Inductive position sensor
US7652469B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 13, 2007 |
| Grant date | Jan 26, 2010 |
| Priority date | — |
| Expiry date | Apr 8, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/202
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An inductive position sensor has a spatially periodic scale with a series of conducting or permeable features of pitch T and a reading head with drive windings and sense windings, facing the scale with a spatial period 2T along the scale. The windings are each divided in two identical winding elements,having the same relative location within two identical winding element patterns having a center-to-center distance along the scale of NT+T/2, N being an integer, and connected so that the winding element polarities in each winding are either opposed for drive windings and the same for sense windings or the same for drive windings and opposed for sense windings. Thereby, direct couplings in both patterns cancel each other, while the spatially periodic signals coupled via the scale reinforce each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.