WO2017104530A1 - Dispositif de génération d'énergie piézo-électrique - Google Patents

Dispositif de génération d'énergie piézo-électrique Download PDF

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Publication number
WO2017104530A1
WO2017104530A1 PCT/JP2016/086527 JP2016086527W WO2017104530A1 WO 2017104530 A1 WO2017104530 A1 WO 2017104530A1 JP 2016086527 W JP2016086527 W JP 2016086527W WO 2017104530 A1 WO2017104530 A1 WO 2017104530A1
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WO
WIPO (PCT)
Prior art keywords
piezoelectric power
power generation
piezoelectric
load
fulcrum
Prior art date
Application number
PCT/JP2016/086527
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English (en)
Japanese (ja)
Inventor
講平 高橋
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株式会社村田製作所
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Priority to JP2017556007A priority Critical patent/JP6489237B2/ja
Publication of WO2017104530A1 publication Critical patent/WO2017104530A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
    • H02N2/18—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N30/00—Piezoelectric or electrostrictive devices
    • H10N30/01—Manufacture or treatment
    • H10N30/07—Forming of piezoelectric or electrostrictive parts or bodies on an electrical element or another base
    • H10N30/072—Forming of piezoelectric or electrostrictive parts or bodies on an electrical element or another base by laminating or bonding of piezoelectric or electrostrictive bodies
    • H10N30/073—Forming of piezoelectric or electrostrictive parts or bodies on an electrical element or another base by laminating or bonding of piezoelectric or electrostrictive bodies by fusion of metals or by adhesives
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N30/00—Piezoelectric or electrostrictive devices
    • H10N30/30—Piezoelectric or electrostrictive devices with mechanical input and electrical output, e.g. functioning as generators or sensors
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N30/00—Piezoelectric or electrostrictive devices
    • H10N30/80—Constructional details
    • H10N30/88—Mounts; Supports; Enclosures; Casings

