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The measuring elements (strain gauges) are mounted on the four bars
in a compensating circuit. These elements react in the usual way to the
deformation of the bar caused by the measured torque. Since only tangential
forces are to be measured, the bars can be very rigid in radial direction
and therefore very resistant to stress. In addition the measuring elements
are applied and connected in a special way so that the influence of radial
forces on the measuring signal is negligible. This allows direct connection
of jointed shafts without an additional intermediate bearing.
The entire measuring technology is accommodated in the torque flange.
The measuring elements are supplied and the measuring signal conditioned
as an FM signal by an electronics unit rotating at the center of the flange.
Therefore only the supply voltage and the finished measuring signal have
to be transferred from or to the outside. Transmission takes place without
slip rings thus guaranteeing high reliability even at high speeds. The
torque flange is calibrated directly with the lever arm and weights. Calibration
by defined adjustment of the measuring bridge is also available for quick
checking the measuring instrument.
The torque hub T36FN, developed in coopearation with Siemens, was first
used in 1990. The torque flange T10FS, witch has been completely new developed
on the basis of the torque hub T36FN, was first deployed in 2000 on Siemens
motor test rigs. Today the torque flange has become a standard measuring
instrument on motor, gear and automotive test rigs.
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