An energy-self-sufficient multiturn rotary encoder for detecting a number of complete 360° revolutions of an encoder shaft, rotating about a rotational axis and to which an excitation magnet is mounted in a rotationally fixed manner for generating an external magnetic field, as well as for determining an absolute rotational angle indicating a fine-resolved position within one 360° revolution of the encoder shaft, wherein the multiturn rotary encoder for energy-self sufficiently detecting the number of the complete 360° revolutions of the encoder shaft comprises: a, preferably one single, pulse sensor for generating energy from a remagnetization pulse, which is caused in the pulse sensor by a sufficiently large change of strength of the external magnetic field, wherein the change of the magnetic-field strength is caused by rotation of the excitation magnet; an evaluation unit which is only operated, in order to determine the number of the completely passed 360° revolutions of the encoder shaft, by energy obtained from the remagnetization pulses; a, preferably single one, magnetic-field sensor for detecting the strength of the external magnetic field and for generating a corresponding signal, the signal value of which corresponds to the strength of the external magnetic field and which can be delivered to the evaluation unit, wherein the signal ideally has a sinusoidal shape if the excitation magnet rotates continuously about the rotational axis together with the encoder shaft, and wherein the shape is sectionalized, in terms of an evaluation logic, into a plurality of quadrants (Q1 - Q4), which are preferably sized equally; a revolution counter for storing the number of completely passed 360° revolutions of the encoder shaft; characterized by a history memory in which, in operation, a history of quadrant values (Q1 - Q4) is stored; and wherein the evaluation unit is adapted to: derive one of the quadrants (Q1-Q4) from the delivered signal value (Px1, Px2), in which the delivered signal value (Px1, Px2) is located, and to deliver a corresponding quadrant value to the history memory while one of the remagnetization pulses occurs. a, preferably one single, pulse sensor for generating energy from a remagnetization pulse, which is caused in the pulse sensor by a sufficiently large change of strength of the external magnetic field, wherein the change of the magnetic-field strength is caused by rotation of the excitation magnet; an evaluation unit which is only operated, in order to determine the number of the completely passed 360° revolutions of the encoder shaft, by energy obtained from the remagnetization pulses; a, preferably single one, magnetic-field sensor for detecting the strength of the external magnetic field and for generating a corresponding signal, the signal value of which corresponds to the strength of the external magnetic field and which can be delivered to the evaluation unit, wherein the signal ideally has a sinusoidal shape if the excitation magnet rotates continuously about the rotational axis together with the encoder shaft, and wherein the shape is sectionalized, in terms of an evaluation logic, into a plurality of quadrants (Q1 - Q4), which are preferably sized equally; a revolution counter for storing the number of completely passed 360° revolutions of the encoder shaft; characterized by a history memory in which, in operation, a history of quadrant values (Q1 - Q4) is stored; and wherein the evaluation unit is adapted to: derive one of the quadrants (Q1-Q4) from the delivered signal value (Px1, Px2), in which the delivered signal value (Px1, Px2) is located, and to deliver a corresponding quadrant value to the history memory while one of the remagnetization pulses occurs. derive one of the quadrants (Q1-Q4) from the delivered signal value (Px1, Px2), in which the delivered signal value (Px1, Px2) is located, and to deliver a corresponding quadrant value to the history memory while one of the remagnetization pulses occurs.