Multi-turn absolute magnetic encoder
US9389099B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 10, 2014 |
| Grant date | Jul 12, 2016 |
| Priority date | — |
| Expiry date | Jan 10, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D2205/26
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A multi-turn absolute magnetic encoder, comprising (M+1) counting units, a single-turn signal processing unit, and a multi-turn signal processing unit. Each counting unit comprises counting wheels with a cylindrical ring permanent magnet fixed thereon, and a tunneling magnetoresistive angular displacement sensor. The magnetoresistive angular displacement sensor is located within a region in a detection plane of the permanent magnet at within a specific radius range from the axis of the cylindrical ring permanent magnet, within the detection plane the angle of a component of a magnetic field generated by the permanent magnet is linearly proportional to the rotation angle of the cylindrical ring permanent magnet. The single-turn signal processing unit calculates and outputs a code characterizing the absolute angular position of the input shaft based on the sensor signal of the first counting unit; and the multi-turn signal processing unit calculates and outputs the integer number of turns of the input shaft based on the sensor signals of the second counting unit to (M+1) counting units.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.