CN113241970A - Multistable speed amplification and frequency boost combined vibration energy collector and collecting method thereof - Google Patents
Multistable speed amplification and frequency boost combined vibration energy collector and collecting method thereof Download PDFInfo
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- H02N2/18—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators
- H02N2/186—Vibration harvesters
- H02N2/188—Vibration harvesters adapted for resonant operation
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- H—ELECTRICITY
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- H02N1/04—Friction generators
Abstract
The invention provides a multistable speed amplification and frequency boosting combined type vibration energy collector and a collecting method thereof, wherein the multistable speed amplification and frequency boosting combined type vibration energy collector comprises a shell, a movable induction coil group, a fixed induction coil group, a movable permanent magnet array, a fixed permanent magnet array, a first high-frequency piezoelectric cantilever beam, a second high-frequency piezoelectric cantilever beam, a dielectric film, a planar tooth comb electrode and a transmission mechanism; the first high-frequency piezoelectric cantilever beam and the second high-frequency piezoelectric cantilever beam are respectively arranged at two end parts inside the shell. The collector can improve the relative speed of an energy conversion unit in the electromagnetic induction and friction nanometer generator and increase the energy transfer frequency of the low-frequency oscillator and the high-frequency piezoelectric transducer in each period through the action of motion amplification and direction change of mechanical transmission. Meanwhile, the number of linear spring structures required for generating seven-steady-state characteristics is reduced and the utilization rate of the magnetic field is improved due to the design of the magnetic field of the collector, so that the difficulty of production and assembly is reduced, and the collector can be further miniaturized and integrated.
Description
Technical Field
The invention belongs to the technical field of vibration energy collection, and particularly relates to a multistable speed amplification and frequency boost combined type vibration energy collector and a collection method thereof.
Background
At present, most of known broadband multistable up-conversion composite vibration energy collectors utilize vibration in a low-frequency oscillator coupling environment, then transmit the kinetic energy part of the low-frequency oscillator to a transducer structure with high natural frequency through collision or magnetic force, and further generate electric energy through electromechanical coupling. In a single period, the energy transfer between the low-frequency oscillator and the high-frequency transducer is only one to two times, and the energy transfer efficiency is low. The multistable characteristic of the collector mainly depends on the action of an external magnetic field. When the number of stable states reaches five or more, complex external magnetic fields and more than two linear spring structures are required to be matched with each other to achieve the effect. The electromagnetic induction and friction nano generator mainly relies on the relative motion of the stator and the rotor to collect energy, is limited by the relative motion speed, and has poor energy collection effect. Therefore, it is necessary to realize a multistable motion amplification and frequency boosting composite vibration energy collector which has a miniaturization design potential, seven stable motions and can greatly improve the working efficiency of each energy collecting unit. However, no such device has been known to achieve the above-described object and function.
Disclosure of Invention
In order to solve the defects in the prior art, further improve the output power of the broadband multistable frequency-boosting composite vibration energy collector, improve the defects that the magnetic field is complex in arrangement, low in utilization rate and incapable of being further miniaturized, the invention provides the multistable speed-amplifying frequency-boosting composite vibration energy collector, and the collector can improve the relative speed of an energy conversion unit in an electromagnetic induction and friction nanogenerator and increase the energy transfer frequency of a low-frequency oscillator and a high-frequency piezoelectric transducer in each period through the action of motion amplification and direction change of mechanical transmission. Meanwhile, the number of linear spring structures required for generating seven-steady-state characteristics is reduced and the utilization rate of the magnetic field is improved due to the design of the magnetic field of the collector, so that the difficulty of production and assembly is reduced, and the collector can be further miniaturized and integrated.
