CN206041775U - Multi -frequency vibration energy recovery unit - Google Patents
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Abstract
The utility model belongs to the technical field of vibration energy recovery unit, specific multi -frequency vibration energy recovery unit who converts vibration energy into the electric energy that says so. This recovery unit includes magnetoelectric conversion subtotal energy collecting part, the magnetoelectric conversion part is including shell, extension spring, quality piece, inductance coils, energy collecting part includes the electrical energy storage circuit, the shell is the hollow casing of a rectangle, and inside evenly is provided with a plurality of cavitys, be provided with an extension spring in every cavity, extension spring sets up in the inside of shell, and wherein one end is fixed on the inboard upper portion of shell, and the other end links to each other with the quality piece, inductance coils sets up the outside at the quality piece, there is the permanent magnet quality piece inside, and quality piece and permanent magnet are in the inside vibration of inductance coils. The utility model relates to a can guarantee high efficiency in several kinds of typical vibration frequency of environment, solve present vibration energy and retrieved a structure multi -frequency vibration energy recovery unit to defects such as single frequency sensitivities.
Description
Technical Field
The utility model belongs to the technical field of the vibration energy recovery device, specific multi-frequency vibration energy recovery device with vibration energy conversion for electric energy that says so.
Background
With the rapid development of modern industry, environmental pollution and energy shortage are two major problems facing all countries in the world at present, and in order to solve the influence of energy crisis on economic development and people's life, all countries of science and technology workers begin to explore new green energy. Energy recovery refers to the process of taking outside energy and converting it into usable electrical energy.
In the past few years, portable devices, wireless sensors and micro-electromechanical systems MEMS have rapidly developed, and these devices or sensor systems are portable or distributed, thus requiring their own power supply. In most cases, these power sources are conventional batteries, but the battery power and useful life are limited. For these devices, replacing batteries creates many inconveniences; in addition, the batteries contain heavy metals, and the improper treatment of the waste batteries can cause serious environmental pollution. There is a pressing need for these systems to be capable of generating electrical energy for their own use. Although the energy collected in the environment is usually relatively small, with the rapid development of electronic technology, the integration of electronic products is continuously improved and the power consumption is continuously reduced, so that the energy recovered in the environment is enough for micro-power consumption systems.
The following energy acquisition sources are mainly used for acquiring external energy: solar energy, vibrational energy, noise, temperature gradients. The vibration is a common phenomenon in daily life of people, and because the functional density of the vibration has higher energy density for 1-year service life is 100-200 muW/cm 3, the energy recovery from the vibration of the surrounding environment is undoubtedly the most convenient and potential way.
At present, there are three main ways for the research of vibration energy recovery technology: electrostatic, electromagnetic, and piezoelectric piezo electric, wherein the fundamental principle behind which electromagnetic energy recovery devices operate is faraday's law of electromagnetic induction: when the magnetic flux passing through the closed loop, typically the area enclosed by the coil, changes, an induced electromotive force is generated in the loop. Thereby converting the mechanical energy of the ambient vibrations into electrical energy. According to different vibration parts, the electromagnetic vibration energy recovery device can be divided into three types of moving iron magnet vibration, moving coil vibration and iron coil co-vibration magnet coil common vibration.
The electromagnetic vibration power generation device 201210499462.3 developed by Zhejiang industrial university comprises a shell, a vibrator, an induction coil, a magnet yoke and a bracket.
The university of Jiangsu developed an electromagnetic vibration energy collector 201410016971.5 with adjustable power generation, which comprises an energy conversion device, a guide rail, a mass block and a magnet. The distance between the energy conversion device and the driven magnet is adjusted by rotating a knob of the adjustable platform, so that the acting force between the driving magnet and the driven magnet is adjusted, the vibration amplitude of the driven magnet is changed, and the purpose of adjusting the power generation power is achieved. The device has the advantages that the power generation power is adjustable, and the problem that the power generation power of most vibration energy collectors is single is solved.
An electromagnetic vibration generator 201310444325.4 developed by Hebei university of industry has the core components of a magnetic yoke, a vibration shaft and a shaft hub. Experiments show that when the frequency of the generator is 10Hz and the amplitude is 10mm, the peak value of the output voltage of the generator is 6V.
