Protecting Magnetic Field Disturbance by Adding Steel Shield based on Magnetic Field Change Phenomenon

Among the various types of sensors that detect the rotation angle in automobile parts, the Hall Sensor (HALL Sensor) is a widely used technology in sensor applications. The rotation angle of a Hall sensor is currently accurate because it detects a precise angle within an error range of less than 1%. However, since the Hall sensor may be affected by the disturbance of the external magnet, the accuracy of the sensor is degraded due to the interaction between the magnetic field of the internal magnet and the magnetic field of the external magnet. To improve this, we try to find a shielding method that shields the external magnetic field using magnetic materials and a method that improves the measurement stability of the Hall sensor by analyzing the magnetic field phenomenon that passes through the magnetic material. In this paper, we present our experimental results to digitize the degree of external magnetic field shielding to secure stability and to maintain the accuracy of the sensor (the disturbance characteristics of the external magnet) below 5%.