Patent ID: 9528856
Filing Date: 2016-12-27
CPC Classification: G01D

Claim Text:
1. An energy-self-sufficient multiturn rotary encoder configured for energy-self sufficiently detecting a number of completely passed 360° revolutions of an encoder shaft, which rotates about a rotational axis, wherein an excitation magnet is mounted in a rotationally fixed manner to the rotational axis, wherein the excitation magnet generates an external magnetic field, and also being configured for determining an absolute rotational angle indicating a fine-resolved position within one 360° revolution of the encoder shaft, wherein the multiturn rotary encoder comprises: a pulse sensor configured for generating energy from a remagnetization pulse, which is caused in the pulse sensor by a change of strength of the external magnetic field which is sufficiently large, wherein the change of the magnetic-field strength is caused by rotation of the excitation magnet; an evaluation unit; a magnetic-field sensor configured for detecting the strength of the external magnetic field and for generating a corresponding signal a signal value of which corresponds to the strength of the external magnetic field and is delivered to the evaluation unit, wherein, wherein a signal course is sectionalized for evaluation thereof into a plurality of quadrants; a revolution counter configured for storing the number of completely passed 360° revolutions of the encoder shaft; and a history memory adapted for storing a history of quadrant values; wherein the evaluation unit is operated, in order to determine the number of completely passed 360° revolutions of the encoder shaft, with energy obtained from the remagnetization pulse; wherein the evaluation unit is adapted to: derive from the delivered signal value one of the quadrants, in which the delivered signal value is located, and to deliver a corresponding quadrant value to the history memory while one of the remagnetization pulses occurs.