Definitions

  • the present invention relates to a piezoelectric power generation apparatus having a piezoelectric power generation element in which a piezoelectric element is provided on one side of a metal plate.
  • Patent Document 1 discloses a piezoelectric power generation apparatus using a piezoelectric power generation element.
  • piezoelectric power generation elements are supported at both ends.
  • An elastic body is disposed below the piezoelectric power generation element.
  • the piezoelectric power generation element In the initial state, the piezoelectric power generation element is bent so as to protrude upward.
  • the elastic body is compressed. Accordingly, the piezoelectric power generation element is bent and protrudes downward.
  • the piezoelectric power generation element returns to the initial bent state by the restoring force of the elastic body. Electric power can be taken out by deformation between the two bent states of the piezoelectric power generation element.
  • Patent Document 2 discloses a power generation device in which a plurality of piezoelectric power generation elements are stacked.
  • a plurality of piezoelectric power generation elements are stacked via a support member that also serves as a conductive member.
  • a support member also serving as a conductive member is in contact with the center of the piezoelectric power generation element.
  • a deformation suppressing portion is formed on the support member that also serves as the conductive member. Thereby, a short circuit of the conductive member is suppressed.
  • An object of the present invention is to provide a piezoelectric power generation apparatus that has high power generation efficiency, can know the time point when pressing is completed, and is less likely to break the piezoelectric body.
  • a piezoelectric power generation apparatus includes a piezoelectric power generation element having a metal plate, a plate-like piezoelectric element provided on one surface of the metal plate, and a plurality of support members supporting the piezoelectric power generation element. At least one of the plurality of support members has a reversing spring, and the reversing spring has a self-restoring force of the shape, and is reversed by a pressing load necessary for power generation of the piezoelectric power generation element. Is provided.
  • the metal plate side of the piezoelectric power generation element is a side to which the pressing load is applied. Therefore, the power generation efficiency can be further increased.
  • the reversing spring has a peak load and a reversal smaller than the peak load in a load-stroke characteristic when a pressing load is applied to the piezoelectric power generating element. Complete load. Therefore, it is possible to more easily know the pressing completion point necessary for power generation by the change in the load from the peak load to the reverse completion load.
  • the at least one support member is the reversal spring.
  • the point of completion of pressing required for power generation can be known more reliably from the load-stroke characteristic of the reversing spring.
  • the reversing spring is present directly below at least one fulcrum among the fulcrums supporting the piezoelectric power generating element.
  • a pressing load is effectively applied to the reversing spring, and the pressing completion point can be known more reliably.
  • the at least one support member includes the reversing spring and a lever member having a force point, a fulcrum, and an action point
  • the piezoelectric power generation element includes the The piezoelectric power generating element is connected to the lever member so as to apply an external force to the force point of the lever member, and the fulcrum of the lever member is a fulcrum supporting the piezoelectric power generating element, and the lever member The point of action is in contact with or connected to the reversing spring.
  • an appropriate load can be applied to the reversing spring by adjusting the lever ratio of the lever member.
  • a case member is further provided, and the lever member and the reversing spring are disposed in the case member, and the lever member is disposed on the case member. Connected at the fulcrum.
  • the force point is located between the fulcrum and the action point. In this case, a smaller load can be applied to the reversing spring.
  • the action point is located between the power point and the fulcrum. In this case, a larger load can be applied to the reversing spring by the lever member.
  • a ratio between a distance between the fulcrum and the force point and a distance between the fulcrum and the action point is 2: 1 to 1: It is in the range of 3.
  • an appropriate load can be applied to the reversing spring.
  • the reversing spring is made of a metal member having a dome shape.
  • the piezoelectric power generation element has a structure in which a plurality of stacked bodies of the metal plate and the piezoelectric element are stacked. In this case, larger electric power can be taken out.
  • the plurality of support members are arranged on a peripheral edge portion of the metal plate.
  • the metal plate can be stably supported.
  • At least one of the surfaces of the metal plate that is opposite to the surface on which the piezoelectric element is provided protrudes to the opposite side of the piezoelectric element.
  • the piezoelectric power generation element can be supported using the legs. Therefore, a space in which the piezoelectric power generating element bends can be easily provided on the leg portion side of the piezoelectric power generating element.
  • the piezoelectric power generation device further includes a pressing member having a flat plate portion and a pressing protrusion protruding from the flat plate portion toward the piezoelectric power generating element.
