CN114337370A - Magnetoelectric transducer for dynamically adjusting frequency response characteristic - Google Patents
Magnetoelectric transducer for dynamically adjusting frequency response characteristic Download PDFInfo
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- CN114337370A CN114337370A CN202111520720.7A CN202111520720A CN114337370A CN 114337370 A CN114337370 A CN 114337370A CN 202111520720 A CN202111520720 A CN 202111520720A CN 114337370 A CN114337370 A CN 114337370A
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Abstract
The invention discloses a magnetoelectric transducer for dynamically adjusting frequency response characteristics, which generates resonance and alternating charges under the magnetic induction action of alternating magnetic fields of a permanent magnet and a coil through a composite magnetoelectric inner core, the alternating charges are amplified by a resonance power amplifier, and a signal spectrogram is generated on a signal analyzer. In order to control and adjust the resonant frequency of the composite magnetoelectric core, one or more magnetic clamping jaws on the clamping device are clamped with the composite magnetoelectric core, and the stress boundary condition of the composite magnetoelectric core is changed by dynamically adjusting the position and the number of the magnetic clamping jaws, so that the natural frequency of the composite magnetoelectric core is changed, and the resonant frequency lower than the natural frequency is obtained, thereby realizing the dynamic adjustment of the frequency response characteristic of the composite magnetoelectric core, and finally obtaining the magnetoelectric transducer capable of dynamically adjusting the frequency response characteristic.
Description
Technical Field
The invention relates to the technical field of magnetoelectric transduction, in particular to a magnetoelectric transduction device for dynamically adjusting frequency response characteristics.
Background
With the rapid development of the intelligent internet of things technology and the electronic information technology, the development and application of polarized materials and devices are receiving wide attention. In the prior art, a very-low-frequency long-wave antenna adopted by liquid, gas and solid cross-medium communication can reach kilometer level, has huge size, high cost and poor maneuverability, cannot be used for receiving and transmitting, and how to reduce the size of the long-wave antenna to meter level brings subversive development to cross-medium communication equipment technology in the fields of resource exploration, emergency rescue, biomedical treatment and the like.
The magnetoelectric long-wave antenna can realize the transmission and the reception of low-frequency electromagnetic waves through a magnetic-acoustic-electric coupling effect, and the realization basis is a piezoelectric/magnetostrictive magnetoelectric heterogeneous composite material. The miniaturized magnetoelectric antenna based on the magnetoelectric heterostructure generates electromagnetic radiation through a physical oscillation electric dipole and a magnetic moment, has the device size of only one ten thousandth of that of the traditional antenna, and has low energy consumption, high radiation efficiency and wide application prospect. The most common magnetoelectric composite material in the prior art is strip-shaped, and has the problems that the electromechanical resonance frequency is limited by the size of the material and is often as high as ten thousand hertz (Hz) or even hundred thousand hertz (Hz), and the application of the magnetoelectric composite material is limited by higher resonance frequency.
The conventional frequency modulation method for a magnetoelectric sensor is described in document 1, and the size gradient adjustment of a magnetoelectric material (Tunable magnetic resonance of dimensional gradient composites [ J ]. Applied physics letters, 2012, 100 (21): 212901-1-212901-5.), if the adjustment method is adopted, the size of the magnetoelectric material theoretically needs to reach 10 meters. See document 2, material symmetry adjustment (Giant resistive electromagnetic effect in bi-layered Metglas/Pb (Zr, Ti) O3 composites [ J ]. Journal of Applied Physics, 2012, 112 (10): 104101.), this method does not enable dynamically controllable adjustment of the frequency response of a single magnetoelectric transducer. Aiming at the problems in the prior art, how to reset the structure of the composite magnetoelectric core is to change the natural frequency of the composite magnetoelectric core by changing the stress boundary condition of the composite magnetoelectric core, thereby realizing the dynamic adjustment of the frequency response characteristic of the composite magnetoelectric core, finally obtaining different resonant frequencies lower than the natural frequency, obtaining a magnetoelectric transducer capable of dynamically adjusting the frequency response characteristic, or being an effective way.
