Rotation angle sensing device
US10775195B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 3, 2017 |
| Grant date | Sep 15, 2020 |
| Priority date | — |
| Expiry date | Feb 7, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/165
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A rotation angle sensing device is provided with a magnet that is placed to be integrally rotatable with a rotary shaft of a rotating body in association with a rotating body, where the shape of the magnet as viewed along the rotary shaft is substantially circular; a magnetic sensor part that outputs a sensor signal based upon a change in a direction of a magnetic field in association with the rotation of the magnet; and a rotation angle detecting part that detects a rotation angle of the rotating body based upon the sensor signal output by the magnetic sensor part. The magnet has a component of a magnetization vector in a direction that is orthogonal to the rotation axis. When a circular virtual plane that is orthogonal to the rotary shaft centering upon the rotary shaft is set in the vicinity of the magnet, the magnetic sensor part is placed at a position where the amplitudes of the magnetic field intensity Hr in the radial direction and the magnetic field intensity Ho in the circumferential direction on the virtual plane are substantially the same, and the magnetic field intensity Hr in the radial direction and/or the magnetic field intensity Ho in the circumferential direction …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.