Sensor and method for measuring torque and/or axial stresses
US5386733A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 29, 1992 |
| Grant date | Feb 7, 1995 |
| Priority date | — |
| Expiry date | Jun 29, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L3/103
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention relates to a sensor and to a method for measuring torque and/or axial stresses applied to an object as well as a method for manufacturing magnetoelastic material to be used therefore. The sensor (20) comprises a magnetoelastic material and a sensing device (210) for non-contactingly sensing changes in permeability of the magnetoelastic material due to torque and/or axial stresses, said sensing device (310) comprising a coil system carrying out both an excitation and a pick-up function. The excitation frequency is so chosen that the pre-dominating process of magnetization of the magnetoelastic material will be small angle magnetization rotation, the excitation frequency being at least 300 kHz.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.