PWM-driven motors – servo motors, stepper motors, and variable frequency drives (VFD) – 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.
New wide bandgap devices in the drives – SiC and GaN- based – have much faster rise and fall times of drive pulses – often 50 times faster. This greatly increases leakage current to ground, associated bearings damage, as well as overall EMI levels in the host equipment. http://www.onfilter.com
OnFILTER offers motor EMI filters for all three types of PWM motors – VFD, servo, and stepper motors. Patented technology employed in these filters substantially reduce high-frequency leakage currents in motors and in wiring, assisting in compliance with the requirements of IEC61800-3, IEC60034-17/-25 and NEMA MG 1-2016, as well as with NAMUR recommendations. The filters also reduce interfering high-frequency noise within the tool resulting from operation of PWM-driven motors.