Advantages of a SineFormer solution compared with other output filter solutions using examplary measurements
Frequency converter without output filter
High-frequency interference requires a shielded motor cable.
Frequency converter with dv/dt choke
Steep current and voltage rises at the output of the frequency converter are evened out by the inductance, while the parasitic capacitances of the motor cable are charged and discharged less powerfully. Motor chokes are used mainly for protecting motor windings against voltage spikes.
Frequency converter with sine-wave filter
Sine-wave filters are designed as LC filters. Unlike motor chokes, however, their limit frequency, lies between the output frequency and the converter clock speed. As the sine-wave filter mainly suppresses the symmetrical interference between the lines, the interference acting on the phase-to-ground voltage is hardly reduced at all. Therefore, the motor leads still require shielding. Sine-wave filters reduce the motor noise and the eddy current losses and permit the use of motor leads much longer than 100 m.
Frequency converter with SineFormer
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