  • the pressing protrusion is provided so as to be in contact with the piezoelectric power generation element.
  • the piezoelectric power generation apparatus not only can the power generation efficiency be improved, but also the completion of pressing of the piezoelectric power generation element necessary for power generation can be known. Accordingly, since an excessive pressing load is not easily applied to the piezoelectric power generation element, the piezoelectric body in the piezoelectric power generation element is hardly damaged.
  • FIG. 1A is a schematic front cross-sectional view of the piezoelectric power generation apparatus according to the first embodiment of the present invention
  • FIG. 1B is a diagram of the piezoelectric power generation element used in the first embodiment. It is the perspective view seen from the lower part
  • FIG.1 (c) is a perspective view which shows an inversion spring
  • FIG. 2A and FIG. 2B are schematic cross-sectional front views showing a state immediately after the start of the pressing operation and a state in which the pressing operation is completed in the piezoelectric power generation device according to the first embodiment of the present invention. .
  • FIG. 1A is a schematic front cross-sectional view of the piezoelectric power generation apparatus according to the first embodiment of the present invention
  • FIG. 1B is a diagram of the piezoelectric power generation element used in the first embodiment. It is the perspective view seen from the lower part
  • FIG.1 (c) is a perspective view which shows an inversion spring
  • FIG. 2A and FIG. 2B are schematic cross-sectional
  • FIG. 3 shows the stroke S, which is the distance traveled by the pressing load P applied to the piezoelectric power generation element by the pressing operation and the pressing point A to which the pressing load P is applied, in the piezoelectric power generating apparatus according to the first embodiment of the present invention. It is a figure which shows the relationship.
  • FIG. 4 shows a stroke S which is a distance traveled by the pressing load P applied to the piezoelectric power generating element by the pressing operation and the pressing point A to which the pressing load P is applied in the piezoelectric power generating apparatus according to the first embodiment of the present invention. It is a figure which shows the relationship, and is a figure for demonstrating contrast of the reversing spring with a large operating force, and the reversing spring with a small operating force.
  • FIG. 4 shows a stroke S which is a distance traveled by the pressing load P applied to the piezoelectric power generating element by the pressing operation and the pressing point A to which the pressing load P is applied in the piezoelectric power generating apparatus according to the
  • FIG. 5 is a schematic front cross-sectional view of a piezoelectric power generator according to a second embodiment of the present invention.
  • FIG. 6 is a schematic front cross-sectional view of a piezoelectric power generator according to a third embodiment of the present invention.
  • FIG. 7 is a schematic front sectional view showing the relationship between the reversing spring, the lever member, and the piezoelectric power generation element when the lever ratio of the lever member is 2: 1 in the fourth embodiment of the present invention.
  • FIG. 8 is a schematic front cross-sectional view showing the relationship between the reversing spring, the lever member, and the piezoelectric power generation element when the lever ratio of the lever member is 1: 3 in a modification of the fourth embodiment of the present invention.
  • FIG. 10 is an exploded perspective view of the piezoelectric power generation apparatus according to the fourth embodiment of the present invention.
  • FIG. 11 is a cross-sectional view showing a main part of a piezoelectric power generation apparatus according to the fourth embodiment of the present invention.
  • FIG. 1A is a schematic front cross-sectional view of a piezoelectric power generator according to a first embodiment of the present invention.
  • the piezoelectric power generation apparatus 1 includes a piezoelectric power generation element 3, a base portion 7 a, and a reversal spring 8.
  • the piezoelectric power generation element 3 includes a metal plate 2 and a piezoelectric element 10.
  • the metal plate 2 is made of an appropriate metal such as stainless steel.
  • the metal plate 2 includes a flat plate portion having first and second main surfaces 2a and 2b facing each other, and a plurality of leg portions.
  • the piezoelectric element 10 includes a piezoelectric layer 4, an electrode 5 provided on one surface of the piezoelectric layer 4, and an electrode 6 provided on the opposite surface.
  • the piezoelectric element 10 has a plate shape and is provided on one side of the metal plate 2. Specifically, the piezoelectric element 10 is bonded to the first main surface 2 a of the metal plate 2. This bonding can be performed by an appropriate method such as using an adhesive.
  • the electrode 6 may be omitted, and in this case, the metal plate 2 also serves as the other electrode.
  • the piezoelectric layer 4 is made of piezoelectric ceramics such as PZT and is polarized in the thickness direction.
  • the polarization axis direction of the piezoelectric layer 4 is, for example, a direction from the metal plate 2 toward the piezoelectric layer 4.
  • the material of the piezoelectric layer 4 is not particularly limited as long as electric power can be taken out by deformation associated with a pressing load described later.
  • FIG. 1B a plurality of leg portions 2c to 2f are provided on the peripheral edge portion of the second main surface 2b of the metal plate 2.
