Reduce EMI and Improving Reliability of PWM Motors with Motor Filters
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
No filter
SF-Series filter
Ground current: 1.72A
Ground current: 7.3mA
Measured with Tektronix' CT1 probe 5mV/mA
Questions? Ask Us
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
Managing EMI in Back-End IC Manufacturing, TAP Times
EMI-Caused EOS Exposure of Components and its Mitigation
Origins of EOS in Manufacturing Environment and Its Classification
Servo and Other PWM Motors in Semiconductor Manufacturing
Technical Articles