Based on the above analysis, in the conventional vibration energy collecting device, the vibration pickup mechanism only collects the vibration near the natural frequency, and the vibration acquisition capability far from the natural frequency is weak. Whereas ambient vibrations are typically composed of a series of vibration signals of different frequencies. The utility model discloses only to defects such as single frequency sensitivity to current vibration energy recovery structure, provide one kind and can all make the system have the energy recovery structure of excellent effect under different frequencies, the present case produces from this.
Disclosure of Invention
The utility model provides a multi-frequency vibration energy recovery device, efficient collection vibration energy in several kinds of typical vibration frequency of environment can be guaranteed to this kind of device, has solved current vibration energy recovery structure and has only been to defects such as single frequency sensitivity.
The technical scheme of the utility model is explained as follows with the attached drawings: a multi-frequency vibrational energy recovery apparatus, the recovery apparatus comprising a magnetoelectric conversion portion and an energy harvesting portion; the magneto-electric conversion part comprises a shell 1, an extension spring 2, a mass block 3 and an inductance coil 4; the energy harvesting section comprises an electrical energy storage circuit 5; the shell 1 is a rectangular hollow shell, and a plurality of cavities are uniformly arranged in the shell; wherein each cavity is internally provided with an extension spring 2; the extension spring 2 is arranged in the shell 1, one end of the extension spring is fixed at the upper part of the inner side of the shell 1, and the other end of the extension spring is connected with the mass block 3; the inductance coil 4 is arranged in the cavity of the shell 1 and outside the mass block 3; the mass block 3 is internally provided with a permanent magnet 6, and the mass block 3 and the permanent magnet 6 vibrate in the inductance coil 4.
The inductance coil 4 comprises an inductance coil framework 9, an inductance coil magnetic core 7 and an enameled wire 8; the inductance coil framework 9 is fixed in the cavity, and a through hole is formed in the middle of the inductance coil framework; the inductance coil magnetic core 7 is arranged in the inductance coil framework 9 and is in interference fit with the through hole; the enameled wire 8 is wound on the inductance coil framework 9.
The utility model has the advantages that:
1. the multi-frequency vibration energy recovery device of the utility model adopts the mode of changing the parameters of the system extension spring and changing the mass block quality to control the natural frequency of the system, thereby leading the device to achieve resonance under different typical vibration frequencies of the environment, and solving the problem of single working frequency of the prior device;
2. the multi-frequency vibration energy recovery device can be simplified into a spring-mass block-damping vibration model with single degree of freedom, the device has simple structure and simple and convenient analysis method, and complex faults are not easy to occur during use;
3. a multifrequency vibration energy recovery unit mainly include magnetoelectric conversion and electric energy collection two parts, store the vibration energy of magnetoelectric conversion part collection in the battery to this solves the problem that traditional vibration energy collection device can not make micro-electromechanical system work when the generated energy is less.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a front view of FIG. 1;
FIG. 3 is a schematic diagram of the present invention;
fig. 4 is a cross-sectional view of a mass block in the present invention;
fig. 5 is a schematic diagram of an inductance coil structure according to the present invention;
fig. 6 is a schematic diagram of the tank circuit according to the present invention.
In the figure: 1. a housing; 2. an extension spring; 3. a mass block; 4. an inductor coil; 5. an electrical energy storage circuit; 6. a permanent magnet; 7. an inductor core; 8. enamelled wires; 9. inductance coil skeleton.
Detailed Description
Referring to fig. 1-2, a multi-frequency vibrational energy recovery apparatus includes a magnetoelectric conversion portion and an energy harvesting portion; the magneto-electric conversion part comprises a shell 1, an extension spring 2, a mass block 3 and an inductance coil 4; the energy harvesting section comprises an electrical energy storage circuit 5; a plurality of cavities are uniformly arranged in the shell 1; wherein each cavity is internally provided with an extension spring 2; the extension spring 2 is arranged in the shell 1, one end of the extension spring is fixed at the upper part of the inner side of the shell 1, and the other end of the extension spring is connected with the mass block 3; the inductance coil 4 is arranged outside the mass block 3; the mass block 3 is internally provided with a permanent magnet 6, and the mass block 3 and the permanent magnet 6 vibrate in the inductance coil 4.
The inductance coil 4 comprises an inductance coil framework 9, an inductance coil magnetic core 7 and an enameled wire 8; the inductance coil framework 9 is fixed in the cavity, and a through hole is formed in the middle of the inductance coil framework; the inductance coil magnetic core 7 is arranged in the inductance coil framework 9 and is in interference fit with the through hole; the enameled wire 8 is wound on the inductance coil framework 9.