The multistable speed amplification and frequency boosting combined vibration energy collector comprises a shell, a movable induction coil group, a fixed induction coil group, a movable permanent magnet array, a fixed permanent magnet array, a first high-frequency piezoelectric cantilever beam, a second high-frequency piezoelectric cantilever beam, a dielectric film, a planar tooth comb electrode and a transmission mechanism, wherein the movable induction coil group is arranged on the shell;
the first high-frequency piezoelectric cantilever beam and the second high-frequency piezoelectric cantilever beam are respectively arranged at two end parts in the shell;
the fixed induction coil group comprises four induction coils, every two induction coils are mutually arranged at the upper end and the lower end of the middle position of the shell in a group respectively, and a fixed permanent magnet is respectively fixed between the two induction coils at the upper end and between the two induction coils at the lower end;
the inner sides of two induction coils at the upper end and the inner sides of two induction coils at the lower end are respectively provided with a row of movable permanent magnet arrays, one surfaces of the two induction coils and one fixed permanent magnet array facing the movable permanent magnet arrays are arranged into a plane, each row of movable permanent magnet arrays comprises a plurality of groups of movable permanent magnet groups, each group of movable permanent magnet groups comprises three permanent magnets, the three permanent magnets are respectively fixed on a metal frame, the magnetic pole directions between the two adjacent permanent magnets are opposite, a cavity in the middle of the two rows of movable permanent magnet arrays is provided with the movable induction coil groups, the magnetic pole directions of the permanent magnets of the two rows of movable permanent magnet arrays are the same, each movable induction coil group comprises a plurality of groups of movable induction coil groups, each induction coil group is formed by connecting three induction coils in series, and the number of the movable permanent magnet groups corresponds to the number of the movable induction coil groups, the hollow areas in the middle of the induction coils of the fixed induction coil group and the movable coil group are filled with iron cores and shape supports;
the planar comb electrodes are arranged on the upper surface and the lower surface of the movable induction coil group and the surface formed by the fixed induction coil group and the fixed permanent magnet group, tetrafluoroethylene films are attached to the planar comb electrodes, nylon electrodes are attached to the upper surface and the lower surface of the movable permanent magnet array, when the movable permanent magnet array, the movable induction coil group and the fixed induction coil group move relatively, electromagnetic induction voltage appears in the induction coils, the planar comb electrodes, the tetrafluoroethylene films and the nylon electrodes form a friction nano-generator, static induction voltage is generated, and the planar comb electrodes, the tetrafluoroethylene films and the nylon electrodes serve as a low-friction guide mechanism to restrain the movement directions of the movable induction coil group and the movable permanent magnet array;
the transmission mechanism comprises a coaxial transmission gear, a first rack and a second rack which are coaxially arranged, the first rack is used as a permanent magnet array fixing frame at the same time, the movable induction coil group and the movable permanent magnet array can move in opposite directions under the combined action of the transmission mechanism, the relative speed between the movable induction coil group and the movable permanent magnet array is increased, when the shell bears the vibration in the external horizontal direction, the mass M1 of the movable permanent magnet array is far larger than the mass M2 of the movable induction coil group, and the equivalent inertial mass of the system is M1-M2.
Preferably, the distance between the movable permanent magnet array and the high-frequency piezoelectric cantilever is smaller than the distance between the movable induction coil group and the high-frequency piezoelectric cantilever.
Preferably, the first high-frequency piezoelectric cantilever beam and the second high-frequency piezoelectric cantilever beam are identical in structure and are both folded structures, and the initial stiffness of the two folded high-frequency piezoelectric cantilever beams is identical.
Preferably, the permanent magnet array is a rubidium iron boron permanent magnet array.
Preferably, the planar comb electrode is made of a copper foil tape.
Preferably, the movable permanent magnet group and the movable induction coil group are both provided as one group.
Preferably, the fixed induction coil group and the fixed permanent magnet array are fixed in a sticking manner.
Preferably, the gear ratio of the coaxial transmission gear is set as required.
Preferably, the filled core and shape support are FeSiCr and silicone rubber compound.
Preferably, the present invention also provides a method of vibrational energy harvesting comprising the steps of:
s1, when the movable permanent magnet array moves rightwards, the movable permanent magnet array is firstly contacted with the second high-frequency piezoelectric cantilever beam to generate extrusion deformation and generate voltage output;
s2, the movable induction coil group moves leftwards to be in contact with the first high-frequency piezoelectric cantilever beam, so that extrusion deformation is generated and voltage output is generated;
s3, the rigidity of the system is changed by the two contacts of the movable permanent magnet array and the movable induction coil to the first high-frequency piezoelectric cantilever beam and the second high-frequency piezoelectric cantilever beam, the equivalent linear rigidity of the system is increased from 0 to k1 and then to k1+ k2, wherein k1 is the equivalent rigidity of the second high-frequency piezoelectric cantilever beam to the equivalent inertial mass of the system, k2 is the equivalent rigidity of the first high-frequency piezoelectric cantilever beam to the equivalent inertial mass of the system, and k2 is greater than k 1;
s4, repulsion force exists among the movable permanent magnet array and the fixed permanent magnet group, the collector structure can generate seven stable balance positions at most through the combined action of magnetoelasticity and system equivalent linear rigidity, and the inertial mass jumps among wells among the stable balance positions.
