Servo Motor / VFD Filter SF20201

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 up to 20A.  For lower current applications see our 3A and 10A models.   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 EMI filters.

All specifications are subject to change without notice

Request a Quote

"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
Click on drawing to enlarge

SF20201 Dimensions - click to magnify

Basic Connections of Servo / VFD Motor Filter

SF20101 shown - connections for SF20201 are identical

Ground Current Reduction with SF Series Motor Filters

Pulse Edge Modification

Application Notes
Please reload

Technical Articles

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

Please reload

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.         

 ©2017-2021 OnFILTER, Inc. CleanSweep is a registered trademark of OnFILTER

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

Terms and Conditions of Sale

Tel. +1.831.824.4052  FAX +1.206.360.7458

Our products are made in U.S.A.