The outer shell 1 is of a hollow three-dimensional structure, the size of the outer shell 1 is determined according to the number of turns of the inductance coil framework 9, the inductance coil magnetic core 7 and the enameled wire 8 in the inductance coil 4, and in the embodiment, the final design overall size is 248mm × 60mm × 60 mm. The mass 3 is located in each cavity of the housing 1 and is connected to the housing 1 by the tension spring 2. The number of tension springs 2 and masses 3 is equal to the number of housing cavities. The number of cavities in the housing is determined according to the number of typical vibration frequencies of the environment in which the device is placed, and in this example, the housing is designed to have a hollow three-dimensional structure with four cavities.
A multifrequency vibration energy recovery unit can simplify the spring-quality piece-damping system vibration model of single degree of freedom, the forced vibration that arouses by external basic motion promptly, is converted the kinetic energy of quality piece 3 into the electric energy through electromagnetic induction. When the mass block 3 vibrates under external excitation, the permanent magnet 6, which is equivalent to being arranged inside the mass block 3, reciprocates at a certain frequency along with the vibration of the environment, namely, moves relative to the inductance coil 4. According to faraday's law of electromagnetic induction: when the magnetic flux passing through the area enclosed by the closed loop (typically a coil) changes, an induced electromotive force is generated in the loop. The induced electromotive force can be expressed as:
wherein U iseRepresenting the induced electromotive force with the unit of V; n is a radical ofeIndicating the number of coil turns constituting a closed loop;is the magnetic flux through each turn of the coil, in Wb; b is magnetic induction, with the unit of T;is the area vector of the coil; t is time in units of s.
Referring to fig. 3, the response of the magnet to external vibration can be represented by a spring-mass-damper system, in which a permanent magnet 6 is placed in a mass 3, where the mass is m and B is magneticThe induction intensity, k is the stiffness coefficient of the spring, L is the coil inductance, the coil internal resistance is Rc, the coil length is L, and the load resistance is RL. The vibration displacement y (t) and the vibration frequency of the shell 1 along with the external environment will cause the vibration displacement x (t) of the mass block 3, thereby influencing the output voltage and power of the system. Let f (t) be the vibration displacement of the spring-mass-damping system. The differential equation of the forced vibration of the system under any excitation can be known from Newton's law as follows:
where x (t) ═ a cos (ω t + θ) is a vibration displacement function of the mass 3 (i.e., the permanent magnet 6), and c is a damping coefficient of the system.
When the initial condition is zero, performing laplace transform on the initial condition to obtain a transfer function as follows:
according to the voltage principle, the following results are obtained:
where I (t) is a function of the change in induced current over time.
The induced voltage of the vibration device obtained from (5) is:
thus, the transfer function from the relative movement of the permanent magnet 5 to the output voltage can be expressed as:
the feedback generated by the induced current in the solenoid coil 4 is:
combining the equations (3), (4), (6) and (7), the transfer function of the system can be obtained as follows:
after the Laplace transform, the transfer function of the oscillation link can be obtained as follows:
in the formula,when zeta is more than or equal to 0 and less than or equal to 1, the oscillation link is formed.
The damping coefficient ζ can be decomposed into a mechanical damping coefficient ζmAnd electrical damping coefficient ζsWherein:
thus, the overall transfer function of the system becomes:
i.e. the output voltage can be seen as a function of a sinusoidal input signal. Because the output power is:
the average power obtained was:
it can be derived that at the resonance frequency, ω ═ ωnThe average power and the output voltage value of the output reach the maximum:
the motion equation of the system can be described by the mathematical model, and the maximum output power of the system can be optimally designed by analyzing the given external vibration mode.
From the above analysis, the design of the device should ensure that the natural frequency of the device is close to the typical vibration frequency of the environment, so that the device and the environment can resonate, and the energy recovery efficiency is the highest. In the energy recovery device of the present invention, it is necessary to ensure that the natural frequency of each spring-mass block unit is close to a typical vibration frequency of the environment, so as to ensure that at least one unit resonates with the environment under each typical vibration condition of the external environment. Typical frequencies of the environment can be simply measured experimentally. The natural frequency of the spring can be calculated by the following equation:
wherein f is the natural frequency of the spring and the unit is Hz; k is the stiffness coefficient of the spring, and the unit is N/m; m is the system mass in kg.
