Research on Optimal Design Method of Active Compensation Coil for MEMS Electronic Compass Strong Magnetic Interference

Abstract

In practical applications, the electronic compass composed of a three-axis magnetometer and a three-axis accelerometer often saturates the output of the magnetometer due to the strong magnetic field interference of the carrier itself, causing the electronic compass to fail to work normally. In order to overcome the above influence, based on the analysis of the carrier's own interference magnetic field characteristics, an active compensation method for a three-axis external coil is proposed. Through finite element simulation, the coil position, radius, number of turns and other structural parameters were optimized, and COMSOL software was used for simulation verification and optimization. The simulation results show that the compensation coil can effectively compensate the strong magnetic interference of the carrier and improve the adaptability of the electronic compass working environment.