Rotational angle detection device having two magnetoresistive sensing elements
US4490674A · kind A · utility
68Cited by
4References
21Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 18, 1982 |
| Grant date | Dec 25, 1984 |
| Priority date | — |
| Expiry date | Nov 18, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/247
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A rotational angle detection device having two magnetoresistive sensing elements positioned at a 45.degree. angle with respect to each other senses the rotary position of a permanent magnet. Sine and cosine waves are applied to first and second bridge circuits respectively incorporating the two sensing elements. The resulting bridge circuit outputs are differentially combined to provide an output whose phase relative to either of the input sine or cosine waves is dependent upon the rotational position of the permanent magnet. The phase difference is detected and the rotational position is calculated therefrom.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.