The stiffness coefficient k of the extension spring can be obtained by the following formula:
wherein G is the modulus of stiffness of the wire, and common wires include carbon steel wire G-79300, stainless steel wire G-697300, phosphor bronze wire G-4500, brass wire G-350; d is the wire diameter DmIs the spring pitch diameter, NCThe effective number of turns of the spring.
The proper spring or the spring which is reasonably designed and meets the requirement of the placement environment of the device can be selected according to the vibration frequency of the external environment.
Referring to fig. 3, the mass block 3 is a cubic structure made of soft magnetic material, and a permanent magnet 6 in a cylindrical or rectangular parallelepiped shape is placed inside the structure. The soft magnetic material refers to a magnetized material with the magnetization occurring at the coercive force not more than 1000A/m, and the main performance parameters of the soft magnetic material comprise magnetic permeability, saturated magnetic induction intensity and coercive force. The magnetic permeability determines the ability of the material to transmit magnetic lines of force and is one of the more important parameters. The mass block 3 in the device not only vibrates under external excitation, but also plays a role of conducting magnetic lines, so that the material with the characteristics of low coercive force and high magnetic permeability is selected, and the soft magnetic material has the two characteristics, such as pure iron (the density is 7.86g/cm 3).
The utility model discloses magnetic field among the device is produced by permanent magnet 6, and the main parameter of permanent magnet characteristic has magnetic energy product, coercive force, three items of surplus magnetic induction intensity. Wherein, the magnetic energy product represents the magnetic energy density established by the permanent magnet in the air gap space, namely the magnetostatic energy of the air gap unit volume. The larger the magnetic energy product is, the larger the magnetic energy stored in a unit volume is, and the better the material performance is; the coercive force is the reverse magnetic field intensity required to be added for reducing the magnetic induction intensity of the permanent magnet magnetized to the technical saturation to zero, and the larger the coercive force is, the better the permanent magnetism is; the residual magnetic induction intensity refers to the magnetic induction intensity retained after the permanent magnet is magnetized until the technology is saturated and the external magnetic field is removed. The larger the parameter value is, the better the performance of the permanent magnetic material is. The permanent magnet comprises magnetic steel, ferrite and a rare earth permanent magnet. The magnetic steel has the advantages of no temperature influence, high temperature environment application, high corrosion resistance, long service life and maximum magnetic energy product second to that of the rare earth permanent magnet. Ferrite is inferior to other two types of permanent magnets in performance, but is also widely used due to its low cost. Compared with other two permanent magnet materials, the rare earth permanent magnet material is a magnetic material with high magnetic energy product, high coercive force and high residual magnetic induction intensity, wherein the maximum magnetic energy product of the neodymium iron boron series permanent magnet can reach 398KJ/m3, the residual magnetic induction intensity can reach 1.47T, and the rare earth permanent magnet material is the permanent magnet material with the highest magnetism at present. Under the same volume, the magnetic field intensity of the rare earth permanent magnet is the maximum, so the rare earth permanent magnet is often the first choice of a vibration energy device, and simultaneously, because the coercive force ratio of the rare earth permanent magnet is higher, the rare earth permanent magnet cannot be demagnetized due to the vibration of the device, so the rare earth permanent magnet is selected as the material of the permanent magnet 6, NdFe35 is determined as the permanent magnet material, and the material density is 7.5g/cm 3. The mass block is designed into a cube with the side length of 10mm, the permanent magnet material is a cylinder with the radius of 4mm and the length of 10mm, and the permanent magnet material is arranged inside the mass block as shown in figure 3.
Referring to fig. 3, the mass 3 and the permanent magnet 6 inside the mass vibrate inside the inductor 4, so that the inductor 4 is an air-core coil structure.
Referring to fig. 5, in the inductor structure, the magnetic core 7 and the bobbin 9 are both hollow, and the outer diameter of the magnetic core 7 is matched with the diameter of the hollow part of the bobbin 9, so as to place the magnetic core 7 in the bobbin 9. The enameled wire 8 is wound on the framework 9 as a winding.
Firstly, selecting a lead of a coil according to the working frequency: an inductance coil working at a low frequency band is generally wound by insulated wires such as enameled wires. In the circuit with the working frequency higher than tens of kilohertz and lower than 2MHz, a plurality of strands of insulated wires are adopted to wind the coil, so that the surface area of the conductor can be effectively increased, and the influence of skin effect can be overcome. In a circuit with frequency higher than 2MHz, the inductance coil is wound by a single thick wire, and the diameter of the wire is generally 0.3 mm-1.5 mm. Therefore, the utility model discloses the device chooses for use the enameled wire as coil wire material. In various conductors, the conductivity of copper is second to that of silver, the resistivity of soft copper is lowest among various copper materials, the direct current resistivity at 20 ℃ is 0.017241 omega mm2/m, and the dielectric constant is equal to0＝8.85×10-12F/m, conductivity gamma 5.80 × 107S/m, the larger the wire diameter of the enameled wire is, the shorter the length is, and the smaller the direct current resistance is.
