CN110333378B - A Magnetoelectric Laminated Material Current Sensing Device Based on Magnetic Convergence Effect - Google Patents
A Magnetoelectric Laminated Material Current Sensing Device Based on Magnetic Convergence Effect Download PDFInfo
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- CN110333378B CN110333378B CN201910469954.XA CN201910469954A CN110333378B CN 110333378 B CN110333378 B CN 110333378B CN 201910469954 A CN201910469954 A CN 201910469954A CN 110333378 B CN110333378 B CN 110333378B
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- 239000002648 laminated material Substances 0.000 title claims abstract description 54
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- 239000000463 material Substances 0.000 claims description 55
- 230000007246 mechanism Effects 0.000 claims description 8
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- 239000011230 binding agent Substances 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 230000005690 magnetoelectric effect Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
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- 238000010586 diagram Methods 0.000 description 2
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- 238000003475 lamination Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
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- 238000010168 coupling process Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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Abstract
本发明提供了一种基于磁汇聚效应的磁电层合材料电流传感装置，包括保护外壳、固定底座、位于所述固定底座上的磁汇聚子结构、位于所述磁汇聚子结构底部的永磁铁、分别位于所述磁汇聚子结构上方的质量块以及磁电层合材料、位于所述磁电层合材料下表面的载流导线。本发明通过以上设计解决了现有传感装置的灵敏度和线性度较低，传感装置结构复杂、难于安装，直流偏置磁场为固定值，难以调节，以及结构谐振频率不可调节的问题。本发明结构简单，可靠性高，将结构谐振频率调整到电流频率附近，获得更大的输出灵敏度，不仅使直流偏置磁场可调节，可满足不同磁电材料的最优偏置磁场，而且还使谐振频率可调节，满足测量不同频率电流都具有较大灵敏度。
The present invention provides a magnetoelectric laminate material current sensing device based on the magnetic convergence effect, comprising a protective casing, a fixed base, a magnetic convergence substructure on the fixed base, and a permanent magnet located at the bottom of the magnetic convergence substructure. Magnets, mass blocks located above the magnetic converging substructures, magnetoelectric laminates, and current-carrying wires located on the lower surface of the magnetoelectric laminates. Through the above design, the present invention solves the problems of low sensitivity and linearity of the existing sensing device, complex structure of the sensing device, difficult to install, fixed DC bias magnetic field, difficult to adjust, and unadjustable structural resonance frequency. The invention has the advantages of simple structure and high reliability, and the resonant frequency of the structure is adjusted to be close to the current frequency to obtain greater output sensitivity. The resonant frequency can be adjusted to meet the needs of measuring different frequency currents with greater sensitivity.
Description
Technical Field
The invention belongs to the field of current sensing, and particularly relates to a magnetoelectric laminated material current sensing device based on a magnetic convergence effect.
Background
The magnetoelectric material with the magnetoelectric effect can realize the mutual conversion of magnetic energy and electric energy, and is widely applied to the field of current sensing. The magnetoelectric effect is a phenomenon that a material generates a polarized electric field under the action of an external magnetic field or induces magnetization in the external electric field, the magnetoelectric laminated material consists of a ferromagnetic material with magnetostriction performance and a piezoelectric material with piezoelectric effect, and magnetoelectric conversion is realized through magnetic-mechanical-electric coupling. The principle is that when the magnetoelectric laminated material is placed in an external magnetic field, the magnetostrictive material which generates deformation transmits stress to the piezoelectric material, and voltage output is generated on the electrode of the piezoelectric material. Moreover, the current sensor based on the magnetoelectric effect converts magnetic energy into an electric signal and does not need additional external power supply. However, current sensors based on magnetoelectric laminates have major problems and drawbacks: (1) the sensitivity and linearity of the sensing device are low; (2) the structure is complex and difficult to install; (3) the bias magnetic field is a fixed value and is difficult to adjust; (4) the vibration frequency is not adjustable.
Disclosure of Invention
Aiming at the defects in the prior art, the magnetoelectric laminated material current sensing device based on the magnetic convergence effect solves the problems that the conventional sensing device is low in sensitivity and linearity, complex in structure, difficult to install, fixed in magnetic field, difficult to adjust and nonadjustable in vibration frequency.
In order to achieve the above purpose, the invention adopts the technical scheme that:
the scheme provides a magnetoelectric laminated material current sensing device based on a magnetic convergence effect, which comprises a protective shell and a current sensing mechanism, wherein the current sensing mechanism is positioned in the protective shell and penetrates through the protective shell.
