Current Measurement for Curved Conductor based on 3-D Coreless TMR Sensor Array

Abstract

Abstract Magnetic sensor arrays have been widely used in current measurement due to their advantages of small size, low power consumption, high sensitivity, wide bandwidth, and large dynamic range. However, researches in recent years all assume that the conductor is long-straight, while in actual engineering the conductor is usually curved. And the error introduced by curvature has not been searched until now. In this paper, a correction method based on circular 3D magnetic sensors array is proposed. The simulation results show theoretically that the method can greatly reduce the error. 3-D tunnel magnetoresistance (TMR) chip is selected as the magnetic sensors of the circular array in laboratory experiment, and the experiment errors can be reduced to around 1%. The simulation and experiment results verify that the correction method can improve the accuracy of the current measurement.