Rotation angle detection device
US7671584B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 9, 2006 |
| Grant date | Mar 2, 2010 |
| Priority date | — |
| Expiry date | Jun 9, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D2205/40
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention attains downsizing of a permanent magnet with a simple structure to reduce a manufacturing cost thereof. Provided is a rotation angle detection device, including: a cylindrical magnetic circuit mounted to a shaft; and non-contact sensors provided in an inner void of the magnetic circuit, in which the magnetic circuit is composed of a first yoke and a second yoke formed of a magnetic material and having a pair of flat portions parallel and opposed to each other, and a pair of permanent magnets whose magnetic poles are aligned in the same direction so that magnetic fields whose magnetic fluxes are parallel to each other are generated in the void between the flat portions, and the non-contact sensor detects a rotation angle of the shaft by detecting a change in the direction of the magnetic fluxes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.