Product Description:

The KDA 3.2-050-3-API-W1 spindle drive is manufactured by Bosch Rexroth Indramat as part of the KDA Spindle Drives series. It uses hardware series code 3 and design version 2 for identification within that product line. In an industrial machining center, the drive converts a regulated DC bus into three-phase output for a motorized spindle, follows external velocity commands, and works with encoder feedback to maintain stable surface speed during drilling, grinding, or milling. That control behavior helps the spindle hold the commanded speed when cutting load changes during a machining cycle.

The power section operates from a DC link of 300 VDC, a level derived from a shared rectifier that keeps the bus voltage stable for multiple axes. Its continuous output capability is 50 A, which is the maximum spindle current the unit can supply without derating. Thermal energy is expelled through a heat sink-mounted blower on the backplate, and airflow across the fins helps keep the power semiconductors within their normal operating range. Speed reference data enters as an analog command, so the drive can respond to proportional control signals from conventional CNC systems. For position synchronization, the front panel provides an incremental encoder output that mirrors spindle position to auxiliary controls or monitoring equipment.

The blower is supplied from an auxiliary circuit rated at 220 V/50–60 Hz, so the cooling connection requires a separate single-phase source. Because the unit uses forced cooling, it can maintain full current in enclosures where natural airflow is limited. Operation is permitted at ambient temperatures from 5 to 45 °C, and installation is allowed up to 1000 m above sea level before derating is required. A dedicated second encoder input is also available for spindle feedback or for an additional motor sensor in multi-motor arrangements.