Stepper Motor Filters

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.  

OnFILTER’s patented TF/TV-series filters stepper motor filters substantially reduce high-frequency leakage currents in motors and in wiring, assisting in compliance with the requirements of IEC61800-3IEC60034-17/-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.  

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.

  • No mechanical attachments

  • No changes in software

  • 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
 

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Basic Connection of Stepper Motor Filter
Reduction of Ground EMI Current with Stepper Motor Filters
 
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Ground Current
Drive Pulse
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No Filter
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With Stepper Motor Filter
Ground Current
Drive Pulse
32 times or 30dB ground current suppression
Application Notes

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

EMI-Caused EOS Exposure of Components and its Mitigation

Origins of EOS in Manufacturing Environment and Its Classification

Technical Articles