Rotation angle sensing device having enlarged detectable angle range
US7071683B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Sep 26, 2003 |
| Grant date | Jul 4, 2006 |
| Priority date | — |
| Expiry date | Jul 3, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/145
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A rotation angle sensing device for detecting a relative rotation angle between a rotor and a stator includes main magnets, fixed in the rotor, and hole ICs, fixed in the stator. The hole ICs detect magnetic flux of the main magnets , and the relative rotation angle therebetween is detected. A supportive magnet is disposed between the hole ICs so as to offset the magnetic flux of the main magnets. Accordingly, a rotation angle in which the magnetic flux density detected in the hole ICs becomes 0 [mT] can be changed by the supportive magnet. Therefore, a 0° position of the rotation angle can be set to the rotation angle in which the magnetic flux density is detected as 0 [mT], and moreover the detectable range of the rotation angle can be enlarged to be more than 90°.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.