Patent ID: 7719264

Claim:
A rotary transducer, comprising: a shaft; a carrier body, at least one excitation winding and at least one detector system provided on the carrier body, the excitation winding configured to conduct an excitation current to generate an electromagnetic field, the detector system configured to scan the electromagnetic field influenced by a code carrier; an excitation control device; and an evaluation device; wherein the shaft is rotatable relative to the carrier body and the code carrier is rotatably fixedly secured on the shaft to detect an angular position of the shaft; wherein the excitation control device is configured to operate the excitation winding selectively in two different operating modes, in a first operating mode, a first excitation current being generated, and, in a second operating mode, a second excitation current being generated; wherein electrical power consumption of the rotary transducer is lower in the second operating mode than in the first operating mode; wherein the excitation currents induce respective voltages in the detector system, the evaluation device configured to electronically process the voltages to generate angular position information; wherein the detector system includes a first detector winding and a second detector winding, the first detector winding configured to provide, within one rotation relative to the carrier body, a different number of signal periods than the second detector winding; wherein the evaluation device is configured to electronically process, in the second operating mode, the voltage induced in the first detector winding, the voltage induced in the second detector winding being negligible for the electronic processing; and wherein the evaluation device is configured to electronically process, in the first operating mode, the voltages induced in both the first detector winding and the second detector winding.