CN108258876B - Closed magnetic circuit cantilever beam two-dimensional vibration energy collecting device - Google Patents
Closed magnetic circuit cantilever beam two-dimensional vibration energy collecting device Download PDFInfo
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- 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
- H02K35/04—Generators with reciprocating, oscillating or vibrating coil system, magnet, armature or other part of the magnetic circuit with moving coil systems and stationary magnets
Abstract
The two-dimensional vibration energy collecting device for the closed magnetic circuit cantilever beam comprises a cantilever beam fixed end and a cantilever beam, wherein one end of the cantilever beam is inserted into and fixedly arranged at the cantilever beam fixed end, the cross section of the cantilever beam is square, 4 groups of magnetic yoke brackets are fixedly arranged on the cantilever beam fixed end, each group of magnetic yoke brackets has 2, and one group of magnetic yoke brackets corresponds to one side surface of the cantilever beam; one side of the magnetic yoke bracket, which is far away from the fixed end, is provided with an inclined plane; a magnetic yoke is arranged between the two magnetic yoke brackets, the magnetic yoke is in a bilateral symmetry shape when seen from the installation position of the magnetic yoke, and is respectively clamped into the two magnetic yoke brackets, and the middle part of the magnetic yoke is provided with an installation shaft; an induction coil is wound on the installation shaft on the magnetic yoke, and two leading-out ends of the induction coil are connected with an energy collection circuit; each side face at the cantilever fixed end of the cantilever Liang Kaojin is provided with a permanent magnet, the N pole and the S pole of the permanent magnet are respectively opposite to the two parts of the lower part of the magnetic yoke up and down, but do not contact, and an air gap exists in the up-down direction. The invention has higher energy conversion efficiency and smaller vibration damping.
Description
Technical Field
The invention relates to the field of electromagnetic energy collecting devices, in particular to a device for collecting energy by utilizing two-dimensional vibration of a cantilever beam.
Background
There are a large amount of thing networking node and wireless sensing node of distribution in thing networking and the wireless sensing network, and above-mentioned node all needs to have independent power supply unit respectively, uses more battery at present, produces certain negative effects from this: firstly, the battery power is limited, and the service life of the node is limited; second, secondary pollution caused by chemical batteries poses a threat to the natural environment and the living beings therein. Aiming at the problems, the research on the energy collection technology to realize the self-power supply of the nodes of the Internet of things by using renewable energy sources is significant.
A variety of vibration sources may be encountered in life, for example, a washing machine with a main vibration frequency greater than 110Hz and a diesel engine with a typical vibration frequency of 70Hz. Many scholars have been devoted to research into converting vibration energy into electric energy, and existing devices can be broadly classified into 3 forms of electromagnetic type, piezoelectric type and electrostatic type according to the principle of energy harvesting, wherein the electrostatic type has less research on the basis of low electricity generation.
Vibration is also ubiquitous in natural environments, such as up-and-down vibration, automobile jolt, branch swaying with wind, wave fluctuation and the like generated when people walk. By observation, most vibrations in natural environments have the following characteristics that can be referred to when designing a vibration energy harvesting device:
1. the vibration frequency is low. The largest vibration in natural environment is characterized by low frequency, and the typical vibration frequency is generally below 2 Hz. For example, walking frequency is about 1Hz, jogging is about 2Hz, and sea surface wave vibration period is 0.4 seconds to tens of seconds.
2. The amplitude is relatively large. The walking can generate vibration of a few centimeters in the vertical direction, and the sea wave height is from tens of centimeters to tens of meters.
