A new structure of torque sensors using thin pickup head - Use of mutual coupling modulation

Ichiro Sasada, F. Koga

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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 languageEnglish
Pages (from-to)5916-5918
Number of pages3
JournalJournal of Applied Physics
Issue number10
Publication statusPublished - Dec 1 1994


All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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