The additional signal can be obtained
by a suitable estimation of the motor CMcurrent by sensing
the CM voltage at the inverter terminals and applying it to a simple equivalent circuit reproducing the CM high-frequency
motor impedance. In practice, the need for the knowledge of
the CM high-frequency motor model is not a limitation, since
the most relevant CM phenomenon, to be reproduced, is tied to
the front-end capacitance toward ground. Therefore, the motor
model can be approximated by only this capacitance, whose
value is nearly constant for induction motors belonging to a
given rated power class, as demonstrated in [31]. With the proposed
approach, the additional signal is built starting from the
CM voltage taken directly at the inverter’s terminals by a capacitive
detector. The performance improvement of the active filter
with the addition of the feed-forward action based on the CM
current estimation is proven by a frequency-domain analysis
(see Section III) where the behavior of the circuit with/without
the feed-forward action is compared
The additional signal can be obtainedby a suitable estimation of the motor CMcurrent by sensingthe CM voltage at the inverter terminals and applying it to a simple equivalent circuit reproducing the CM high-frequencymotor impedance. In practice, the need for the knowledge ofthe CM high-frequency motor model is not a limitation, sincethe most relevant CM phenomenon, to be reproduced, is tied tothe front-end capacitance toward ground. Therefore, the motormodel can be approximated by only this capacitance, whosevalue is nearly constant for induction motors belonging to agiven rated power class, as demonstrated in [31]. With the proposedapproach, the additional signal is built starting from theCM voltage taken directly at the inverter’s terminals by a capacitivedetector. The performance improvement of the active filterwith the addition of the feed-forward action based on the CMcurrent estimation is proven by a frequency-domain analysis(see Section III) where the behavior of the circuit with/withoutthe feed-forward action is compared
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