Novatech's Static Torque Transducer.
Earlier this year, we officially launched the F311 Static
Torque Transducer and already we are pushing forward
the boundaries of what we originally thought possible.
We have recently manufactured two F311-Z3075 Static Torque
Transducers with a very low torque range :- 10mNm (milli Newton
metres) to be exact ! The low torque range was due to the specific
application which is to measure the torque reaction within an
automotive instrumentation dynamometer. This low torque range
was made possible by a clever double bending beam sensing
element.
This enables us to achieve a high enough strain level and hence
signal from such a very low torque. This design also has very good
EFI (Extraneous Force Immunity). The Static Torque Transducer is
mounted to “earth” via the three fixings in the outer ring, with the
torque being transmitted though the centre boss.
The performance of the Transducer exceeded our expectations
in many respects. The customer's fittings within the dynamometer
exerted a radial side load of 7g on the loadcell. This may sound
small but when you think 10mNm is roughly equal to 20g on a
50mm moment arm, you can see the scale involved. However,
the loadcells excellent EFI characteristics helped it achieve an
error of only 0.026% RT from the 7g side load ! The overall
performance was also very good with a typical non-linearity of
0.036% RT.
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February 2003
