System for determining at least one rotation parameter of a rotating member
US11598825B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 12, 2020 |
| Grant date | Mar 7, 2023 |
| Priority date | — |
| Expiry date | Sep 29, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/24438
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention relates to a system comprising a coder that has an alternation of North and South magnetic poles separated by transitions extending along a helix of pitch p and of angle α, the magnetic track having Npp pairs of North and South poles and a polar width Lp measured along a normal to the transitions which are: Npp=πa/l and Lp=p·cos α. The invention also includes at least one sensor able to detect the rotating magnetic field in a plane perpendicular to the magnetic track and to the transitions by means of a mounting of at least two sensitive magnetic elements. The mounting being disposed at a radial reading distance from the magnetic track and being arranged to deliver signals in quadrature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.