Product category:
Loadcells, Force Sensors and Torque Sensors
News Release from: Sensor Technology | Subject: Torqsense RWT Rotary Torque Transducers
Edited by the Engineeringtalk Editorial
Team on 11 January 2002
Rotary Torque Transducers use innovative
technique
Torqsense RWT Rotary Torque Transducers are not only exceptionally accurate, but more importantly, require no physical contact between the revolving shaft and its housing
Sensor Technology has introduced its new range of Torqsense RWT Rotary Torque Transducers With full-scale ranges between 100 mNm and 10,000 Nm, the E300 RWT1 series of transducers utilizes the little known Surface Acoustic Wave (SAW) phenomenon
This article was originally published on Engineeringtalk on 29 Aug 2008 at 8.00am (UK)
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The latest additions to the Torqsense range feature a two-piece design, so that the compact head can be fitted into even the smallest of spaces.
This SAW approach has allowed the development of small transducers, which are not only exceptionally accurate, but more importantly, require no physical contact between the revolving shaft and its housing.
In a Torqsense transducer, the surface waves are produced by passing an alternating voltage across the terminals of two interleaved comb-shaped arrays that are laid onto one end of piezoelectric substrate.
A similar 'receiving' array, at the other end of the substrate, converts the wave back in to an electric signal.
The frequency of the wave generated is dependant on the spacing of the 'teeth' in the comb array and as the direction of the wave propagation is at right angles to the teeth, any change in its length alters the spacing of the teeth and the operating frequency.
To measure torque in a shaft, two SAW sensors are bonded rigidly to a shaft at 45 degrees to the axis and connected in a "half bridge" configuration, so that when the shaft is subjected to a torque, outputs are combined to produce a 'difference' signal proportional to applied torque.
This signal is exchanged via a capacitive rotor and stator.
Torqsense transducers require minimum length of shaft, have low inertia, no physical contact between shaft and housing, wide bandwidth, high resolution and accuracy, and excellent noise immunity.
The technology lends itself to design of OEM transducers for specific customer applications.
The transducers are available with RPM output and IP65 sealing as options, and interface with the E302 Advanced Torque Transducer Display, which features full temperature correction for changes in the modulus of elasticity of the shaft.
The E302 can be interfaced with Torqview Virtual Instrumentation Display PC Software to give a self contained data display and recording system.
Applications include Automotive, Aerospace, Viscosity and Consistency Measurement, Motor and Machinery Control and Condition Monitoring, and Torque Control of Tightening Procedures. Request a free brochure from Sensor Technology ...
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