Stepper Motor Filters
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No mechanical attachments
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No changes in software
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No adjustments
These filters qualify for UL 508A panels by being low voltage, low energy devices
Stepper motors are driven by the pulses with sharp edges. As a result, they 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 the motor’s insulation.
​OnFILTER’s patented TF/TV-series dV/dt filters for bipolar stepper motors 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 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.​
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Basic Connection of Stepper Motor Filter
Reduction of Ground EMI Current with Stepper Motor Filters
No Filter
With Stepper Motor Filter
32 times or 30dB ground current suppression
Ground Current
Ground Current
Drive Pulse
Drive Pulse
Application Notes
Technical Articles
