Product Description:

The HMF01.1N-N0K2-M0028-A-500-NNNN is a three-phase motor output filter produced by Bosch Rexroth Indramat within the HMF Motor Filters series. Installed between an IndraDrive inverter and an induction or synchronous motor, the unit limits steep voltage edges and reflected-wave stress that can occur on long feeder cables. By smoothing the drive’s pulse-width-modulated output, it helps protect motor insulation and reduce electromagnetic interference inside industrial automation cabinets and machine frames. This arrangement is especially useful when cable length or switching frequency would otherwise increase electrical stress at the motor terminals.

The filter carries a continuous load current of 28 A, so it can be paired with drives whose rated motor phase current does not exceed that value. Its iron-cored chokes provide a total inductance of 3 × 450 µH, which attenuates high-frequency components and lengthens the voltage rise time at the motor terminals. Operation is specified for 3 AC 400 V, matching standard three-phase supply systems used on many production floors. To reduce insulation stress, the internal design limits the slew rate to <1 kV/µs and keeps peak amplitudes to 1,000 V Max during switching events. These limits help protect 400 V class motor windings from excessive terminal voltage stress and support cleaner inverter-to-motor power delivery.

Steady-state power dissipation is 50 W, so the enclosure must allow enough airflow or heat transfer to prevent excessive coil temperature rise during operation. The assembly has a mass of 11 kg, which means the mounting surface must support the unit securely under static load and normal machine vibration. The housing is 130 mm deep and 210 mm wide, with a height of 182 mm, allowing installation beside compatible drive components in control enclosures. Its compact proportions help preserve routing space for adjacent wiring while keeping the connection path between the inverter, filter, and motor as short as practical. That layout can also help maintain orderly cabinet organization where multiple power components share the same panel.