ROTATIONAL ANGLE MAGNETIC SENSOR

摘要

Rotational angle sensor comprising a two coil assembly, wherein the two coils are arranged coaxially and separately with respect to their shared coil axis by an axial interspacing; a 2-axis magnetic sensor within said interspacing; and an electronic circuit arranged such that, when in operation, a magnetic field with alternating time periods of opposite field directions and same magnetic magnitude is generated between the two coils; wherein the two coil assembly and the magnetic sensor are rotatably arranged in respect of each other, in particular the electronic circuit comprises a differentiator of the magnetic sensor signals received between alternating time periods of opposite field directions, in particular the alternating time periods being consecutive alternating time periods. Method of operation thereof comprising applying a magnetic field with alternating time periods of opposite field directions and same magnetic magnitude and differentiating the magnetic sensor signal received between alternating time periods.