Page 16
Torque Sensor
Model 8627, 8628, 8632
6.4.2
Natural Resonances
Estimate of the mechanical natural frequencies:
f
0
=
1
. c .
(
1
+ 1
)
2
.
f
J
1
J
1
Further methods for the calculation of natural resonances are corresponding
purchasable programs or books /e.g. Holzer-Procedure, Dubbel, Taschenbuch
für den Maschinenbau, Springer Verlag).
Operation of the device in natural resonance can lead to permanent
damages.
6.5
Disturbance Variables
By disturbances, measured value falsifications can occur by
►
vibrations,
►
temperature gradients in the torque sensors,
►
temperature changes,
►
electrical disturbances,
►
magnetic disturbances,
►
EMC (electromagnetic disturbances),
therefore avoid these disturbance variables by decoupling of vibrations, cov-
ers, etc.
f
0
= Natural frequency in Hz
J
1
,
J
2
= Moment of iteria in kg*m
2
c
= Torsional rigidity in Nm/rad
J
1
c
J
2