Compared with the prior art, the invention has the following beneficial effects:
(1) the relative speed between the movable induction coil group and the movable permanent magnet array is increased, so that the efficiency of the electromagnetic induction and friction nano generator is improved.
(2) The reverse motion between the movable induction coil group and the movable permanent magnet array increases the deformation times of the high-frequency piezoelectric cantilever beam in each collector working period, and improves the working efficiency of the piezoelectric transducer.
(3) The equivalent stiffness of the high-frequency piezoelectric cantilever beam can be changed by adjusting the transmission ratio, so that the seven-stable-state motion of the collector system is simply realized, the low-frequency working efficiency of the collector is increased, the resonance bandwidth is improved, and the resonance can be carried out between 0.5HZ and 10HZ, so that more electric energy can be absorbed, and the working efficiency of the whole device is improved.
Drawings
FIG. 1 is a schematic diagram of a transducing structure of the present invention;
FIG. 2 is a schematic diagram of the gearing structure between the movable induction coil assembly and the movable permanent magnet array;
fig. 3 is a diagram showing the stress and potential energy states of the main inertial mass in the embodiment.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Specifically, the invention provides a multistable speed amplification and frequency boosting combined vibration energy collector which comprises a shell 1, a movable induction coil group 3, a fixed induction coil group 6, a movable permanent magnet array 4, a fixed permanent magnet array 5, a first high-frequency piezoelectric cantilever beam 21, a second high-frequency piezoelectric cantilever beam 22, a dielectric film, a planar comb electrode and a transmission mechanism.
The first high-frequency piezoelectric cantilever 21 and the second high-frequency piezoelectric cantilever 22 are respectively disposed at both end portions inside the housing 1.
The fixed induction coil group 6 comprises four induction coils, every two induction coils are mutually arranged in a group and are arranged at the upper end and the lower end of the middle position of the shell 1, and a fixed permanent magnet array 5 is respectively fixed between the two induction coils at the upper end and between the two induction coils at the lower end.
Two induction coil inboards of upper end and two induction coil inboards of lower extreme are provided with one row of movable permanent magnet array 4 respectively, two induction coils and a fixed permanent magnet array arrange into the plane towards the one side of movable permanent magnet array, each row of movable permanent magnet array 4 includes multiunit movable permanent magnet group, each group of movable permanent magnet group includes three permanent magnet, set up to one in this embodiment, each group sets up three permanent magnet, three permanent magnet is fixed respectively on metal crate, the magnetic pole opposite direction between two adjacent permanent magnets. The adjacent surfaces of the adjacent fixed permanent magnets and the movable permanent magnets have the same magnetic poles. A movable induction coil group is arranged in a cavity in the middle of two rows of movable permanent magnet arrays, the magnetic pole directions of the permanent magnets opposite to the two rows of movable permanent magnet arrays 4 are opposite, the movable induction coil group comprises a plurality of groups of movable induction coil groups, each induction coil group is formed by connecting three induction coils in series, the number of the movable permanent magnet groups corresponds to that of the movable induction coil groups, and iron cores and shape supports are filled in hollow areas in the middle of the induction coils of the fixed induction coil group and the movable induction coil groups.
The planar comb teeth electrodes 8 are arranged on the upper surface and the lower surface of the movable induction coil group and the surface formed by the fixed induction coil group and the fixed permanent magnet group, tetrafluoroethylene films are pasted on the planar comb teeth electrodes, nylon electrodes are pasted on the upper surface and the lower surface of the movable permanent magnet array, when the movable permanent magnet array, the movable induction coil group and the fixed induction coil group move relatively, electromagnetic induction voltage appears in the induction coils, the planar comb teeth electrodes, the tetrafluoroethylene films and the nylon electrodes form a friction nano generator, static induction voltage is generated, and the planar comb teeth electrodes, the tetrafluoroethylene films and the nylon electrodes serve as a low-friction guide mechanism to restrain the movement directions of the movable induction coil group and the movable permanent magnet array.
