Configuration
5.4 Mounting
1FW3 complete torque motors
116 Configuration Manual, 08/2020, A5E46027705B AA
Influence of the torque arm on the speed control loop
By connecting the stator through a flexible element, with respect to the machine foundation,
the stator represents an additional system that can oscillate (see Fig A), in addition to the
two-mass system comprising the load and rotor (see Fig. B).
The influence of the Siemens torque arm is shown qualitatively in the following diagram. The
two-mass oscillating system comprising motor and load still dominates the system response;
however, coupling the stator through the Siemens torque arm is manifested in the form of
additional resonance effects, which must be dampened by the closed-loop control.
Figure 5-14 Speed control loop – influence of the Siemens torque arm
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