Abstract
A new structure is proposed for the magnetoelastic torque sensors using a pair of figure-eight coils as a pickup. Mutual coupling between two figure-eight coils is used as a measure of torque applied to a shaft. The mutual coupling is governed by torque-induced anisotropic permeability at the surface of the shaft. Basic characteristics of the torque sensor are examined using a tempered steel shaft of 25 mm in diameter and a pair of 25-turn figure-eight coils. Sensitivity was 16 μV/N m and hysteresis was 1.3% at the coil excitation condition of 60 kHz, 0.8 A (RMS). Exciting power needed to reduce hysteresis is much smaller with this structure than with previous methods using self-inductance as a measure of torque.
Original language | English |
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Pages (from-to) | 5916-5918 |
Number of pages | 3 |
Journal | Journal of Applied Physics |
Volume | 75 |
Issue number | 10 |
DOIs | |
Publication status | Published - Dec 1 1994 |
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)