Two-Dimensional Characterization and Simplified Simulation Procedure for Tunnel Magnetoresistive Angle Sensors

In this paper we describe a method and a measurement setup that is suitable for the rapid characterization and simple modeling of magnetic sensor components for automotive electronics. We apply the two-dimensional characteristic diagram method for modern angle sensors. This method is already known for incremental speed sensors [1]-[4]. Data acquisition for the characteristic diagram is performed via an automated scanning procedure with a cross coil setup. We improve the usable range of the cross coil setup by using an optimized coil shape. Furthermore, the two-dimensional excitation with magnetic field components H
_x
and H
_y
is adapted to the field rotation of angle sensors. Two examples with recently launched sensor products based on the promising tunnel magnetoresistance (TMR) effect show how this method can be used to effectively support sensor development including the design of the moving permanent magnet, the mechanical design and tolerance tests.