Magnetostrictive torque sensor and design method of thickness of magnetic ring for magnetostrictive torque sensor
US11774305B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Dec 27, 2021 |
| Grant date | Oct 3, 2023 |
| Priority date | — |
| Expiry date | Dec 27, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L3/102
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A magnetostrictive torque sensor includes detection coils formed around a magnetostrictive material made of chrome steel or chrome molybdenum steel, a magnetic ring configured to cover around the detection coils, and a drive unit for providing alternating current excitation to the detection coils at an excitation frequency of 50 kHz or more and 333 kHz or less. A torque applied to the magnetostrictive material is detected based on a change in inductance of the detection coils. The magnetic ring is configured by wrapping around the detection coils with an amorphous tape made of amorphous soft magnetic material in a tape shape. The thickness of the magnetic ring is 1.455 times or more as thick as a skin effect thickness of the magnetostrictive material and less than 1.000 mm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.