Disclosure of Invention
The invention aims to provide a magnetoelectric transducer for dynamically adjusting frequency response characteristics aiming at the defects of the prior art, which adopts a composite magnetoelectric inner core formed by compounding a strip-shaped magnetostrictive material and a block-shaped piezoelectric material, wherein the composite magnetoelectric inner core generates resonance under the magnetic induction action of an alternating magnetic field of a permanent magnet and a coil to generate alternating charges, the alternating charges are amplified by a resonance power amplifier, and a signal spectrogram is generated on a signal analyzer, so that the composite magnetoelectric inner core converts magnetic energy into electric energy under the magnetic field environment to obtain the inherent resonance frequency of the composite magnetoelectric inner core. In order to control and adjust the resonant frequency of the composite magnetoelectric core, one or a plurality of magnetic clamping jaws on the clamping device are clamped with the magnetostrictive material of the composite magnetoelectric core, and the stress boundary condition of the composite magnetoelectric core is changed by dynamically adjusting the position of the magnetic clamping jaws for clamping the magnetostrictive material and the number of the magnetic clamping jaws for clamping the magnetostrictive material, so that the natural frequency of the composite magnetoelectric core is changed to obtain the resonant frequency lower than the natural frequency, thereby realizing the dynamic adjustment of the frequency response characteristic of the composite magnetoelectric core and finally obtaining the magnetoelectric transducer capable of dynamically adjusting the frequency response characteristic.
The invention can be used for converting magnetic energy into electric energy and used as a magnetoelectric sensor or a magnetoelectric antenna; and the device can also be used for related devices for converting electric energy into magnetic energy. The invention has the advantage that the resonance frequency response point of the magnetoelectric transducer can be controllably adjusted, thereby widening the application range of the magnetoelectric transducer.
The specific technical scheme for realizing the purpose of the invention is as follows:
a magnetoelectric transducer for dynamically adjusting frequency response characteristics is characterized by comprising a composite magnetoelectric inner core, a base frame, a permanent magnet, a coil, a power module, a resonance power amplifier, a signal analyzer, a clamping device and an electric cabinet;
the composite magnetoelectric inner core is composed of a strip-shaped magnetostrictive material and a block-shaped piezoelectric material, and the piezoelectric material is adhered to the middle part of the strip-shaped magnetostrictive material;
the base frame is in a rectangular block shape, the middle part of the base frame is provided with a track seat, and the two ends of the base frame are sequentially and symmetrically provided with a supporting seat, a coil seat and a permanent magnet seat;
the clamping device consists of a track, a magnetic clamping jaw and an adjusting screw, and the bottom of the magnetic clamping jaw is provided with an internal thread; a plurality of adjusting screw seats are intermittently distributed on the track and are sequentially arranged on the adjusting screw seats of the track; the magnetic clamping jaw is a plurality of pieces, the magnetic clamping jaw slides in the track, and an internal thread at the bottom of the magnetic clamping jaw is meshed with one adjusting screw;
the composite magnetoelectric inner core is placed on a supporting seat of the base frame through two ends of a magnetostrictive material, the coil is arranged on a coil seat of the base frame, the coil surrounds the outer side of the composite magnetoelectric inner core, the two permanent magnets are respectively arranged on the permanent magnet seats at the two ends of the base frame, and the centers of the two permanent magnets are superposed with the axis of the magnetostrictive material;
the track of the clamping device is arranged on a track seat of the base frame, and one or more magnetic clamping jaws on the clamping device are clamped with the magnetostrictive material of the composite magnetoelectric inner core;
the power supply module is electrically connected with the coil;
the electric cabinet is electrically connected with the magnetic clamping jaw of the clamping device;
the signal input end of the resonance power amplifier is connected with the magnetostrictive material of the composite magnetoelectric inner core, and the signal output end of the resonance power amplifier is connected with a data line of a signal analyzer.
The magnetostrictive material is Terfenol-D (Tb-Dy-Fe alloy) or Metglas (Fe-Si-B-C amorphous alloy) ferrite magnetostrictive material.
The piezoelectric material is piezoelectric single crystal, piezoelectric ceramic, piezoelectric film, piezoelectric polymer or piezoelectric composite.