The high-quality framework is selected to reduce the dielectric loss, for example, a high-frequency porcelain material is selected as the framework. The magnetic core is placed in the coil, so that the number of turns of the coil can be reduced, namely the resistance value of the coil is reduced, the inductance value of the coil can be improved, and the volume of the coil is reduced. The magnetic core material can be high magnetic conductive annular magnetic core MnZn, and the higher the initial magnetic conductivity is, the higher the working frequency is. The adhesive tape in the structure is used for insulating each layer of winding and fixing the magnetic core and the conducting wire. The size of the framework is such that the extension spring 2 can drive the mass block 3 to move unhindered in the magnetic core. After the size of the mass block 3 is determined in the device, a framework with the diameter of the circle of the two side wallboards being 50mm, the hollow diameter being 20mm and the height being 25mm can be selected. From this size, the housing 1 can be further dimensioned. The inductance coil 4 is placed in the cavity of the shell 1, namely, the width part of the cavity is slightly larger than the wall plate diameter of the coil skeleton by 50mm, the length part of the cavity is larger than the height of the coil skeleton and a gap for adjusting the position of the inductance coil 4 is reserved, if the width of each cavity is 52mm, the length is 50mm, and the thickness of the shell is 5mm, the whole size of the shell 1 is 248mm multiplied by 60 mm.
The inductor coil 4 needs to have two windings, a primary winding and a secondary winding. The electric energy output by the primary coil is stored through the inductor in the subsequent circuit, and the electric energy output by the secondary coil provides energy for the circuit chip. The design of the number of turns of the coil needs to consider the magnitude of voltage required by a chip in the rear circuit. The magnitude of the coil inductance depends mainly on the number of coil turns, the geometry, and the coil structure dimensions, such as winding length, diameter, thickness, etc.
As can be seen from the expressions (14), (15) and (16), the internal resistance of the coil directly affects the magnitude of the output voltage and the power, so the internal resistance should be minimized during design. According to a resistance calculation formula:
R＝ρl/S (19)
wherein rho is the resistivity of the material and has the unit of omega m; lRIs the resistance length in m; s is the resistance cross-sectional area in m2。
The length and cross-sectional area of the winding coil are:
the resistance of the winding coil is then:
wherein d is0Is the outer diameter of the spiral coil, in m; d1Is the inner diameter of the spiral coil, in m; w0Is the length of the cross-sectional area of the coil, and is expressed in m; w is a1The thickness of the cross-sectional area of the coil is m; μ is the duty cycle.
Number of coil turns:
the inductance engineering of the spiral coil is approximately calculated as:
wherein,changing the outer diameter d of the coil0And the number of turns N of the coil, and the relationship between the outer diameter of the coil and the number of turns of the coil and the inductance can be calculated.
The electric energy generated by the magnetoelectric conversion part is relatively small, and the driving energy cannot be directly provided for most circuits, so that the electric quantity needs to be stored. The method for collecting the electromagnetic vibration to generate electricity mainly comprises two methods of collecting the generated vibration energy through a capacitor/inductor and utilizing a rechargeable battery. The whole structure in the device is not powered by external energy, and the circuit is driven to normally work only by electric quantity generated by the magnetoelectric conversion part.
Referring to fig. 6, a switch S in the energy storage circuit is used for an input terminal power switch, Ls is a superconducting energy storage coil, a diode D performs a freewheeling function, S2 is an inductor discharge control switch, S3 is turned on during charging and discharging, an inductor Lf and a capacitor Cf are filter inductors, and Rl is a system load. Switch S1 has two functions: the energy storage and charging circuit is used for forming a current path and shunting during discharging so as to realize constant current or constant voltage control. In operation, the circuit has three operating states: a state of charge; an energy storage state; a discharge state. During charging, the switch S is turned on, S1 is closed, S2 is opened, and S3 is opened. When energy is stored, S is disconnected from the power supply, S1 is still connected, S2 is disconnected, and S3 is closed.
