Figs. 15 and 16show the frequency spectra of the motor CM
voltage with the active filter when no feed-forward current signal
injection is present and when this injection is performed, respectively.
From Fig. 15, it is clear that the feedback filter action
produces a reduction of the low frequency peaks. In particular,
the 20 kHz peak exhibits a reduction of 8 dB. Consequently,
the new amplitude of the CM voltage is about 3.8 V. The effect
of the introduction of the additional signal, shown in Fig. 16,
is a reduction of frequency components higher than 100 kHz
of the CM voltage spectrum, as expected. A comparison of the
motor CM currents spectra without any active filter and with
the proposed circuit, without and with the feed-forward current
action, is possible by observing Figs. 17–19.
Figs. 15 and 16show the frequency spectra of the motor CM
voltage with the active filter when no feed-forward current signal
injection is present and when this injection is performed, respectively.
From Fig. 15, it is clear that the feedback filter action
produces a reduction of the low frequency peaks. In particular,
the 20 kHz peak exhibits a reduction of 8 dB. Consequently,
the new amplitude of the CM voltage is about 3.8 V. The effect
of the introduction of the additional signal, shown in Fig. 16,
is a reduction of frequency components higher than 100 kHz
of the CM voltage spectrum, as expected. A comparison of the
motor CM currents spectra without any active filter and with
the proposed circuit, without and with the feed-forward current
action, is possible by observing Figs. 17–19.
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