The permanent magnets are ferrite, and the magnetic fields of the permanent magnets arranged at the two ends of the base frame are symmetrically arranged by taking magnetostrictive materials as centers.
The coil is a solenoid coil or a Helmholtz coil.
The signal analyzer is a spectrum analyzer or a dynamic signal analyzer.
The invention has the following characteristics:
the composite magnetoelectric core is formed by compounding a strip-shaped magnetostrictive material and a block-shaped piezoelectric material, has a magnetoelectric effect, and can generate alternating charges under an alternating magnetic field.
The two permanent magnets are respectively arranged on the permanent magnet seats at the two ends of the base frame, the centers of the two permanent magnets are superposed with the axis of the magnetostrictive material, and the optimal direct-current bias magnetic field is obtained by adjusting the axial distance of the two permanent magnets.
The power supply module is electrically connected with the coil and provides an alternating electric signal for the coil, the coil generates an alternating magnetic field through an electromagnetic effect, and the composite magnetoelectric inner core generates alternating charges through a magnetoelectric effect under the action of the alternating magnetic field; the alternating charges are amplified by the resonance power amplifier, and a signal spectrogram is generated on a signal analyzer, so that the composite magnetoelectric inner core converts magnetic energy into electric energy in a magnetic field environment, and the resonance frequency of the inherent composite magnetoelectric inner core is obtained and analyzed and represented.
In order to reduce the resonant frequency of the composite magnetoelectric core, one or more magnetic clamping jaws on a clamping device are adopted to clamp the magnetostrictive material of the composite magnetoelectric core, and the stress boundary condition of the composite magnetoelectric core is changed by dynamically adjusting the position of the magnetic clamping jaws for clamping the magnetostrictive material and the number of the magnetic clamping jaws for clamping the magnetostrictive material, so that the natural frequency of the composite magnetoelectric core is changed, the dynamic adjustment of the frequency response characteristic of the composite magnetoelectric core 1 is realized, and different resonant frequencies lower than the natural frequency are finally obtained.
The electromagnetic chuck is arranged on the magnetic clamping jaws, the electric cabinet respectively controls the working states of the electromagnetic chucks on the magnetic clamping jaws, and the electromagnetic chucks are clamped when power is on and loosened when power is off.
The dynamic range of the frequency response characteristic of the composite magnetoelectric inner core is controlled by setting the position of the magnetic clamping jaws for clamping the magnetostrictive material and the number of the magnetic clamping jaws for clamping the magnetostrictive material, and one or a plurality of magnetic clamping jaws are adjusted by adjusting screws to slide in a short distance between screw seats in a track so as to finely adjust the composite magnetoelectric inner core in the dynamic range of the frequency response characteristic.
The natural frequency of the composite magnetoelectric inner core is changed by changing the stress boundary condition of the composite magnetoelectric inner core, so that the frequency response characteristic of the composite magnetoelectric inner core is dynamically adjustable, different resonant frequencies lower than the natural frequency of the composite magnetoelectric inner core are obtained, the magnetoelectric transducer with the dynamically-regulated frequency response characteristic is put into practice, and a good foundation is established for widening the application range of the magnetoelectric transducer.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural diagram of the clamping device of the present invention.
Detailed Description
Referring to fig. 1 and 2, the invention comprises a composite magnetoelectric core 1, a pedestal 2, a permanent magnet 3, a coil 4, a power module 5, a resonance power amplifier 6, a signal analyzer 7, a clamping device 8 and an electric cabinet 9;
the composite magnetoelectric inner core 1 is composed of a strip-shaped magnetostrictive material 12 and a block-shaped piezoelectric material 11, and the piezoelectric material 11 is bonded in the middle of the strip-shaped magnetostrictive material 12;
the base frame 2 is in a rectangular block shape, the middle part of the base frame is provided with a track seat 21, and the two ends of the base frame are sequentially and symmetrically provided with a supporting seat 22, a coil seat 23 and a permanent magnet seat 24;
the clamping device 8 consists of a track 81, a magnetic clamping jaw 82 and an adjusting screw 83, and the bottom of the magnetic clamping jaw 82 is provided with an internal thread 84; a plurality of adjusting screw seats 811 are intermittently distributed on the track 81, and the adjusting screws 83 are arranged on the adjusting screw seats 811 of the track 81 in sequence; the magnetic clamping jaw 82 is in several pieces, the magnetic clamping jaw 82 slides in the track 81, and the internal thread 84 at the bottom of the magnetic clamping jaw 82 is engaged with one of the adjusting screws 83.
