A Low-Cost Current Sensor Based on Semi-Cylindrical Magnetostrictive Composite

Abstract

This paper presents the design, fabrication, and characterization of a compact current sensor based on magnetostrictive composites and resistance strain gauges. Firstly, we designed three kinds of current sensors with different structures, in which the shape of the giant magnetostrictive material (GMM) was cuboid, cylindrical, and semi-cylindrical. A set of finite element method (FEM) simulations were performed to qualitatively guide the design of three prototypes of the current sensor. It was determined that the most ideal shape of the GMM was semi-cylindrical. Secondly, Terfenol-D (TD) powder and epoxy resin were mixed to prepare magnetostrictive composites. In this paper, magnetostrictive composites with different particle size ranges and mass ratio were prepared and tested. The results show that the magnetostrictive composites had the best performance when the particle size range was 149–500 μm and the mass ratio of epoxy resin to TD powder was 1:5. Finally, this paper tested the performance of the sensor. The sensitivity, repeatability, and linear working range of the sensor reached 0.104 με/A, 2.51%, and 100–900 A respectively, when only 0.31 g of TD powder was employed. This means that current measurement with low cost, high sensitivity, and wide range was realized.

Voltage-controlled magnetic anisotropy-based spintronic devices for magnetic memory applications: Challenges and perspectives

“…Moreover, it is a very fragile and costly material. 182 Our group has, therefore, recently studied strain-assisted VCMA switching in mainstream materials like CoFeB. 178 We used a similar device structure to that of Drobitch et al 179 We performed macro-spin simulations to investigate the effect of strain and EB field on the WER of the device.…”

Design of a Fluxgate Weak Current Sensor with Anti-Low Frequency Interference Ability

“…In [10], a current sensor based on fluxgate technique is proposed for measuring nonlinear currents of arbitrary waveforms and linear currents from DC to several kilohertz. However, in practical measurements, this current sensor based on weak magnetic field detection is highly susceptible to external magnetic field interference [11][12][13], which is not considered Energies 2022, 15, 8489 2 of 14 in the above literature. In order to resist the external magnetic field interference, a lot of research has been conducted by domestic and foreign scholars, among which some references [14][15][16] proposed a circular array to improve measurement accuracy and reduce external interference, and experimentally proved the suppression effect of this method on the external magnetic field.…”