Angle sensing using differential magnetic measurement and a back bias magnet
US9869566B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 12, 2016 |
| Grant date | Jan 16, 2018 |
| Priority date | — |
| Expiry date | Jul 25, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D2205/773
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A magnetic field sensor includes a back bias magnet to generate a DC magnetic field. First and second magnetic field sensing elements of the magnetic field sensor are disposed proximate to at least one ferromagnetic surface of a ferromagnetic target object. The first and second magnetic field sensing elements generate first and second electronic signals, respectively, in response to first and second sensed magnetic fields corresponding to the DC magnetic field but influenced by the at least one ferromagnetic surface. The magnetic field sensor generates a difference signal that is a difference of amplitudes of the first and second electronic signals. The difference signal is indicative of a rotation measurement of an absolute relative rotation of the ferromagnetic target object and the magnetic field sensor about a rotation axis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.