Torque sensor for detecting occurrence of metal fatigue in an elastic body
US10557766B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 20, 2016 |
| Grant date | Feb 11, 2020 |
| Priority date | — |
| Expiry date | Jul 20, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L25/003
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A torque sensor includes: an annular deformation body; first and second displacement electrodes which cause displacement by elastic deformation of the annular deformation body; first and second fixed electrodes arranged at positions opposite the first and second displacement electrodes; and a detection circuit that outputs an electric signal indicating a torque based on a variation amount of capacitance values of first and second capacitive elements each of which is configured of the displacement electrode and the fixed electrode. The annular deformation body includes a high elastic portion and a low elastic portion having a spring constant smaller than a spring constant of the high elastic portion. The detection circuit determines whether the torque sensor functions normally based on a ratio between first and second electric signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.