Sinus filters, as the name suggests, are used to convert the output voltage of the frequency converter into a sinusoidal voltage. Frequency converters generate high electrical interference signals on the motor cable, which not only disturb the load, but also increase the insulation load on the motor. A sine-wave filter, which reduces these interfering signals, provides a remedy. In addition, the voltage peaks are attenuated as well as the electromagnetic compatibility (EMC), which promises a longer service life. The filters are connected between the frequency converter and the motor in the motor cable. Compared to a line filter, the sinusoidal filter has a low cut-off frequency.
What are Sine wave filter for?
The sine filters are distinguished by their excellent film winding structure due to low DC resistances, strong resistance to electromagnetic force and high short-term overload capability. With class F insulation, the filter promises reliable performance even under severe operating conditions. The high insulation capability can maintain high Du / Dt voltage pulses to the reactor. The sine filters are suitable for frequency converters with the power classes from 5.5 kW to 500 kW with a voltage of 400 V.