Schaffner EMC recently introduced a new lineup of Sine Wave filters designed to eliminate premature motor damage caused by high dv/dt, overvoltages, cable ringing, motor overheating and eddy current losses caused by Variable Frequency Drives (VFD). Suitable for motor frequencies up to 600Hz, this technology converts the rectangular PWM output voltage of motor drives into a sine wave with low residual ripple. In addition, Schaffner Sine Wave filters eliminate circulating bearing currents. 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 switching kHz and voltage ratings up to 690vac. Motor frequency can manage typically 60Hz equipment and higher speed 600Hz, with application engineered design for even higher frequencies. Model FN5020 and FN5040 Sine Wave filters are offered as open and enclosed. Available for motors up to 200 HP (UL508C) over 200 HP to 800 HP (UL pending).