Rfi/emi filter for variable frequency motor drive system

H - Electricity – 02 – P

Patent

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Details

H02P 27/04 (2006.01) H05K 9/00 (2006.01)

Patent

CA 2669085

An RFI/EMI filter for a variable frequency motor drive system includes a variable frequency drive; a common mode choke; a motor; a cable including a plurality of power leads interconnecting the motor with the variable frequency drive and passing through the choke; a ground shield surrounding the cable and connected to motor ground and variable frequency drive ground; and a common mode return conductor interconnected between the variable frequency drive and the motor and disposed within the shield and passing through the choke for returning a portion of the common mode current to cancel a portion of the saturation current experienced by the choke to increase the portion of the common mode current carried by the return conductor and decrease the portion carried by the shield to reduce the RFI/EMI contributed by the shield.

L'invention porte sur un filtre RFI/EMI pour un système d'entrainement à fréquence variable d'un moteur comportant: une bobine d'arrêt en mode commun; un moteur; un câble à plusieurs conducteurs reliant le moteur à l'entraînement à fréquence variable via la bobine d'arrêt; un blindage entourant le câble et reliée à la terre du moteur et à celle de l'entraînement à fréquence variable; et un conducteur de retour en mode commun placé entre l'entraînement à fréquence variable et le moteur et disposé dans le blindage pour ramener une partie du courant en mode commun, annuler une partie du courant de saturation reçue par la bobine d'arrêt, accroître la partie du courant en mode commun traversant par le conducteur de retour, et réduire la partie traversée par le blindage ainsi que le RFI/EMI auquel contribue le blindage.

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