  • the plurality of leg portions 2c to 2f are provided at each corner portion of the rectangular metal plate 2.
  • the leg portions 2c to 2f may be provided at other positions on the peripheral edge of the metal plate 2.
  • FIG. 1A shows a cross section of the piezoelectric power generation apparatus 1 in a portion where the leg portions 2c and 2e are provided.
  • the lower end of the leg 2c is in contact with or fixed to the base 7a.
  • the base portion 7a supports the leg portion 2c.
  • a base portion is provided below the leg portion 2d in FIG.
  • the lower end of the leg 2e is in contact with the upper surface of the reversing spring 8. As shown in FIG. Although not particularly illustrated, the lower end of the leg 2f in FIG. 1B is also in contact with the upper surface of the reversing spring.
  • the reversing spring 8 has a dome shape and is made of a metal material.
  • the reversing spring 8 is deformed so that the apex moves downward when a load is applied downward from the apex side, and the shape is inverted when the applied load exceeds a certain value.
  • the reversed reversing spring 8 has a self-restoring force of a shape that restores to an initial shape (a shape when no load is applied) when the load is removed.
  • the plurality of leg portions 2c to 2f, the base portion 7a, and the reversing spring 8 are portions that support the flat plate portion of the metal plate 2 and the piezoelectric generating element 3.
  • the piezoelectric power generating element 3 only needs to have a structure in which the metal plate 2 and the piezoelectric element 10 are laminated, and the plurality of leg portions described above. 2c to 2f may be configured separately from the metal plate 2 as a part of the support member. Therefore, the leg portions 2c to 2f in the present embodiment are also portions that constitute a support member, although they are provided integrally with the metal plate 2.
  • the flat plate portion of the metal plate 2 is supported at the upper end portions of the leg portions 2c to 2f.
  • the one leg part 2c comprises the one supporting member in this invention with the said base part 7a.
  • the leg 2e and the reversing spring 8 constitute one support member in the present invention. Therefore, in this part, the support member has a reversing spring 8.
  • the leg portions 2c to 2f support the metal plate 2
  • the fulcrum is located at a portion between the leg portions 2c to 2f and the flat plate portion of the metal plate 2.
  • the reversing spring 8 is located immediately below one fulcrum.
  • the reversal spring 8 is preferably located immediately below the fulcrum.
  • a pressing load P is applied to the piezoelectric power generation element 3 from above as indicated by an arrow in FIG.
  • This pressing load P is preferably applied to the center of a region surrounded by a plurality of support portions.
  • a point to which the pressing load P is applied is a pressing point A shown in FIG.
  • the piezoelectric power generating element 3 is deformed as shown in FIG. That is, the second main surface 2b of the metal plate 2 of the piezoelectric power generation element 3 is bent so as to protrude downward in FIG.
  • the reversing spring 8 is reversed as shown in FIG.
  • the reversing spring 8 is reversed when the pressing load becomes a certain magnitude. This will be described in detail with reference to FIG.
  • the horizontal axis of FIG. 3 shows the stroke S of the pressing point A when pressing the piezoelectric power generating element 3.
  • the vertical axis indicates the pressing load P required when pressing the piezoelectric power generation element 3.
  • FIG. 3 shows the load-stroke characteristics.
  • the piezoelectric power generating device 1 As shown in FIG. 3, as the distance that the pressing point A moves is increased, the load required to press the piezoelectric power generation element 3 increases. During this time, the piezoelectric power generating device 1 is reversed while the piezoelectric power generating element 3 is deformed because a part of the aforementioned pressing load is also applied to the leg 2e and the reversing spring 8, which are supporting members of the piezoelectric power generating element 3. An operation is performed in which the apex of the spring 8 gradually moves downward. However, at the timing when the pressing load reaches 5.3N, the reversing spring 8 is suddenly deformed, and the supporting force of the leg 2e is temporarily lost during the deformation process, so that the pressing load is reduced to 2.5N.
  • the reversing spring 8 When the pressing load reaches 2.5N, the reversing spring 8 is completely reversed as shown in FIG. When the reversing spring 8 is completely deformed, the leg 2e is supported again, and the load increases again.
  • the above-mentioned 5.3N is the peak load
  • 2.5N is the reverse completion load of the reverse spring 8. That is, the reversal spring 8 is reversed between the peak load and the reversal completion load, and the reversal operation is completed at the reversal completion load.
  • the specification of the reversing spring 8 is set so that the reversing spring 8 is reversed when the pressing load applied to the piezoelectric power generation element 3 becomes a pressing load capable of taking out necessary power. Accordingly, it is possible to reliably apply a pressing load necessary for taking out electric power to the piezoelectric power generation element 3.
  • the load applied to the reversing spring 8 can be detected by a load sensor, and the timing at which the load is suddenly reduced can be known from the peak load.
  • the timing of the reversing spring 8 may be set so that a pressing load necessary for power generation is applied to the piezoelectric power generation element by this timing. This timing setting can be easily achieved by selecting the size, thickness, material and the like of the reversing spring 8.
