Orthogonal cantilever beam magnetoelectric conversion device and energy collection method

Abstract

The invention discloses an orthogonal cantilever beam magnetic electricity conversion device and an energy collection method, and belongs to the technical field of energy collectors, the orthogonal cantilever beam magnetic electricity conversion device comprises a main beam with one end fixed and an auxiliary beam perpendicularly fixed to the other end of the main beam, and based on an orthogonal decoupling vibration mode of the main beam and the auxiliary beam, the bending resistance of the main beam structure on the plane of the auxiliary beam is high. Compared with a traditional cantilever beam with the special-shaped end, when the auxiliary beam generates resonance, the main beam cannot generate bending vibration due to the high bending resistance and is still, the weak boundary clamping effect is achieved, the clamping loss is greatly reduced, and the performance of the energy conversion device is further improved. Compared with a traditional cantilever beam with a special-shaped end part, the hybrid energy field of vibration and a magnetic field can be collected at the same time. Under excitation of different frequencies of vibration and magnetic fields, two vibration modes generated on the energy collector are mutually decoupled, and interference and weakening cannot be generated.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy harvesters, and particularly relates to an orthogonal cantilever beam magnetoelectric conversion device and an energy harvesting method. Background Art

[0002] In recent years, with the development of human technology, the demand for electricity has been continuously expanding, and the concept of smart grid has attracted the attention of relevant researchers. The key to realizing the concept of smart grid is the normal operation of a large number of sensors and detectors. At present, these devices generally operate by directly supplying power with batteries. Once the battery runs out of power, the battery needs to be replaced immediately. Therefore, these devices have problems such as short working hours and difficult power supply, and frequent battery replacement will further increase the operation cost of the power grid. Therefore, the energy harvesting technology that collects renewable energy such as magnetic energy and mechanical vibration from the surrounding environment has become a current research hotspot. Among these energies, the power grid equipment environment can provide mechanical vibration energy and stray magnetic field energy of energized cables. Therefore, the magnetoelectric conversion device has become the first choice for power grid energy harvesting. The magnetoelectric conversion device can collect vibration energy and stray magnetic field energy at the same time. Compared with any one of the energy harvesting technologies, it has the advantages of wide use, high power density, and simple integration, and has great application potential.

[0003] At present, the piezoelectric energy harvesting technology also faces many challenges, which limit its application scenarios. Current research mostly focuses on the topological optimization of the traditional single cantilever beam structure. By introducing a special-shaped front beam design, a dual-frequency vibration mode separation mechanism is realized, aiming to synchronously collect vibration and magnetic field energy. However, the special-shaped beam of this design is rigidly connected to the main beam. In actual service, under the excitation of two external frequencies, the two vibration modes are inevitably generated and interact with each other at the same time, greatly offsetting the electrical output performance of the piezoelectric sheet. This inherent defect makes the existing system only able to perform performance characterization in a single energy field (pure vibration or pure magnetic field), and cannot be effectively verified under the typical working conditions of the power grid (magnetic field and vibration composite energy field). From this, two major technical obstacles are derived: First, the energy conversion efficiency is affected by modal interference and it is difficult to meet the power supply requirements of the sensing node; Second, there is a significant deviation between the predicted output characteristics of the device in a mixed field environment and the actual working conditions. The above problems have all restricted the development of the magnetic-force-electricity coupled energy harvester and need to be solved urgently. Summary of the Invention

[0004] The purpose of the present invention is to provide an orthogonal cantilever beam magnetoelectric conversion device and an energy harvesting method to overcome the problems of mutual interference and weakening between vibration modes in the prior art, and the energy conversion efficiency is affected by modal interference and it is difficult to meet the power supply requirements of the sensing node. The present invention can orthogonally decouple the two vibration modes excited by vibration and magnetic field, and is more suitable for the actual application level compared with other special-shaped beam magnetic-force-electricity coupled energy harvesters.

[0005] To achieve the above object, the technical solution adopted by the present invention is as follows: An orthogonal cantilever beam magnetic-electric conversion device includes a main beam fixed at one end and a secondary beam vertically fixed at the other end of the main beam. Both the main beam and the secondary beam are thin plate structures. Piezoelectric sheets are attached to the sides of the main beam and the secondary beam. Two electrode layers are provided on the largest surface of the piezoelectric sheet. One electrode surface of the piezoelectric sheet in contact with the main beam or the secondary beam is grounded for output, and the other electrode surface of the piezoelectric sheet is connected to the positive electrode for output.

