CN112117928A - Friction-piezoelectric-electromagnetic combined magnetic energy collecting device - Google Patents
Friction-piezoelectric-electromagnetic combined magnetic energy collecting device Download PDFInfo
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N1/00—Electrostatic generators or motors using a solid moving electrostatic charge carrier
- H02N1/04—Friction generators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/001—Energy harvesting or scavenging
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/005—Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K35/00—Generators with reciprocating, oscillating or vibrating coil system, magnet, armature or other part of the magnetic circuit
- H02K35/02—Generators with reciprocating, oscillating or vibrating coil system, magnet, armature or other part of the magnetic circuit with moving magnets and stationary coil systems
-
- 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
Abstract
The friction-piezoelectric-electromagnetic combined magnetic energy collecting device comprises a shell, wherein a top cover is arranged at the top of the shell, a base is arranged in the shell, a cantilever beam is fixed above the base, a permanent magnet is arranged at the end part of the cantilever beam, a piezoelectric material is arranged on the upper surface of the cantilever beam, and a first friction layer is arranged on the lower surface of the cantilever beam; an acrylic plate is arranged on the upper surface of the base, a third friction layer is arranged on the acrylic plate, and a second friction layer is arranged on the third friction layer; the top cover is provided with a coil. The invention realizes the high-efficiency utilization of energy by converting weak magnetic energy into mechanical energy and then converting the mechanical energy into electric energy. The energy can be supplied to components with low power consumption in the power system. The output of the device can provide direct current output for a portable and small sensor after full-bridge rectification so as to be used by component equipment. The self-powered clean energy system has huge application potential.
Description
Technical Field
The invention relates to a magnetic energy collecting device, in particular to a friction-piezoelectric-electromagnetic combined magnetic energy collecting device.
Background
With the arrival of industry 4.0, the technology of the internet of things plays a key role in collecting and analyzing information, realizing relevant aspects such as environmental monitoring and public safety, and has wider and wider application prospects in the aspect of power system intellectualization.
In the prior art, wireless sensor networks are mostly adopted in the internet of things technology, a large number of wireless sensor nodes are utilized to construct the networks in a self-organizing mode, real-time information in the surrounding environment is sensed through sensors in the networks, and then signals are analyzed and processed and then transmitted to observers. The technology is widely used in the fields of intelligent systems, real-time monitoring of power systems and the like. At present, the sensor nodes are mainly powered by large-capacity batteries, but with the construction of ubiquitous power Internet of things, the number of the sensors is increased geometrically, the installation environment is also more complicated, and the replacement and maintenance of the batteries are also very troublesome. This adds considerably to the post-maintenance costs. It is therefore desirable to find an independent, permanent power source for powering these devices. In the power system, the magnetic energy content is rich and widely distributed, and the characteristics of independence, persistence, no influence on other factors and the like are achieved, so that the collection of the magnetic energy of the stray magnetic field in the power system and the conversion of the magnetic energy into electric energy for supplying power to the power system wireless sensing monitoring network become an effective scheme for solving the problem of restricting the power system monitoring network energy.
At present, an electric field which changes radially exists around a high-voltage bus, and certain electric field energy can be obtained by utilizing the surrounding space to ground capacitance. The capacitive voltage divider is the most common way to collect electric field energy, but the method has large device volume and low power density, generally below mu Wcm-3, and is difficult to be put into practical use. Compared with electric field energy, the high-voltage bus also contains abundant magnetic field energy around the high-voltage bus, and is easier to collect and utilize. The coil energy taking based on electromagnetic induction is the most commonly used method for collecting magnetic field energy in a power system, and the method is simple in structure and easy to implement. However, the traditional coil energy collection mode has large volume and low power density, and is difficult to meet the power supply requirement of the future mass sensor.
Disclosure of Invention
The present invention is directed to solve the above problems, and an object of the present invention is to provide a friction-piezoelectric-electromagnetic composite magnetic energy collecting device, which can increase the output power density to meet the functional requirements of a sensor.
In order to achieve the purpose, the invention adopts the following technical scheme:
the friction-piezoelectric-electromagnetic combined magnetic energy collecting device comprises a shell, wherein a top cover is arranged at the top of the shell, a base is arranged in the shell, a cantilever beam is fixed above the base, a permanent magnet is arranged at the end part of the cantilever beam, a piezoelectric material is arranged on the upper surface of the cantilever beam, and a first friction layer is arranged on the lower surface of the cantilever beam; an acrylic plate is arranged on the upper surface of the base, a third friction layer is arranged on the acrylic plate, and a second friction layer is arranged on the third friction layer; the top cover is provided with a coil.
