Rotation angle detecting device including magnetic member with concave surface
US7148680B2 · kind B2 · utility
9Cited by
7References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 16, 2004 |
| Grant date | Dec 12, 2006 |
| Priority date | — |
| Expiry date | Aug 18, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/145
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A rotation angle detecting device for a rotation object includes a rotor and a pair of permanent magnets and a magnetic detector disposed at the rotation axis of the rotation object. One of the permanent magnets has a circumferentially extending rut-shape concavity around the magnet detector or an axially extending elliptic columnar surface having a central portion thicker than others to make magnetic flux density in the vicinity of said magnetic detector constant in an axial or a diametrical direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.