CN112421985A - Sectional type bimorph piezoelectricity-electromagnetism complex energy accumulator - Google Patents

Sectional type bimorph piezoelectricity-electromagnetism complex energy accumulator Download PDF

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Publication number
CN112421985A
CN112421985A CN202011437695.1A CN202011437695A CN112421985A CN 112421985 A CN112421985 A CN 112421985A CN 202011437695 A CN202011437695 A CN 202011437695A CN 112421985 A CN112421985 A CN 112421985A
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CN
China
Prior art keywords
piezoelectric
horizontal
cantilever beam
upright post
magnet
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Pending
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CN202011437695.1A
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Chinese (zh)
Inventor
单小彪
隋广东
闵兆伟
谢涛
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Harbin Institute of Technology
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Harbin Institute of Technology
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Priority to CN202011437695.1A priority Critical patent/CN112421985A/en
Publication of CN112421985A publication Critical patent/CN112421985A/en
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02NELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N2/00Electric machines in general using piezo-electric effect, electrostriction or magnetostriction
    • H02N2/18Electric machines in general using piezo-electric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators
    • H02N2/186Vibration harvesters
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K35/00Generators with reciprocating, oscillating or vibrating coil system, magnet, armature or other part of the magnetic circuit
    • H02K35/02Generators with reciprocating, oscillating or vibrating coil system, magnet, armature or other part of the magnetic circuit with moving magnets and stationary coil systems

Abstract

The invention discloses a sectional type bimorph piezoelectric-electromagnetic composite energy harvester, belongs to the technical field of vibration energy harvesting, and aims to solve the problem that when a traditional piezoelectric-electromagnetic energy harvester bends and vibrates at the second order of a cantilever beam, charges of piezoelectric sheets on one side of the cantilever beam are offset, and a suspended magnet limits a motion track by adopting a linear bearing, so that the output of the piezoelectric-electromagnetic energy harvester is more stable and efficient. One end of the horizontal piezoelectric cantilever beam is connected with the left upright post of the fixed support base through the connecting plate, the upper surface and the lower surface of the other end of the horizontal piezoelectric cantilever beam are respectively connected with a magnet, the upper cross beam lower surface and the lower cross beam upper surface of the right upright post of the fixed support base are respectively connected with a magnet and a coil assembly, and the magnets are respectively suspended inside the two coil assemblies. The sectional type bimorph piezoelectric-electromagnetic composite energy harvester has the advantages of novel structure and flexible design, provides a method for attaching the piezoelectric plate in sections at the second-order bending vibration nodes on the upper surface and the lower surface of the horizontal piezoelectric cantilever beam, and has the advantage of improving the energy harvesting efficiency and performance.

