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ASDA-A3
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Tuning
Q factor of notch filter
The Q factor of the notch filter determines the frequency range (amount of signal) around the
specific frequency to be filtered. The higher the Q factor, the narrower the filtered frequency
band, and thus the phase margin of the system is less affected. In general, for systems with
higher inertia (weight) or lower stiffness, the Q factor at the resonance point is relatively high.
If the Q factor is set too high, the resonance cannot be completely suppressed, and it is likely to
cause resonance at the cut-off frequencies around the resonance point. In this case, set the
Q factor lower to improve the condition.
0
-5
-10
-15
-20
102
50
Q factor = 1
Q factor = 5
Q factor = 10
103
Frequency [Hz]
5
0
-50
102
103
Frequency [Hz]
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5-49