Rotation angle detection device having magnetic flux alteration unit
US7378838B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 12, 2006 |
| Grant date | May 27, 2008 |
| Priority date | — |
| Expiry date | Jan 12, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/145
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A rotation angle detection device has a magnetism detection unit, a magnetic flux generation unit for applying magnetic flux to the magnetism detection unit, and a magnetic flux alteration unit provided for the magnetic flux generation unit. The magnetic flux generation unit is rotated relatively to the magnetism detection unit. A relative rotation angle between the magnetism detection unit and the magnetic flux generation unit is detected based on a density of the magnetic flux passing through the magnetism detection unit. The magnetic flux alteration unit alters a distribution of the magnetic flux generated by the magnetic flux generation unit, to compensate a deviation of the distribution of the magnetic flux.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.