Motors with Motor Filters

Pilz – Safe automation, automation technology - Pilz INT

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.  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.

OnFILTER’ patented SF/SV-series  dedicated dV/dt servo and variable-frequency drives (VFD) filters and and TF/TV-series stepper motor filters and TF/TV-series transform sharp edges of drive pulses into much less “polluting” gradual ramps and also provide additional filtering in motor’s ground reducing current through bearings typically 80 to 100 times.  

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