Motors & Motion
Schaffner introduces Sine Wave filters for VFD motor drives
By Renée Francoeur
June 25, 2015 – The new lineup of Sine Wave filters from Schaffner eliminate premature motor damage caused by high dv/dt, overvoltages, cable ringing, motor overheating and eddy current losses caused by Variable Frequency Drives (VFD), says Schaffner.
Suitable for motor frequencies up to 600Hz, this technology converts the rectangular PWM output voltage of motor drives into a smooth sine wave with low residual ripple. Sine Wave filters can improve bearing life by eliminating circulating bearing currents, the company added. Typical applications include high-speed spindles, textile machinery, lasers, military appliances (400Hz), HVAC applications, pumps, ventilators, conveyors, compressors, elevators, cranes, step-up transformers, motor drives with multiple motors, and motor drives with long motor cables.
A full product line is available to accommodate a wide range of switching kHZ, and voltage ratings up to 690vac. Model FN5020 and FN5040 Sine Wave filters are offered as open and enclosed.