Referring to fig. 1 and 2, the composite magnetoelectric core 1 is placed on a supporting seat 22 of the base frame 2 through two ends of the magnetostrictive material 12, the coil 4 is arranged on a coil seat 23 of the base frame 2, the coil 4 surrounds the outer side of the composite magnetoelectric core 1, the two permanent magnets 3 are respectively arranged on permanent magnet seats 24 at two ends of the base frame 2, and the centers of the two permanent magnets 3 coincide with the axis of the magnetostrictive material 12;
the track 81 of the clamping device 8 is arranged on the track seat 21 of the base frame 2, and one magnetic clamping jaw 82 or a plurality of magnetic clamping jaws 82 on the clamping device 8 are clamped with the magnetostrictive material 12 of the composite magnetoelectric core 1;
the power supply module 5 is electrically connected with the coil 4;
the electric control box 9 is electrically connected with the magnetic clamping jaw 82 of the clamping device 8;
the signal input end of the resonance power amplifier 6 is connected with the magnetostrictive material 12 of the composite magnetoelectric core 1, and the signal output end of the resonance power amplifier 6 is connected with the data wire of the signal analyzer 7.
The magnetostrictive material 12 is Terfenol-D (Tb-Dy-Fe alloy) or Metglas (Fe-Si-B-C amorphous alloy) ferrite magnetostrictive material.
The piezoelectric material 11 is a piezoelectric single crystal, piezoelectric ceramic, a piezoelectric film, a piezoelectric polymer or a piezoelectric composite.
The permanent magnets 3 are ferrite, and the magnetic fields of the permanent magnets 3 arranged at the two ends of the base frame 2 are symmetrically arranged by taking the magnetostrictive material 12 as the center.
The coil 4 is a solenoid coil or a Helmholtz coil.
The signal analyzer 7 is a spectrum analyzer or a dynamic signal analyzer.
Examples
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, firstly, the composite magnetoelectric core 1 is formed by compounding a strip-shaped magnetostrictive material 12 and a block-shaped piezoelectric material 11, the piezoelectric material 11 is adhered to the middle of the strip-shaped magnetostrictive material 12, the magnetostrictive material 12 is made of a ferrite magnetostrictive material, the piezoelectric material 11 is made of piezoelectric ceramics, and the prepared composite magnetoelectric core 1 has a magnetoelectric effect and can generate alternating charges under an alternating magnetic field.
Referring to fig. 1, the permanent magnets 3 are two pieces, and are respectively disposed on the permanent magnet seats 24 at the two ends of the base frame 2, the centers of the two pieces of permanent magnets 3 coincide with the axis of the magnetostrictive material 12, the two pieces of permanent magnets 3 are symmetrically disposed with the magnetostrictive material 12 as the center, and the optimal dc bias magnetic field is obtained by adjusting the axial distance between the two pieces of permanent magnets 3.
Referring to fig. 1, a power module 5 is electrically connected with a coil 4, the coil 4 is a solenoid coil, the power module 5 provides an alternating electrical signal for the coil 4, the coil 4 generates an alternating magnetic field through an electromagnetic effect, and the composite magnetoelectric core 1 generates alternating charges through a magnetoelectric effect under the action of the alternating magnetic field; the alternating charges are amplified by the resonance power amplifier 6, a signal wave spectrum is generated on the signal analyzer 7, and the signal analyzer 7 selects a spectrum analyzer, so that the composite magnetoelectric core 1 converts magnetic energy into electric energy in a magnetic field environment, and the inherent resonance frequency of the composite magnetoelectric core 1 is obtained and analyzed and characterized.
