Magnetic rotation-angle detector
US9702735B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 21, 2013 |
| Grant date | Jul 11, 2017 |
| Priority date | — |
| Expiry date | Jul 19, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/245
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Provided is a magnetic rotation-angle detector that includes a disk-shaped magnet that is magnetized so as to change magnetic poles n times per rotation (where n is an integer equal to or larger than 1); a magnetic-body slit plate that is rotated together with the magnet, where a part having a high magnetic flux permeability and a part having a low magnetic flux permeability are alternately and repeatedly arranged thereon so as to change the magnetic flux permeability m times per rotation (where m is an integer equal to or larger than 2 and m>n); a magnetic sensor that detects magnetism from the magnet when the magnet has passed by through the magnetic-body slit plate; and a calculation unit that obtains the rotation angle of the magnet from the output from the magnetic sensor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.