Magnetoelectric Current Sensor Research Articles

Magnetoelectric Sensor Operating in d15 Thickness-Shear Mode for High-Frequency Current Detection.

For the application of high-frequency current detection in power systems, such as very fast transient current, lightning current, partial discharge pulse current, etc., current sensors with a quick response are indispensable. Here, we propose a high-frequency magnetoelectric current sensor, which consists of a PZT piezoelectric ceramic and Metglas amorphous alloy. The proposed sensor is designed to work under d15 thickness-shear mode, with the resonant frequency around 1.029 MHz. Furthermore, the proposed sensor is fabricated as a high-frequency magnetoelectric current sensor. A comparative experiment is carried out between the tunnel magnetoresistance sensor and the magnetoelectric sensor, in the aspect of high-frequency current detection up to 3 MHz. Our experimental results demonstrate that the d15 thickness-shear mode magnetoelectric sensor has great potential for high-frequency current detection in smart grids.

Contactless sensor for real-time monitoring of lithium battery external short circuit based on magnetoelectric elastomer composites

The frequent accident due to external short circuit of lithium-ion batteries in electric vehicles have prompted people to develop sensing technology to achieve early warning. However, the limited space and high temperature in highly integrated lithium-ion battery packs present significant challenges for current sensors to achieve external short circuit monitoring with high structural flexibility and heat resistance. In this study, a piezoelectric elastomer is designed and blended with magnetostrictive ferric tetroxide to prepare the LMPE/Fe3O4 magnetoelectric current sensor (LMPE/Fe3O4 MCS). The amorphous structure and low modulus of the piezoelectric elastomer enable the LMPE/Fe3O4 MCS to exhibit large deformability over 50 % elongation, and the non-ferroelectric LMPE and ferric tetroxide with high Curie temperature offer the LMPE/Fe3O4 MCS with high heat resistance over 150 °C. Meanwhile, the excellent interfacial interaction between the piezoelectric elastomer and the ferric tetroxide eliminates stress transfer loss between the interface, presenting outstanding magnetoelectric response and excellent linearity (>0.99) with current sensitivity of 5.975 mV A−1. The LMPE/Fe3O4 MCS can achieve real-time monitoring and early warning for external vibration and short circuit during the charging and discharging process of lithium batteries, which shows promising solutions for the safety improvement of electric vehicles.

Current Detection and Energy Harvesting Integrated Magnetoelectric Sensor with Flexibility and Heat Resistance Based on Polylactide/VB2 Composites and FeCoV (Adv. Mater. Interfaces 9/2022)

Magnetoelectric Current Sensor In article number 2102048, Na Yi, Xiaoran Hu, Wei Lin, and co-workers propose a novel magnetoelectric current sensor (MCS) based on polylactide/VB2 composites and FeCoV. The MCS with high flexibility, heat resistance, and efficient conversion from magnetic field to electric power is presented in the cover.

Current Detection and Energy Harvesting Integrated Magnetoelectric Sensor with Flexibility and Heat Resistance Based on Polylactide/VB2 Composites and FeCoV

AbstractThe highly miniaturized and integrated electronic devices have demanded contactless current sensors with scale miniaturization, structure flexibility, self‐powering and heat resistance. Herein, a novel magnetoelectric current sensor (MCS) based on polylactide/VB2 composites and FeCoV is prepared using in‐situ coating and poling‐free methods. The use of polylactide/VB2 composite makes the MCS self‐powered and heat resistant, and the use of FeCoV makes the MCS highly flexible. The in‐situ coating and poling‐free methods endow the polylactide/VB2 composite and FeCoV good interfacial coupling. As a result, the MCS possesses good linearity over 0.999 and high sensitivity of 0.64 mV/A to the external current, even at a high temperature of 120 °C. Besides, the MCS presents high durability after 200 000 cycles. The MCS with mini size, self‐powering, heat resistance, high flexibility and durability has great potential in safety monitoring of electronic devices fields.

Split-core magnetoelectric current sensor and wireless current measurement application

This paper proposed a split-core magnetoelectric current sensor consisting of a symmetric Terfenol-D/PZT/Terfenol-D composite, three magnetic core, a pair of permanent magnets and a packaging shell. The Terfenol-D/PZT/Terfenol-D element and three magnetic cores are connected in series to form a closed magnetic ring. In practical application, the sensor can be opened and closed during installation. For detecting the 50 Hz current, the detection sensitivity reaches 52.79 mV/A with R2 = 0.9988 in range of 10A to 1000A. In order to realize the wireless and self-powered measurement of current, this paper proposed a wireless current measurement system combining the split-core current sensor, a RMS detection module, a 4G-RTU module, a current transformer energy harvester and a monitoring platform. Within the allowable error range, the proposed measurement system can realize the wireless measurement of 50 Hz current. These results show that the proposed split-core magnetoelectric current sensor is expected to provide a new idea about current on-line monitoring for Internet of Things in Power Systems, which is of great significance and application.

Self-Biased Bidomain LiNbO3/Ni/Metglas Magnetoelectric Current Sensor.

