Magnetoresistive encoder for tracking the angular position of a rotating ferromagnetic target wheel
US5754042A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jun 20, 1994 |
| Grant date | May 19, 1998 |
| Priority date | — |
| Expiry date | Jun 20, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/2497
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for detecting precise angular positions of a rotating object. Two magnetoresistors (MRs) are positioned adjacent a target wheel attached to the rotating object, the target wheel having at least one element of finite length. Each MR is responsive to the passage of at least one of the elements as the target wheel is rotated, generating an analog signal with signal transitions between two voltage levels at the passage of the element's leading and trailing edges. The MRs are positioned relative to the elements such that their signals are phase shifted with respect to one another, resulting in time overlapping signals which intersect at a precise angular positions of the target wheel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.