Product Description:

The KDA 3.1-100-3-A0D-U1 spindle drive is manufactured by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. Installed in a modular CNC cabinet, it converts the shared DC bus into regulated three-phase output for the machine-tool spindle, giving the controller precise authority over rotational speed and torque. As a dedicated axis converter, it links numerical control commands to the electromechanical spindle assembly that performs cutting, drilling, or grinding tasks in automated production lines.

A dedicated auxiliary supply at 115 V/50–60 Hz feeds the internal cooling circuit, allowing airflow to start before the DC link is energized. The power stage references a bus of 300 VDC and can continuously deliver 100 A, a capacity sized for medium-power spindles in machining centers and woodworking lines. Reliable operation is declared for ambient temperatures from 5 to 45 °C, limiting the need for cabinet air-conditioning on most shop floors. The drive may be installed up to 1,000 m above sea level without adjustment, so identical parameter sets can be used across plants at moderate elevations.

Thermal management relies on a mounted heat sink blower that forces air through the rear fin channels; this hardware works with the unit’s forced cooling mode to stabilize semiconductor temperatures during prolonged roughing passes. Speed reference data reach the control board as an analog command, while a parallel interface handles a digital position command value, enabling controllers that separate velocity and interpolation loops. Because the Series 3 hardware does not provide a second encoder input, spindle feedback must be routed through the primary sensor only. This arrangement supports separate control loops while helping the drive maintain stable internal temperatures during extended spindle operation.