Rotary position sensors employing planar coils
US4507638A · kind A · utility
Inventor
Key dates
| Filing date | Dec 10, 1981 |
| Grant date | Mar 26, 1985 |
| Priority date | — |
| Expiry date | Dec 10, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D2205/73
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A series of rotary sensors are disclosed. Each sensor consists of a drive coil which is a planar coil configuration separated from a sensing coil which is parallel to the drive coil. Interposed between the drive and sensing coils is a rotatable plate fabricated from a material capable of blocking a magnetic field induced in a drive coil from reaching or activating the sensing coil. The rotatable plate is shaped to allow predetermined amounts of flux to couple from the drive coil to the sensing coil as the plate is rotated. The shape of the plate therefore determines the signal provided at the sensing coil to enable one to provide such signals indicative of the angular movement of the plate between wide limits as from zero to 360.degree.. Other configurations utilizing a plurality of drive and sense coils and special shaped plates provide sine and cosine outputs as well as enable one to determine the quadrant of operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.