Magnetized transducer element for torque or force sensor
US6776057B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | May 14, 2002 |
| Grant date | Aug 17, 2004 |
| Priority date | — |
| Expiry date | May 14, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L3/1435
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A magnetic transducer element for use in sensing torque in a contactless transducer system for rotating shaft comprises an annular region of magnetization induced in the shaft by rotating it about its axis with respect to a magnetizing source oriented to create longitudinal magnetization in the annular region. The source may be a U-shaped (horseshoe) magnet with its poles axially spaced and with the gap between the poles substantially greater than the axial width of the poles. The application of torque to the shaft skews the longitudinal magnetization to generate a torque-dependent tangential circumferential field component. This tangential field component is sensed by an external sensor or sensors adjacent but not in contact with the annular transducer region. A pair of transducer regions can be employed as well as guard or keeper regions to enhance and stabilise the transducer region.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.