The invention has the beneficial effects that: the invention adjusts the structural resonance frequency to be close to the current frequency so as to obtain higher output sensitivity, not only enables the direct-current bias magnetic field to be adjustable and can meet the optimal bias magnetic field of different magnetoelectric materials, but also enables the resonance frequency to be adjustable and can meet the requirement of measuring currents with different frequencies and have higher output sensitivity.
Further, current sensing mechanism includes unable adjustment base, is fixed in magnetism on the unable adjustment base gathers the substructure, is located the permanent magnet that the substructure bottom was gathered to the magnetism, is located magnetism gathers the magnetoelectric laminated material of substructure top, is located the quality piece of magnetoelectric laminated material top, and is located the current-carrying wire of magnetoelectric laminated material lower surface, wherein, current-carrying wire run through in protective housing.
The beneficial effects of the further scheme are as follows: the invention can effectively collect the alternating current magnetic field generated by the current-carrying conducting wire by adopting the magnetic collection effect, the direct current bias magnetic field can be adjusted by moving the movable magnetic core up and down, the optimal direct current bias magnetic field required by different magnetoelectric lamination is adapted, the optimal direct current bias magnetic field has larger output sensitivity, the structural resonance frequency can be adjusted, the current with different frequencies is adapted to the measurement, and the current with different frequencies measured by the current with different frequencies has larger output sensitivity.
Still further, the permanent magnet, the magnetic convergence substructure and the magnetoelectric laminate material form a direct current magnetic field magnetic circuit.
The beneficial effects of the further scheme are as follows: the permanent magnet provides a direct current bias magnetic field for the magnetoelectric laminated material, and the magnetoelectric laminated material needs to have a magnetic-electric coefficient strengthened under a certain direct current bias magnetic field, so that the movable magnetic core in the magnetic gathering substructure can be moved up and down to provide optimal direct current bias, and the sensitivity of the sensing device is effectively improved.
Still further, the magnetic gathering substructure and the magnetoelectric laminate material form a magnetic circuit.
The beneficial effects of the further scheme are as follows: the magnetic convergence sub structure and the high magnetic conductivity of the magnetostrictive material layer can converge magnetic lines of force to form a magnetic loop, and the magnetic induction intensity in the magnetoelectric laminated material is increased so as to improve the sensitivity of the current sensing device.
And furthermore, the magnetoelectric laminated material is in a cantilever shape, one end of the magnetoelectric laminated material is fixed on the fixed base, and the other end of the magnetoelectric laminated material is connected with the mass block through epoxy resin adhesive.
The beneficial effects of the further scheme are as follows: the invention can change the resonant frequency of the structure by adjusting the mass of the mass block or the distance from the mass block to the other end, and the sensitivity of the sensor is enhanced when the current frequency is the same as or close to the resonant frequency of the magnetoelectric laminated material, so that the magnetoelectric laminated material can be suitable for measuring currents with different frequencies and has higher sensitivity.
Still further, the magnetoelectric laminated material is formed by bonding a magnetostrictive material layer and a piezoelectric material layer through an adhesive, the piezoelectric material layer is positioned on the upper surface of the magnetostrictive material layer, and the current carrying lead is positioned on the lower surface of the magnetostrictive material layer.
The beneficial effects of the further scheme are as follows: the current-carrying lead is positioned in a magnetic loop consisting of the magnetostrictive material layer and the magnetic gathering structure, and the stress generated by the magnetostrictive material layer inducing the magnetic induction intensity of the current-carrying lead is transferred to the piezoelectric material layer through the binder, so that voltage output is generated on the piezoelectric material layer.
Still further, the magnetostrictive material layer and the piezoelectric material layer are both strip-shaped, and the length of the piezoelectric material layer is smaller than that of the magnetostrictive material layer.
The beneficial effects of the further scheme are as follows: the magnetostrictive material layer forms a cantilever beam structure, so that the resonant frequency is convenient to adjust, and the piezoelectric material layer is positioned above the position near the fixed end of the magnetostrictive material layer, so that the maximum strain stress of the magnetostrictive material layer can be received, and the sensitivity of the current sensor is effectively improved.
Still further, the magnetism assembles the substructure and is the H type, comprises the magnetic core, just it assembles the substructure and is provided with in with the removal magnetic core that unable adjustment base is parallel.
