Patent ID: 11933643
Assignee: DR. JOHANNES HEIDENHAIN GMBH
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. An inductive angle measuring device, comprising:
a scale element including a first scale track having periodically-arranged first scale structures, a second scale track having periodically-arranged second scale structures, and a third scale track having periodically-arranged third scale structures disposed periodically, the first scale track and the third scale track including an equal first number of scale structures over a predetermined angle range, the second scale track including a second number of scale structures different from the first number, the first, second, and third scale tracks being arranged concentrically about an axis, the first scale track being arranged radially inwardly, the second scale track being arranged radially between the first scale track and the third scale track, the third scale track being arranged radially outwardly; and
a scanning element including an exciter line, a first receiver conductor adapted to scan the first scale track to generate a first signal having an angle-related first signal period, a second receiver conductor adapted to scan the second scale track to generate a second signal having an angle-related second signal period, and a third receiver conductor adapted to scan the third scale track to generate a third signal having an angle-related third signal period;
wherein the first signal period is equal to the third signal period and an overall signal is generatable from the first signal and the third signal and is combinable with the second signal to determine absolute angle position information; and
wherein the first scale track has a first radial extent, the third scale track has a third radial extent, the first radial extent being greater than the third radial extent.