Product Description:

The DM 045K 1101-D servo drive is manufactured by Bosch Rexroth Indramat and belongs to the DM Servo Drives series. The module functions as a compact power converter that regulates motor current and velocity inside industrial handling equipment, packaging lines, and conveyor systems. It accepts setpoints through the SERCOS interface and passes position information from the standard encoder channel back to the motion controller, forming a closed feedback loop that keeps axis dynamics within commanded tolerances. This arrangement helps the axis react quickly to load changes during positioning moves, synchronized transport, and repeated start-stop motion.

Control electronics inside the unit draw 1.4 A from the 24 V auxiliary supply, and this low-power rail keeps the gate drivers and logic active even when the main bus is de-energized. Heat generated by the IGBT stages is removed through air cooling, so the cabinet must provide continuous airflow across the integrated heat sink. Keeping that airflow path open helps the drive maintain stable operation during continuous duty. Under a 4 kHz switching frequency, the closed-loop channel can provide 23.5 Arms, while raising the frequency to 8 kHz reduces the steady-state capability to 16.5 Arms because switching losses increase. The intermediate bus floats at 715 VDC in the non-regulated mode, storing kinetic energy from regenerative braking and supplying it back to the load during the next acceleration cycle.

During brief overload periods, the same 4 kHz configuration can furnish 47.5 Arms, giving the axis additional torque for rapid indexing, direction changes, or unplanned shock loads. Thermal modeling shows that the drive will dissipate up to 205 W, and current derating is listed as 0.6 A/K at 4 kHz and 0.5 A/K at 8 kHz. Physical integration is eased by a frame width of 75 mm, and the compact mechanics keep total mass to 6.7 kg for simple rail mounting. When the internal regulator is engaged, the DC link is held at 670 VDC, which helps stabilize current response during dynamic command changes. The regulated DC-link condition also supports more consistent behavior when the load alternates between acceleration and regeneration.