  • a reversing spring 8 having a peak load P1 and a reversal completion load P2 shown in FIG. 4 may be used.
  • a reversing spring having a peak load P1 'larger than the peak load P1 and a reversal completion load P2' larger than the reversal completion load P2 may be used.
  • the load applied to the reversal spring is detected by a load sensor or the like, for example, the difference ⁇ P between the peak load P1 and the reversal completion load P2 shown in FIG. And detecting the difference ⁇ P ′ from P2 ′.
  • the piezoelectric power generation device described in Patent Document 1 described above has a problem that power generation efficiency is low. This is because the elastic body is disposed immediately below the pressing point. Therefore, a total load of a load necessary for deforming the piezoelectric power generation element and a load for compressing the elastic body is necessary as the pressing load.
  • the reversing spring 8 is provided on the support member and is located immediately below the fulcrum described above. Therefore, only by applying a load necessary for deforming the piezoelectric power generating element as the pressing load, two operations of reversing the reversing spring can be achieved at the same time while the piezoelectric power generating element is deformed. Therefore, the power generation efficiency per load ⁇ stroke can be increased.
  • FIG. 5 is a schematic front cross-sectional view showing a piezoelectric power generation device according to a second embodiment of the present invention.
  • reversal springs 8 and 8 are provided below both leg portions 2c and 2e.
  • a reversing spring is also provided below the leg portions 2d and 2f shown in FIG. That is, the lower ends of all the leg portions 2c to 2f are in contact with the vertex of the reversing spring 8.
  • the piezoelectric power generation device 21 is the same as the piezoelectric power generation device 1.
  • each of the plurality of leg portions 2c to 2f and one reversing spring 8 constitute each support member.
  • FIG. 6 is a schematic front sectional view of a piezoelectric power generator according to a third embodiment of the present invention.
  • the piezoelectric power generation device 31 has a case member 32.
  • the case member 32 includes a bottom plate 33 and a side wall 34 protruding upward from the upper surface of the bottom plate 33.
  • the piezoelectric power generation element 3 is configured in the same manner as the piezoelectric power generation element 3 of the first embodiment. But the lower end of the leg part 2c is contact
  • the step portion 34 a is provided at an intermediate height position on the inner surface of the side wall 34.
  • the leg 2d shown in FIG. 1B is also supported by a similar stepped portion.
  • the lower part of the step part 34a of the leg part 2c and the side wall 34 constitutes one support member.
  • the lower end of the leg 2e is connected to the lever member 35.
  • the lever member 35 is made of a rigid material such as metal or ceramics.
  • One end of the lever member 35 is connected to the side wall 34 by a connecting pin 36, and the lever member 35 is rotatably connected around the connecting pin 36.
  • the lower end side of the lever member 35 has a protruding portion 35a protruding toward the reversing spring 8 side.
  • the tip of the protrusion 35 a is in contact with the upper surface of the reversing spring 8.
  • the lower end of the leg portion 2 e is in contact with or connected to the upper surface of the lever member 35.
  • a portion where the leg 2e is connected to or brought into contact with the lever member 35 is a force point.
  • a pressing load is applied toward the metal plate 2 at the center of the piezoelectric power generation element 3 as indicated by the arrow in FIG.
  • the leg portion 2e applies a pressing force downward at a portion where the leg portion 2e is connected to or in contact with the lever member 35.
  • the lever member 35 rotates with the portion where the connecting pin 36 is provided as a fulcrum.
  • the fulcrum of the lever member 35 is a fulcrum supporting the piezoelectric power generation element 3.
  • tip of the protrusion part 35a becomes an action point.
  • the lever ratio is the ratio of the distance between the fulcrum and the force point: the distance between the fulcrum and the action point.
  • This lever ratio is preferably in the range of 2: 1 to 1: 3.
  • an appropriate load can be applied to the reversing spring 8 in order to reverse the reversing spring 8 according to the pressing load applied to the piezoelectric power generating element 3.
  • the piezoelectric layer 4 in the piezoelectric power generation element 3 is not easily broken.
  • points P1 and P2 indicate loads at which the operating force of the reversing spring 8 is generated when the lever ratio is small and when the lever ratio is large. Therefore, it can be seen that by adjusting the lever ratio, the timing of completion of the pressing operation necessary for power generation can be adjusted.
  • FIGS. 10 and 11 are an exploded perspective view of a piezoelectric power generating apparatus according to the fourth embodiment of the present invention and a front cross-sectional view showing the main part thereof.
  • the piezoelectric power generation device 41 of this embodiment corresponds to an example of a more specific structure of the piezoelectric power generation device 31 of the third embodiment.
  • the piezoelectric power generation device 41 has a case 42.
  • the case 42 has a bottom plate 43 and side walls 44.
  • a part of the inner surface of the side wall 44 is provided with a protruding portion that protrudes inward.
  • a plurality of stepped portions 44 a extending in parallel with the bottom plate 43 are provided on the upper surface of the protruding portion.
