CN216390824U - Magnetoelectric motion energy collector - Google Patents
Magnetoelectric motion energy collector Download PDFInfo
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- CN216390824U CN216390824U CN202121028740.8U CN202121028740U CN216390824U CN 216390824 U CN216390824 U CN 216390824U CN 202121028740 U CN202121028740 U CN 202121028740U CN 216390824 U CN216390824 U CN 216390824U
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Abstract
The utility model discloses a magnetoelectric motion energy collector, which relates to the field of energy collection and comprises an external rectifying circuit, a shell, a movable permanent magnet, a bias magnet and two magnetoelectric composite layers, wherein the movable permanent magnet, the bias magnet and the two magnetoelectric composite layers are packaged in the shell; the movable permanent magnet, the bias magnet and the magnetoelectric composite layer are arranged in an isolated way; the bias magnet is fixed at the bottom of the shell, and the movable permanent magnet is superposed with the bias magnet through external movement to provide a periodically-changing magnetic field; the two magnetoelectric composite layers are arranged on the inner wall of the shell above the bias magnet and used for outputting alternating charges; the two magnetoelectric composite layers are connected and then connected with the input end of an external rectifying circuit, the external rectifying circuit is used for converting alternating current into direct current, and the output end of the external rectifying circuit is connected with an external device to supply power to the external device. The collector is convenient to integrate on human body wearing equipment, does not depend on a current-induced magnetic field, and converts the biological mechanical energy generated by external motion into electric energy through a variable magnetic field to be output or collected.
Description
Technical Field
The utility model relates to the field of energy collection, in particular to a magnetoelectric motion energy collector.
Background
In recent years, with the rapid development of mobile electronic devices and the internet of things, the power consumption of small highly integrated devices is increasing. However, conventional batteries have a limited life and must be replaced or recharged periodically, rendering the device incapable of continuous operation. The energy collector can continuously collect energy from the surrounding environment and directly or in cooperation with a traditional battery, realize the continuous operation of the electronic device. Among many energies, bio-mechanical energy is widely present in human motion, and thus has the greatest application prospect.
In order to collect the biomechanical energy generated by human body movement, researchers try various methods and technologies to collect the biomechanical energy from the daily human body movement for the continuous operation of mobile electronic equipment, and due to the fact that the emerging multiferroic material can realize the coupling of electricity and magnetism, the researchers are attracted to develop multiferroic magnetoelectric energy collectors, and the traditional magnetoelectric energy collectors have high requirements on working environments: in the process of energy collection, the device needs to stay near the magnetic field, which greatly limits the moving range of the energy collector, reduces the portability of the energy collector, and is difficult to apply to portable small-sized integrated devices.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a magnetoelectric motion energy collector aiming at the problems that the conventional magnetoelectric energy collecting device cannot be separated from a strong magnetic field source and cannot be suitable for a portable energy collector wearable on a human body because the conventional magnetoelectric energy collecting device is limited in a fixed area. The collector does not rely on a current-induced magnetic field, and supplies power to a low-power device wearable on a human body by collecting bio-mechanical energy generated by motion.
The technical scheme of the utility model is as follows:
a magnetoelectric motion energy collector comprises an external rectifying circuit, a shell with a built-in sleeve, a movable permanent magnet, a bias magnet and two magnetoelectric composite layers, wherein the movable permanent magnet, the bias magnet and the two magnetoelectric composite layers are packaged in the shell; the movable permanent magnet is arranged in the sleeve and is isolated from the bias magnet and the magnetoelectric composite layer; the bias magnet is fixed at the bottom of the shell, and the movable permanent magnet is superposed with the bias magnet through external movement to provide a periodically-changing magnetic field; the two magnetoelectric composite layers are arranged on the inner wall of the shell above the bias magnet and used for outputting alternating charges; the two magnetoelectric composite layers are connected and then connected with the input end of an external rectifying circuit, the external rectifying circuit is used for converting alternating current into direct current, and the output end of the external rectifying circuit is connected with an external device to supply power to the external device.
The technical scheme is that the movable permanent magnet comprises a permanent magnet and two springs, the first ends of the two springs are fixed on the upper surface and the lower surface of the permanent magnet respectively, the second ends of the two springs are suspended, the permanent magnet and the two springs move up and down in the sleeve together, and the springs are used for reducing energy loss in the movement process of the permanent magnet.
