Magnetic position sensor having shaped pole pieces to provide a magnetic field having a varying magnetic flux density field strength
US6653830B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 19, 2002 |
| Grant date | Nov 25, 2003 |
| Priority date | — |
| Expiry date | Feb 23, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/145
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A magnetic sensor is provided which includes a pair of magnets and a pair of shaped pole pieces positioned adjacent respective ones of the magnets and spaced apart to define an air gap therebetween. The magnets and the shaped pole pieces cooperate to provide a magnetic field having a magnetic flux density that varies along a length of the air gap. A magnetic flux sensor is positioned within the magnetic field to sense varying magnitudes of magnetic flux density along the length of the air gap and to generate an output signal representative of a position of the magnetic flux sensor relative to the magnetic field. In one embodiment, the air gap defines a varying width to provide varying magnitudes of magnetic flux density along the length. In another embodiment, the shaped pole pieces include portions of varying thickness to provide varying magnitudes of magnetic flux density along the length.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.