The transmission mechanism comprises a coaxial transmission gear 10, a first rack 111 and a second rack 112 which are coaxially arranged, the first rack 111 is used as a permanent magnet array fixing frame at the same time, the common action of the transmission mechanism can enable the movable induction coil group and the movable permanent magnet array to move in opposite directions and increase the relative speed between the movable induction coil group and the movable permanent magnet array, when the shell 1 bears vibration in the external horizontal direction, the mass M1 of the movable permanent magnet array is far larger than the mass M2 of the movable induction coil group, and the equivalent inertia mass of the system is M1-M2.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
Referring to the attached drawings, the multistable motion amplification and frequency boosting combined vibration energy harvester comprises a shell 1, a first high-frequency piezoelectric cantilever beam 21, a second high-frequency piezoelectric cantilever beam 22, a movable induction coil group 3, a movable permanent magnet array 4, a fixed permanent magnet array 5, a fixed induction coil group 6, a tetrafluoroethylene film 7, a planar tooth comb electrode 8, a nylon electrode 9, a coaxial transmission gear 10, a rack and permanent magnet array fixing frame 111 and a rack 112.
The movable permanent magnet array 4 is formed by dividing six rubidium iron boron permanent magnets into an upper row and a lower row and arranging the six rubidium iron boron permanent magnets according to the polarities shown in the attached drawing. The upper row of magnets and the lower row of magnets are adhered to the outer metal frame to prevent mutual attraction. The movable induction coil group 3 is positioned in the middle cavity of the movable permanent magnet array 4 and is formed by connecting three self-adhesive coils in series, and in other embodiments, the number of the self-adhesive coils can be set to be a multiple of 3. The hollow area in the middle of the coil is filled with FeSiCr and silicon rubber mixture as an iron core and a shape support. The fixed permanent magnet array 5 and the fixed induction coil group 6 are bonded together and arranged in a plane on the side facing the movable permanent magnet array 4, and the hollow area of the coil is also filled with the iron core. The planar comb electrodes 8 made of copper foil tapes are adhered to the upper and lower surfaces of the movable induction coil group 3 and the surface formed by the fixed induction coil group 6 and the fixed permanent magnet array 5. Then, a tetrafluoroethylene film 7 is attached to the planar comb electrode 8. Nylon electrodes 9 are adhered to the upper and lower surfaces of the movable permanent magnet array 4. When the movable permanent magnet array 4 and the movable induction coil group 3 and the fixed induction coil group 6 move relatively, electromagnetic induction voltage appears in the induction coils. The planar comb electrode 8, the attached tetrafluoroethylene film 7 and the nylon electrode 9 form a friction nano generator to generate static induction voltage, and the static induction voltage is used as a low-friction guide mechanism to restrain the movement directions of the movable induction coil group 3 and the movable permanent magnet array 4. A first high-frequency piezoelectric cantilever beam 21 and a second high-frequency piezoelectric cantilever beam 22 are fixed on two sides of the shell 1. By utilizing the interaction between the coaxial transmission gear 10 and the rack and permanent magnet array fixing frame 111 and the rack 112, the movable induction coil group 3 and the movable permanent magnet array 4 can move in opposite directions, and the relative speed of the two is amplified. When the housing 1 is subjected to vibration in the external horizontal direction, since the mass (M1) of the movable permanent magnet array 4 is much larger than the mass (M2) of the movable induction coil assembly 3, the movable permanent magnet array 4 acts as a main inertial mass to absorb the external vibration energy and move (for example, to the right), and the movable induction coil assembly 3 is excited to move in the opposite direction (to the left) through the transmission gear. At this time, the equivalent inertial mass of the system is M1-M2. Because the distance between the movable permanent magnet array 4 and the folding type high-frequency piezoelectric cantilever beam is obviously smaller than the distance between the movable induction coil group 3 and the folding type high-frequency piezoelectric cantilever beam, when moving rightwards, the movable permanent magnet array 4 is firstly contacted with the second high-frequency piezoelectric cantilever beam 22, so that the second high-frequency piezoelectric cantilever beam generates extrusion deformation and generates voltage output. Subsequently, the movable induction coil assembly 3 is contacted with the first high-frequency piezoelectric cantilever beam 21, so that the first high-frequency piezoelectric cantilever beam generates compression deformation and generates voltage output. The two folding high-frequency piezoelectric cantilevers have the same rigidity, but due to the setting of the gear transmission ratio, the equivalent rigidity generated on the equivalent inertial mass of the system when the movable induction coil group 3 is in contact with the first high-frequency piezoelectric cantilever 21 is larger. The two front and back contacts of the movable part to the piezoelectric cantilever structure change the stiffness of the system, so that the equivalent linear stiffness of the system is partially increased from 0 to k1 (equivalent stiffness of the second high-frequency piezoelectric cantilever 22) to k1+ k2(k2 is the equivalent stiffness exhibited by the first high-frequency piezoelectric cantilever 21, and k2> k 1). Due to the effect of repulsion between the movable permanent magnet array 4 and the stationary permanent magnet array 5. As shown in the attached drawing, the collector structure can generate seven stable equilibrium positions (I, II, III, IV, V, VI and VII) at most through the combined action of magnetoelastic force and the equivalent linear rigidity of the system. The inertial mass makes inter-well jumps between stable equilibrium positions, which can increase the amplitude and resonance bandwidth.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the protection scope defined by the claims of the present invention.