Referring to fig. 1 and 2, in order to reduce the resonant frequency of the composite magnetoelectric core 1, two magnetic clamping jaws 82 on a clamping device 8 are clamped with two ends of a magnetostrictive material 12 of the composite magnetoelectric core 1, the relative positions of the two magnetic clamping jaws 82 and the composite magnetoelectric core 1 are selected, the magnetic clamping jaws 82 can slide in a track 81 by meshing an adjusting screw 83 with an internal thread 84 at the bottom of the magnetic clamping jaws 82, so that the relative positions of the magnetic clamping jaws 82 and the magnetostrictive material 12 are accurately adjusted, the stress boundary condition of the composite magnetoelectric core 1 is changed, the natural frequency of the composite magnetoelectric core 1 is changed, the dynamic adjustment of the frequency response characteristic of the composite magnetoelectric core 1 is realized, different resonant frequencies lower than the natural frequency are finally obtained, and the resonant frequency is reduced from tens of kHz to hundreds of Hz.
Referring to fig. 1 and 2, the magnetic clamping jaws 82 of the invention are provided with electromagnetic chucks, the electric cabinet 9 respectively controls the working states of the electromagnetic chucks on the magnetic clamping jaws 82, the electromagnetic chucks are clamped electrically and loosened in a power-off manner, and the number of the magnetic clamping jaws 82 clamped on the composite magnetoelectric core 1 is dynamically adjusted through the electric cabinet 9, so that the frequency response characteristic of the magnetoelectric material is dynamically and controllably adjusted.
Referring to fig. 1 and 2, the dynamic range of the frequency response characteristic of the composite magnetoelectric core 1 is controlled by changing the position of the magnetic clamping jaws 82 for clamping the magnetostrictive material 12 and the number of the magnetic clamping jaws 82 for clamping the magnetostrictive material 12, and the sliding of the magnetic clamping jaws 82 in a short distance between the adjusting screw seats 811 of the track 81 is adjusted by the adjusting screws 83, so that the composite magnetoelectric core 1 is finely adjusted in the dynamic range of the frequency response characteristic.
Referring to fig. 1 and 2, the number of the magnetic clamping jaws 82 for holding the magnetostrictive material 12 according to the present invention is one, two or more, and the magnetic clamping jaws 82 for holding the magnetostrictive material 12 according to the present invention can be disposed at any position of the track 81.
The above description of the disclosed embodiments is provided to enable any person skilled in the art to understand the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. A magnetoelectric transducer for dynamically adjusting frequency response characteristics is characterized by comprising a composite magnetoelectric inner core (1), a base frame (2), a permanent magnet (3), a coil (4), a power supply module (5), a resonance power amplifier (6), a signal analyzer (7), a clamping device (8) and an electric cabinet (9);
the composite magnetoelectric inner core (1) is composed of a strip-shaped magnetostrictive material (12) and a block-shaped piezoelectric material (11), and the piezoelectric material (11) is bonded in the middle of the strip-shaped magnetostrictive material (12);
the base frame (2) is in a rectangular block shape, the middle part of the base frame is provided with a track seat (21), and the two ends of the base frame are sequentially and symmetrically provided with a supporting seat (22), a coil seat (23) and a permanent magnet seat (24);
the clamping device (8) is composed of a track (81), a magnetic clamping jaw (82) and an adjusting screw (83), and the bottom of the magnetic clamping jaw (82) is provided with an internal thread (84); a plurality of adjusting screw seats (811) are intermittently distributed on the track (81), and the adjusting screws (83) are arranged on the adjusting screw seats (811) of the track (81) in sequence; the magnetic clamping jaws (82) are several, the magnetic clamping jaws (82) slide in the track (81), and an internal thread (84) at the bottom of the magnetic clamping jaws (82) is meshed with one adjusting screw (83);
the composite magnetoelectric core (1) is placed on a supporting seat (22) of the base frame (2) through two ends of a magnetostrictive material (12), the coil (4) is arranged on a coil seat (23) of the base frame (2), the coil (4) is enclosed on the outer side of the composite magnetoelectric core (1), the two permanent magnets (3) are respectively arranged on permanent magnet seats (24) at two ends of the base frame (2), and the centers of the two permanent magnets (3) are superposed with the axis of the magnetostrictive material (12);
a track (81) of the clamping device (8) is arranged on a track seat (21) of the base frame (2), and one magnetic clamping jaw (82) or a plurality of magnetic clamping jaws (82) on the clamping device (8) are clamped with the magnetostrictive material (12) of the composite magnetoelectric core (1);
the power supply module (5) is electrically connected with the coil (4);
the electric control box (9) is electrically connected with the magnetic clamping jaw (82) of the clamping device (8);
the signal input end of the resonance power amplifier (6) is connected with the magnetostrictive material (12) of the composite magnetoelectric core (1), and the signal output end of the resonance power amplifier (6) is connected with the data line of the signal analyzer (7).
