Sine Wave Filters
By Design Engineering staffMotion Control Machine Building Schaffner
Schaffner sine wave filter series for VFDs saves motors from premature damage.
Schaffner EMC introduced a lineup of Sine Wave filters that 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, the filter converts the rectangular PWM output voltage of motor drives into a smooth sine wave with low residual ripple. The company’s full product line accommodates a wide range of switching kHZ, and voltage ratings up to 690vac. Motor frequency can manage typically 60hz equipment and higher speed 600hz. Filters are available for motors up to 200 HP and 200 HP to 800 HP (UL pending).