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ASDA-A3

5

5.7.1.4 Application example

It is advisable to perform domain-frequency analysis and time-domain analysis alternately for

comparing and monitoring the results.

Frequency-domain analysis

Draw Bode plots by setting the Analysis Type to Speed Open-loop in the System Analysis of

ASDA-Soft. The following figure shows the speed open-loop gain with resonance and (1)

indicates the resonance point. Set the frequency at the resonance point as the frequency of the

notch filter and gradually increase the attenuation level (magnitude) of the notch filter in the

corresponding parameter. When increasing the notch depth, you can set the Analysis Type to

Speed Open-loop in the System Analysis* to check if the resonance point is neutralized. If the

notch depth is too shallow, resonance might occur in the system again. If the notch depth is too

deep, the phase margin of the system will be sacrificed, making it difficult to increase the

bandwidth afterwards. It is recommended that the notch depth (magnitude) of the resonance

point should remain at -15 to -10 dB after resonance suppression.

Note: when the frequency setting is lower than 100 Hz, it is advisable to select the check box for Enable

Low Frequency Analysis in the System Analysis of ASDA-Soft. If the check box is not selected, the

zero-crossing frequency might not be correctly detected or the low-frequency resonance point might be

ignored or regarded as noise.

(1)

(2)

(3)

BW

BW

(1) Resonance point; (2) Notch filter; (3) Resonance point after resonance suppression

5-50

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