Chokes designed for the output side of frequency converters

The chokes are suitable for motor cables with a length of up to about 100m at motor frequencies of 0Hz to 400Hz. The smaller versions are designed for a maximum switching frequency of 16kHz, whereas this drops to 2.5kHz for types with current capabilities exceeding 500A. Corresponding to the IEC 60076-6 standard, all types of the new series are manufactured with the UL-approved T-EIS-CF1 electrical insulation system.

Motor chokes are longitudinal chokes, through which the total motor current flows. Their inductance flattens the steep current and voltage edges at the output of the frequency converter so that the parasitic capacitances of the connected motor cables are less strongly charged and discharged. Motor chokes are used mainly to protect the motor windings from voltage peaks.