Step 6：Notch Filter Adjustment
A notch filter can suppress the resonance frequency by reducing the gain near the mechanical
resonance.
If the resonant frequency is unknown, it can be obtained by flowing method:
Adjust the load so that the system runs in the resonance region, monitor the actual current at
resonance on the oscilloscope, and then adjust the notch filter to observe whether the resonance
disappears.
When the current data at resonance is collected on the software oscilloscope, the
period value of adjacent harmonics can be measured by the cursor to calculate the resonance
frequency. After collecting multiple sets of harmonic cycles to calculate the average value of the
cycles, the resonant frequency can be calculated using the average value of the cycles.
Table 7-4 Notch filter parameter
⚫
The larger the DEC value set by the output filter, the stronger
the filtering effect.。
⚫
Output filter settings [Hz]=2546/[DEC]
Output filter settings [DEC]=2546/[Hz]
Used to set the frequency of the
internal notch filter to eliminate the
mechanical resonance that occurs
when the motor drives the machine
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