Magnetic structure for detecting a relative motion between the magnetic structure and a magnetic field sensor

摘要

The structure (1) has permanent magnets (15, 16) i.e. bar magnets, arranged along a predetermined line and separated at predetermined distance from each other. The permanent magnets are magnetized in direction of the line. Adjacent permanent magnets have opposite direction of magnetization. The distance fulfills specific conditions with a pair of quantities that designate length of shortest and longest permanent magnets according to a measured value. The structure is arranged between the permanent magnets. An independent claim is also included for a position encoder comprising a magnetic field sensor.