Inductance position sensor for pneumatic cylinder
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articlePeer-reviewed
acceptedVersion
Author
Ripka, Pavel
Chirtsov, Andrey
Mirzaei, Mehran
Vyhnánek, Jan
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Creative Commons Attribution 4.0 International Licensehttp://creativecommons.org/licenses/by/4.0/
openAccess
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Show full item recordAbstract
The position of the piston in pneumatic cylinder with aluminum wall can be measured
by external inductance sensor without modifications of the aluminum piston
and massive iron piston rod. For frequencies below 20 Hz the inductance is increasing
with inserting rod due to the rod permeability. This mode has disadvantage of slow
response to piston movement and also high temperature sensitivity. At the frequency
of 45 Hz the inductance is position independent, as the permeability effect is compensated
by the eddy current effect. At higher frequencies eddy current effects in the rod
prevail, the inductance is decreasing with inserting rod. In this mode the sensitivity
is smaller but the sensor response is fast and temperature stability is better. We show
that FEM simulation of this sensor using measured material properties gives accurate
results, which is important for the sensor optimization such as designing the winding
geometry for the best linearity.
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