Torque measurement apparatus
US6826969B1 · kind B1 · utility
18Cited by
18References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 14, 2002 |
| Grant date | Dec 7, 2004 |
| Priority date | — |
| Expiry date | Jun 14, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L3/102
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Torque in a shaft (61) is detected by means of non-contacting sensors (23, 24) sensing a torque-dependent magnetic field emanated by an integral transducer region (64, 32) of the shaft (61) that is circumferentially or longitudinally magnetized. The shaft (61) is driven by a motor (63) and subject to a longitudinal magnetic field (60) which acts on interference field. In one implementation of the invention coils (L1, L2: L3, L4) are energized to provide a counteracting magnetic field to compensate the interference field (60).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.