Product Description:

The KDA 2.1-050-3-AQD-W1 is a spindle drive module produced by Bosch Rexroth Indramat for the KDA Spindle Drives series. It forms the power stage between a CNC controller and a high-speed motor, regulating torque and velocity during machining, grinding, or drilling operations. By converting regulated DC bus energy into three-phase output while monitoring feedback, the unit supplies precise motion profiles required by industrial automation equipment such as machine-tool spindles, positioning tables, and other production machinery that needs rapid, repeatable rotational control.

Electrically, the module operates from a stabilized DC bus of 300 VDC supplied by the cabinet power supply. Its output stage is dimensioned for a continuous phase current of 50 A, allowing it to accelerate large-inertia spindles without excessive heating. A separate blower mounted directly on the heat sink receives 220 V AC at 50–60 Hz, and this dedicated supply keeps semiconductor temperatures within safe margins under sustained load. The cooling hardware is physically integrated as a mounted heatsink blower, and speed reference signals enter the regulator as an analog speed command, enabling proportional velocity control from external CNC channels.

The drive is designed for forced cooling, so airflow supplied by the blower supports stable thermal operation when the cabinet reaches an ambient temperature of 5 to 45 °C. Installation is permitted up to 1000 m above sea level without power derating, which supports machinery located on mezzanine floors or other elevated production areas. In addition to the analog velocity loop, a dedicated interface accepts a digital position command value, giving the machine control a way to synchronize spindle orientation with tool changers or probing cycles. This arrangement supports applications that need both continuous speed regulation and controlled angular positioning during automated process sequences.