Sinusoidal filter for frequency inverter, has inductor with core that contains iron powder and current-dependent inductance characteristics that serves as series choke

摘要

The filter has a series choke (5), using an inductor with current-dependent inductance characteristics. The inductor has a core that contains iron powder. The filter is arranged downstream of a frequency inverter, where the longitudinal inductor and a capacitor network (6) are so arranged that the current in the series inductor exceeds the value required to reduce its inductance and resonance effects are suppressed.