Schaffner EMC
This company’s Sine Wave Filter products eliminate premature motor damage from overvoltages, cable ringing, motor overheating and eddy-current losses caused by variable frequency drives (VFDs). Suitable for motor frequencies up to 600 Hz, this technology converts the rectangular pulse-width modulation (PWM) output voltage of motor drives into a smooth sine wave with a low residual ripple. In addition to elongating the service life of high-speed motors, the Sine Wave filters can improve bearing life by eliminating circulating bearing currents. Typical applications include pumps, conveyors, compressors, HVAC applications and motor drives with multiple motors or long motor cables. — Schaffner EMC Inc., Edison, N.J.