YASKAWA SGD7S Product Manual page 349

8.14 Diagnostic Tools
8.14.1 Mechanical Analysis
Frequency Characteristics
The Servomotor is used to cause the machine to vibrate and the frequency characteristics from
the torque to the motor speed are measured to determine the machine characteristics. For a
normal machine, the resonance frequencies are clear when the frequency characteristics are
plotted on graphs with the gain and phase (Bode plots). The Bode plots show the size (gain) of
the response of the machine to which the torque is applied, and the phase delay (phase) in the
response for each frequency. Also, the machine resonance frequency can be determined from
the maximum frequency of the valleys (anti-resonance) and peaks (resonance) of the gain and
the phase delay.
For a Servomotor without a load or for a rigid mechanism, the gain and phase change gradually
in the Bode plots.
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Toolbar
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START Button
Click the START Button to start analysis.
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Measurement and Notch Filter Setting Tab Pages
Measurement Tab Page: Displays detailed information on the results of analysis.
Notch Filter Setting Tab Page: Displays the notch filter frequencies. You can set these values in the parameters.
8-94
Estimated Estimated
Anti-Resonance Resonance
Frequency Frequency
Estimated Resonance
Frequency
Second Candidate
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