The 2 problems described above present a certain difficulty in energy harvesting in the secondary nature because most vibration energy harvesting devices currently under investigation operate at frequencies from tens of Hz to hundreds of Hz, while the amplitude of the natural environmental vibrations far exceeds the limits of motion of their moving parts. Thus, a cantilever beam vibration energy collecting structure appears, and external low-frequency and larger-amplitude vibration impacts the cantilever beam to excite the cantilever beam to collect energy in a mode of generating high-frequency and larger-amplitude free vibration. The research group of Beeby et al, university of south Amton, UK, has been working on the development of small electromagnetic vibration energy harvesting devices, and the papers Beeby S P, torah R N, tudor M J, glynne-Jones P, O' Donnell T, saha C R, roy S.A microelectromagnetic generator for vibration energy harvesting [ J ]. JOURNAL OF MICROMECHANICS AND MICROENGINEERING,2007,17:1257-1265 published in 2007 have caused bombings that are widely reported by major world media. The cantilever beam type vibration energy collecting device reported in the paper comprises a cantilever beam serving as an elastic element, wherein 2 groups of 4 rare earth permanent magnets are fixed at the tail end of the beam, and coils among the 2 groups of permanent magnets are motionless when the beam vibrates, so that electromotive force is generated in the coils. The total volume of the device is 0.15cm3, the coil winding is 2300 turns, and the voltage reaches 428mV and the power is 46 mu W when the vibration frequency is 52Hz and the acceleration is 0.59m/s 2. 2015 paper Li, ping; gao, shiqiao; cai, huatong. Modeling and analysis of hybrid piezoelectric and electromagnetic energy harvesting from random architectures, microsystem Technologies,2015,21 (2): 401-414, discusses a vibration energy harvesting device of clamped beam construction having two separate sets of electromagnetic and piezoelectric energy harvesting devices.
In addition to the two papers, there are a great deal of published documents on electromagnetic vibration energy harvesting devices with cantilever and clamped beam structures, but they all have common drawbacks: firstly, a closed magnetic circuit is not realized, namely, magnetic lines of force pass through a longer distance in a medium with large magnetic resistance such as air, so that the magnetic induction intensity is necessarily reduced, the power generation is extremely unfavorable to increase, and otherwise, the power generation is greatly increased if the closed magnetic circuit is realized; second, some of the components of the magnetic circuit (including the coil) in the device are involved in vibration, and some are not involved, resulting in the problem that the magnetic force between the components hinders vibration.
Disclosure of Invention
In order to overcome the defects of lower energy conversion efficiency and larger vibration damping of the existing electromagnetic vibration energy collecting device with the cantilever beam and clamped beam structures, the invention provides the closed magnetic circuit cantilever beam two-dimensional vibration energy collecting device with higher energy conversion efficiency and smaller vibration damping.
The technical scheme adopted for solving the technical problems is as follows:
the two-dimensional vibration energy collecting device for the closed magnetic circuit cantilever beam comprises a cantilever beam fixed end and cantilever beams, wherein the cantilever beam fixed end and the cantilever beams are made of non-magnetic materials, one end of each cantilever beam is inserted into and fixedly installed on the cantilever beam fixed end, the cross section of each cantilever beam is square, 4 groups of magnetic yoke brackets are installed and fixed on the cantilever beam fixed end, 2 magnetic yoke brackets are arranged in each group, and one group of magnetic yoke brackets corresponds to one side face of each cantilever beam;
one side of the magnetic yoke bracket, which is far away from the fixed end, is provided with an inclined plane for avoiding collision with the cantilever beam during vibration; the magnetic yoke brackets are made of nonmagnetic materials, a magnetic yoke is arranged between the two magnetic yoke brackets, the magnetic yoke is made of soft magnetic materials, the magnetic yoke is in a bilateral symmetry shape when seen from the installation position of the magnetic yoke and is respectively clamped into the two magnetic yoke brackets, and the middle part of the magnetic yoke is provided with an installation shaft; the installation shaft on the magnetic yoke is wound with an induction coil, and two leading-out ends of the induction coil are connected with an energy collection circuit;
each side face at the cantilever fixed end of the cantilever Liang Kaojin is provided with a permanent magnet, the N pole and the S pole of the permanent magnet are respectively opposite to the two parts of the lower part of the magnetic yoke up and down, but do not contact, and an air gap exists in the up-down direction.
Further, the upper surface of each set of yoke brackets has two screw holes, which are located in a non-centered position, and both screw holes are biased toward the other yoke bracket.
Preferably, 8 magnetic yoke brackets are installed and fixed in 8 rectangular holes on the fixed end of the cantilever beam.
Still further, the yoke has a slot hole respectively with the upper contact surface of yoke support, every slot hole of yoke upper portion has two sets of screws and its gasket respectively, the screw passes the slot hole, tightly fixes the yoke on two yoke supports, the screw and its gasket are non-magnetic material.
Furthermore, the lower parts of the left and right parts of the magnetic yoke are both trapezoid.