Claims (10)
1. A multistable speed amplification and frequency boost combined vibration energy harvester is characterized in that: the device comprises a shell, a movable induction coil group, a fixed induction coil group, a movable permanent magnet array, a fixed permanent magnet array, a first high-frequency piezoelectric cantilever beam, a second high-frequency piezoelectric cantilever beam, a dielectric film, a planar comb electrode and a transmission mechanism;
the first high-frequency piezoelectric cantilever beam and the second high-frequency piezoelectric cantilever beam are respectively arranged at two end parts in the shell;
the fixed induction coil group comprises four induction coils, every two induction coils are mutually arranged at the upper end and the lower end of the middle position of the shell in a group respectively, and a fixed permanent magnet is respectively fixed between the two induction coils at the upper end and between the two induction coils at the lower end;
the inner sides of two induction coils at the upper end and the inner sides of two induction coils at the lower end are respectively provided with a row of movable permanent magnet arrays, one surfaces of the two induction coils and one fixed permanent magnet array facing the movable permanent magnet arrays are arranged into a plane, each row of movable permanent magnet arrays comprises a plurality of groups of movable permanent magnet groups, each group of movable permanent magnet groups comprises three permanent magnets, the three permanent magnets are respectively fixed on a metal frame, the magnetic pole directions between the two adjacent permanent magnets are opposite, a cavity in the middle of the two rows of movable permanent magnet arrays is provided with the movable induction coil groups, the magnetic pole directions of the permanent magnets of the two rows of movable permanent magnet arrays are the same, each movable induction coil group comprises a plurality of groups of movable induction coil groups, each induction coil group is formed by connecting three induction coils in series, and the number of the movable permanent magnet groups corresponds to the number of the movable induction coil groups, the hollow areas in the middle of the induction coils of the fixed induction coil group and the movable coil group are filled with iron cores and shape supports;
the planar comb electrodes are arranged on the upper surface and the lower surface of the movable induction coil group and the surface formed by the fixed induction coil group and the fixed permanent magnet group, tetrafluoroethylene films are attached to the planar comb electrodes, nylon electrodes are attached to the upper surface and the lower surface of the movable permanent magnet array, when the movable permanent magnet array, the movable induction coil group and the fixed induction coil group move relatively, electromagnetic induction voltage appears in the induction coils, the planar comb electrodes, the tetrafluoroethylene films and the nylon electrodes form a friction nano-generator, static induction voltage is generated, and the planar comb electrodes, the tetrafluoroethylene films and the nylon electrodes serve as a low-friction guide mechanism to restrain the movement directions of the movable induction coil group and the movable permanent magnet array;
the transmission mechanism comprises a coaxial transmission gear, a first rack and a second rack which are coaxially arranged, the first rack is used as a permanent magnet array fixing frame at the same time, the movable induction coil group and the movable permanent magnet array can move in opposite directions under the combined action of the transmission mechanism, the relative speed between the movable induction coil group and the movable permanent magnet array is increased, when the shell bears the vibration in the external horizontal direction, the mass M1 of the movable permanent magnet array is far larger than the mass M2 of the movable induction coil group, and the equivalent inertial mass of the system is M1-M2.
2. The multistable velocity amplifying and frequency boosting composite vibration energy harvester of claim 1 wherein: the distance between the movable permanent magnet array and the high-frequency piezoelectric cantilever beam is smaller than the distance between the movable induction coil group and the high-frequency piezoelectric cantilever beam.
