LC / sinusoidal filters
LC or sinusoidal filters have almost the same configuration as L (inductive) C (capacitive) filters.
Differences between the two filters consist in the distortion factor. Since there are no standards limiting distortion in sinusoidal filters, it is allowed to name every filter as sinusoidal filters which have a sinusoidal output voltage waveform.

The sinusoidal filter reduces the additional motor stresses, as a result of the following
- it generates an almost sinusoidal motor voltage and an absolutely sinusoidal motor current,
- reduces the voltage rate of rise (gradient) at the motors terminals to values dv/dt << 500 V/µs,
- prevents transition voltage spikes at the motor terminals,
- reduces the supplementary losses in the motor, and
- reduces the motor noise.

At the same time for long motor cables, the sinusoidal filter reduces the charging current spikes that at additionally stress the drive inverter as a result of the periodic recharging of the cable capacitances.