# US 2019/0170494 A1 · Inductive position measuring device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0170494 A1 - Document ID: US20190170494A1 - Status: Published application - Kind: A1 - Application number: 16/200,162 - Filed: 2018-11-26 - Published: 2019-06-06 - Earliest claimed: 2017-12-06 - Assignees: Dr. Johannes Heidenhain GmbH - Applicants: DR. JOHANNES HEIDENHAIN GmbH - Inventors: Marc Oliver TIEMANN; Alexander FRANK; Martin HEUMANN; Daniel AUER; Oliver SELL - Web page: https://patentgrep.com/patent/US20190170494A1 ## CPC - G01B 7/003: {for measuring position, not involving coordinate determination (coordinate measuring G01B7/004)} - G01B 7/14: for measuring distance or clearance between spaced objects or spaced apertures (G01B7/30 takes precedence) - G01D 5/2046: {by a movable ferromagnetic element, e.g. a core} - G02B 26/10: Scanning systems - G01D 2205/771: Toothed profiles - G01D 2205/90: Two-dimensional encoders, i.e. having one or two codes extending in two directions - G01B: MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS - G01D: MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract An inductive position-measuring device includes a scanning element and a graduation element, rotatable about an axis relative to the scanning element. The scanning element has exciter lead(s), a first receiver track, including receiver line(s), extending according to a first periodic pattern having a first period along a first direction, and a second receiver track, including receiver line(s). The graduation element includes a graduation track, extending in the circumferential direction and including a graduation period. An electromagnetic field generated by the exciter lead(s) with the aid of the graduation track is able to be modulated, so that an angular position is detectable with the aid of the receiver line of the first receiver track, and a position of the graduation element in the first direction relative to the scanning element is detectable with the aid of the receiver line of the second receiver track. ## Claims ### Claim 1 An inductive position-measuring device, comprising: a scanning element; and a graduation element rotatable about an axis relative to the scanning element; wherein the scanning element includes: at least one exciter lead; a first receiver track including at least one receiver line that extends according to a first periodic pattern having a first period along a first direction; and a second receiver track including at least one receiver line; wherein the graduation element includes a graduation track that extends in a circumferential direction in relation to the axis and has a graduation period along the circumferential direction; and wherein the position-measuring device is adapted to modulate an electromagnetic field generated with the aid of the graduation track by the at least one exciter lead to detect an angular position of the graduation element relative to the scanning element with the aid of the receiver line of the first receiver track and to detect a position of the graduation element in the first direction relative to the scanning element with the aid of the receiver line of the second receiver track. ### Claim 2 (depends on 1) The inductive position-measuring device according to claim 1, wherein the first receiver track and/or the second receiver track includes at least two receiver lines. ### Claim 3 (depends on 1) The inductive position-measuring device according to claim 1, wherein the following relationship is satisfied: 1.5>[first period:graduation period]>0.75. ### Claim 4 (depends on 1) The inductive position-measuring device according to claim 1, wherein the first receiver track includes at least one receiver line that extends along the first direction across a length that is at least three times greater than the first period. ### Claim 5 (depends on 1) The inductive position-measuring device according to claim 1, wherein the receiver line of the second receiver track is arranged according to a second periodic pattern having a second period that greater than the graduation period of the graduation track. ### Claim 6 (depends on 1) The inductive position-measuring device according to claim 1, wherein the receiver line of the second receiver track is arranged according to a second periodic pattern having a second period that is greater than the first period. ### Claim 7 (depends on 1) The inductive position-measuring device according to claim 1, wherein the first receiver track is arranged at a radial offset relative to the second receiver track in relation to the axis. ### Claim 8 (depends on 5) The inductive position-measuring device according to claim 5, wherein the first receiver track is arranged at a smaller radial distance from the axis than the second receiver track. ### Claim 9 (depends on 1) The inductive position-measuring device according to claim 1, wherein the graduation element has a curved lateral surface on which the graduation track is disposed. ### Claim 10 (depends on 1) The inductive position-measuring device according to claim 1, wherein the first receiver track and/or the second receiver track is arranged on a flat plane. ### Claim 11 (depends on 9) The inductive position-measuring device according to claim 9, wherein the first receiver track and/or the second receiver track is arranged on a curved plane, a radius of curvature of the curved plane differing from a radius of curvature of the curved lateral surface. ### Claim 12 (depends on 1) The inductive position-measuring device according to claim 1, wherein the graduation track includes alternating webs and gaps. ### Claim 13 (depends on 1) The inductive position-measuring device according to claim 1, wherein the graduation element has a circular outer contour having a diameter, the second receiver track includes has at least one receiver line that extends along the first direction across a length, and the length is greater than one-half of the diameter. ### Claim 14 (depends on 1) The inductive position-measuring device according to claim 1, wherein the graduation element has a circular outer contour having a diameter, the first receiver track includes at least one receiver line that extends along the first direction across a length, and the length is greater than the diameter. ### Claim 15 (depends on 1) The inductive position-measuring device according to claim 1, wherein the graduation element has a circular outer contour having a diameter, the receiver line of the second receiver track is arranged according to a second periodic pattern having a second period, and the second period is greater than the diameter. ### Claim 16 (depends on 1) The inductive position-measuring device according to claim 1, wherein a first signal having a first amplitude amount generatable with the aid of the receiver line of the first receiver track, a second signal having a second amplitude amount is generatable with the aid of the receiver line of the second receiver track, and the position-measuring device is adapted to determine a distance in a second direction between the scanning element and the graduation element based of the first amplitude amount and the second amplitude amount.