[0006] Preferably, the middle part of the secondary beam is fixedly connected to the end of the main beam. One side of the largest surface of the main beam is vertically arranged, and one side of the largest surface of the secondary beam is horizontally arranged. The short side direction of the secondary beam is parallel to the long side direction of the main beam.

[0007] Preferably, one end of the main beam is fixed to the fixed structure by a fixing bolt.

[0008] Preferably, an orthogonal beam perpendicular to both the main beam and the secondary beam is fixed at the ends of the main beam and the secondary beam. The orthogonal beam is a thin plate structure, and a piezoelectric sheet is also attached to the largest surface of the orthogonal beam.

[0009] Preferably, mass blocks are fixedly arranged at both ends of the secondary beam.

[0010] Preferably, the polarization direction of the piezoelectric sheet is along the thickness direction of the piezoelectric sheet.

[0011] Preferably, multiple secondary beams can be arranged on the main beam.

[0012] An energy harvesting method for an orthogonal cantilever beam magnetic-electric conversion device includes the following steps: Vertically fixedly connect the main beam and the secondary beam and attach piezoelectric sheets to the largest surfaces of the main beam and the secondary beam. One electrode surface of the piezoelectric sheet in contact with the main beam or the secondary beam is grounded for output, and the other electrode surface of the piezoelectric sheet is connected to the positive electrode for output; when the orthogonal cantilever beam magnetic-electric conversion device is subjected to a magnetic field or vibration excitation, vibration is generated to obtain corresponding energy.

[0013] Preferably, under the condition of constant acceleration, test the peak-to-peak output voltage of the energy harvester at different frequencies, and test the impedance and output power density of the energy harvester with a rheostat at the resonant frequency; Measure the peak-to-peak voltage at the corresponding resistance by the experimental method, and combine with the volume of the piezoelectric sheet to calculate the power density at each resistance. Finally, take the resistance corresponding to the maximum power density as the impedance to obtain the relationship between the output power and impedance of the magnetic-force-electric coupling energy harvester based on the orthogonal mode under the vibration external excitation.

[0014] Preferably, with the magnetic field strength unchanged, the peak-to-peak voltage that the magneto-electric conversion device of the orthogonal cantilever beam can output in the magnetic field at different frequencies is tested, and the impedance of the energy harvester is tested using a rheostat at the frequency with the maximum output peak-to-peak voltage, and the output power density is calculated; The experimental method is used to obtain the resonant frequency at which the maximum output voltage appears, and the relationship between the peak-to-peak voltage and the frequency of the magneto-force-electric coupling energy harvester based on the orthogonal vibration mode under external magnetic field excitation is formed.

[0015] Preferably, combined with the volume of the piezoelectric sheet, the power density at each resistance is calculated to obtain the impedance of the magneto-electric conversion device of the orthogonal cantilever beam, and finally the relationship between the output power and the impedance of the magneto-force-electric coupling energy harvester based on the orthogonal vibration mode under external magnetic field excitation can be obtained.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects: A magneto-electric conversion device of an orthogonal cantilever beam according to the present invention includes a main beam fixed at one end and a secondary beam vertically fixed at the other end of the main beam. Based on the orthogonal decoupling vibration modes of the main beam and the secondary beam, the main beam structure has strong bending resistance in the plane of the secondary beam. Compared with the traditional end-shaped cantilever beam, when the secondary beam generates resonance, the main beam will not generate bending vibration and remains stationary due to its strong bending resistance, having a weak boundary clamping effect, greatly reducing the clamping loss and further improving the performance of the energy conversion device. Compared with the traditional end-shaped cantilever beam, the present invention can collect the mixed energy fields of vibration and magnetic field simultaneously. Under different frequency excitations of vibration and magnetic field, the two vibration modes generated on the energy harvester are decoupled from each other and will not interfere with and weaken each other.

