Inductive position sensor
US4507639A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 13, 1983 |
| Grant date | Mar 26, 1985 |
| Priority date | — |
| Expiry date | May 13, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/204
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A non-contacting position sensor has an exciting coil in a plane and has a sensing coil in an intersecting plane so sensing coil portions are symmetrical around an exciting coil portion in mutually inductive relation to that portion of the exciting coil portions. A ferrite member magnetically shields those sensing coil portions from other portions of the exciting coil and a housing mount the sensor for relative movement with respect to magnetically permeable or electrically conductive inductance-modifier on an object whose position is to be monitored. Movement of the inductance-modifier as the object moves modifies mutual inductance between the respective sensing coil portions and the exciting coil portion so that, when the exciting coil is driven, the sensing coil provides a signal representative of the object position. If desired, an additional sensing coil is disposed in a third plane to provide X-Y position sensing. The inductive position sensor provides a reversal in output signal polarity when the object moves through a selected position where digital output may be required. The sensor regulates operating parameters of an automobile in response to change in position of an aut…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.