System for determining the position of a movable member
US8058867B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 18, 2008 |
| Grant date | Nov 15, 2011 |
| Priority date | — |
| Expiry date | Mar 29, 2030 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B15/2861
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A first magnet is secured to the movable member at a first axial position and is associated with a first magnetic field. A secondary magnet is secured to the movable member at a secondary axial position and is associated with a secondary magnetic field. A sensor assembly comprises magnetic sensors arranged in an array (e.g., on a fixed member). A first magnetic sensor is spaced apart from the sensor assembly such that the first magnetic sensor detects the first magnetic field of the first magnet in a first state and an absence of or change in the first magnetic field in a second state. A data processor is arranged for determining an axial position of the moveable member based on at least one of the magnetic fields sensed by the sensor assembly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.