Description

Sectional type bimorph piezoelectricity-electromagnetism complex energy accumulator
Technical Field
The invention relates to a piezoelectric-electromagnetic composite energy harvester, in particular to a sectional type bicrystal piezoelectric-electromagnetic composite energy harvester, and belongs to the technical field of vibration energy harvesting.
Background
At present, the rapid development of portable electronic equipment, micro-electro-mechanical systems (MEMS) and wireless communication technologies has led to increasingly stringent technical requirements for microelectronic products. Most of microelectronic products supply electric energy by using a traditional battery, and the use of the microelectronic products in a battlefield or a space is limited due to the defect that the traditional battery needs to be replaced or charged regularly during power supply.
The vibration capture energy is a technology of converting vibration mechanical energy in the environment into electric energy meeting the requirements of a micro system, and can be classified into electromagnetic type, piezoelectric type, electrostatic type and the like according to different energy conversion mechanisms. In the prior art, most of vibration energy harvesting devices are single-crystal piezoelectric energy harvesting devices or double-crystal piezoelectric energy harvesting devices with piezoelectric sheets continuously distributed on a cantilever beam, and the arrangement form is single. Research shows that the piezoelectric type and electromagnetic type energy harvester both have higher electromechanical coupling coefficient and do not need an external power supply, so that the piezoelectric-electromagnetic composite energy harvester is beneficial to improving the energy harvesting efficiency and widening the frequency compared with a single-mode energy harvester. Piezoelectric-electromagnetic Hybrid harvesters such as those proposed in the document "Karami M A, Inman D J. nonlinear Hybrid Energy Harvesting a Piezo-magnetic-elastic spring [ C ]. Proceedings of SPIE, 2010.76430U". Although the structure has a better energy harvesting effect, the piezoelectric sheets are continuously distributed on the cantilever beam, so that when the cantilever beam bends at the second order, the piezoelectric sheets on one side of the cantilever beam have both tensile strain and compressive strain, charges with opposite polarities are generated, and the opposite charges are mutually offset, so that the energy harvesting effect is influenced. Therefore, the conventional piezoelectric plate arrangement mode has the defect of low energy harvesting efficiency during second-order bending vibration. Moreover, the electromagnetic energy capturing part of the composite energy harvester mentioned in the literature only works by one pair of magnets, so that the maximum energy production of the structure is limited.
Disclosure of Invention
The invention aims to provide a sectional bimorph piezoelectric-electromagnetic composite energy harvester, which solves the problem that when the traditional piezoelectric-electromagnetic energy harvester bends and vibrates at the second order of a cantilever beam, a piezoelectric sheet at one side of the cantilever beam generates charge cancellation, and a magnet suspended in an electromagnetic energy harvesting part adopts a linear bearing to limit the motion track of the magnet, so that the output of the magnet is more stable and efficient.
A segmented bimorph piezoelectric-electromagnetic composite energy harvester comprises a fixed support base, a horizontal piezoelectric cantilever beam, a magnet and a coil assembly;
one end of the horizontal piezoelectric cantilever beam is connected with the left upright post of the fixed support base through the connecting plate, the upper surface and the lower surface of the other end of the horizontal piezoelectric cantilever beam are respectively connected with a magnet, the upper surface of the upper cross beam and the upper surface of the lower cross beam of the right upright post of the fixed support base are respectively connected with a magnet and a coil assembly, and the magnet inside the coil assembly is always positioned inside the linear bearing of the coil assembly under the action of the repulsive force of the magnet on the horizontal piezoelectric cantilever beam and the magnets of the upper cross beam and the lower cross beam.
Preferably: the fixed supporting base comprises a flat plate, a left upright post and a right upright post, wherein the left upright post and the right upright post are respectively and fixedly installed on the flat plate.
Preferably: the left stand right surface is opened there is the connecting plate mounting groove, and the inslot is opened there are six horizontal screw holes, and the vertical face accessible bolt and nut of connecting plate is connected with left stand.
Preferably: the horizontal piezoelectric cantilever beam comprises a horizontal elastic matrix and horizontal piezoelectric patches, the horizontal piezoelectric patches are respectively divided into two sections on the upper surface and the lower surface of the horizontal elastic matrix for attachment, the disconnection position of the horizontal piezoelectric patches on the same surface is the node position of the second-order bending vibration of the horizontal piezoelectric cantilever beam, and the horizontal piezoelectric cantilever beam is connected with the horizontal surface of the connecting plate through bolts and nuts.
Preferably: the coil component comprises coil supports, metal coils and linear bearings, the metal coils are wound on the outer surfaces of the coil supports, the two coil supports are connected to the upper cross beam and the lower cross beam of the right stand column through bolts and nuts respectively, and the linear bearings are in transition fit with the middle positions of the inner surfaces of the coil supports.