[0017] Based on the orthogonal decoupling vibration modes of the main beam and the secondary beam, compared with the traditional end-shaped cantilever beam, the present invention is no longer limited to energy collection in the plane, but expands the space to the three-dimensional level. The magneto-electric conversion device of the orthogonal cantilever beam adds an orthogonal direction and expands into a three-dimensional structure to achieve the collection of multi-directional energy.

[0018] There are multiple settings for the piezoelectric sheets in the present invention, which can separately collect the energy of the magnetic field and vibration, facilitating the access of the subsequent energy collection management circuit; the polarization directions of the two parts of the piezoelectric sheets can be opposite or the same, and two circuit connection methods, namely electrical parallel with a larger current or electrical series with a larger voltage, can be selected according to actual requirements, increasing the flexibility of the application of the magneto-electric conversion device; the two parts of the piezoelectric sheets are located on the orthogonal structure, which can collect the vibration energy of two frequencies, further broadening the application range of the magneto-electric conversion device.

[0019] Preferably, multiple secondary beams can be arranged on the main beam, and the number of end secondary beams can be expanded according to different environmental requirements. Under three-dimensional energy excitation, the electrode surfaces and ground surfaces of each piezoelectric sheet can independently generate charges, realizing synchronous collection of energy in three-dimensional directions. Brief Description of the Drawings

[0020] Figure 1 It is an assembly schematic diagram of the orthogonal cantilever beam magnetic-electric conversion device described in the embodiment of the present invention.

[0021] Figure 2 It is a structural schematic diagram of the orthogonal cantilever beam magnetic-electric conversion device described in the embodiment of the present invention.

[0022] Figure 3 It is a schematic diagram of the vibration mode of the main beam of the cantilever beam in the simulation environment of the orthogonal cantilever beam magnetic-electric conversion device described in the first embodiment of the present invention.

[0023] Figure 4 It is a schematic diagram of the vibration mode of the secondary beam of the cantilever beam in the simulation environment of the orthogonal cantilever beam magnetic-electric conversion device described in the second embodiment of the present invention.

[0024] Figure 5 It is a schematic diagram of the three-dimensional energy collection structure described in the embodiment of the present invention.

[0025] In the figure, 101 is a piezoelectric sheet, 102 is a main beam, 103 is a secondary beam, 104 is a fixing bolt, 105 is a mass block, 106 is a fixing structure, 201 is a first electrode surface, 202 is a second electrode surface, 203 is a third electrode surface, and 204 is a ground surface. Detailed Embodiment

[0026] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0027] It should be noted that the terms "first", "second", etc. in the description, claims and above-mentioned drawings of the present invention are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0028] As Figure 1 shown, the present invention provides an orthogonal cantilever beam magnetoelectric conversion device, which adopts the design concept of weak boundary clamping effect. By generating mutually orthogonal vibration mode shapes between the main beam and the auxiliary beam, the interference between the two is reduced, and independent energy harvesting processes are realized for each, effectively solving the coupling problem between the special-shaped beam and the main beam, and ensuring that the energy in the vibration mode can be independently and efficiently harvested. Specifically, it includes a main beam 102 fixed at one end and an auxiliary beam 103 vertically fixed at the other end of the main beam 102. Both the main beam 102 and the auxiliary beam 103 are thin plate structures. Piezoelectric sheets are attached to the sides of the main beam 102 and the auxiliary beam 103. Two electrode layers are arranged on the largest surface of the piezoelectric sheet. One electrode surface of the piezoelectric sheet in contact with the main beam 102 or the auxiliary beam 103 is grounded for output, and the other electrode surface of the piezoelectric sheet is connected to the positive electrode for output. The present invention adopts the main beam 102 and the auxiliary beam 103 arranged perpendicular to each other. The bending vibration mode of the main beam and the bending vibration mode of the auxiliary beam are orthogonally distributed in space. This orthogonal vibration mode design decouples the vibration excitation mode of the auxiliary beam and the magnetic field excitation mode of the main beam, thereby effectively avoiding mutual interference between the modes and improving the energy harvesting efficiency.

