Abstract
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.
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