Compared with the existing product, the invention has the following effects:
1. the sectional type bicrystal piezoelectric-electromagnetic composite energy harvester has novel structure and flexible design, provides a method for attaching piezoelectric sheets in sections at second-order bending vibration nodes on the upper and lower surfaces of a horizontal piezoelectric cantilever beam, can avoid the offset loss of electric quantity and increase the energy harvesting efficiency;
2. the composite energy harvester replaces the mass blocks which play the roles of reducing the frequency and increasing the deformation at the tail end of the horizontal piezoelectric cantilever beam with two groups of independent suspension type electromagnetic energy harvesters, and the model uses the magnetic repulsion force to suspend the generated magnet, thereby avoiding the contact of parts existing in the currently researched energy harvesters, reducing the energy dissipation of the energy harvester in the working process, having small damping, good power generation effect and high efficiency; meanwhile, the electromagnetic power generation system is a nonlinear power generation system, the broadband effect of the nonlinear system is better than that of a linear system, and a power generation peak value can be generated at a certain frequency; if the structure size is adjusted, the peak value of the piezoelectric system can be matched with the peak value of the piezoelectric system, so that the composite power generation device can generate higher output energy in a larger frequency range. Therefore, the broadband of the energy harvester is realized by respectively utilizing two different power generation mechanisms.
Drawings
FIG. 1 is a schematic structural diagram of a segmented bimorph piezoelectric-electromagnetic composite energy harvester;
FIG. 2 is a schematic structural view of a mounting base;
FIG. 3 is a schematic view of the installation of a horizontal piezoelectric cantilever;
FIG. 4 is an enlarged view at A of FIG. 3;
FIG. 5 is a schematic structural view of a coil assembly;
in the figure: the piezoelectric sensor comprises a fixed support base 1, a horizontal piezoelectric cantilever beam 2, a magnet 3, a coil assembly 4, a flat plate 5, a left upright post 6, a right upright post 7, an upper cross beam 8, a lower cross beam 9, a connecting plate mounting groove 10, a horizontal threaded hole 11, a connecting plate 12, a horizontal piezoelectric plate 13, a horizontal elastic matrix 14, a metal coil 15, a coil support 16 and a linear bearing 17.
Detailed Description
Preferred embodiments of the present invention are explained in detail below with reference to the accompanying drawings.
As shown in fig. 1 to 5, the segmented bimorph piezoelectric-electromagnetic composite energy harvester of the invention comprises a fixed support base 1, a horizontal piezoelectric cantilever beam 2, a magnet 3 and a coil assembly 4;
one end of the horizontal piezoelectric cantilever beam 2 is connected with the left upright post 6 of the fixed support base 1 through the connecting plate 12, the upper surface and the lower surface of the other end of the horizontal piezoelectric cantilever beam 2 are respectively connected with a magnet 3, the lower surface of the upper cross beam 8 and the upper surface of the lower cross beam 9 of the right upright post 7 of the fixed support base 1 are respectively connected with a magnet 3 and a coil component 4, the coil component 4 is respectively connected with the upper cross beam 8 and the lower cross beam 9 through bolts and nuts, and the magnet 3 inside the coil component 4 is always positioned inside the linear bearing 17 of the coil component 4 under the repulsive force action of the magnet 3 on the horizontal piezoelectric cantilever beam 2 and the magnet 3 on the upper cross beam 8 and the lower.
Further: the fixed supporting base 1 comprises a flat plate 5, a left upright post 6 and a right upright post 7, wherein the left upright post 6 and the right upright post 7 are respectively and fixedly installed on the flat plate 5.
Further: the right surface of the left upright post 6 is provided with a connecting plate mounting groove 10, six horizontal threaded holes 11 are formed in the groove, and the vertical surface of the connecting plate 12 can be connected with the left upright post 6 through bolts and nuts.
Further: the horizontal piezoelectric cantilever beam 2 comprises a horizontal elastic matrix 14 and horizontal piezoelectric patches 13, the horizontal piezoelectric patches 13 are respectively attached to the upper surface and the lower surface of the horizontal elastic matrix 14 in two sections, the broken part of the horizontal piezoelectric patches 13 on the same surface is the node position of the second-order bending vibration of the horizontal piezoelectric cantilever beam 2, and the horizontal piezoelectric cantilever beam 2 is connected with the horizontal surface of the connecting plate 12 through bolts and nuts.
Further: the coil assembly 4 comprises a metal coil 15, coil supports 16 and linear bearings 17, wherein the metal coil 15 is wound on the outer surface of the coil support 16, the two coil supports 16 are respectively connected on the upper cross beam 8 and the lower cross beam 9 of the right upright post 7 through bolts and nuts, and the linear bearings 17 are in transition fit with the middle positions of the inner surfaces of the coil supports 16.
The shape of the magnet 3 is not limited, and may be a cylinder, a prism, a cone, a circular truncated cone, or the like.
The horizontal piezoelectric cantilever beam 2 forms a piezoelectric energy harvester, and the magnet 3 and the coil component 4 form an electromagnetic energy harvester.
The present embodiments are merely illustrative of the present patent and do not limit the scope of the patent, and those skilled in the art can make modifications to the parts thereof without departing from the spirit and scope of the patent.