[0029] In the specific embodiment of the present application, the middle part of the auxiliary beam 103 is fixedly connected to the end of the main beam 102. One side of the largest surface of the main beam 102 is arranged vertically, and one side of the largest surface of the auxiliary beam 103 is arranged horizontally. The short side direction of the auxiliary beam 103 is parallel to the long side direction of the main beam. In the specific embodiment of the present application, one end of the main beam 102 is fixed to the fixed structure 106 by a fixing bolt 104, and the fixed structure can be a building column or a beam-column structure. Orthogonal beams perpendicular to both the main beam 102 and the auxiliary beam 103 are fixed at the ends of the main beam 102 and the auxiliary beam 103. The orthogonal beams are thin plate structures, and piezoelectric sheets are also attached to the largest surfaces of the orthogonal beams.

[0030] Mass blocks 105 are fixedly arranged at both ends of the auxiliary beam 103, and the mass blocks are fastened to the ends of the auxiliary beam.

[0031] The piezoelectric sheet material includes, but is not limited to, lead zirconate titanate piezoelectric ceramics, bismuth scandate-lead titanate piezoelectric ceramics, barium titanate piezoelectric ceramics, potassium sodium niobate piezoelectric ceramics, as well as lead magnesium niobate-lead titanate piezoelectric single crystals, lead zinc niobate-lead titanate piezoelectric single crystals, piezoelectric fiber composites and other materials.

[0032] The main beam, auxiliary beam, fixed structure, and fixing bolts include, but are not limited to, materials such as stainless steel, aluminum alloy, cast iron, and brass.

[0033] The mass block includes, but is not limited to, materials such as neodymium iron boron magnets, samarium cobalt magnets, ferrite magnets, aluminum nickel cobalt magnets, and chromium cobalt magnets.

[0034] In the specific embodiment of the present application, the polarization direction of the piezoelectric sheet is along the thickness direction of the piezoelectric sheet, and its longitudinal expansion and vibration mode is utilized, or its shear vibration mode is utilized along the longitudinal direction.

[0035] In an embodiment, an assembly schematic diagram of the orthogonal cantilever beam magnetoelectric conversion device provided by the present invention is as Figure 1 shown. Piezoelectric sheets 101 are attached to the maximum surface ends of the main beam 102 and the auxiliary beam 103. The middle of the auxiliary beam 103 is connected to the end of the main beam 102, and the magnet mass block 105 is fastened to the end of the auxiliary beam 103. The tail of the main beam 102 is fixed to the fixed structure 106 by fixing bolts 104.

[0036] A structural schematic diagram of the orthogonal cantilever beam magnetoelectric conversion device provided by this embodiment is as Figure 2 shown, where 201 is the first electrode surface, 202 is the second electrode surface, 203 is the third electrode surface, 204 is the ground plane, and the polarization direction of the piezoelectric sheet is indicated by the arrow. 201 is the first electrode surface, 202 is the second electrode surface, and 203 is the third electrode surface, all of which are connected to the positive electrode, and 204 is the electrode surface grounded.

[0037] When the orthogonal cantilever beam magnetoelectric conversion device is subjected to magnetic field or vibration excitation, it will generate a vibration mode as Figure 3 shown, transfer the force received to the piezoelectric sheet 101, causing it to elongate or shorten in the longitudinal direction, and generating charges on the third electrode surface 203 and the ground plane 204.

[0038] When the orthogonal cantilever beam magnetoelectric conversion device is subjected to magnetic field or vibration excitation, it will generate a vibration mode as Figure 4 shown, generating charges on the first electrode surface 201, the second electrode surface 202, and the ground plane 204. When vibration excitation and magnetic field excitation appear simultaneously in the surrounding environment, such as Figure 3 and Figure 4 the vibration modes will appear simultaneously, generating charges on the first electrode surface 201, the second electrode surface 202, the third electrode surface 203, and the ground plane 204.

[0039] Utilizing the orthogonal decoupled vibration modes as shown in Figure 3 and Figure 4 , there will be no mutual interference in the electrical signals between the first electrode surface 201, the second electrode surface 202, and the third electrode surface 203, achieving the hybrid energy harvesting of magnetic fields and vibrations. Relying on the direct piezoelectric effect of the piezoelectric sheet, the voltage signal generated on the surface of the piezoelectric sheet is proportional to the magnitude of the external excitation.

