Linear position sensor assembly having magnetic shield
US9322632B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 31, 2012 |
| Grant date | Apr 26, 2016 |
| Priority date | — |
| Expiry date | Dec 31, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D1/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A linear position sensor assembly having a magnetic shield minimizes interference (noise) from adjacent electrical and electromagnetic devices, particularly solenoids. The sensor assembly includes a permanent magnet linear contactless displacement (PLCD) sensor comprising a pair of magnetic field sensors which are spaced apart by a member of high magnetic permeability such as a metal bar. The sensors and metal bar are enclosed, i.e., surrounded on three sides, by a cover or shield of high magnetic permeability material such as steel or mu metal, for example. A permanent magnet is disposed in sensed proximity to the sensors and translates with a clutch actuator component. When the clutch actuator component translates axially, the two field sensors provide a signal to associated electronics having high linearity, low noise and no deadband.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.