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Servo Motor / VFD Filters

These dV/dt filters work equally well for both VFD and servo motors.  

Qualifies for inclusion into UL508A panels

OnFILTER’s patented SF/SV-series servo and VFD motor filters substantially reduce high-frequency leakage currents in motors and in wiring, assisting in compliance with the requirements of IEC61800-3,  IEC60034-17/-25 and NEMA MG 1-2016, as well as with NAMUR recommendations. They also reduce interfering high-frequency noise within the tool resulting from operation of PWM-driven motors.  

SF series filters greatly reduce high-frequency currents on equipment ground, as well as overall EMI in the tool, lowering risk of EOS and reducing errors in automated equipment and testers.

No Mechanical Fitting, No Wear, No Maintenance

OnFILTER' SF/SV series filters have no mechanical coupling to the motors - all connections are electrical.  Their cost of ownership is zero.​

No Programming Changes, No Adjustments

"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.)

We have all 3 filters installed on the machine. They seem to be working very well. It really suppresses the noise we were getting on the analog signals from the sensor (Director of Engineering, U.S.)

Servo / VFD Filter SF20031
Servo / VFD Filter SF20101
Servo / VFD Filter SF20201
Basic Connection of Motor Filter
Basic Connection of Combo Motor/AC Filter
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Servo/VFD Combo Filter Connectons
Servo/VFD Motor Ground Current Without Filter
Servo/VFD Drive Pulse Edge Modification
Reduction of EMI on AC power from servo/VFD drive with SF series filter

EMI reduction >100 times (>40dB)

Ground Current Reduction with SF Series Motor Filters

Pulse Edge Modification

AC EMI Reduction

Application Notes

Filters for Servo Motors and VFD

Practical Aspects of Managing EMI-Caused EOS in IC Handlers and Similar Equipment

Measurements of Conducted Emission in the Manufacturing Environment

EMI-Generated EOS in a Wire Bonder

Mitigating EMI Issues in Servo Motors and Variable Frequency Drives

Dealing with EMI in Semiconductor Device Manufacturing

EOS Sources in Automated Equipment

Managing EMI in Back-End IC Manufacturing, TAP Times

EMI-Caused EOS Exposure of Components and its Mitigation

Origins of EOS in Manufacturing Environment and Its Classification

Technical Articles
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