The permanent magnet is arranged at the fixed end of the cantilever Liang Kaojin cantilever beam in an adhesive mode.
The permanent magnet is shallow U-shaped, and the two upper ends of the U-shaped are respectively an N pole and an S pole of the permanent magnet.
And the tail part of the cantilever beam is provided with a counterweight.
The invention discusses the following three conditions when the cantilever beam vibrates up and down after being excited by external force:
first, when the cantilever beam is in equilibrium. The upper and lower closed magnetic circuits of the cantilever beam in the device are related to up-and-down vibration. The closed magnetic circuit returns to the permanent magnet S pole above the cantilever beam from the permanent magnet N pole above the cantilever beam through the air gap, the magnetic yoke above the cantilever beam and the air gap; a corresponding closed magnetic circuit is also present below. The two closed magnetic circuits are in existence because the width of the air gap at two positions is smaller, so that the magnetic leakage is less, and the energy conversion efficiency is high. Since the magnetic resistance of the magnetic yoke in the magnetic circuit is negligible, the magnetic resistance is almost completely from the air gap, and the smaller width of the air gap is smaller, and the magnetic induction intensity of the two closed magnetic circuits is at a medium level.
Secondly, when the cantilever beam vibrates upwards and bends, the width of the two air gaps in the closed magnetic circuit above the cantilever beam is further narrowed, the magnetic resistance of the two air gaps is sharply reduced, the total magnetic resistance in the closed magnetic circuit is sharply reduced, the magnetic induction intensity of the magnetic circuit is sharply increased, the magnetic flux of the magnetic circuit is sharply increased, and the flux linkage passing through the coil is also sharply increased. In contrast, the width of the two air gaps in the closed magnetic circuit below the cantilever beam is further expanded, the magnetic resistance of the two air gaps is sharply increased, the total magnetic resistance in the closed magnetic circuit is sharply increased, the magnetic induction intensity of the magnetic circuit is sharply reduced, the magnetic flux of the magnetic circuit is sharply reduced, and the flux linkage passing through the coil is sharply reduced.
Thirdly, when the cantilever beam vibrates downwards to bend, the width of the two air gaps in the closed magnetic circuit above the cantilever beam is enlarged, and the width of the two air gaps in the closed magnetic circuit below the cantilever beam is narrowed. As a result, the coil flux linkage corresponding to the closed magnetic circuit above the cantilever beam drops sharply, and the coil flux linkage corresponding to the closed magnetic circuit below the cantilever beam rises sharply.
Compared with the three conditions, in the vertical vibration process of the cantilever beam, the flux linkage corresponding to the coil of the closed magnetic circuit above and below the cantilever beam changes sharply, the changing directions are opposite, and stronger opposite induced electromotive force is generated in the coil according to the electromagnetic induction principle. Because the coil above the cantilever beam is connected with the homonymous end of the coil below the cantilever beam, the other pair of terminals is used as the leading-out end, and the electromotive force multiplied by the single coil can be obtained at the leading-out end, so that the purpose of vibration energy collection is achieved.
In the same way, in the process of vibrating the cantilever beam left and right, the magnetic linkage of the coils arranged on the left side and the right side of the cantilever beam is obviously changed, meanwhile, as the coil on the left side of the cantilever beam is connected with the homonymous end of the coil on the right side of the cantilever beam, the other pair of terminals are used as the leading-out ends, and electromotive force multiplied by the single coil can be obtained at the leading-out ends, so that the purpose of collecting vibration energy is achieved.
The beneficial effects of the invention are mainly shown in the following steps: firstly, a closed magnetic circuit is realized, a large amount of magnetic flux leakage is avoided, and the energy conversion efficiency is high; secondly, the magnetic induction intensity and the coil flux linkage are changed by utilizing the change of the air gap width in the closed magnetic circuit in the vibration process, so that electromotive force is generated, and the generated electromotive force is higher due to the fact that the magnetic induction intensity and the coil flux linkage are greatly changed due to the tiny change of the air gap width, so that the energy conversion efficiency is further improved; thirdly, the whole closed magnetic circuit in the device is close to the fixed end of the cantilever beam, the magnetic force arm is short, and the moment is small, so that the vibration is weakened while the vibration is strengthened, but the interference to the vibration in a period is small, meanwhile, the force and the moment of the closed magnetic circuit to the cantilever beam at the balance position are symmetrically arranged, the action of the magnetic force before the movement direction of the cantilever beam is not changed is favorable for expanding the vibration at the beginning of the vibration, and the vibration is favorable; fourth, energy harvesting may be performed using vibrations in two directions.
