Product Description:

The HMF01.1N-N0K1-M0320-N-690-NNNN is a motor output filter manufactured by Bosch Rexroth Indramat for the HMF Motor Filters series. Mounted on the DC-bus side of an IndraDrive power section, it mitigates the steep switching fronts that occur in pulse-width-modulated drives, protecting motor insulation and reducing conducted electromagnetic interference in industrial automation lines.

This filter is designed for networks rated at 3 AC 400 V and can conduct a continuous line current of 314 A without exceeding its thermal limits. The internal LC topology is tuned to the inverter’s carrier, which is specified on a 4 kHz clock frequency basis, so attenuation aligns with the dominant switching harmonics. To safeguard motor windings, the filter limits the peak phase-to-phase voltage to 1,000 V and restricts the voltage rise slope to 1 kV/µs; both parameters curb partial-discharge phenomena that shorten insulation life. The construction supports a fundamental motor frequency up to 200 Hz, allowing high-speed servo operation without detuning.

During operation the unit converts switching losses into heat, and its laminated core and film capacitors dissipate up to 475 W, so cabinet airflow must evacuate this load continuously. The maximum output frequency handled is 200 Hz, providing adequate bandwidth for rapid positioning cycles. Mechanical data ease enclosure planning: the housing is 250 mm deep, 110 mm wide, and 210 mm high, compact for a filter in this current class. A mass of 32 kg offers sufficient thermal inertia while still allowing single-person installation with lifting aids.