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Power generation element and power generation apparatus provided with power generation element achieved

Foreign code F130007637
File No. 2009-0036IN
Posted date Oct 2, 2013
Country India
Application number CHE105632012
Gazette No. 10563/CHENP/2012
Gazette No. 325831
Date of filing Dec 19, 2012
Gazette Date May 23, 2014
Gazette Date Nov 26, 2019
International application number JP2011003276
International publication number WO2011158473
Date of international filing Jun 9, 2011
Date of international publication Dec 22, 2011
Priority data
  • P2010-139930 (Jun 18, 2010) JP
Title Power generation element and power generation apparatus provided with power generation element achieved
Abstract The present invention provides a power generation element which has strong resistance to bending and impact and has high power generation capacity, and a power generation apparatus including the power generation element.
The power generation element (1) includes: a first magnetostrictive rod (11a) made of a magnetostrictive material; a rigid rod (lib) made of a magnetic material and disposed in parallel with the first magnetostrictive rod (11a), the magnetic material having rigidity and a shape that enable uniform application of compression force or tensile force to the first magnetostrictive rod (11a); a first coil (12c) wound around the first magnetostrictive rod (11a); and two connecting yokes (10a and 10b) each of which is provided at one end of each of the first magnetostrictive rod (11a) and the rigid rod (11b) to connect the first magnetostrictive rod (11a) and the rigid rod (11b), wherein the power generation element (1) generates power through expansion or contraction of the first magnetostrictive rod (11a) due to vibration in a direction perpendicular to an axis direction of the first magnetostrictive rod (11a).
Outline of related art and contending technology Background Art]
Conventionally, techniques for generating power from ambient vibration have been actively developed. Among them, a technique for generating power from piezoelectric elements and a technique for generating power from a change in magnetic flux density of a permanent magnet are known.
Many of the methods for generating power using a piezoelectric element are performed by generating power by deforming the piezoelectric elements by external force in some way or other. Methods for deforming piezoelectric elements include a method for deforming a piezoelectric element by application of vibration to piezoelectric elements, a method for indirectly applying pressure such as wind pressure or sound pressure, a method for causing an object such as a weight to collide with piezoelectric elements, and a method for attaching piezoelectric elements to a deformed object (for example, refer to Patent Literature 1). Patent Literature 1 discloses a sound power generation apparatus which generates power by a piezoelectric element using air pressure fluctuation caused by sound and a vibration power generation apparatus which generates power by piezoelectric elements using pressure fluctuation caused by vibration.
Moreover, a method for generating power using a change in magnetic flux of a permanent magnet is a method for generating power by a temporal change in interlinkage magnetic flux density of coil caused by vibration of the permanent magnet, that is, a method for generating power using electromagnetic induction (for example, refer to Non Patent Literature 1 and Patent Literature 2).
Non Patent Literature 1 discloses a power generation element which generates power through a change in magnetic flux density within the coil and generation of current by a permanent magnet vibrating within the coil in parallel with a magnetization direction.
Patent Literature 2 discloses a piezoelectric element including: a bias magnet which is magnetized in two poles; a magnetostrictive material which changes magnetic permeability through a reverse magnetostrictive effect by applying force from outside and changes a flow of magnetic flux; a compressing means which periodically compresses the magnetostrictive material in a direction having magnetic anisotropy; and a coil means which induces current by the periodically changing magnetic flux. In the power generation element, the magnetostrictive material, the coil, and the compressing means are disposed such that the periodically changing magnetic flux and the coil wound around the coil center form a linkage. In other words, this is a configuration which generates power with current which is generated in the coil by periodically compressing, in a longitudinal direction, the magnetostrictive material having magnetic anisotropy in a longitudinal direction.
Scope of claims [claim1]
1. A power generation element, comprising: - a first magnetostrictive rod (11a) made of a magnetostrictive material; - a rigid rod (11b) made of a magnetic material and disposed in parallel with the first magnetostrictive rod, the magnetic material having rigidity and a shape that enable uniform application of compression force or tensile force to the first magnetostrictive rod; - a first coil (12a) wound around the first magnetostrictive rod (11a); and - two connecting yokes (10a, 10b) each of which is provided at one end of each of the first magnetostrictive rod and the rigid rod to connect the first magnetostrictive rod (11a) and the rigid rod (11b), - characterized in that the power generation element generates power through expansion or contraction of the first magnetostrictive rod (11a) due to vibration in a direction perpendicular to an axis direction of the first magnetostrictive rod (11a).

[claim2]
2. The power generation element as claimed in Claim 1, - wherein the rigid rod (11b) is a second magnetostrictive rod made of a magnetostrictive material, - the power generation element further includes a second coil wound around the second magnetostrictive rod, and - the power generation element generates power through expansion of one of the first magnetostrictive rod (11a) and the second magnetostrictive rod and contraction of the other due to vibration in a direction perpendicular to an axis direction of the first magnetostrictive rod (11a) and the second magnetostrictive rod.

[claim3]
3. The power generation element as claimed in Claim 1, wherein an easy magnetization direction of the first magnetostrictive rod (11a) is in parallel with the axis direction of the first magnetostrictive rod.

[claim4]
4. The power generation element as claimed in Claim 2, wherein an easy magnetization direction of the first magnetostrictive rod (11a) and the second magnetostrictive rod is in parallel with an axis direction of the first magnetostrictive rod and the second magnetostrictive rod.

[claim5]
5. The power generation element as claimed in any one of Claims 1 to 4, further comprising a magnet having a back yoke.

[claim6]
6. The power generation element as claimed in any one of Claims 1 to 5, wherein one of the two connecting yokes (10a, 10b) is fixed and the other has a weight.

[claim7]
7. The power generation element as claimed in any one of Claims 1 to 6, wherein the power generation element resonates in a second resonant mode.

[claim8]
8. The power generation element as claimed in any one of Claims 1 to 7,wherein the weight has a shape that is longer in the axis direction of the magnetostrictive rod than in the direction perpendicular to the axis direction of the magnetostrictive rod.

[claim9]
9. The power generation element as claimed in Claim 1, wherein when the number of turns of the first coil is N, the first coil includes K coils connected in parallel and each having N/K turns.

[claim10]
10. The power generation element as claimed in Claim 2, wherein when the number of turns of each of the first coil and the second coil is N, the first coil and the second coil each include K coils connected in parallel and each having N/K turns.

[claim11]
11. The power generation element as claimed in one of Claims 1 and 2, further comprising - a plurality of power generation elements including the power generation element that are disposed in parallel, - wherein the power generation elements are connected in series.

[claim12]
12. The power generation element as claimed in any one of Claims 1 to 11,wherein the magnetostrictive material has ductility.

[claim13]
13. The power generation element as claimed in claim 1 in which the rigid rod (11b) and the two connecting yokes (10a, 10b) are formed into a single entity.

[claim14]
14. A power generation apparatus, comprising the power generation element as claimed in any one of Claims 1 to 13.
  • Applicant
  • KANAZAWA UNIVERSITY
  • Inventor
  • UENO Toshiyuki
  • IKEHATA Yoshio
  • YAMADA Sotoshi
IPC(International Patent Classification)
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