NDLI: Noncontact capacitive torque sensor for use on a rotating axle

Content Provider	IEEE Xplore Digital Library
Author	Wolffenbuttel, R.F. Foerster, J.A.
Copyright Year	1963
Abstract	The measurement of the torque in a mechanically loaded axle is often required for automotive power-train and engine-control systems. Torque sensing has been performed by mainly using strain gauges connected to the axle with slip rings to allow the electrical contacting. Noncontact magnetic and optical techniques have also been used. In the proposed capacitive torque sensor, two angular displacement sensors are spaced apart at a well-defined distance. The rotor of each of these capacitive displacement sensors is composed of an array of electrodes and sine-wave voltages with phase angles in the sequences 0 degrees , 90 degrees , 180 degrees , 270 degrees applied to it. These voltages are capacitively coupled from the stator to the rotor. The stator is also equipped with a readout electrode. The phase angle of the sine wave on this readout electrode is proportional to the rotor-to-stator electrode overlapping and thus proportional to the angular position. The phase difference between the output signals of the angular displacement transducers is a direct measure of the twist angle and thus of the torque in the axle. The sensor allows the noncontact torque measurement on a 10-mm-diameter steel axle in the 0-100-N-m range.<>
Sponsorship	IEEE Instrumentation and Measurement Society Bureau international des poids et mesures IEEE International Bureau of Weights and Measures (BIPM) URSI NBS Agency Ind. Sci. & Technol., Min. Int. Trade & Ind. Sci. Council Japan International Union of Pure and Applied Physics (IUPAP) NIST NRCC National Conference of Standards Laboratories (NCSL) Allen Osborne Associates Andeen-Hagerling, Inc. Ballantine Lab. Inc. Clarke-Hess Communications Research Corp. Fluke Corporation Guildline Instruments Hewlett-Packard Co. Julie Res. Lab. Inc. Keithley Instruments, Inc. Measurements International Ltd. Canada QuadTech Inc. Quantum Design Inc. Rotek Instrum. Corp. Tegam Inc. Tektronix Inc
Starting Page	1008
Ending Page	1013
Page Count	6
File Size	547050
File Format	PDF
ISSN	00189456
Volume Number	39
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1990-12-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Capacitive sensors Axles Magnetic sensors Electrodes Torque measurement Sensor arrays Phased arrays Voltage Stators Mechanical variables measurement
Content Type	Text
Resource Type	Article
Subject	Instrumentation Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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