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Based on piezoelectric effect, this paper presents a wide linearity range current sensor. The sensor contains two parts: an NdFeB/PZT/NdFeB composite (NPNC) and an annular magnetic core (MC) with an airgap to place the NPNC. When an ac current passes through a wire, an ac magnetic field converged by MC is applied along the thickness direction of the composite. The ac magnetic field exerts the attractive...
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