Claims (5)

1. A sectional type bimorph piezoelectricity-electromagnetism complex energy accumulator which characterized in that: comprises a fixed support base (1), a horizontal piezoelectric cantilever beam (2), a magnet (3) and a coil component (4);
one end of the horizontal piezoelectric cantilever beam (2) is connected with a left upright post (6) of the fixed support base (1) through a connecting plate (12), the upper surface and the lower surface of the other end of the horizontal piezoelectric cantilever beam (2) are respectively connected with a magnet (3), the lower surface of an upper cross beam (8) and the upper surface of a lower cross beam (9) of a right upright post (7) of the fixed support base (1) are respectively connected with a magnet (3) and a coil assembly (4), the coil assembly (4) is respectively connected with the upper cross beam (8) and the lower cross beam (9) through bolt and nuts, and the magnet (3) inside the coil assembly (4) is always positioned inside a linear bearing (17) of the coil assembly (4) under the repulsive force action of the magnet (3) on the horizontal piezoelectric cantilever beam (2) and the magnet (3) of the upper cross beam (8) and the lower cross beam (.
2. The segmented bimorph piezoelectric-electromagnetic composite energy harvester according to claim 1, characterized in that: the fixed support base (1) comprises a flat plate (5), a left upright post (6) and a right upright post (7), wherein the left upright post (6) and the right upright post (7) are fixedly arranged on the flat plate (5) respectively.
3. The segmented bimorph piezoelectric-electromagnetic composite energy harvester according to claim 2, characterized in that: the left upright post (6) right surface is provided with a connecting plate mounting groove (10), six horizontal threaded holes (11) are formed in the groove, and the vertical surface of the connecting plate (12) can be connected with the left upright post (6) through bolts and nuts.
4. The segmented bimorph piezoelectric-electromagnetic composite energy harvester according to claim 3, characterized in that: the horizontal piezoelectric cantilever beam (2) comprises a horizontal elastic base body (14) and horizontal piezoelectric sheets (13), wherein the horizontal piezoelectric sheets (13) are respectively divided into two sections on the upper surface and the lower surface of the horizontal elastic base body (14) for attachment, the horizontal piezoelectric sheets (13) on the same surface are disconnected at the node position of second-order bending vibration of the horizontal piezoelectric cantilever beam (2), and the horizontal piezoelectric cantilever beam (2) is connected with the horizontal surface of the connecting plate (12) through bolts and nuts.
5. The segmented bimorph piezoelectric-electromagnetic composite energy harvester according to claim 4, characterized in that: the coil component (4) comprises a metal coil (15), coil supports (16) and linear bearings (17), wherein the metal coil (15) is wound on the outer surface of the coil supports (16), the two coil supports (16) are respectively connected to an upper cross beam (8) and a lower cross beam (9) of the right stand column (7) through bolts and nuts, and the linear bearings (17) are in transition fit with the middle position of the inner surface of the coil supports (16).
CN202011437695.1A 2020-12-10 2020-12-10 Sectional type bimorph piezoelectricity-electromagnetism complex energy accumulator Pending CN112421985A (en)

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CN113258827A (en) * 2021-05-10 2021-08-13 哈尔滨工业大学 Rotary piezoelectric and electromagnetic array combined energy harvester
CN113258826A (en) * 2021-05-10 2021-08-13 哈尔滨工业大学 Rotary magnetic force frequency modulation type laminated efficient piezoelectric energy harvester

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113258827A (en) * 2021-05-10 2021-08-13 哈尔滨工业大学 Rotary piezoelectric and electromagnetic array combined energy harvester
CN113258826A (en) * 2021-05-10 2021-08-13 哈尔滨工业大学 Rotary magnetic force frequency modulation type laminated efficient piezoelectric energy harvester

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