A novel method for locating PM marker based on magnetic field reconstruction

PM marker along with an electrical system sensing its magnetic field is commonly used to determine the parts locations in industry. This paper proposes a novel method combining computation and experiment to improve the localization accuracy of the traditional PM marker approach. Based on the current-free property of the external space of the PM marker (modeled as an ideal dipole), the method computes (reconstructs) the magnetic field in the space by solving a Laplace´s equation with measured boundary conditions. Thus, the employ of reconstructed magnetic field with better quality improves the location estimation with higher accuracy. In the paper, the reconstruction and corresponding estimation algorithms are presented firstly. Its effect is then validated on a simulation model by a comparison with traditional PM marker approach, which shows that 80% error is eliminated at most.