  • a circuit member 45 for driving the piezoelectric power generation element 3x is provided. 10 and 11, the circuit member 45 is schematically shown.
  • the piezoelectric power generation element 3x includes a plurality of metal plates 2x and piezoelectric elements 10x stacked on one surface of the metal plate 2x. In the center of the surface of the metal plate 2x opposite to the surface on which the piezoelectric element 10x is laminated, the cylindrical first protrusion 2m protrudes on the opposite side of the piezoelectric element 10x so as to be perpendicular to the surface direction. Is provided.
  • the second protrusion 2n is provided to protrude to the opposite side of the piezoelectric element 10x so as to be perpendicular to the surface direction. Yes.
  • a plurality of protrusions 2h to 2k are provided on the peripheral edge of the surface of the metal plate 2x opposite to the surface on which the piezoelectric elements 10x are laminated.
  • the plurality of projecting portions 2h to 2k are provided so as to project on the side opposite to the piezoelectric element 10x.
  • the plurality of protrusions 2h to 2k are provided at each corner of the rectangular metal plate 2x.
  • a peripheral part points out things other than the location in which the 1strium
  • the piezoelectric power generating element 3x is formed by laminating a plurality of laminated bodies having the metal plate 2x as an upper surface and the piezoelectric element 10x as a lower surface.
  • the piezoelectric power generating element 3x of this embodiment can obtain larger electric power because the plurality of metal plates 2x and the plurality of piezoelectric elements 10x are laminated.
  • a pressing member 46 is disposed on the second protrusion 2n of the uppermost metal plate 2x.
  • the pressing member 46 is made of ceramic or metal.
  • the pressing member 46 has a flat plate portion 46a and a plurality of protruding portions 46b to 46d protruding downward from the flat plate portion 46a.
  • the central protrusion 46c acts as a pressing protrusion that presses the piezoelectric power generating element 3x.
  • the tip of the protrusion 46c may be in contact with the uppermost metal plate 2x or may be separated from the piezoelectric power generation element 3x so as to be pressed when pressed.
  • tip of the protrusion part 46c which comprises the protrusion part for a press is provided so that it may contact
  • the lowermost metal plate 2x is disposed on the stepped portion 44a, and the lower portions of the protruding portions 2h and 2k of the metal plate 2x are supported by the stepped portion 44a. Accordingly, the portion of the case 42 where the stepped portion 44a is provided constitutes one support member.
  • the step 44a may be supported not by the lowermost metal plate 2x but by the lowermost piezoelectric element 10x.
  • a lever member 47 is provided so as to extend in the width direction of the case 42.
  • the lever member 47 has a bent portion 47c.
  • a pair of portions extending toward the connecting pin 49 from the bent portion 47 c are provided in the width direction of the case 42.
  • the portion on the opposite side of the bent portion 47c from the portion extending toward the connecting pin 49 is provided so as to reach almost the entire width of the case 42 in the width direction.
  • a lever member may be provided independently on one end side and the other end side in the width direction of the case 42.
  • the lever member 47 extends obliquely downward outside the bent portion 47c.
  • An end of the extended portion is rotatably connected to the case 42 via a connecting pin 49. Therefore, the portion where the connecting pin 49 is provided constitutes a fulcrum.
  • the upper end of the protrusion 47a described above serves as a force point for applying a pressing force to the lever member 47 when the piezoelectric power generating element 3x is pressed.
  • a protruding portion 47b protruding downward is provided in the vicinity of the end opposite to the fulcrum of the lever member 47.
  • the tip of the protruding portion 47 b is in contact with the reversing spring 8.
  • a portion where the protruding portion 47b is in contact with the reversing spring 8 is an action point.
  • the protruding portions 2h to 2k of the metal plate 2x are in contact with the upper metal plate 2x.
  • the protrusions 2h to 2k in the uppermost metal plate 2x are in contact with the protrusions 46c described above.
  • the piezoelectric power generating element 3x is supported by the support member including the stepped portion 44a described above and also supported by the connecting portion with the lever member 47. Therefore, also in the present embodiment, the reversing spring 8 and the lever member 47 constitute one support member.
  • the support member supporting the piezoelectric power generation element does not have to have a leg portion extending downward, and the flat plate portion of the metal plate is It may be supported directly by the support member.
  • the operating force of the reversing spring 8 can be easily adjusted by adjusting the lever ratio in the lever member 47.
  • the pressing member 46 presses the metal plate 2x of the piezoelectric power generation element 3x. That is, the pressing load is applied from the metal plate 2x side to the piezoelectric element 10x side of the piezoelectric power generation element 3x.
  • the polarization axis direction of the piezoelectric element 10x is, for example, a direction from the metal plate 2x toward the piezoelectric element 10x. Therefore, by applying a voltage in the same direction as the polarization axis direction of the piezoelectric element 10x, it is possible to prevent the generation efficiency from deteriorating due to polarization being depolarized by a pressing load from a different direction. Therefore, the power generation efficiency can be further increased.

