Apparatus for contact-less measuring the value of a difference angle between two parts rotating about a common axis
US6598490B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Jun 17, 2002 |
| Grant date | Jul 29, 2003 |
| Priority date | — |
| Expiry date | Jun 17, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L3/104
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for contact-less measuring a difference angle between two parts rotating about a common axis comprises an annular shaped stator having magnetic pole pairs on an inner circumference, and a cylindrically shaped ferromagnetic rotor having pole ends for magnetically scanning the pole pairs of the stator. There are a first air gap between the pole pairs of the stator and the pole ends of the rotor; and an accessible and rotationally symmetric second air gap between the inner circumference of the stator and the rotor. The magnetic flux across the second air gap is changed according to the difference angle between the rotor and the stator. This is determined by a magnetically sensitive element which is arranged at a fixed position within the second air gap.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.