The article is devoted to the theoretical and experimental study of a magnetoelectric (ME) current sensor based on a gradient structure. It is known that the use of gradient structures in magnetostrictive-piezoelectric composites makes it possible to create a self-biased structure by replacing an external magnetic field with an internal one, which significantly reduces the weight, power consumption and dimensions of the device. Current sensors based on a gradient bidomain structure LiNbO3 (LN)/Ni/Metglas with the following layer thicknesses: lithium niobate—500 μm, nickel—10 μm, Metglas—29 μm, operate on a linear section of the working characteristic and do not require the bias magnetic field. The main characteristics of a contactless ME current sensor: its current range measures up to 10 A, it has a sensitivity of 0.9 V/A, its current consumption is not more than 2.5 mA, and its linearity is maintained to an accuracy of 99.8%. Some additional advantages of a bidomain lithium niobate-based current sensor are the increased sensitivity of the device due to the use of the bending mode in the electromechanical resonance region and the absence of a lead component in the device.

Schematic modeling of functional units of a magnetoelectric current sensor

The article is devoted to circuit simulation of functional units of a magnetoelectric current sensor. The magnetoelectric current sensor is designed to measure the current in electrical circuits of direct or alternating current in electrical engineering. The advantages of the developed magnetoelectric current sensors over existing analogs are higher sensitivity, lower power consumption, wide dynamic range of the output voltage, and better linearity of the output characteristics. In the course of the simulation, a model of the OA MCP6024-E/ST microcircuit from Microchip Technology Inc. was used, which is used as a signal amplifier for a magnetoelectric sensing element in a current sensor. Simulation of the signal generation unit, peak detector and linear amplifier was carried out. Circuitry solutions were proposed to improve the parameters of existing current sensors. Solutions have been found to ensure the temperature stability of the sensor. The developed magnetoelectric current sensors can be manufactured using integral technology and become a significant competitor to the traditional Hall effect sensors.

Possibilities of the application magnetoelectric current sensor for the power supply in transport systems

The paper presents the review of the magnetoelectric current sensors. The possibility of output voltage measurement of the sensor in the function of DC magnetic field is also presented.

The effect of oxygen vacancy on magnetism of geometrically frustrated triangular lattice CuFeO2: Ab initio study

The geometric, magnetic and electronic structures of oxygen-deficient CuFeO2 crystal have been studied with the GGA plus on-site repulsion U method. In CuFeO2, oxygen vacancy has the influences on two aspects. One is the decrease of lattice parameters, another is the valence change of Fe and Cu ion induced by the change of ionic charge number. In addition, when the oxygen vacancy appear in CuFeO2, the stability of collinear antiferromagnetic structure is enhanced. Furthermore, the electronic structure analysis suggest that there may be a powerful magnetoelectric coupling effect in oxygen-deficient CuFeO2 crystal, since the crystal is a zero gap conductor in ferromagnetic state while having a small gap in antiferromagnetic state. This unique property exhibits potential application prospect for magnetoelectric current sensor.

Self-biased magnetoelectric current sensor based on SrFe12O19/FeCuNbSiB/PZT composite

This paper presents a packaged current sensor based on a SrFe12O19/FeCuNbSiB/PZT self-biased magnetoelectric (ME) cantilever. The hard magnetic material of the SrFe12O19 ribbon with a large coercive field provides a huge internal magnetic field to bias the magnetostrictive FeCuNbSiB(Fe73.5Cu1Nb3Si13.5B9) layers, which can increase the magnetic moment reorientation of FeCuNbSiB layers. Consequently, by coupling the vortex magnetic field around a current-carrying cable, the proposed SrFe12O19/FeCuNbSiB/PZT sensor has a large output voltage and electric current sensitivity without additional DC bias magnetic field. Experimental results demonstrate that the presented sensor has a higher sensitivity of 198.91 mV/A at 50 Hz and the induced output voltage shows a good linear relationship to the applied 50 Hz current. Also, the SrFe12O19/FeCuNbSiB/PZT sensor can distinguish small step changes of ˜0.01 A current. These results provide a significant advancement toward promising application of the trilayer self-biased ME laminate for power-line electric monitoring.

Magnetoelectric current sensor: miniaturization and perspective

One of the main tasks of microelectronics is the miniaturization of devices with the keeping of previous functions and technical characteristics. In this paper, we present a magnetoelectric current sensor using a microprocessor. Compared with the previously presented magnetoelectric current sensor, we reduced the overall dimensions by almost 2 times and saved technical characteristics. Integration of the microprocessor opens up wide prospects for the application of the sensor in various industries, for example in robotics.

Magnetoelectric Current Sensors.

In this work a magnetoelectric (ME) current sensor design based on a magnetoelectric effect is presented and discussed. The resonant and non-resonant type of ME current sensors are considered. Theoretical calculations of the ME current sensors by the equivalent circuit method were conducted. The application of different sensors using the new effects, for example, the ME effect, is made possible with the development of new ME composites. A large number of studies conducted in the field of new composites, allowed us to obtain a high magnetostrictive-piezoelectric laminate sensitivity. An optimal ME structure composition was matched. The characterization of a non-resonant current sensor showed that in the operation range to 5 A, the sensor had a sensitivity of 0.34 V/A, non-linearity less than 1% and for a resonant current sensor in the same operation range, the sensitivity was of 0.53 V/A, non-linearity less than 0.5%.