Product Description:

The HMF01.1A-N0K2-D0045-A-500-NNNN motor filter is manufactured by Bosch Rexroth Indramat as part of the HMF Motor Filters series. Positioned between a pulse-width-modulated inverter and its connected servo motor, this component smooths the steep voltage flanks that arise during switching events. By limiting differential and common-mode disturbances, it helps protect motor insulation systems and lowers conducted emissions inside industrial automation cabinets.

The filter accepts an inverter carrier frequency up to 4 kHz, so it can be paired with standard Rexroth drive controllers without excessive core heating. During steady operation, it carries a continuous phase current of 45 A. This is the maximum RMS load each phase can handle continuously while keeping the windings within their thermal limits. For short acceleration bursts, the device tolerates up to 70 A of output current, giving drives headroom for transient torque demands. Its output terminals withstand line-to-line voltages as high as 1.2 kV, which supports safe operation when long motor cables cause reflected-wave overvoltages. The energy-storage element consists of three series inductors with 3 × 160 µH of inductance, which helps attenuate high-frequency components without introducing excessive voltage drop at nominal fundamental frequencies.

The enclosure carries an IP10 degree of protection, so it must be mounted in a closed control cabinet that shields users from live parts. Internally, the magnetic cores are sized so that losses remain within a thermal envelope of 120 W, permitting natural convection through the 330 mm × 125 mm × 270 mm housing. When paired with motors running up to 200 Hz, the inductive reactance stays low enough to avoid significant phase displacement. The output lugs use M6 connections with a tightening torque of 1.5 Nm, and the terminals accept conductors up to 6 AWG (16 mm²). Once wired, the assembly adds a manageable 15 kg to the panel mass.