Servo Motor / VFD Filters

PWM-driven motors - servo motors and variable frequency drives (VFD) - are a major source of electromagnetic interference (EMI) in equipment.  They also cause a number of problems in equipment, including damage to the motor’s bearings due to leakage current causing electrical discharge machining (EDM) and damage to motor’s insulation.  

"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.)

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.​

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.)

  • No mechanical attachments

  • No changes in software

  • No adjustments

 
Click on the model suitable for your motor/drive for details
Servo / VFD Filter SF20031
Servo / VFD Filter SF20032
Servo / VFD Filter SF20101
Servo / VFD Filter SF20201
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Basic Connection of Motor Filter
Basic Connection of Combo Motor/AC Filter
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Servo/VFD Combo Filter Connectons
Reduction of EMI on AC power from servo/VFD drive with SF series filter
Servo/VFD Motor Ground Current Without Filter
Servo/VFD Motor Ground Current with SF Series Filter
Servo/VFD Drive Pulse Edge Modification
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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