New method for anti-interference measuring current with TMR sensor array
Tunnel magnetoresistance(TMR)sensors is easily interfered by other magnetic fields when measuring current,resulting in measurement inaccuracy.To solve this problem,a three-sensor array design is proposed.By performing a spatially discrete Fourier transform on the magnetic field expression,transcendental equation group is established to solve the measurement current.The method is mathematically modeled,numerically simulated,finite element analysis and experimental analysis.Experimental results show that when the measurement current is 100 A and the interference current is 700 A,the maximum error of numerical simulation is 2.98 × 10 -15 ,and the maximum error of the finite element analysis array at various angles is less than 1％.In the range of 80 A,the maximum error of the experimental analysis is 2.02％.This verifies the effectiveness of the method.
current measurementtunnelmagneto-resistance(TMR)effectsensor array
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