Product Description:

The HMF01.1N-N0K1-M0760-N-690-NNNN is a passive motor-side filter produced by Bosch Rexroth Indramat in the HMF Motor Filters series. Installed between an IndraDrive inverter and the motor leads, it moderates voltage rise times, reduces common-mode noise, and protects winding insulation during variable-frequency operation in industrial automation. Because it uses passive magnetic components, the unit conditions the inverter output without requiring separate control electronics. It is used where long motor cables or fast-switching PWM outputs can place extra stress on motor insulation systems.

For three-phase output up to 690 V AC, the filter covers the working range of standard converters and supports both low- and medium-voltage machines without retapping. At ambient temperatures up to 50 °C, it carries a nominal phase current of 759 A. Its laminated core supports overloads of 150% for 60 s every 10 min and 165% for 2 s, so the drive can deliver high starting torque during short demand peaks. The coils release 600 W of heat at rated load, so cabinet airflow is required, and the open-frame construction with an IP00 rating requires installation inside a grounded enclosure. Across the 0 to 100 Hz operating bandwidth, the choke impedance remains nearly linear, which helps limit motor voltage stress across the inverter PWM spectrum.

The steel frame has a mass of 93 kg, and the footprint remains limited to 210 mm in width, 250 mm in depth, and 315 mm in height for cabinet mounting. This size leaves room for adjacent drives and cable routing on 600 mm deep panels. Internally, three single-phase chokes are potted to withstand shocks of 15 g for 11 ms and vibrations of 1.5 mm at 3–13 Hz and 1 g at 13–200 Hz, which suits mobile or gantry-mounted cabinets. Potted construction also helps hold the windings in place under repeated vibration. Rated performance is maintained from sea level to an installation altitude of 0–1000 m; above that range, current must be derated to control temperature rise. Storage from -40 °C to +70 °C is permitted without harming the insulation.