The invention has the further improvement that the top cover is provided with a wire binding column, the coil is wound on the wire binding column, and the lower end of the wire binding column is provided with a tray.
The invention is further improved in that the top cover and the base are made of acrylic materials.
The invention is further improved in that the first friction layer, the second friction layer and the third friction layer are all made of flexible materials.
The invention has the further improvement that the first friction layer is made of copper, aluminum, gold or silver, and the second friction layer is made of PDMS film, polystyrene, polyethylene, polypropylene, poly (diphenyl propane carbonate), polyethylene terephthalate, polyimide, polyvinyl chloride or polydimethylsiloxane; the third friction layer is made of metal, alloy or conductive oxide.
The invention is further improved in that the metal is gold, silver, aluminum, copper, iron, titanium or nickel; the alloy is aluminum alloy, titanium alloy, copper alloy or nickel alloy.
The invention has the further improvement that the cantilever beam is made of aluminum sheets, copper sheets, iron sheets, titanium sheets, silicon wafers or copper alloy sheets; the piezoelectric material is PVDF, ALN, PZT or ZnO; when the second friction layer is made of a PDMS film, the PDMS film is doped with nano ferroferric oxide powder.
A further development of the invention is that the coil is located directly above the permanent magnet.
The invention is further improved in that the acrylic plate is provided with a buffer layer, and the buffer layer is provided with a third friction layer.
The invention has the further improvement that the buffer layer is double-sided adhesive tape, powder puff or foam adhesive; the distance between the second friction layer and the first friction layer is 3-5 mm.
Compared with the prior art, the invention has the beneficial effects that:
1. the energy is utilized efficiently. The efficient utilization of energy is realized by converting weak magnetic energy into mechanical energy and converting the mechanical energy into electric energy. When the cantilever beam vibrates, the first friction layer and the second friction layer do not transfer charges in the original state, namely before the initial contact. When the movement response of the cantilever beam makes the second friction layer contact with the surface of the first friction layer, negative charge aggregation can be generated on the upper surface of the second friction layer, and positive charge aggregation can be generated on the surface of the first friction layer. When the two surfaces are momentarily separated, positive and negative triboelectric charges remain on the surfaces of the second frictional layer and the first frictional layer, inducing opposite charges at the back of the second frictional layer, but there is a potential difference between the first frictional layer and the second frictional layer, thus creating a bottom-to-top electron flow until the total release is complete to satisfy the overall electrical balance. The subsequent continued vibration reduces the gap distance between the first friction layer and the second friction layer again, so that the dipole moment in the gap is reduced, the potential difference between the first friction layer and the second friction layer is changed again, and the electron flow flows from the top to the bottom, so that the accumulated charges are eliminated, alternating current is formed, and the conversion from the vibration energy to the electric energy is completed. The friction nano generator has the advantages of high output voltage, small volume, light weight, stable performance and the like. When the cantilever beam is driven to vibrate by the force of the permanent magnet in the magnetic field, the piezoelectric material can do mechanical vibration along with the environment to generate strain, so that the distribution of positive and negative charges in the piezoelectric material is changed to generate a potential difference, and if the two ends of the piezoelectric material are connected into the circuit at the moment, the free charges in the circuit can directionally flow under the influence of the potential difference to form current.
2. The device has wide application. The energy can be supplied to components with low power consumption in the power system. The output of the device can provide direct current output for a portable and small sensor after full-bridge rectification so as to be used by component equipment, and the device has huge application potential in the field of self-powered clean energy systems.
Furthermore, the surface of the second friction layer is doped with the magnetic conductive nano ferroferric oxide powder for decoration, so that the charge density generated by the contact of the upper surface of the friction nano generator under the action of external force is improved, and the output performance of the generator is greatly improved.
Furthermore, the device has simple structure and lower manufacturing cost. The whole body of the shell is made of an acrylic plate structure, the material is low, and the manufacturing is convenient. The materials used by the device are all easily obtained and prepared raw materials.
Furthermore, the tray is used for fixing the coil, so that the coil is prevented from being dispersed, and the tray is convenient to manufacture.
Furthermore, the top cover and the base are made of acrylic materials, and the processing and the manufacturing are easy and convenient.