[0040] The orthogonal cantilever beam magnetoelectric conversion device provided by this application can expand the number of end sub-beams according to different environmental requirements. Under three-dimensional energy excitation, the electrode surfaces and ground surfaces of each piezoelectric sheet can independently generate charges, achieving synchronous harvesting of energy in three-dimensional directions.

[0041] In order to adapt to different external environmental conditions, the orthogonal cantilever beam magnetoelectric conversion device can expand the number of end sub-beams.

[0042] Taking three-dimensional energy excitation as an example, when subjected to three-dimensional energy excitation, the schematic diagram of the three-dimensional energy harvesting structure is as shown in Figure 5 . When the orthogonal cantilever beam magnetoelectric conversion device is subjected to three-dimensional external excitations 1, 2, and 3, the electrode surfaces and ground surfaces of each piezoelectric sheet can generate non-interfering charges to harvest energy in three-dimensional directions. By analogy, the orthogonal cantilever beam design method can harvest energy in more directions.

[0043] In the present invention, the piezoelectric sheets are arranged in multiple places, which can separately harvest the energy of magnetic fields and vibrations, facilitating the access of the subsequent energy harvesting management circuit; the polarization directions of the two parts of piezoelectric sheets can be opposite or the same, and two circuit connection methods of electrical parallel connection with a larger current or electrical series connection with a larger voltage can be selected according to actual requirements, increasing the flexibility of the application of the magnetoelectric conversion device; the two parts of piezoelectric sheets are located on the orthogonal structure, which can harvest the vibration energy of two frequencies, further broadening the application range of the magnetoelectric conversion device.

[0044] The energy harvesting performance of this energy harvester in vibrations and magnetic fields will be described in detail in the following two implementation cases.

[0045] Embodiment 1 In this embodiment, a test environment for vibration field energy harvesting testing is established. The test platform consists of a signal generator, a power amplifier, a vibration table, a vibration sensor, a charge amplifier, an oscilloscope, a rheostat, and an energy harvester sample. First, the output electrical signal of the power amplifier is set through the signal generator. The vibration frequencies of devices such as transformers in the smart grid are at the target frequency and acceleration. Through the signal generator, the frequencies before and after the target frequency are swept to find the resonant frequency of the secondary beam of the magnetic-force-electric coupling energy harvester based on the orthogonal vibration mode. Then, the power amplifier drives the vibration table to work. A vibration sensor is placed on the surface of the vibration table, and the sensor is connected to the charge amplifier. The signal of the charge amplifier is connected to the oscilloscope, and the real-time acceleration output by the vibration table is obtained through the relationship between the acceleration and the sensor voltage. The energy harvester is clamped at the top of the fixed structure by fixing bolts, and the fixed structure is rigidly connected to the vibration table. The positive and negative electrodes of the piezoelectric sheet are connected to the wires through conductive silver paste, and the other end of the wire is connected to the oscilloscope. Thus, the frequency and amplitude information of the electrical signal generated by the energy harvester in the vibration field can be obtained from the oscilloscope. Finally, with the acceleration unchanged, the peak-to-peak output voltage of the energy harvester at different frequencies is tested, and the impedance and output power density of the energy harvester are tested with the rheostat at the resonant frequency.

[0046] Starting from the initial input frequency, the peak-to-peak output voltage of the energy harvester is tested every 1 Hz to first determine the approximate range interval of the resonant frequency. Then, between two adjacent frequencies where the resonant frequency may appear, it is measured again every 0.1 Hz. Finally, the frequency at which the maximum output voltage appears is taken as the resonant frequency. By organizing the above data, the relationship between the peak-to-peak voltage and frequency of the magnetic-force-electric coupling energy harvester with orthogonal vibration modes under external vibration excitation can be formed. Then, with the resonant frequency and acceleration magnitude unchanged, a rheostat is connected in parallel with the oscilloscope in the circuit. The parallel resistance is changed from 90 kΩ to 160 kΩ, and the peak-to-peak voltage corresponding to each resistance is measured. Combining with the volume of the piezoelectric sheet, the power density at each resistance can be calculated. Finally, the resistance corresponding to the maximum power density is taken as the impedance. By organizing the above data, the relationship between the output power and impedance of the magnetic-force-electric coupling energy harvester with orthogonal vibration modes under external vibration excitation can be formed.

