Magnetic encoder
US11644344B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 1, 2021 |
| Grant date | May 9, 2023 |
| Priority date | — |
| Expiry date | Mar 1, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/2451
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A magnetic encoder includes one or more sensors and an encoder element having at least two tracks of encoder regions. Each region comprises a magnetic pole. Each sensor has one or more sensing elements associated with a respective track and generates an output that is indicative of the magnetic field associated with that track. At least one track has a differing number of poles to at least one of the other tracks. The properties of the poles of a first one of the tracks differ along the track such that there is a periodic variation along the first track of the magnetic field emitted by the first track that is detected by the sensing elements associated with the first track which at least partially cancels out a corresponding periodic variation in field from the other tracks that is also detected by the sensing elements associated with the first track.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.