Absolute rotary encoder
US10260906B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 27, 2015 |
| Grant date | Apr 16, 2019 |
| Priority date | — |
| Expiry date | Nov 27, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/2497
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A rotary encoder for measuring absolute rotation around an axis of the rotary encoder, comprising: a magnetised element comprising first and second surfaces at an angle to one another; a first magnetic track provided on the first surface and a second magnetic track provided on the second surface, wherein the first and second magnetic tracks subtend an angle θ around the axis of the rotary encoder, wherein each magnetic track comprises a number of magnetic pole pairs, a magnetic pole pair being formed of two poles defining regions of opposite magnetic polarization, wherein the number of magnetic pole pairs in each track are different and have a greatest common factor of one; and first and second magnetic sensor arrangements, the first magnetic sensor arrangement arranged to detect a magnetic field of the first magnetic track and the second magnetic sensor arrangement arranged to detect a magnetic field of the second magnetic track, wherein the magnetic sensor arrangements are rotatably coupled to the magnetised element around the axis of the rotary encoder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.