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Reduce EMI and Improving Reliability of PWM Motors with Motor Filters

Servo/VFD Filters in Motion Control

Servo and stepper motors, and VFD have two major EMI-related problems: excessive electromagnetic interference in equipment, and damage to the motor bearings caused by excessive high-frequency currents flowing through them. Vibration that causes problems for precision positioning, is also one of the artifacts of bearing damage.  Excessive EMI causes problems with measurements and equipment operation.

All pulse-width driven motors suffer deterioration of bearings (often called EDM - electric discharge machining). This article describes the problem in details.

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OnFILTER Patented Solution: No Mechanical Fitting, No Wear, No Maintenance

OnFILTER' SF/SV-series dedicated dV/dt servo and variable-frequency drives (VFD) filters, and TF/TV-series stepper motor filters transform sharp edges of drive pulses into much less "polluting" gradual ramps and, uniquely, provide additional filtering in the motor's ground reducing current through bearings, typically 50 to 100 times.  

Reduction of Ground Current with SF Series Motor Filters

Relevant Products:

Ground-Current-Teparuk-3-n.jpg

No filter

SF-Series filter

GLE30-1-Voltage-30fv1.jpg

Ground current: 1.72A

Ground current: 7.3mA

Measured with Tektronix' CT1 probe 5mV/mA

Questions?  Ask Us

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EOS Sources in Automated Equipment

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Origins of EOS in Manufacturing Environment and Its Classification

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Servo and Other PWM Motors in Semiconductor Manufacturing

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