Drawings
FIG. 1 is a schematic diagram of a closed magnetic circuit cantilever two-dimensional vibration energy harvesting device, with the fixed end of the cantilever removed.
Fig. 2 is an assembly view of the device.
Fig. 3 is a yoke diagram.
Fig. 4 is a diagram of a permanent magnet.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 1 to 4, a closed magnetic circuit cantilever beam two-dimensional vibration energy collecting device generates free vibration with certain persistence under external excitation, and energy is collected by an electromagnetic device with a closed magnetic circuit to supply power for a low-power consumption wireless sensor node and an internet of things node. The specific structure thereof is described below:
the device is provided with a cantilever beam fixing end 1, as shown in fig. 2, and is made of non-magnetic materials, is non-magnetic, and is required to be firm and stable.
Furthermore, the cantilever beam 2, see fig. 1 and 2, is made of a non-magnetic material, and is required to be non-magnetic, and one end of the cantilever beam is inserted into and firmly mounted on the fixed end of the cantilever beam; meanwhile, the cantilever beam is used as an elastic element, and is required to have better toughness. The cantilever beam has a square cross section, can receive external excitation in the up-down direction and the left-right direction, and collects energy by utilizing vibration in the up-down direction and the left-right direction. The weight of the cantilever tail is increased by the counterweight at the tail of the cantilever, so that the vibration starting and continuous free vibration are facilitated.
Further, a total of 8 yoke brackets 3 of 4 groups are installed and fixed in 8 rectangular holes on the fixed end, see fig. 1 and 2, and one group of yoke brackets corresponds to one side face of the cantilever beam. The magnetic yoke bracket is made of non-magnetic materials, is non-magnetic, and has high rigidity. And when the mounting position is seen, one side of the magnetic yoke bracket, which is far away from the fixed end, is provided with an inclined plane so as to avoid collision with the cantilever beam during vibration. The upper surface of the yoke bracket has two screw holes which are not centered but slightly offset to the other yoke bracket paired therewith, resulting in a unique difference between a set of two yoke brackets.
Furthermore, a magnetic yoke 4 is installed between each group of magnetic yoke brackets, see fig. 1, 2 and 3, and the total number of the magnetic yokes is 4, and the magnetic yokes are made of soft magnetic materials and have good magnetic conductivity. The magnet yoke installation positions are in bilateral symmetry, and are respectively clamped into a group of two magnet yoke brackets. The upper contact surfaces of the magnet yoke and the magnet yoke bracket are respectively provided with a long hole. The lower parts of the left and right parts of the magnetic yoke are both trapezoid. The middle part of the magnetic yoke is provided with a mounting shaft.
Further, two sets of screws and spacers 5 are respectively arranged in two long holes on the upper part of the magnetic yoke, and the magnetic yoke is tightly fixed in a set of two screw holes of the magnetic yoke bracket through the long holes, so that the screws and the spacers are required to be made of non-magnetic materials, such as aluminum.
Further, the mounting shaft on the yoke is wound with a coil 6 of enameled copper wire material, see fig. 1 and 2, for a total of 4. The coil above the cantilever beam is connected with the homonymous end of the coil below the cantilever beam, and the other pair of terminals are used as leading-out ends; the left coil of the cantilever beam is connected with the homonymous end of the right coil of the cantilever beam, and the other pair of terminals are used as leading-out ends. The two pairs of outlets are connected with related energy collecting circuits, and special chips can realize the function.
Further, the permanent magnet 7 is mounted by means of adhesion at the cantilever beam fixing end of the cantilever Liang Kaojin, see fig. 1 and 4, which is made of permanent magnet material and requires a good rigidity. The permanent magnet is shallow U-shaped, and the two upper ends of the U-shaped are respectively an N pole and an S pole of the permanent magnet. The N pole and the S pole of the permanent magnet are respectively opposite to the two trapezoid parts at the lower part of the magnetic yoke up and down, but do not contact, and an air gap with smaller width exists in the up-down direction, and the width is about 0.5mm. Because the long hole is arranged above the magnetic yoke, a certain adjustment margin is provided for the relative position of the magnetic yoke and the permanent magnet in the longitudinal direction of the cantilever beam; furthermore, the two trapezoid parts at the lower part of the magnetic yoke enable the area of the lower part of the magnetic yoke, which is opposite to the N pole and the S pole of the permanent magnet, to be adjustable.