3. The multistable velocity amplifying and frequency boosting composite vibration energy harvester of claim 2 wherein: the first high-frequency piezoelectric cantilever beam and the second high-frequency piezoelectric cantilever beam are identical in structure and are both of folding structures, and the initial rigidity of the two folding high-frequency piezoelectric cantilever beams is identical.
4. The multistable velocity amplifying and frequency boosting composite vibration energy harvester of claim 2 wherein: the permanent magnet array is a rubidium iron boron permanent magnet array.
5. The multistable velocity amplifying and frequency boosting composite vibration energy harvester of claim 1 wherein: the planar comb electrode is made of copper foil adhesive tape.
6. The multistable velocity amplifying and frequency boosting composite vibration energy harvester of claim 1 wherein: the movable permanent magnet group and the movable induction coil group are arranged into one group.
7. The multistable velocity amplifying and frequency boosting composite vibration energy harvester of claim 1 wherein: the fixed induction coil group and the fixed permanent magnet array are fixed in a pasting mode.
8. The multistable velocity amplifying and frequency boosting composite vibration energy harvester of claim 1 wherein: the gear ratio of the coaxial transmission gear is set as required.
9. The multistable velocity amplifying and frequency boosting composite vibration energy harvester of claim 1 wherein: the filled iron core and the shape support are FeSiCr and silicon rubber mixture.
10. A method of vibration energy harvesting of a multistable velocity amplifying and frequency boosting compound vibration energy harvester according to claim 1, wherein the method comprises the following steps: which comprises the following steps:
s1, when the movable permanent magnet array moves rightwards, the movable permanent magnet array is firstly contacted with the second high-frequency piezoelectric cantilever beam to generate extrusion deformation and generate voltage output;
s2, the movable induction coil group moves leftwards to be in contact with the first high-frequency piezoelectric cantilever beam, so that extrusion deformation is generated and voltage output is generated;
s3, the rigidity of the system is changed by the two contacts of the movable permanent magnet array and the movable induction coil to the first high-frequency piezoelectric cantilever beam and the second high-frequency piezoelectric cantilever beam, the equivalent linear rigidity of the system is increased from 0 to k1 and then to k1+ k2, wherein k1 is the equivalent rigidity of the second high-frequency piezoelectric cantilever beam to the equivalent inertial mass of the system, k2 is the equivalent rigidity of the first high-frequency piezoelectric cantilever beam to the equivalent inertial mass of the system, and k2 is greater than k 1;
s4, repulsion force exists among the movable permanent magnet array and the fixed permanent magnet group, the collector structure can generate seven stable balance positions at most through the combined action of magnetoelasticity and system equivalent linear rigidity, and the inertial mass jumps among wells among the stable balance positions.
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| US20080136562A1 (en) * | 2004-01-21 | 2008-06-12 | The Regents Of The University Of Michigan | Method and Micro Power Generator For Generating Electrical Power From Low Frequency Vibrational Energy |
| CN104806693A (en) * | 2015-04-30 | 2015-07-29 | 上海交通大学 | Intelligent self-adaptive vibration absorber, array integrating device and application of intelligent self-adaptive vibration absorber |
| US20170346376A1 (en) * | 2016-05-27 | 2017-11-30 | University Of Southern California | Energy harvester with self-assembled liquid bearing |
| CN106787593A (en) * | 2017-02-15 | 2017-05-31 | 南京航空航天大学 | A kind of electromagnetic type nonlinear resonance raising frequency vibrational energy harvester |
| CN106787945A (en) * | 2017-02-27 | 2017-05-31 | 重庆大学 | A kind of piezoelectricity friction electricity combined wide-band miniature energy collector |
| CN107863903A (en) * | 2017-12-12 | 2018-03-30 | 天津大学 | The non-linear wideband raising frequency vibration energy collector of array |
| CN210167944U (en) * | 2018-11-27 | 2020-03-20 | 北京交通大学 | Magnetic liquid plane composite multi-frequency vibration energy collector |
| CN110557045A (en) * | 2019-09-20 | 2019-12-10 | 长春工业大学 | Friction-piezoelectric-electromagnetic combined type energy harvester for low-speed rotary motion |
| CN110912457A (en) * | 2019-12-19 | 2020-03-24 | 浙江工商大学 | Composite three-stable-state piezoelectric vibration energy collector |
| CN112821708A (en) * | 2021-02-05 | 2021-05-18 | 南京领通汇智科技有限公司 | Bistable electromagnetic-piezoelectric hybrid vibration energy collector and self-powered sensing system |
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