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  • Manufacturing & Machinery (AREA)
  • General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)

Abstract

La présente invention concerne un dispositif de génération d'énergie piézo-électrique qui possède une efficacité de génération d'énergie élevée, pour lequel il est possible de connaître le temps de fin de compression, et pour lequel un corps piézo-électrique n'est pas aisément endommagé. Ce dispositif de génération d'énergie piézo-électrique 1 est équipé de : un élément de génération d'énergie piézo-électrique 3 dans lequel un élément piézo-électrique de type plaque 10 est disposé sur une surface d'une plaque métallique 2 ; et des éléments de support multiples soutenant l'élément de génération d'énergie piézo-électrique 3. Au moins un des éléments de support multiples comporte un ressort inverseur 8. Le ressort inverseur 8 possède une propriété de récupération de forme, et est disposé de manière à subir un retournement sous l'effet de la charge de pression requise pour l'élément de génération d'énergie piézo-électrique 3 pour générer de l'énergie.
PCT/JP2016/086527 2015-12-15 2016-12-08 Dispositif de génération d'énergie piézo-électrique WO2017104530A1 (fr)

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JP2017556007A JP6489237B2 (ja) 2015-12-15 2016-12-08 圧電発電装置

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JP2015-243889 2015-12-15

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018056059A1 (fr) * 2016-09-26 2018-03-29 株式会社村田製作所 Dispositif de production d'énergie piézoélectrique, module de production d'énergie piézoélectrique et émetteur
CN110080957A (zh) * 2019-04-04 2019-08-02 上海工程技术大学 一种地铁站台阶行人踩踏压力发电装置

Citations (2)

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JP2003218418A (ja) * 2002-01-18 2003-07-31 Matsushita Electric Ind Co Ltd 圧電型発電器
JP2004266033A (ja) * 2003-02-28 2004-09-24 Taiheiyo Cement Corp 圧電装置

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JP2003218418A (ja) * 2002-01-18 2003-07-31 Matsushita Electric Ind Co Ltd 圧電型発電器
JP2004266033A (ja) * 2003-02-28 2004-09-24 Taiheiyo Cement Corp 圧電装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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CN110080957A (zh) * 2019-04-04 2019-08-02 上海工程技术大学 一种地铁站台阶行人踩踏压力发电装置

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