Rotation angle sensor
US8237432B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 25, 2009 |
| Grant date | Aug 7, 2012 |
| Priority date | — |
| Expiry date | Oct 8, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D11/245
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A rotation angle sensor providing excellent output characteristics is provided. The rotation angle sensor has a structure in which a ring-shaped permanent magnet provided so as to be rotatable integrally with a rotor connected to a member to be detected; magnetic flux gathering yokes surrounding the outer circumferential surface of the ring-shaped permanent magnet with a certain clearance being formed between the outer circumferential surface and the magnetic flux gathering yokes; and Hall ICs 30 arranged in gaps between the magnetic flux gathering yokes, are arranged inside a casing formed by a casing body and a cover. In the casing body, a guide tube surrounding the outer circumferential surface of the ring-shaped permanent magnet is formed with a certain clearance being formed between the outer circumferential surface and the guide tube. The guide tube is made of a material having a linear expansion coefficient smaller than that of the casing, and the magnetic flux gathering yokes are fixed to the outer circumferential surface of the guide tube.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.