The beneficial effects of the further scheme are as follows: the invention provides the optimal direct current bias by arranging the movable magnetic core which can move up and down, thereby effectively improving the sensitivity of the sensor.
Drawings
Fig. 1 is a schematic structural diagram of a current sensing mechanism according to the present invention.
Fig. 2 is a schematic structural diagram of the protective housing of the present invention.
The magnetic field generator comprises a fixed base 1, a permanent magnet 2, a magnetic convergence substructure 3, a mass block 4, a current-carrying wire 5, a magnetic field telescopic material layer 6, a piezoelectric material layer 7, a movable magnetic core 8 and a protective shell 9.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
Examples
The invention discloses a magnetoelectric laminated material current sensing device based on a magnetic convergence effect, which adjusts the structural resonance frequency to be close to the current frequency to obtain higher output sensitivity, not only enables a direct current bias magnetic field to be adjustable and can meet the optimal bias magnetic field of different magnetoelectric materials, but also enables the resonance frequency to be adjustable and can meet the requirement of measuring currents with different frequencies and have higher sensitivity, and solves the problems that the existing sensing device has lower sensitivity and linearity, complicated structure, difficult installation, fixed magnetic field, difficult adjustment and nonadjustable vibration frequency.
As shown in fig. 1-2, a magnetoelectric laminated material current sensing device adopting a magnetic convergence structure includes a protective housing 9, and a current sensing mechanism located in the protective housing 9 and penetrating through the protective housing 9, the current sensing mechanism includes a fixed base 1, a magnetic convergence sub-structure 3 fixed on the fixed base 1, a permanent magnet 2 located at the bottom of the magnetic convergence sub-structure 3, a magnetoelectric laminated material located above the magnetic convergence sub-structure 3, a mass block 4 located above the magnetoelectric laminated material, and a current-carrying wire 5 located at the lower surface of the magnetoelectric laminated material, wherein the current-carrying wire 5 penetrates through the protective housing 9, the permanent magnet 2, the magnetic convergence sub-structure 3 and the laminated material form a magnetoelectric magnetic loop of a direct-current magnetic field, the magnetic convergence sub-structure 3 and the magnetoelectric laminated material form a magnetic loop, magnetoelectric laminated material is cantilever form, and its one end is fixed in on the unable adjustment base 1, its other end pass through the epoxy glue with the quality piece 4 is connected, magnetoelectric laminated material passes through the binder bonding by magnetostrictive material layer 6 and piezoelectric material layer 7 and constitutes, just piezoelectric material layer 7 is located the upper surface of magnetostrictive material layer 6, current carrying wire 5 is located the lower surface of magnetostrictive material layer 6, current carrying wire 5 is located the magnetostrictive material layer and gathers the magnetic circuit that substructure 3 constitutes with the magnetism, and the stress that current carrying wire 5 magnetic induction produced is sensed to the magnetostrictive material layer through the binder and is transmitted for piezoelectric material layer, produces voltage output on piezoelectric material layer, magnetostrictive material layer 6 with piezoelectric material layer 7 is rectangular form, just piezoelectric material layer 7's length is less than magnetostrictive material layer 6's length, the magnetic gathering substructure 3 is H-shaped and is composed of magnetic cores, and a movable magnetic core 8 parallel to the fixed base 1 is arranged in the magnetic gathering substructure 3.
In this embodiment, the magnetic gathering substructure 3 is composed of a magnetic core with high magnetic permeability, and can better gather an alternating current magnetic field generated by the current-carrying conducting wire. Meanwhile, the magnetic gathering substructure 3 can finely adjust the direct-current bias magnetic field provided by the permanent magnet 2 through the up-and-down movement of the movable magnetic core 8, so that a proper direct-current bias magnetic field is provided for the magnetoelectric laminated material. The magnetoelectric laminated material is formed by adhering a magnetostrictive material layer 6 and a piezoelectric material layer 7 together through an adhesive, one end of the magnetoelectric laminated material is fixed on the fixed base 1, and one section of the magnetoelectric laminated material is connected with the mass block 4, so that the magnetoelectric laminated material forms a cantilever beam, and the resonance frequency of the structure can be changed by adjusting the mass of the mass block 4. The sensing device forms a magnetic loop through the magnetic gathering sub-structure 3 and the magnetostrictive material layer 6, an alternating current magnetic field generated by the current carrying lead 5 is gathered through the magnetic gathering sub-structure 3, and voltage output is generated on the piezoelectric material layer 7 due to the magnetic-mechanical-electric coupling effect of the magnetoelectric laminated material, so that current measurement is completed.
