Magnetic out-of-axis angle sensing principle

摘要

The present disclosure relates to a magnetic angle sensor module having first magnetic polewheel comprising a first number of poles and a second magnetic polewheel comprising a second number of poles greater than the first number. First and second magneto-resistive sensors are located around the first polewheel at a first angular position and a second angular position, respectively. The first and second magneto-resistive sensors collectively generate sensor signals corresponding to a measured angle of the first polewheel, while the third magneto-resistive sensor generates a third sensor signal corresponding to a measured angle of the second polewheel. A signal processor receives the first and third sensor signals and operates an algorithm that determines a position within a signal curve of the second polewheel from the first sensor signal and that determines an enhanced angle from the position within the signal curve and the third sensor signal.

主权项

1. A multi-sensor magnetic sensor module for angle measurement of a mechanical angle of rotation of a rotating device using a magnetic principle in an out-of-axis configuration, comprising:
a first magnetic polewheel comprising a plurality of sections, having alternating polarities, located within a ring structure that generates a magnetic field that varies as a function of a mechanical angle of the first magnetic polewheel; a first magneto-resistive sensor having a structure that generates a first sensor signal corresponding to a first measured angle of the first magnetic polewheel; and a second magneto-resistive sensor having a structure that concurrently generates a second sensor signal corresponding to a second measured angle of the first magnetic polewheel; wherein the first magneto-resistive sensor comprises a first rotational orientation with respect to a first radial direction of the first magnetic polewheel; wherein the second magneto-resistive sensor comprises a second rotational orientation with respect to a second, different radial direction of the first magnetic polewheel; and wherein an angle between the first rotational orientation and the second rotational orientation is dependent upon a number of the plurality of sections in the first magnetic polewheel.