Randomized trial demonstrates improved magnetic field measurement in asymmetric TMR sensor arrays, indicating new low-power methods.
With the advancement of power systems, high-precision magnetic field measurement plays a crucial role in grid monitoring and current inversion. Traditional contact-based current measurement methods involve complex installation, high power consumption, and weak interference resistance. Tunnel magnetoresistance (TMR) sensors offer high sensitivity and low power consumption but are susceptible to interference from nearby conductors and external magnetic fields in complex electromagnetic environments. This paper proposes an asymmetric array structure composed of two TMR sensors and constructs a magnetic field interference degree (MFID) model to determine the optimal arrangement angle (OAA). Simulation results demonstrate that the OAA layout significantly reduces magnetic field crosstalk errors, with maximum errors of only 0.96% and 0.58%. Given the direct correlation between magnetic field distribution and current magnitude, this method provides a novel magnetic field measurement approach and theoretical basis for low-power, high-precision current monitoring.
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Wang et al. (2026) studied this question.