Reduce EMI and Improving Reliability of Servo Motors and VFD
with Motor Filters
Servo motors and VFD have two major EMI-related problems: excessive EMI 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.
No Mechanical Fitting, No Wear, No Maintenance
OnFILTER' patented SF-series dedicated dV/dt servo and variable-frequency drives (VFD) filters 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.
Relevant Products:
Reduction of Ground Current with SF Series Motor Filters
Measured with Tektronix' CT1 probe 5mV/mA
No filter
SF-Series filter
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Technical Article
Interference Technology Magazine' Annual EMC Test and Design Guide, 2016