Abstract
We present a novel high-accuracy rotary magnetic sensor system composed
of a two-track coded multi-pole magnet and a dual-spot multi-axes
magnetic sensor. The novelty is the measurement of two orthogonal
magnetic field components in each of the two sensing spots of the
sensor, one associated with each magnet track. As the two orthogonal
signals in each spot are naturally in quadrature, i.e. they represent a
sine and a cosine signal, the measurement principle is virtually
independent of the magnet pole size and pitch. We can therefore design a
magnet with much larger poles which in turn generate stronger magnetic
flux, allowing for an increased air gap between sensor and magnet. The
calibrated encoder system was characterized to deliver 13 bits of
absolute accuracy and 17 bits of resolution over the full 360° range.
Article ACCEPTED for publication in 2023 IEEE Sensors.