The embodiment discusses the following three cases when the cantilever beam vibrates up and down after being excited by an external force:
first, when the cantilever beam is in equilibrium. The upper and lower closed magnetic circuits of the cantilever beam in the device are related to up-and-down vibration. The closed magnetic circuit returns to the permanent magnet S pole above the cantilever beam from the permanent magnet N pole above the cantilever beam through the air gap, the magnetic yoke above the cantilever beam and the air gap; a corresponding closed magnetic circuit is also present below. The two closed magnetic circuits are in existence because the width of the air gap at two positions is smaller, so that the magnetic leakage is less, and the energy conversion efficiency is high. Since the magnetic resistance of the magnetic yoke in the magnetic circuit is negligible, the magnetic resistance is almost completely from the air gap, and the smaller width of the air gap is smaller, and the magnetic induction intensity of the two closed magnetic circuits is at a medium level.
Secondly, when the cantilever beam vibrates upwards and bends, the width of the two air gaps in the closed magnetic circuit above the cantilever beam is further narrowed, the magnetic resistance of the two air gaps is sharply reduced, the total magnetic resistance in the closed magnetic circuit is sharply reduced, the magnetic induction intensity of the magnetic circuit is sharply increased, the magnetic flux of the magnetic circuit is sharply increased, and the flux linkage passing through the coil is also sharply increased. In contrast, the width of the two air gaps in the closed magnetic circuit below the cantilever beam is further expanded, the magnetic resistance of the two air gaps is sharply increased, the total magnetic resistance in the closed magnetic circuit is sharply increased, the magnetic induction intensity of the magnetic circuit is sharply reduced, the magnetic flux of the magnetic circuit is sharply reduced, and the flux linkage passing through the coil is sharply reduced.
Thirdly, when the cantilever beam vibrates downwards to bend, the width of the two air gaps in the closed magnetic circuit above the cantilever beam is enlarged, and the width of the two air gaps in the closed magnetic circuit below the cantilever beam is narrowed. As a result, the coil flux linkage corresponding to the closed magnetic circuit above the cantilever beam drops sharply, and the coil flux linkage corresponding to the closed magnetic circuit below the cantilever beam rises sharply.
Compared with the three conditions, in the vertical vibration process of the cantilever beam, the flux linkage corresponding to the coil of the closed magnetic circuit above and below the cantilever beam changes sharply, the changing directions are opposite, and stronger opposite induced electromotive force is generated in the coil according to the electromagnetic induction principle. Because the coil above the cantilever beam is connected with the homonymous end of the coil below the cantilever beam, the other pair of terminals is used as the leading-out end, and the electromotive force multiplied by the single coil can be obtained at the leading-out end, so that the purpose of vibration energy collection is achieved.
In the same way, in the process of vibrating the cantilever beam left and right, the magnetic linkage of the coils arranged on the left side and the right side of the cantilever beam is obviously changed, meanwhile, as the coil on the left side of the cantilever beam is connected with the homonymous end of the coil on the right side of the cantilever beam, the other pair of terminals are used as the leading-out ends, and electromotive force multiplied by the single coil can be obtained at the leading-out ends, so that the purpose of collecting vibration energy is achieved. .
The scheme of the embodiment realizes a closed magnetic circuit, eliminates a large amount of magnetic leakage and has high energy conversion efficiency; the change of the width of the air gap in the closed magnetic circuit in the vibration process is utilized to change the magnetic induction intensity and the coil flux linkage to generate electromotive force, and the generated electromotive force is higher due to the large change of the magnetic induction intensity and the coil flux linkage caused by the tiny change of the width of the air gap, so that the energy conversion efficiency is further improved; the closed magnetic circuit in the device is integrally close to the fixed end of the cantilever beam, the magnetic force arm is short, and the moment is small, so that the vibration is weakened while the vibration is strengthened, but the interference to the vibration in one period is small, meanwhile, the force and the moment of the closed magnetic circuit to the cantilever beam are symmetrically arranged, and the force and the moment of the closed magnetic circuit to the cantilever beam are 0 at the balance position, so that the effect of the magnetic force is favorable for expanding the vibration before the movement direction of the cantilever beam is unchanged at the beginning of the vibration, and the vibration is favorable; energy harvesting may be performed using vibrations in two directions.
