Servo Motor / VFD Filter SF20031

Servo / VFD EMI filters help to substantially reduce EMI in the equipment and to protect motor's bearing from EDM-caused fluting.  These patented filters are complete multiple-mode filters, providing comprehensive noise reduction, not just reactors.

This model of servo motor/VFD filter is most suited for motors consuming under 3A.  For higher currents please see our 10A and 20A versions.  If you are looking to include an AC input filter for the drive, please see our combo model which combines in one small package both motor and AC filters.

DIN Rail Version
All specifications are subject to change without notice

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"We tested the servo filter on another system, this time with Kollmorgen motors. We saw another significant reduction in noise on our signal"  (P.M.,U.K.)

If you are not sure which specific model would work with your drive/motor, send us a legible photo of drive and/or motor label and if you know, the specific models 

  • No mechanical attachments

  • No changes in software

  • No adjustments

Mounting Dimensions

SF20031, SF20032 and SF20101

DIN Rail Mount Option

This filter is available with DIN rail mount. To the left is shown back of SF20031, SF20032 and SF20101 filters with DIN rail mount.

For DIN rail mount add "-N" to the model number: SF20031-N 

Basic Connections and Performance of  Servo/VFD Motor Filter SF20031

Ground Current Reduction with SF Series Motor Filters

Pulse Edge Modification

Application Notes
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Technical Articles

Interference Technology Magazine' Annual EMC Test and Design Guide, 2016

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What is EMI?  A formal definition of Electromagnetic Interference is that it is a malfunction of equipment caused by excessive high-frequency signals, either radiated (via air), or conducted (via wires).  Often it is also called RFI - Radio Frequency Interference.  Most conventionally, EMI is understood as undesirable high-frequency signals, and EMI filters as devices that suppress such signals while preserving the "good" ones.         

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U.S. Patents 10,263,591; 9,076,806 All specifications are subject to change without notice.

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