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Subject: non-contact torque sensor (no strain gauge)
Posted by: Gérard D'Ans
E-mail: gdans(at)ulb(dot)ac(dot)be(no spam)
Does anyone know about non-contact
torque sensors that operate from the
variation of magnetic permeance upon
Approach their head with
a central primary spool to generate
variable mag field (carrier)
2 pairs of secondary opposite spools
wired differentially into a demodulator
to the rotating shaft ferromagnetic surface such that
diagonals are 45° from shaft centerline.
Then subtract demodulated secondary
voltages. You get an image of transient
Ten years ago, AEG Kanis produced such
sensors. Any other company?
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