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TI71M01D06-01EN 3rd Edition: 2012.12.01
Phase Lag Compensation Filter
The phase lag compensation filter is a first-order delay filter. Set the -3 dB bandwidth
frequency in #24 and set the frequency at which the maximum damping gain b3 dB
in #25.
Compared to the velocity feedback filter, the frequency of the maximum damping gain can be
set freely for this filter. It can thus minimize the amount of phase lag.
Moreover, this filter is effective when the resonance frequency is high in a wide range.
However, compared to the notch filters, the damping amount is small; it is not suitable when
the gain of the resonance peak is high.
The figures below show the frequency characteristics of the phase lag compensation filter.
#
24
=
40Hz
#
25
=
160Hz
#
24
=
40Hz
#
25
=
400Hz
Frequency [Hz]
Gain [dB]
Frequency [Hz]
Phase [deg]