Claims (8)
1. The utility model provides a closed magnetic circuit cantilever beam two-dimensional vibration energy collection device, includes cantilever beam stiff end and cantilever beam, cantilever beam stiff end and cantilever beam are non-magnetic material and make, cantilever beam one end inserts and fixed mounting in the cantilever beam stiff end, the cantilever beam cross-section is square, its characterized in that: the cantilever beam fixing end is provided with 4 groups of magnetic yoke brackets, each group of magnetic yoke brackets is 2, and one group of magnetic yoke brackets corresponds to one side face of the cantilever beam;
the side, facing the cantilever beam, of the magnetic yoke bracket is provided with an inclined plane for avoiding collision with the cantilever beam during vibration; the magnetic yoke brackets are made of nonmagnetic materials, a magnetic yoke is arranged between two magnetic yoke brackets in a group, the magnetic yoke is made of soft magnetic materials, the magnetic yoke is in a bilateral symmetry shape when seen from the installation position of the magnetic yoke and is respectively clamped into the two magnetic yoke brackets, and the middle part of the magnetic yoke is provided with an installation shaft; the installation shaft on the magnetic yoke is wound with an induction coil, and two leading-out ends of the induction coil are connected with an energy collection circuit;
each side face at the fixed end of the cantilever Liang Kaojin cantilever beam is provided with a permanent magnet, the N pole and the S pole of the permanent magnet are respectively opposite to the two parts of the lower part of the magnetic yoke up and down, but do not contact, and an air gap exists in the up-down direction.
2. The closed magnetic circuit cantilever two-dimensional vibration energy harvesting device of claim 1, wherein: the upper surface of each group of magnetic yoke bracket is provided with two screw holes, the two screw holes are positioned at the non-center position, and the two screw holes are biased to the other magnetic yoke bracket.
3. The closed magnetic circuit cantilever two-dimensional vibration energy harvesting device of claim 1 or 2, wherein: and 8 magnetic yoke brackets are installed and fixed in 8 rectangular holes on the fixed end of the cantilever beam.
4. The closed magnetic circuit cantilever two-dimensional vibration energy harvesting device of claim 1 or 2, wherein: the upper contact surfaces of the magnet yoke and the magnet yoke brackets are respectively provided with a long hole, each long hole at the upper part of the magnet yoke is respectively provided with two groups of screws and gaskets thereof, the screws penetrate through the long holes to tightly fix the magnet yoke on the two magnet yoke brackets, and the screws and the gaskets thereof are made of non-magnetic materials.
5. The closed magnetic circuit cantilever two-dimensional vibration energy harvesting device of claim 1 or 2, wherein: the lower parts of the left and right parts of the magnetic yoke are both trapezoid.
6. The closed magnetic circuit cantilever two-dimensional vibration energy harvesting device of claim 1 or 2, wherein: the permanent magnet is arranged at the fixed end of the cantilever Liang Kaojin cantilever beam in an adhesive mode.
7. The closed magnetic circuit cantilever two-dimensional vibration energy harvesting device of claim 1 or 2, wherein: the permanent magnet is shallow U-shaped, and the two upper ends of the U-shaped are respectively an N pole and an S pole of the permanent magnet.
8. The closed magnetic circuit cantilever two-dimensional vibration energy harvesting device of claim 1 or 2, wherein: and the tail part of the cantilever beam is provided with a counterweight.
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| CN104868690A (en) * | 2015-05-14 | 2015-08-26 | 浙江工业大学 | Vibration energy collecting device |
| CN106712439A (en) * | 2016-12-30 | 2017-05-24 | 浙江工业大学 | Two-dimensional oscillating magnetic levitation energy collecting device |
| CN106982006A (en) * | 2017-05-08 | 2017-07-25 | 南京邮电大学 | A kind of piezoelectricity electromagnetism combined vibrating energy capture device based on permeability magnetic material |
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