In the above-mentioned example, the utility model discloses the quality piece size, the inductance coils skeleton size of device are variable parameter in practical application. From the above description, it can be seen that the overall size of the device in this example is only 248mm × 60mm × 60mm, and the miniaturization requirement of the structure is satisfied. Due to size limitations, the present device is only suitable for recovering low frequency vibrations of 10-200Hz in an environment. The device can be applied to the recovery of low-frequency vibration energy in various large-scale mechanical bases or vibrating elements, automobile engines, blenders, washing machines and various microstructures, and provides electric energy for micro-electromechanical systems or wireless sensors.
Claims (2)
1. A multi-frequency vibrational energy recovery apparatus, characterized in that the recovery apparatus comprises a magnetoelectric conversion portion and an energy harvesting portion; the magneto-electric conversion part comprises a shell (1), a tension spring (2), a mass block (3) and an inductance coil (4); the energy harvesting portion comprises an electrical energy storage circuit (5); the shell (1) is a rectangular hollow shell, and a plurality of cavities are uniformly arranged in the shell; wherein each cavity is internally provided with an extension spring (2); the extension spring (2) is arranged in the shell (1), one end of the extension spring is fixed at the upper part of the inner side of the shell (1), and the other end of the extension spring is connected with the mass block (3); the inductance coil (4) is arranged in the cavity of the shell (1) and outside the mass block (3); the mass block (3) is internally provided with a permanent magnet (6), and the mass block (3) and the permanent magnet (6) vibrate in the inductance coil (4).
2. The multi-frequency vibration energy recovery device of claim 1 wherein the inductor (4) comprises an inductor former (9), an inductor core (7) and enameled wire (8); the inductance coil framework (9) is fixed in the cavity, and a through hole is formed in the middle of the inductance coil framework; the inductance coil magnetic core (7) is arranged in the inductance coil framework (9) and is in interference fit with the through hole; the enameled wire (8) is wound on the inductance coil framework (9).
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| CN201621094501.1U CN206041775U (en) | 2016-09-30 | 2016-09-30 | Multi -frequency vibration energy recovery unit |
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| CN201621094501.1U CN206041775U (en) | 2016-09-30 | 2016-09-30 | Multi -frequency vibration energy recovery unit |
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| CN201621094501.1U Expired - Fee Related CN206041775U (en) | 2016-09-30 | 2016-09-30 | Multi -frequency vibration energy recovery unit |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106329873A (en) * | 2016-09-30 | 2017-01-11 | 吉林大学 | Multi-frequency vibration energy recycling device |
| CN107453579A (en) * | 2017-07-24 | 2017-12-08 | 北京生泰消防装备有限公司 | A kind of Nd-Fe-B permanent magnetic TRT |
| CN108039810A (en) * | 2017-12-01 | 2018-05-15 | 华南理工大学 | A kind of washing machine electromagnetic vibration power generation device |
| CN109412374A (en) * | 2018-12-05 | 2019-03-01 | 中南大学 | SPA bridge multifrequency electromagnetic energy acquisition-damper |
| CN110912370A (en) * | 2019-11-13 | 2020-03-24 | 华南理工大学 | Energy conversion device for inhibiting hydro-elastic vibration of hull beam and design method thereof |
| CN111711255A (en) * | 2020-07-20 | 2020-09-25 | 上海英内物联网科技股份有限公司 | Method for reducing energy consumption of semi-active RFID equipment |
-
2016
- 2016-09-30 CN CN201621094501.1U patent/CN206041775U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106329873A (en) * | 2016-09-30 | 2017-01-11 | 吉林大学 | Multi-frequency vibration energy recycling device |
| CN107453579A (en) * | 2017-07-24 | 2017-12-08 | 北京生泰消防装备有限公司 | A kind of Nd-Fe-B permanent magnetic TRT |
| CN108039810A (en) * | 2017-12-01 | 2018-05-15 | 华南理工大学 | A kind of washing machine electromagnetic vibration power generation device |
| CN109412374A (en) * | 2018-12-05 | 2019-03-01 | 中南大学 | SPA bridge multifrequency electromagnetic energy acquisition-damper |
| CN110912370A (en) * | 2019-11-13 | 2020-03-24 | 华南理工大学 | Energy conversion device for inhibiting hydro-elastic vibration of hull beam and design method thereof |
| CN111711255A (en) * | 2020-07-20 | 2020-09-25 | 上海英内物联网科技股份有限公司 | Method for reducing energy consumption of semi-active RFID equipment |
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