Practical Considerations and Error Estimation in Hall Effect Current Sensors using 2D-FEMM

Hall based current sensors are widely used in AC and DC high current sensing. Current in busbar generates magnetic field which is directed to hall sensor using a surrounding magnetic core. This paper describes practical considerations while designing the core based current sensor and estimation of errors due to various factors. Effect of airgap, effect of Non-linear magnetic material, busbar and sensor displacement has been demonstrated. Effect of returning busbar in proximity impacts current measurement. Effect with various spacing and placement of returning busbar are presented. Comparison of analytical design and simulation results using 2D FEMM (Finite Element Method Magnetics) is presented.