01/06/2011
• Est. Priority Date: 07/02/2009
• Status: Active Grant

• Current Assignee: Goodyear Tire & Rubber Company
• Original Assignee: Cooper Tire & Rubber Company (Goodyear Tire & Rubber Company)
• Inventors: Tucker, Randall L.
• Granted Patent: US 8,330,335 B2
• Time in Patent Office: Days
• US Class Current: 310/339
• CPC Class Codes: H10N 30/00 Piezoelectric or electrostrictive devices integrated devices or assemblies of multiple devices H10N39/00
• CPC Class Codes: H10N 30/85 Piezoelectric or electrostrictive active materials

Abstract

A piezo magnetostrictive device has a sheet of piezo material with an array of holes formed therein. At least some of the holes are filled with a magnetostrictive material which converts magnetic energy to mechanical energy by exhibiting a change in length or breadth upon being subjected to a change in magnetic energy. The sheet of piezo material generates an electrical potential in response to applied mechanical strain caused by such change in length or width of the magnetostrictive material in the holes.

Claims

1. A power generating device comprising:

(a) a sheet of piezo material having the capability of generating an electric field when subjected to mechanical strain, said sheet having a thickness in the range of 0.005 to 200 mm and having (i) a first surface and a second surface spaced therefrom and substantially parallel thereto and (ii) a plurality of recesses or holes extending from the first surface toward the second surface, said recesses or holes being positioned (A) in a plurality of rows, each extending in a straight line path in a first direction and being parallel to each adjacent row extending in said first direction, said first direction rows being spaced from each adjacent row to define a plurality of parallel aligned spaces, and (B) a plurality of rows, each extending in a second direction substantially perpendicular to said first direction; and

(b) magnetostrictive material positioned in at least some of said recesses or holes.

2. A power generating device according to claim 1 wherein each of said rows extending in said second direction is spaced apart from each adjacent row extending in said second direction.

3. A power generating device according to claim 1 wherein alternate ones of said rows extending in said second direction are spaced apart from other alternate ones of said rows extending in said second direction but are not spaced apart from adjacent ones of said rows extending in said second direction.

4. A power generating device according to claim 3 wherein the recesses or holes defining adjacent extending in said second direction are positioned in alternate ones of said rows extending in said first direction.

5. A power generating device comprising:

(a) a sheet of piezo material having the capability of generating an electric field when subjected to mechanical strain, said sheet having a thickness in the range of 0.005 to 1.0 mm and having (i) a first surface and a second surface spaced therefrom and substantially parallel thereto and (ii) a plurality of recesses or holes extending from the first surface toward the second surface, (iii) first and second longitudinal edges and (iv) first and second end edges, both sets of said edges extending from said first surface to said second surface, said recesses or holes being positioned (A) in a plurality of longitudinal rows, each extending in a straight line path substantially parallel to said longitudinal edges, said longitudinal rows being spaced from each adjacent longitudinal row to define a plurality of parallel aligned spaces, said parallel aligned spaces being parallel to said longitudinal edges and (B) a plurality of widthwise rows, each extending in a straight line path parallel to each other; and

(b) magnetostrictive material positioned in at least some of said recesses or holes.

6. A power generating device according to claim 5 wherein each of said widthwise rows is spaced apart from each adjacent widthwise row.

7. A power generating device according to claim 5 wherein alternate ones of said widthwise rows are spaced apart from other alternate ones of said widthwise rows but are not spaced apart from adjacent ones of said widthwise rows.

8. A power generating device according to claim 7 wherein the recesses or holes defining adjacent widthwise rows are positioned in alternate ones of said longitudinal rows.

9. A power generating device comprising:

(a) a sheet of piezo material having the capability of generating an electric field when subjected to mechanical strain, said sheet having (i) a first surface and a second surface spaced therefrom and substantially parallel thereto and (ii) a plurality of recesses or holes extending from the first surface toward the second surface, said recesses or holes being positioned (A) in a plurality of rows, each extending in a straight line path in a first direction and being parallel to each adjacent row extending in said first direction, and (B) a plurality of rows, each extending in a second direction substantially perpendicular to said first direction; and

(b) magnetostrictive material positioned in at least some of said recesses or holes.

10. A power generating device according to claim 9 wherein said first direction rows are spaced from each adjacent row to define a plurality of parallel aligned spaces.

11. A power generating device according to claim 10 wherein each of said rows extending in said second direction is spaced apart from each adjacent row extending in said second direction to define a plurality of parallel spaces extending in said second direction.

12. A power generating device according to claim 9 wherein alternate ones of said rows extending in said first direction are spaced apart from other alternate ones of said rows extending in said first direction but are not spaced apart from adjacent ones of said rows extending in said first direction.

13. A power generating device according to claim 12 wherein alternate ones of said rows extending in said second direction are spaced apart from other alternate ones of said rows extending in said second direction but are not spaced apart from adjacent ones of said rows extending in said second direction.

14. A method for generating electric power comprising the steps of:

(a) providing a sheet of piezo material having the capability of generating an electric field when subjected to mechanical strain, said sheet having a first surface and a second surface spaced therefrom and substantially parallel thereto,

(b) forming a plurality of recesses or holes in said sheet extending from the first surface toward the second surface, said recesses or holes being positioned (i) in a plurality of rows, each extending in a straight line path in a first direction and being parallel to each adjacent row extending in said first direction, and (ii) a plurality of rows, each extending in a second direction substantially perpendicular to said first direction, and

(c) positioning magnetostrictive material in at least some of said recesses or holes;

(d) subjecting said piezo sheet and said magnetostrictive material to a magnetic field different from the magnetic field, if any, at the time of positioning as set forth in step (c).

15. The method according to claim 14 further including the step of positioning said recesses or holes such that each of said rows extending in said first direction is spaced from each adjacent row to define a plurality of parallel aligned spaced.

16. The method according to claim 15 further including the steps of positioning said recesses or holes such that each of said rows extending in said second direction is spaced apart from each adjacent row extending in said second direction.

17. The method according to claim 15 further including the step of positioning said recesses or holes such that alternate ones of said rows extending in said second direction are spaced apart from other alternate ones of said rows extending in said second direction but are not spaced apart from adjacent ones of said rows extending in said second direction.

18. The method according to claim 14 further including the step of positioning said recesses or holes such that alternate ones of said rows extending in said first direction are spaced apart from other alternate ones of said rows extending in said first direction but are not spaced apart from adjacent ones of said rows extending in said first direction, and alternate ones of said rows extending in said second direction are spaced apart from other alternate ones of said rows extending in said second direction but are not spaced apart from adjacent ones of said rows extending in said second direction.