The V1K is a very effective dV/dt filter and will provide excellent protection for your motor when use on a PWM, variable frequency drive. The output waveform will show a notable reduction in the magnitude of the voltage excursions found on a conventional drive output waveform. It is designed to limit the voltage spikes to 1000 volts per u Second or less and our tests indicate it is very effective at that goal. It is not however, a sine wave filter and it does not return the drive output square wave to a smooth sine wave profile. For this type of performance on the output of the VFD, we recommend you consider using the TCI, KMG MotorGuard Sine Wave Filter.