Development of a Current Sensor Based on a Magnetic Fluid Magnetic Bridge

忠津 孝, 笹田 一郎, T. Tadatsu, I. Sasada
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引用次数: 1

Abstract

Demands for dc current sensors have recently been increasing. We developed a hysteresis-free current sensor based on a magnetic bridge by using magnetic fluid as a core material, which is super-paramagnetic and has no magnetic hysteresis. In the experiment, the core size was 42 mm in outer diameter, 28 mm in inner diameter, and 3.5 mm in height. The sensor became saturated at ±200 A input current, but no hysteresis was observed throughout the whole range of measurement. In a measurement range of ±20 A, the sensitivity was 0.603 mV/A, the linearity error was ±0.7 %, and the temperature error characteristics were -0.2 %/°C from 0 °C to 30 °C. This hysteresis-free current sensor would be useful in energy-efficient power systems to enable accurate current monitoring, especially in dc power-distribution systems.
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基于磁流体磁桥的电流传感器的研制
近年来,对直流电流传感器的需求不断增加。本文以超顺磁性、无磁滞的磁流体为核心材料,研制了一种基于磁桥的无磁滞电流传感器。实验中,岩心尺寸为外径42 mm,内径28 mm,高3.5 mm。传感器在±200 A输入电流时饱和,但在整个测量范围内未观察到磁滞。在±20 a的测量范围内,灵敏度为0.603 mV/ a,线性误差为±0.7%,温度误差特性为- 0.2% /°C。这种无迟滞电流传感器可用于节能电力系统,以实现准确的电流监测,特别是在直流配电系统中。
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