Two-dimensional inductive position sensing system
US9151639B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 10, 2014 |
| Grant date | Oct 6, 2015 |
| Priority date | — |
| Expiry date | Apr 6, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B7/003
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A two-dimensional inductive position sensing system uses four drive inductors arranged at the vertices of a parallelogram and a sensing inductor positioned within the parallelogram. The sensing inductor is movable within the parallelogram and relative to the drive inductors. A first oscillating current at a first frequency is supplied to a first pair of the drive inductors located at ends of a first diagonal of the parallelogram. A second oscillating current at a second frequency is supplied to a second pair of the drive inductors located at ends of a second diagonal of the parallelogram. As a result, the sensing inductor generates a first output voltage at the first frequency and a second output voltage at the second frequency. A processor determines a position of the sensing inductor relative to the drive inductors using the first output voltage and the second output voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.