In this embodiment, the permanent magnet 2 is disposed at the bottom of the magnetic convergence substructure 3, and forms a dc magnetic field magnetic loop with the magnetic convergence substructure 3 and the magnetostrictive material layer 6, and the permanent magnet 2 provides a dc bias magnetic field for the magnetoelectric laminated material, and since the magnetoelectric laminated material needs to have a strong magnetoelectric coefficient under a certain dc bias magnetic field, the movable magnetic core 8 can be moved up and down to provide an optimal dc bias, thereby improving the sensitivity of the sensor.
In this embodiment, magnetoelectric laminated material one end is fixed on unable adjustment base 1, and one section is connected with quality piece 4, can change the resonant frequency of structure through the quality of adjustment quality piece 4 or the distance to the other end, because when current frequency and magnetoelectric laminated material's resonant frequency is the same or when being close, sensing device's sensitivity also can strengthen, consequently can be applicable to and measure that different frequency current all has great sensitivity.
The invention can effectively collect the alternating current magnetic field generated by the current-carrying conducting wire by adopting the magnetic collection effect, the direct current bias magnetic field can be adjusted by moving the movable magnetic core up and down, the optimal direct current bias magnetic field required by different magnetoelectric lamination is adapted, the optimal direct current bias magnetic field has larger output sensitivity, the structural resonance frequency can be adjusted, the current with different frequencies is adapted to the measurement, and the current with different frequencies measured by the current with different frequencies has larger output sensitivity.
Claims (4)
1. A magnetoelectric laminated material current sensing device based on magnetic convergence effect is characterized by comprising a protective shell (9) and a current sensing mechanism which is positioned in the protective shell (9) and penetrates through the protective shell (9);
the current sensing mechanism comprises a fixed base (1), a magnetic gathering sub-structure (3) fixed on the fixed base (1), a permanent magnet (2) positioned at the bottom of the magnetic gathering sub-structure (3), a magnetoelectric laminated material positioned above the magnetic gathering sub-structure (3), a mass block (4) positioned above the magnetoelectric laminated material, and a current carrying wire (5) positioned on the lower surface of the magnetoelectric laminated material, wherein the current carrying wire (5) penetrates through the protective shell (9);
the magnetic gathering substructure (3) is H-shaped and consists of magnetic cores, and a movable magnetic core (8) parallel to the fixed base (1) is arranged in the magnetic gathering substructure (3);
the magnetoelectric laminated material is in a cantilever shape, one end of the magnetoelectric laminated material is fixed on the fixed base (1), and the other end of the magnetoelectric laminated material is connected with the mass block (4) through epoxy resin viscose;
the magnetoelectric laminated material is formed by bonding a magnetostrictive material layer (6) and a piezoelectric material layer (7) through an adhesive, the piezoelectric material layer (7) is positioned on the upper surface of the magnetostrictive material layer (6), and the current carrying lead (5) is positioned on the lower surface of the magnetostrictive material layer (6).
2. The magnetoelectric laminate material current sensing device based on the magnetic convergence effect according to claim 1, characterized in that the permanent magnet (2), the magnetic convergence substructure (3) and the magnetoelectric laminate material form one direct current magnetic field magnetic loop.
3. The magnetoelectric laminate material current sensing device based on the magnetic convergence effect according to claim 1, characterized in that the magnetic convergence substructure (3) forms one magnetic circuit with the magnetoelectric laminate material.
4. A magnetoelectric laminate material current sensing device based on the magnetic convergence effect according to claim 1, characterized in that the magnetostrictive material layer (6) and the piezoelectric material layer (7) are both elongated, and the length of the piezoelectric material layer (7) is smaller than the length of the magnetostrictive material layer (6).
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| CN112666377A (en) * | 2020-12-31 | 2021-04-16 | 国网河南省电力公司南阳供电公司 | Cubical switchboard three-phase generating line current measuring device |
| CN112881778B (en) * | 2021-01-19 | 2022-07-29 | 西南交通大学 | A fully enclosed switching type small current sensor |
| CN114019209B (en) * | 2022-01-05 | 2022-03-18 | 广东海洋大学 | A kind of electric polarization induction measurement method and system of magnetoelectric composite material |
| CN116184001B (en) * | 2023-04-24 | 2023-09-15 | 南方电网数字电网研究院有限公司 | Current sensor based on magneto-electric effect |
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