The further technical scheme is that two magnetoelectric composite layers are oppositely arranged on the inner wall of a shell and both adopt sandwich structures, the first magnetoelectric composite layer sequentially comprises a first magnetostrictive layer I, a first piezoelectric layer and a first magnetostrictive layer II, and the second magnetoelectric composite layer sequentially comprises a second magnetostrictive layer I, a second piezoelectric layer and a second magnetostrictive layer II; the first magnetostrictive layer I and the second magnetostrictive layer II are respectively adhered to the inner wall of the shell, and lead wires are respectively led out to be connected with the input end of the external rectifying circuit.
The further technical scheme is that the first magnetostrictive layer II is connected with the second magnetostrictive layer I, so that the series connection of two magnetoelectric composite layers is realized.
The further technical scheme is that the first magnetostrictive layer I is connected with the second magnetostrictive layer I, and the first magnetostrictive layer II is connected with the second magnetostrictive layer II, so that the parallel connection of two magnetoelectric composite layers is realized.
The further technical scheme is that the first magnetostrictive layers I and II and the second magnetostrictive layers I and II are respectively formed by bonding three pieces of magnetostrictive materials.
The further technical scheme is that the magnetoelectric composite layer adopts a coupling mode of polarization in the thickness direction and magnetization in the length direction.
The further technical proposal is that the sizes of the first piezoelectric layer and the second piezoelectric layer are both 28 multiplied by 6 multiplied by 0.6mm3The first magnetostrictive layers I and II and the second magnetostrictive layers I and II are all 40 multiplied by 6 multiplied by 0.02mm in size3。
The beneficial technical effects of the utility model are as follows:
the utility model provides an energy collector simple structure, small, can carry on and realize human wearing in small-size electronic equipment, and this energy collector does not rely on the induced magnetic field of electric current, can drive movable permanent magnet up-and-down motion wherein in the human motion process, through the magnetic field that produces periodic variation with the stack of bias magnet, cause magnetostrictive material to lengthen and shorten periodically, because magnetostrictive material has bonded the piezoelectric layer, the piezoelectric layer will receive periodic variation's stress, thereby produce alternating charge at upper and lower surface, draw forth to outside rectifier circuit through the wire, after turning into the direct current with the alternating current, can be used for exporting or collecting the electric energy, supply power for outside low-power consumption device.
Drawings
Fig. 1 is a front view of a magnetoelectric motion energy collector provided in the present application.
Fig. 2 is a top view of a magnetoelectric motion energy collector provided in the present application.
Fig. 3 is a schematic diagram of an external circuit of the magnetoelectric motion energy collector provided in the present application.
Fig. 4 is a schematic structural diagram of a magnetoelectric composite layer provided in the present application.
Fig. 5 is a graph showing the voltage change with time when the capacitor is charged by the external device under the conditions of (a) different capacitance, (b) different acceleration, and (c) different frequency.
Fig. 6(a) is a graph of voltage generated under actual measurement of slow walking, fast walking and running, fig. 6(b) is a graph of voltage variation of different capacitors respectively charged by movement, and fig. 6(c) is a graph of voltage variation of 50mAh lithium ion battery charged by the magnetoelectric movement energy collector provided by the present application.
Detailed Description
The following further describes the embodiments of the present invention with reference to the drawings.
Referring to fig. 1-3, a magnetoelectric motion energy collector comprises an external rectification circuit 1, a casing 22 with a built-in sleeve 21, a movable permanent magnet 3 encapsulated in the casing 22, a bias magnet 4 and two magnetoelectric composite layers 5, and the structures of the parts are respectively described below.
The movable permanent magnet 3 is disposed in the sleeve 21, and is provided separately from the bias magnet 4 and the magnetoelectric composite layer 5. The movable permanent magnet 3 comprises a permanent magnet 31 and two springs 32, first ends of the two springs 32 are respectively fixed on the upper surface and the lower surface of the permanent magnet 31, second ends of the two springs 32 are suspended, when the external movement drives the energy collector to move, the permanent magnet 31 and the two springs 32 move up and down in the sleeve 21 together, and the springs 32 are used for reducing energy loss in the movement process of the permanent magnet, so that the permanent magnet 31 obtains larger kinetic energy.
The bias magnet 4 is fixed to the bottom of the housing 22 by epoxy resin, and the movable permanent magnet 3 is moved by the outside to superpose the bias magnet 4 for providing a periodically changing magnetic field.
