Technical Articles
Stepper Motor Filters
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PWM-driven motors, such as stepper motors 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. ​
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OnFILTER’s patented TF/TV-series dV/dt stepper 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.
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TF/TV 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.
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No mechanical attachments
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No changes in software
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No adjustments
No Mechanical Fitting, No Wear, No Maintenance
OnFILTER' TF/TV series filters have no mechanical coupling to the motors - all connections are electrical. Their cost of ownership is zero.​
Click on the model suitable for your motor/drive for details
Attention Danfoss Customers:
This model has been approved by Danfoss as a replacement for an obsolete Danfoss model
AKA 211. No change in software is required.
Request a Quote
Basic Connection of Stepper Motor Filter
Reduction of Ground EMI Current with Stepper Motor Filters
Ground Current
Drive Pulse
No Filter
Ground Current
Drive Pulse
With Stepper Motor Filter
32 times or 30dB ground current suppression
Application Notes
Technical Articles