[0047] Embodiment 2 In this embodiment, a test environment for magnetic field energy harvesting testing is established. The test platform consists of a signal generator, a power amplifier, Helmholtz coils, an oscilloscope, a resistor, a variable resistor box, and an energy harvester sample. First, the output electrical signal of the power amplifier is adjusted through the signal generator. By conducting research, the leakage magnetic field frequency and magnetic field intensity of equipment such as transformers in the power grid are obtained. Through the signal generator, frequency sweeping is performed on the frequencies before and after the leakage magnetic frequency to find the resonance frequency of the main beam of the magnetic-force-electricity coupled energy harvester based on orthogonal vibration modes. Then, the power amplifier supplies power to the Helmholtz coils to operate, and the energy harvester sample is placed inside the Helmholtz coils. The energy harvester is the same as in the vibration energy test, clamped at the end of the fixed structure with fixing bolts. The fixed structure is rigidly connected to the platform inside the Helmholtz coils. The positive and negative electrodes of the piezoelectric sheet are connected to wires with conductive silver paste, and the other end of the wire is connected to the oscilloscope to monitor in real time information such as the electrical signal frequency and amplitude generated by the energy harvester in the magnetic field. A small-value resistor is connected in series with the Helmholtz coils, and the oscilloscope is connected in parallel with the small-value resistor. The voltage across the resistor is measured with the oscilloscope. According to the operating parameters of the Helmholtz coils, the relationship between the voltage across the small-value resistor and the magnetic field intensity is calculated, and the magnetic field intensity is adjusted to the magnetic field intensity of common equipment such as variable resistor boxes in the power grid. Finally, with the magnetic field intensity unchanged, the peak-to-peak voltage that the sample can output in the magnetic field at different frequencies is tested, and the impedance of the energy harvester is tested with the variable resistor box at the frequency of the maximum output peak-to-peak voltage, and the output power density is calculated.

[0048] Starting from the initial magnetic field frequency, the peak-to-peak output voltage of the sample is tested every 1 Hz to initially obtain approximately between which two frequencies the resonance frequency lies. Then, detailed measurements are made every 0.1 Hz between these two adjacent frequencies, and finally, the resonance frequency at which the maximum output voltage appears is obtained. The measured data is sorted out to form the relationship between the peak-to-peak voltage and frequency of the magnetic-force-electricity coupled energy harvester based on orthogonal vibration modes under external magnetic field excitation. Continuing to keep the resonance frequency and magnetic field intensity unchanged, a variable resistor box is connected in parallel in the circuit. The parallel resistance is changed from 80 kΩ to 220 kΩ, and the peak-to-peak voltage of the magnetic field energy harvesting corresponding to each resistance is measured. Further combined with the volume of the piezoelectric sheet, the power density at each resistance is calculated to obtain the impedance of the sample. After sorting out the data, the relationship between the output power and impedance of the magnetic-force-electricity coupled energy harvester based on orthogonal vibration modes under external magnetic field excitation can be formed.

[0049] In summary, it can be seen that the design concept of the magnetic-force-electricity coupled energy harvester based on orthogonal vibration modes proposed in the present invention combines the weak boundary clamping effect, reduces interference between the main beam and the secondary beam by using two mutually orthogonal vibration mode states, realizes the respective energy harvesting, effectively solves the coupling problem of the rigid connection between the special-shaped beam and the main beam, and ensures the efficient energy harvesting in both modes.

[0050] Finally, it should be noted that the above embodiments are only for detailed description of the technical idea of the present invention, rather than a limitation thereof. Those skilled in the art can understand that: within the spirit and scope of the present invention and the appended claims, various changes, modifications and substitutions are possible, and these all belong to the protection scope of this application. The scope of protection required by the present invention shall be subject to the scope defined by the claims.

Claims

1. An orthogonal cantilever beam magnetoelectric conversion device, characterized in that: The invention comprises a main beam (102) fixed at one end and a sub-beam (103) vertically fixed to the other end of the main beam (102). The main beam (102) and the sub-beam (103) are both thin plate structures. The sides of the main beam (102) and the sub-beam (103) are both provided with piezoelectric sheets. Two electrode layers are provided on the largest surface of the piezoelectric sheet. The electrode surface on one side of the piezoelectric sheet in contact with the main beam (102) or the sub-beam (103) is grounded for output, and the electrode surface on the other side of the piezoelectric sheet is connected to the positive electrode for output.