Two magnetoelectric composite layers 5 are arranged on the inner wall of the shell above the bias magnet 4 and are oppositely arranged, the two magnetoelectric composite layers 5 are used for outputting alternating charges, the two magnetoelectric composite layers 5 are connected with the input end of the external rectifying circuit 1 after being connected, the external rectifying circuit 1 is used for converting alternating current into direct current, and the output end of the external rectifying circuit 1 is connected with an external device to supply power for the external device.
Specifically, as shown in fig. 4, the two magnetoelectric composite layers 5 both adopt a sandwich structure in which the coupling mode is polarization in the thickness direction and magnetization in the length direction, that is, a sandwich structure in the L-T coupling mode. The first magnetoelectric composite layer sequentially comprises a first magnetostrictive layer I51, a first piezoelectric layer 52 and a first magnetostrictive layer II 53, and the second magnetoelectric composite layer sequentially comprises a second magnetostrictive layer I54, a second piezoelectric layer 55 and a second magnetostrictive layer II 56 which are bonded through epoxy resin. The first magnetostrictive layer I51 and the second magnetostrictive layer II 56 are respectively adhered to the inner wall of the shell, and lead wires are respectively led out to be connected with the input end of the external rectifying circuit 1.
When the two magnetoelectric composite layers 5 are connected in series, the first magnetostrictive layer II 53 is connected with the second magnetostrictive layer I54; when the two magnetoelectric composite layers 5 are connected in parallel, the first magnetostrictive layer I51 is connected with the second magnetostrictive layer I54, and the first magnetostrictive layer II 53 is connected with the second magnetostrictive layer II 56.
Optionally, the first magnetostrictive layers i 51 and ii 53 and the second magnetostrictive layers i 54 and ii 56 are formed by bonding three magnetostrictive materials with epoxy resin, so that the rigidity of the magnetoelectric composite layer 5 is increased, and the collection efficiency is improved.
Optionally, the first piezoelectric layer 52 and the second piezoelectric layer 55 are each 28 × 6 × 0.6mm in size3The material is piezoelectric single crystal: lead indium niobate-lead magnesium niobate-lead titanate (PIN-PMN-PT); the dimensions of the first magnetostrictive layers I51, II 53 and the second magnetostrictive layers I54, II 56 were 40X 6X 0.02mm each3The material is amorphous ferrosilicon boron (Metglas).
Optionally, the epoxy resin used in the present application is a room temperature curing two-component adhesive.
Optionally, the external device includes a capacitor, a lithium ion battery, and the like.
The working principle of the magnetoelectric motion energy collector provided by the application is as follows:
the movable permanent magnet 3 can be driven to move up and down in the process of human body movement, a periodically-changed magnetic field is generated by superposition of the movable permanent magnet and the bias magnet 4, so that the magnetostrictive material is periodically extended and shortened, and as the magnetostrictive material is bonded with the first piezoelectric layer 52 or the second piezoelectric layer 55, the piezoelectric layers are subjected to periodically-changed stress, so that alternating charges are generated on the upper surface and the lower surface, and are led out to the external rectifying circuit 1 through a lead, and after alternating current is converted into direct current, the direct current can be used for outputting or collecting electric energy to supply power to external devices such as a capacitor, a lithium ion battery and the like.
The following also provides a test result chart for testing the electric energy output capability of the magnetoelectric motion energy collector:
for the whole energy collector, the energy collector was simulated to charge the capacitor under vibration excitation, and the output voltage of the capacitor with the capacities of 220 muF, 47 muF, 33 muF, 22 muF and 6.8 muF was measured with time, and the voltage change curve is shown in FIG. 5 (a).
At 9 m.s-2、10.2m·s-2、11m·s-2、11.8m·s-2、18m·s-2The output voltage of the capacitor with the capacity of 6.8 muF is measured with time under each acceleration, and the voltage change curve is shown in FIG. 5 (b).
The output voltage of the capacitor with the capacity of 6.8 muF is measured with time at each frequency of 1Hz, 2Hz, 3Hz, 4Hz and 5Hz, and the voltage change curve is shown in FIG. 5 (c).
For the whole energy collector, a real wearing experiment is performed to simulate the conditions of slow walking, fast walking and running, and the change relationship of the output voltage with time is measured respectively as shown in fig. 6 (a).
The vibration generated by the energy collector through motion under the real environment is simulated to charge the capacitors of 6.8 muF, 22 muF, 33 muF and 47 muF respectively, and the charging condition is shown in figure 6 (b).
