System for determining at least one rotation parameter of a rotating member
US11204260B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 12, 2020 |
| Grant date | Dec 21, 2021 |
| Priority date | — |
| Expiry date | Mar 26, 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 an helix of pitch p and of angle α. The invention having Npp pairs of North and South poles and a polar width Lp measured along a normal (N) to the transitions which are: Npp=πa/I and Lp=p.cos α. The invention also includes a sensor able to detect the period magnetic field emitted by the coder by means of at least two sensitive magnetic elements which are disposed at a radial reading distance from the magnetic track. The sensitive elements are disposed in relation to one another to deliver signals in quadrature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.