User's Manual

31
9 Loading capacity
Nominal torque can be exceeded statically up to the limit torque. If the nominal torque is
exceeded, additional irregular loading is not permissible. This includes longitudinal forces,
lateral forces and bending moments. Limit values can be found in the chapter
"Specifications" (Chapter 13, Page 115).
Measuring dynamic torque
The torque flange can be used to measure static and dynamic torques. The following rule
applies to the measurement of dynamic torque:
• The transducer calibration performed for static measurements is also valid for
dynamic torque measurements.
• The natural frequency f
0
of the mechanical measurement setup depends on the
moments of inertia J
1
and J
2
of the connected rotating masses, and the torsional
stiffness of the transducer.
Use the equation below to approximately determine the natural frequency f
0
of the
mechanical measuring arrangement:
• The permissible mechanical vibration bandwidth (peak-peak) can also be
found in the specifications.
Nominal (rated) torque M
nom
in %
+ M
nom
Oscillation width
Oscillation width
0
time
t
200% oscillation width
- M
nom
Oscillation width
Fig. 9.1: Permissible dynamic loading
Natural frequency in Hz
Mass moment of inertia in kg·m^2
Torsional stiffness in N m/rad
Version b 13.01.2015 HBM: public