Energy generated by running and walking for 20 minutes was collected and a 50mAh lithium ion battery was charged as shown in fig. 6 (c).
The external rectifier circuit 1 used in the present application is a conventional commercially available module, and the structure thereof will not be described in detail here.
What has been described above is only a preferred embodiment of the present application, and the present invention is not limited to the above embodiment. It is to be understood that other modifications and variations directly derivable or suggested by those skilled in the art without departing from the spirit and concept of the present invention are to be considered as included within the scope of the present invention.
Claims (8)
1. A magnetoelectric motion energy collector is characterized by comprising an external rectifying circuit, a shell with a built-in sleeve, a movable permanent magnet, a bias magnet and two magnetoelectric composite layers, wherein the movable permanent magnet, the bias magnet and the two magnetoelectric composite layers are packaged in the shell; the movable permanent magnet is arranged in the sleeve and is isolated from the bias magnet and the magnetoelectric composite layer; the bias magnet is fixed at the bottom of the shell, and the movable permanent magnet is moved by the outside to be superposed with the bias magnet and used for providing a periodically-changing magnetic field; the two magnetoelectric composite layers are arranged on the inner wall of the shell above the bias magnet and used for outputting alternating charges; the two magnetoelectric composite layers are connected and then connected with the input end of the external rectifying circuit, the external rectifying circuit is used for converting alternating current into direct current, and the output end of the external rectifying circuit is connected with an external device to supply power to the external device.
2. The magnetoelectric motion energy collector according to claim 1, wherein the movable permanent magnet includes a permanent magnet and two springs, first ends of the two springs are fixed to the upper and lower surfaces of the permanent magnet respectively, second ends of the two springs are suspended, the permanent magnet and the two springs move up and down in the sleeve together, and the springs are used for reducing energy loss in the motion process of the permanent magnet.
3. The magnetoelectric motion energy collector according to claim 1, wherein two magnetoelectric composite layers are oppositely arranged on the inner wall of the housing and both adopt a sandwich structure, the first magnetoelectric composite layer sequentially comprises a first magnetostrictive layer i, a first piezoelectric layer and a first magnetostrictive layer ii, and the second magnetoelectric composite layer sequentially comprises a second magnetostrictive layer i, a second piezoelectric layer and a second magnetostrictive layer ii; the first magnetostrictive layer I and the second magnetostrictive layer II are respectively adhered to the inner wall of the shell, and lead wires are respectively led out to be connected with the input end of the external rectifying circuit.
4. The magnetoelectric motion energy collector according to claim 3, wherein the first magnetostrictive layer II is connected with the second magnetostrictive layer I to realize the series connection of the two magnetoelectric composite layers.
5. The magnetoelectric motion energy collector according to claim 3, wherein the first magnetostrictive layer I is connected with the second magnetostrictive layer I, and the first magnetostrictive layer II is connected with the second magnetostrictive layer II, so that the parallel connection of the two magnetoelectric composite layers is realized.
6. The magnetoelectric motion energy collector according to claim 3, wherein the first magnetostrictive layers I and II and the second magnetostrictive layers I and II are respectively formed by bonding three pieces of magnetostrictive materials.
7. The magnetoelectric motion energy collector according to any one of claims 3 to 6, wherein the magnetoelectric composite layer adopts a coupling mode of thickness direction polarization and length direction magnetization.
8. The magnetoelectric motion energy collector according to any one of claims 3 to 6, wherein the first piezoelectric layer and the second piezoelectric layer each have a size of 28 x 6 x 0.6mm3The first magnetostrictive layers I and II and the second magnetostrictive layers I and II are all 40 multiplied by 6 multiplied by 0.02mm in size3。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121028740.8U CN216390824U (en) | 2021-05-13 | 2021-05-13 | Magnetoelectric motion energy collector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121028740.8U CN216390824U (en) | 2021-05-13 | 2021-05-13 | Magnetoelectric motion energy collector |
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| Publication Number | Publication Date |
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| CN216390824U true CN216390824U (en) | 2022-04-26 |
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| CN202121028740.8U Active CN216390824U (en) | 2021-05-13 | 2021-05-13 | Magnetoelectric motion energy collector |
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| CN (1) | CN216390824U (en) |
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- 2021-05-13 CN CN202121028740.8U patent/CN216390824U/en active Active
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