Drawings
Fig. 1 is a structural view of a friction-piezoelectric-electromagnetic composite magnetic energy collection device of the present invention;
FIG. 2 is an enlarged schematic view of a friction nanogenerator unit according to the invention;
FIG. 3 is a schematic view of the top, binding posts and circular tray structure of the present invention.
FIG. 4 is the output voltage of the friction nano-generator according to the present invention as a function of the magnetic field strength.
Fig. 5 is a schematic diagram of the variation of the output voltage of the piezoelectric generator with the intensity of the magnetic field in the present invention.
FIG. 6 is a schematic diagram of the friction nanogenerator and the piezoelectric generator unit of the invention charging a 220uF capacitor.
Figure 7 is a schematic of the current output of the electromagnetic generator unit of the present invention.
Fig. 8 is a functional schematic diagram of the combined type magnetic energy collection and temperature and humidity sensor in the invention.
In the figure, 1 is a shell, 2 is a coil, 3 is a cantilever beam, 4 is a permanent magnet, 5 is a piezoelectric material, 6 is a first friction layer, 7 is a base, 7a is a second friction layer, 7b is a third friction layer, 7c is a buffer layer, 1a is a top cover, 1b is a binding post, 1c is a tray, and 1d is an acrylic plate.
Detailed Description
In order to make the aforementioned features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. The detailed description is merely intended to facilitate an understanding of the invention, and the scope of the invention is not limited to the specific description in the specific embodiments. The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, 2, 3 and 4, the friction-piezoelectric-electromagnetic composite magnetic energy collection device of the present invention includes a housing 1, a base 7 is disposed in the housing 1, a top cover 1a is disposed on the top of the housing 1, a square friction nano generator is fixed on the base 7, and the friction nano generator is composed of two parts, namely, a vibration part and a power generation part. The vibration part consists of a cantilever beam 3, a permanent magnet 4 and a first friction layer 6, and the power generation part consists of an acrylic plate 1d, a buffer layer 7c, a second friction layer 7a (a high polymer film) and a third friction layer 7b (a copper foil). The cantilever beam 3, the permanent magnet 4 and the piezoelectric material 5 form a piezoelectric generator. The cantilever beam 3, the permanent magnet 4 and the coil 2 form an electromagnetic generator. The coil 2 is positioned directly above the permanent magnet 4.
The base 7 is sequentially provided with an acrylic plate 1d, a buffer layer 7c, a second friction layer 7a (high polymer film) and a third friction layer 7b (copper foil) from bottom to top.
The inner surface of the top cover 1a is fixed with a wire binding post 1b, the coil 2 is wound on the wire binding post 1b, and the lower surface of the wire binding post 1b is provided with a round tray 1 c. The tray 1c is used for fixing the coil 2, preventing the coil 2 from diverging and facilitating manufacturing. The top cover 1a and the base 7 are made of acrylic materials, and the processing and the manufacturing are easy and convenient.
The friction nano generator utilizes the fact that opposite charges are carried on the surfaces of two medium materials with different friction electric polarities due to the friction vibration effect, the two materials can be in contact separation under the action of external force, so that the charges are unevenly distributed, the charges are migrated, current can be generated when the medium surfaces are connected with an external circuit, and the conversion from vibration energy to electric energy is achieved.
The friction nano generator has the advantages of high output voltage and output power and no need of an external power supply. The first friction layer 6, the second friction layer 7a, the third friction layer 7b and the buffer layer 7c are made of flexible materials. Specifically, the degree of attraction of the first friction layer 6 and the second friction layer 7a to electric charges is different. The first friction layer 6 is a friction material selected to have a positive polarity, selected from polyamide nylon, wool and its fabrics, silk and its fabrics, paper, polyethylene glycol succinate, cotton and its fabrics, polyurethane elastomer, wood, hard rubber, acetate, rayon, polymethyl methacrylate, polyvinyl alcohol, polyester, copper, aluminum, gold, silver, steel or silicon. Copper, aluminum, gold, silver are used as their commonly used electrode materials. The material of the second friction layer 7a is a high molecular polymer insulating material, and may adopt PDMS film or friction materials most commonly used in the art, such as polystyrene, polyethylene, polypropylene, poly (diphenylpropane carbonate), polyethylene terephthalate, polyimide, polyvinyl chloride, or polydimethylsiloxane. The third friction layer 7b is made of conductive material, and can be made of metal, alloy or conductive oxide. The metal comprises gold, silver, aluminum, copper, iron, titanium or nickel; the alloy includes an aluminum alloy, a titanium alloy, a copper alloy, or a nickel alloy. The thicknesses of the first friction layer 6, the second friction layer 7a, and the third friction layer are all on the micrometer (μm) scale. The distance between the second friction layer 7a and the first friction layer 6 is 3-5 mm.