2. The orthogonal cantilever beam magnetoelectric conversion device according to claim 1, characterized in that: The middle part of the auxiliary beam (103) is fixedly connected to the end of the main beam (102), the largest surface side of the main beam (102) is vertically arranged, the largest surface side of the auxiliary beam (103) is horizontally arranged, and the short side direction of the auxiliary beam (103) is parallel to the long side direction of the main beam.

3. The orthogonal cantilever beam magnetoelectric conversion device according to claim 1, characterized in that: One end of the main beam (102) is fixed to the fixed structure (106) by means of a fixing bolt (104).

4. The orthogonal cantilever beam magnetoelectric conversion device according to claim 1, characterized in that: An orthogonal beam vertically arranged to the main beam (102) and the auxiliary beam (103) is fixed at the ends of the main beam (102) and the auxiliary beam (103). The orthogonal beam is a thin plate structure, and a piezoelectric sheet is also attached to the largest surface of the orthogonal beam.

5. The orthogonal cantilever beam magnetoelectric conversion device according to claim 1, characterized in that: Mass blocks (105) are fixedly arranged at both ends of the secondary beam (103), and the polarization direction of the piezoelectric sheet is along the thickness direction of the piezoelectric sheet.

6. The orthogonal cantilever beam magnetoelectric conversion device according to claim 1, characterized in that: A plurality of expandable sub-beams (103) can be arranged on the main beam (102) in the three-dimensional space, respectively corresponding to different directions in the three-dimensional space, so as to realize the collection of three-dimensional energy.

7. An energy collection method based on the orthogonal cantilever beam magnetoelectric conversion device according to claim 1, characterized in that: The following steps are involved: The main beam and the auxiliary beam are fixedly connected vertically and piezoelectric sheets are attached to the largest surfaces of the main beam and the auxiliary beam. The electrode surface on one side of the piezoelectric sheet that contacts the main beam or the auxiliary beam is grounded for output, and the electrode surface on the other side of the piezoelectric sheet is connected to the positive electrode for output. The orthogonal cantilever beam magnetoelectric conversion device generates vibration when subjected to a magnetic field or vibration excitation, thereby obtaining corresponding energy.

8. The energy collection method of the orthogonal cantilever beam magnetoelectric conversion device according to claim 7, characterized in that: Under the condition of constant acceleration, the peak-to-peak value of the energy harvester output voltage at different frequencies is tested, and the impedance and output power density of the energy harvester are tested at the resonant frequency with the help of a variable resistance box; The peak-to-peak voltage value under the corresponding resistance is measured by the experimental method. Combined with the volume of the piezoelectric film, the power density under each resistance can be calculated. Finally, the resistance corresponding to the maximum power density is used as the impedance, and the relationship between the output power and impedance of the magnetic-mechanical-electric coupling energy harvester based on orthogonal vibration modes under external vibration excitation can be obtained.

9. The energy collection method of the orthogonal cantilever beam magnetoelectric conversion device according to claim 7, characterized in that: Under the condition of constant magnetic field strength, the peak-to-peak value of the voltage output by the orthogonal cantilever beam magnetoelectric converter in magnetic fields of different frequencies is tested, and the impedance of the energy harvester is tested using a variable resistance box at the frequency of the maximum output voltage peak-to-peak value, and the output power density is calculated; The resonant frequency at which the maximum output voltage occurs is obtained by an experimental method, and the relationship between the peak-to-peak voltage and frequency of the orthogonal-mode magneto-mechanical-electric coupling energy harvester under external magnetic field excitation is formed.

10. The energy collection method of the orthogonal cantilever beam magnetoelectric conversion device according to claim 9, characterized in that: Combined with the volume of the piezoelectric film, the power density under each resistance is calculated, and the impedance of the orthogonal cantilever beam magnetoelectric conversion device is obtained. Finally, the relationship between the output power and impedance of the magneto-mechanical-electric coupling energy harvester based on orthogonal vibration mode under external excitation of the magnetic field can be obtained.

Images