2. The magnetoelectric transducer device for dynamically adjusting frequency response according to claim 1, wherein the magnetostrictive material (12) is a ferrite magnetostrictive material of Terfenol-D i.e. Tb-Dy-Fe alloy or Metglas i.e. FeSiB-C amorphous alloy.
3. The magnetoelectric transducer device for dynamically adjusting frequency response characteristics according to claim 1, wherein said magnetoelectric transducer device is characterized in that
The piezoelectric material (11) is a piezoelectric single crystal, piezoelectric ceramic, piezoelectric film, piezoelectric polymer or piezoelectric composite.
4. The magnetoelectric transducer device for dynamically adjusting frequency response characteristics according to claim 1, wherein said magnetoelectric transducer device is characterized in that
The permanent magnets (3) are ferrite, and the magnetic fields of the permanent magnets (3) arranged at the two ends of the base frame (2) are symmetrically arranged by taking the magnetostrictive material (12) as the center.
5. The magnetoelectric transducer device for dynamically adjusting frequency response characteristics according to claim 1, wherein said magnetoelectric transducer device is characterized in that
The coil (4) is a solenoid coil or a Helmholtz coil.
6. The magnetoelectric transducer device for dynamically adjusting frequency response characteristics according to claim 1, wherein the signal analyzer (7) is a spectrum analyzer or a dynamic signal analyzer.
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| CN202111520720.7A CN114337370B (en) | 2021-12-14 | 2021-12-14 | Magneto-electric transduction device capable of dynamically adjusting frequency response characteristic |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102255555A (en) * | 2011-07-11 | 2011-11-23 | 南京航空航天大学 | Permanent magnet dual-coil-driven giant magnetostrictive actuator and working method thereof |
| US20130193693A1 (en) * | 2012-02-01 | 2013-08-01 | Virginia Tech Intellectual Properties, Inc. | Multimodal vibration harvester combining inductive and magnetostrictive mechanisms |
| CN106556803A (en) * | 2015-09-24 | 2017-04-05 | 南京理工大学 | A kind of mode of resonance Magnetic Sensor |
| US20170269037A1 (en) * | 2015-11-13 | 2017-09-21 | Huazhong University Of Science And Technology | Test method and sensor using magnetostrictively induced guided wave based on open magnetic circuit |
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2021
- 2021-12-14 CN CN202111520720.7A patent/CN114337370B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102255555A (en) * | 2011-07-11 | 2011-11-23 | 南京航空航天大学 | Permanent magnet dual-coil-driven giant magnetostrictive actuator and working method thereof |
| US20130193693A1 (en) * | 2012-02-01 | 2013-08-01 | Virginia Tech Intellectual Properties, Inc. | Multimodal vibration harvester combining inductive and magnetostrictive mechanisms |
| CN106556803A (en) * | 2015-09-24 | 2017-04-05 | 南京理工大学 | A kind of mode of resonance Magnetic Sensor |
| US20170269037A1 (en) * | 2015-11-13 | 2017-09-21 | Huazhong University Of Science And Technology | Test method and sensor using magnetostrictively induced guided wave based on open magnetic circuit |
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| 李平;黄娴;文玉梅;: "偏置电压对磁致伸缩/压电层合换能结构磁电性能影响", 物理学报 * |
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