Inductive absolute position sensor
US11262219B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 4, 2020 |
| Grant date | Mar 1, 2022 |
| Priority date | — |
| Expiry date | Oct 3, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/2046
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An inductive absolute position sensor has a scale with planar conducting features on a pattern repeating every spatial period TC along a measuring path and a reading head with planar windings: multipolar sine and cosine sense windings of spatial period TF=TC/M, M an integer, a unipolar first drive winding surrounding the sense windings and a multipolar second drive winding of spatial period TC/N along the measuring path, with N=M±1. An electronic circuit makes a first mode measurement using the first drive winding and a second mode measurement using the second drive winding. The absolute position in a range TC is computed from both modes' measurements. The sensor may be as compact as the incremental sensor it replaces, as the scale pattern and second drive winding needed for making it absolute do not need extra space.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.