Electromagnetic actuator with movable coil and position sensor for drive coil
US5682097A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 31, 1996 |
| Grant date | Oct 28, 1997 |
| Priority date | — |
| Expiry date | Jan 31, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/2066
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electromagnetic actuator with position sensor includes a core made of a soft magnetic material, a permanent magnet located adjacent the core for providing a magnetic field in the core and an electrically conductive drive coil wrapped about a first portion of the core. The drive coil is supported such that the drive coil can move along the first portion of the core. An electrically conductive sense coil is wrapped about a second portion of the core and fixed relative to the core such that there is substantially no relative movement between the sense coil and the core. When an electrical current is passed through the drive coil, the drive coil moves along the first portion of the core and an electrical current is induced in the sense coil which indicates the position of the drive coil relative to the first portion of the core.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.