Product Description:

The HMF01.1N-N0K1-M1190-N-690-NNNN is a passive motor filter from Bosch Rexroth Indramat's HMF Motor Filters series. Positioned at the output of a servo or spindle drive, it reduces steep voltage edges and common-mode currents that stress motor insulation and generate electromagnetic interference. By conditioning the pulse-width-modulated waveform, the unit protects connected motors and cables in automated machinery cells.

For attenuation, the core assembly consists of 3 Single-Phase Chokes, allowing each phase to be treated individually and minimizing coupling between lines. Under continuous duty, the filter carries 1188 A, matching large multi-motor buses without saturation. It is intended for a 3 AC 400 V supply, so its winding insulation and clearances follow that mains level. The cores withstand repetitive switching transients up to 1000 V, aligning with modern IGBT inverter peaks. During operation, the iron and copper losses add up to 680 W, so adequate cabinet airflow or separate heat sinking is required. With an enclosure classification of IP00, the unit must be mounted inside a protected electrical cabinet to avoid accidental contact or contamination.

The filter frame tolerates mechanical impacts of 15 g for 11 ms, permitting installation on moving gantries or machines subject to short shocks. Its differential inductance limits the dV/dt at the motor terminals to <1 kV/µs, which keeps partial-discharge activity within acceptable ranges for standard insulation systems. The laminated steel stack and copper windings bring total weight to 120 kg, so the 370 mm-high, 250 mm-deep, and 230 mm-wide assembly requires a rigid panel or floor mounting plate. A touch guard is included to shield energized components while still allowing convection cooling around the open core.