RFI/EMI filter for variable frequency motor drive system

Details RFI/EMI filter for variable frequency motor drive system RFI/EMI filter for variable frequency motor drive system

2007-11-16

2010-06-22

Masih, Karen (Department: 2837)

Electricity: motive power systems

Synchronous motor systems

Brushless motor closed-loop control

C318S400250, C318S811000

Reexamination Certificate

active

07741798

ABSTRACT:
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.

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G. Skibinski, et al., “Generation, Control and Regulation of EMI from AC Drive”, IEEE 1/1997 07803-4070, 1997 (13 pages total).
G. Skibinski, et al., “EMI Emissions of Modern PWM ac Drives”, IEEE Industry Applications Magazine Nov./Dec. 1999, pp. 47-81.

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