Product Description:

The HMF01.1N-N0K2-C0303-A-500-NNNN belongs to the HMF Motor Filters series from Bosch Rexroth Indramat. Intended for installation between a converter and a motor, this passive unit suppresses the high-frequency components that arise during pulse-width-modulated operation. By smoothing the output waveform, it helps keep motor insulation stress within allowable limits and reduces conducted electromagnetic emissions in densely wired industrial automation cabinets where several inverters operate side by side.

The filter is rated for a continuous line current of 303 A, so it can be used with high-power drive axes without core saturation. It is designed for a supply backbone of 3 AC 400 V, matching the common three-phase utility voltage used in European and North American plants that run isolated transformer secondaries. The design permits motor excitation up to 200 Hz, which covers most constant-torque and field-weakening speed ranges. Internally, the inductive network is optimized for a converter carrier frequency of 2 kHz. Under these operating conditions, the filter restrains the voltage gradient to <1 kV/µs, helping prevent premature dielectric aging along long motor cables.

Additional protection is provided by a peak differential-mode ceiling of 1,000 V Max, which limits reflected-wave overvoltage during cable resonance events. The module mates directly with converters classified as HCS03 and HCS04, allowing proper mechanical alignment with those drive platforms. Because the specified installation point is the Converter Output, the filter should be mounted as close as possible to the inverter terminals to minimize loop inductance. Its designation as a Motor Filter distinguishes it from sine or du/dt chokes that are installed on the mains side.