The surface of the second friction layer is preferably provided with magnetic conductive nano ferroferric oxide powder decorated. Taking out 10g of magnetic conductive nano material ferroferric oxide powder, placing the powder in a test tube, adding about 5mL of absolute ethyl alcohol, and carrying out ultrasonic oscillation for 15min to ensure that nano particles are uniformly distributed in an ethanol solution; putting all the ethanol mixed solution containing the nano-particles into 10g of PDMS, stirring uniformly, and then degassing in vacuum for 15min to remove bubbles; and then coating PDMS on a smooth mould according to needs, and finally, carefully peeling off the mould after heating and curing to form a film. Referring to fig. 2, the cantilever beam 3 is made of a material with a high young's modulus of elasticity, and includes an aluminum sheet, a copper sheet, an iron sheet, a titanium sheet, a silicon sheet, and a copper alloy sheet. Preferably, the titanium sheet with better elasticity is selected as the cantilever beam material. The upper surface of the cantilever beam 3 is attached with a piezoelectric material 5, and the lower surface is attached with a first friction layer 6. The piezoelectric material 5 comprises PVDF, ALN, PZT and ZnO, and the PVDF piezoelectric film is selected as the piezoelectric material 5. When the permanent magnet 4 is stressed in a magnetic field, the cantilever beam 3 is driven to vibrate, the piezoelectric material 5 can do mechanical vibration along with the environment to generate strain, so that the distribution of positive and negative charges in the piezoelectric material is changed to generate a potential difference, and if the two ends of the piezoelectric material are connected into a circuit at the moment, free charges in the circuit can directionally flow under the influence of the potential difference to form current.
The structure has the advantages of simple manufacture, high conversion efficiency, stable structure and easy adjustment of resonance frequency.
The preparation process of the device is as follows:
(1) the second friction layer 7a of the friction nano-generator is made of a PDMS film and is prepared as follows:
first, a PDMS gel was prepared. Placing a disposable beaker on an electronic balance, taking 15g of polydimethylsiloxane by using an injector, taking 1.5g of curing agent by using a dropper, and mixing the materials in a proportion of 10: 1, and a glass plate is used for clockwise primary stirring uniformly, then the mixture is placed in a magnetic stirrer and stirred for 15min at the rotating speed of 400r/min, so that polydimethylsiloxane and a curing agent are fully and uniformly mixed, and then the mixture is vacuumized in a vacuum box for 20min to remove bubbles in the mixture, so that PDMS colloid is obtained. Then, a film is manufactured using the mold. Taking out the vacuumized colloid from the vacuum machine, placing a silicon mold on a sucker of a glue homogenizing machine, homogenizing for 3 times at the rotating speed of 1000r/min after an air pump is opened, repeating the glue homogenizing when the colloid distribution on the mold is still uneven or bubbles exist through visual observation, taking down the mold and putting the mold into a drying box for drying if the colloid distribution is not even, drying the mold at 80 ℃ for 180min, and taking down the cured PDMS film after the drying and putting the PDMS film into a plastic box for later use.
(2) The preparation process of the second friction layer 7a of the friction nano-generator, namely the PDMS film containing 10g of ferroferric oxide powder, is as follows:
taking out 10g of magnetic conductive nano material ferroferric oxide powder, placing the powder in a test tube, adding about 5mL of absolute ethyl alcohol, and carrying out ultrasonic oscillation for 15min to ensure that nano particles are uniformly distributed in an ethanol solution; putting all the ethanol mixed solution containing the nano-particles into 10g of PDMS, stirring uniformly, and then degassing in vacuum for 15min to remove bubbles; and then coating PDMS on a smooth mould according to needs, and finally, carefully peeling off the mould after heating and curing to form a film.
(3) The preparation process of the friction nano generator unit TENG is as follows: firstly, the prepared PDMS film is cut into squares with the length of 3cm, the width of 3cm and the thickness of 100 um. And then adhering the PDMS film on copper foils with the same size, and adhering the copper foils adhered with the PDMS on an acrylic plate, wherein the copper foils are used as electrode layers. And the copper foil is adhered to the bottom of the middle cantilever beam to serve as the other electrode and the friction layer, so that the basic friction nano generator unit is manufactured. .
(4) The process for preparing the EMG of the electromagnetic generator unit is as follows: first, a copper coil (1000 turns, a copper wire having a diameter of 0.01 mm) is fixed to the binding post 1 b. And the permanent magnet 4 at the tail end of the middle cantilever beam 3 forms an electromagnetic generator EMG.
(5) The piezoelectric generator PENG is prepared by the following steps: firstly, utilizing linear cutting to manufacture the outline of the base of the cantilever beam 3; then, the contact surface of the substrate and the piezoelectric material electrode is lightly polished by using fine sand paper, so that the roughness of the contact surface is increased, and the bonding effect is enhanced; cleaning the surfaces of the substrate material and the piezoelectric material electrode by using acetone to remove dust and oil stains on the surfaces; secondly, cleaning with ethanol to remove the organic solvent on the surface; uniformly mixing the acrylic acid structure AB glue, smearing a proper amount of the acrylic acid structure AB glue on the contact surface of the electrode layer and the substrate after a moment, and bonding the piezoelectric material 5 on the surface of the cantilever beam 3; and maintaining the pressure by using a clamp, putting the mixture into an incubator for 24 hours, and taking the mixture out. The tail end permanent magnet 4, the cantilever beam 3 and the piezoelectric material 5 jointly form a piezoelectric generator PENG.
The working principle of the device is as follows:
the friction-piezoelectric-electromagnetic energy collecting device can convert weak magnetic energy into electric energy. The working principle of the friction nanometer generator unit TENG is as follows: when the cantilever beam 3 vibrates, the first friction layer 6 and the second friction layer 7a do not transfer charges in the original state, i.e., before the initial contact. When the movement response of the cantilever 3 makes the second friction layer 7a (i.e., the PDMS film) and the surface of the first friction layer 6 contact, negative charge accumulation occurs on the upper surface of the second friction layer 7a (the PDMS film), and positive charge accumulation occurs on the surface of the first friction layer 6. When the two surfaces are separated instantaneously, the positive and negative triboelectric charges remain on the surfaces of the second friction layer 7a (PDMS) and the first friction layer 6 (aluminum foil), so that opposite charges are induced at the back of the second friction layer 7a (PDMS film), but at this time, there is a potential difference between the first friction layer 6 and the second friction layer 7a, and thus electron flow from bottom to top is generated until the total release meets the overall electrical balance. The subsequent continued vibration reduces the gap distance between the first friction layer 6 and the second friction layer 7a again, so that the dipole moment in the gap is reduced, the potential difference between the first friction layer 6 and the second friction layer 7a is changed again, and the electron flow flows from the top to the bottom, so that the accumulated charges are eliminated, alternating current is formed, and the conversion of the vibration energy into electric energy is completed. The friction nano generator has the advantages of high output voltage, small volume, light weight, stable performance and the like. Furthermore, the voltage between the two electrodes of the conducting-dielectric material contact-separation mode triboelectric nanogenerator unit TENG can be expressed as:
where V is the potential difference between the two electrodes, Q is the transfer charge between the two layers, S is the area size of the electrodes, is the dielectric constant of the PDMS film, 0 is the dielectric constant of the free space, d is the thickness of the PDMS film, and x is the separation distance between the Al foil and the PDMS film, which is the triboelectric charge density.
The working principle of the piezoelectric generator PENG is as follows: when the cantilever beam 3 is driven to vibrate by the force of the permanent magnet 4 in the magnetic field, the piezoelectric material 5 can do mechanical vibration along with the environment to generate strain, so that the distribution of positive and negative charges in the piezoelectric material 5 is changed to generate a potential difference, and if the two ends of the piezoelectric material 5 are connected into a circuit at the moment, the free charges in the circuit can directionally flow under the influence of the potential difference to form current.
The device comprises three power generation units, namely a friction nanometer generator, a piezoelectric generator and an electromagnetic generator, and can greatly improve the output power.
The performance test was as follows:
in order to show the unique advantages of the friction-piezoelectric-electromagnetic energy collector for weak magnetic energy collection, the output characteristics of a piezoelectric generator PENG and a friction nanometer generator unit TENG under different magnetic field strengths at 50Hz power frequency are tested. As shown in fig. 5 and 6. The contact separation distance was 3mm and the contact area was 4cm2. The output voltage shows an upward trend with the increase of the magnetic field strength. The TENG output voltage can reach up to 250Vpp at 16 Oe. The charging characteristics of the friction nano-generator unit TENG, the piezoelectric generator PENG and the combination of the two are respectively tested by changing the capacitance to 220 muF, and the results can be seen in the figure that the capacitance is charged to 0.5V, the friction nano-generator needs about 20s, the piezoelectric material needs 5s when the voltage is charged to 2V, and after the combination, the charging characteristics are respectively testedOnly 2.5 seconds is needed, which on the other hand demonstrates that the output performance is improved after the piezoelectric material is compounded with the triboelectric material. The electrical output of the EMG is shown in fig. 7. Therefore, the friction-piezoelectric-electromagnetic composite energy collecting device can collect weaker magnetic field energy.
The research result shows that the device can charge a large capacitor within a certain time and can provide energy for some equipment with lower power consumption. As shown in fig. 8, the output end of the magnetic energy collector is connected to devices such as a temperature and humidity sensor, and the measured magnetic energy collector can continue to function as the temperature and humidity sensor after being charged for 5 seconds for 1mF capacitor. The device has potential application value in the aspects of power supply of a power system sensor and the like.
The invention is suitable for collecting weak magnetic energy around the cable, and has the characteristics of simple manufacture, lower cost and high conversion efficiency.
Claims (10)
1. The friction-piezoelectric-electromagnetic combined magnetic energy collecting device is characterized by comprising a shell (1), wherein a top cover (1a) is arranged at the top of the shell (1), a base (7) is arranged in the shell (1), a cantilever beam (3) is fixed above the base (7), a permanent magnet (4) is arranged at the end part of the cantilever beam (3), a piezoelectric material (5) is arranged on the upper surface of the cantilever beam (3), and a first friction layer (6) is arranged on the lower surface of the cantilever beam (3); the upper surface of the base (7) is provided with an acrylic plate (1d), the acrylic plate (1d) is provided with a third friction layer (7b), and the third friction layer (7b) is provided with a second friction layer (7 a); the top cover (1a) is provided with a coil (2).
2. The friction-piezoelectric-electromagnetic combined magnetic energy collection device according to claim 1, wherein a binding post (1b) is provided on the top cover (1a), the coil (2) is wound around the binding post (1b), and a tray (1c) is provided at a lower end of the binding post (1 b).
3. The friction-piezoelectric-electromagnetic combined magnetic energy collection device according to claim 1, wherein the top cover (1a) and the base (7) are made of acrylic material.
4. The friction-piezoelectric-electromagnetic combined magnetic energy collection device according to claim 1, wherein the first friction layer (6), the second friction layer (7a) and the third friction layer (7b) are all made of flexible materials.
5. The friction-piezoelectric-electromagnetic combined type magnetic energy collection device according to claim 1 or 4, wherein the first friction layer (6) is made of copper, aluminum, gold or silver, and the second friction layer (7a) is made of PDMS film, polystyrene, polyethylene, polypropylene, poly (diphenylpropane carbonate), polyethylene terephthalate, polyimide, polyvinyl chloride or polydimethylsiloxane; the third friction layer (7b) is made of metal, alloy or conductive oxide.
6. The friction-piezoelectric-electromagnetic composite magnetic energy collection device according to claim 5, wherein the metal is gold, silver, aluminum, copper, iron, titanium or nickel; the alloy is aluminum alloy, titanium alloy, copper alloy or nickel alloy; when the second friction layer (7a) is made of a PDMS film, the PDMS film is doped with nano ferroferric oxide powder.
7. The friction-piezoelectric-electromagnetic combined magnetic energy collecting device according to claim 1, wherein the cantilever beam (3) is made of an aluminum sheet, a copper sheet, an iron sheet, a titanium sheet, a silicon sheet or a copper alloy sheet; the piezoelectric material (5) is PVDF, ALN, PZT or ZnO.
8. The friction-piezoelectric-electromagnetic composite magnetic energy collection device according to claim 1, wherein the coil (2) is located right above the permanent magnet (4).
9. The friction-piezoelectric-electromagnetic combined type magnetic energy collection device according to claim 1, wherein a buffer layer (7c) is provided on the acrylic plate (1d), and a third friction layer (7b) is provided on the buffer layer (7 c).
10. The friction-piezoelectric-electromagnetic composite magnetic energy collection device according to claim 9, wherein the buffer layer (7c) is a double-sided tape, a puff or a foam; the distance between the second friction layer (7a) and the first friction layer (6) is 3-5 mm; .
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| CN113270933A (en) * | 2021-06-28 | 2021-08-17 | 上海大学 | Triboelectricity-electromagnetism composite energy collecting device based on paper folding structure |
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