Product Description:

The KDA 2.1-100-3-APD-W1 spindle drive is manufactured by Bosch Rexroth Indramat within the KDA Spindle Drives series, release 2. It operates as the axis-specific power stage that energizes and regulates a machine-tool spindle from a shared DC bus. By shaping current and voltage in real time, the drive allows numerical control systems to vary spindle speed, hold commanded torque, and execute orientation moves required for tool changes or tapping cycles. Its hardware layout supports auxiliary encoder feedback so the controller can maintain tight speed precision during rapid load fluctuations.

The drive accepts a DC link of 300 VDC, so it must be paired with an Indramat supply module delivering that nominal voltage level. Internal IGBT bridges can conduct up to 100 A of continuous armature current, giving the spindle high acceleration torque without saturating the power stage. Thermal losses are discharged through a mounted heat sink blower; the fan receives its own 220 V / 50–60 Hz source and expels air directly across the fins. Because the airflow is actively forced, the unit is classified for Forced cooling, letting it sustain rated current while cabinet temperatures climb during long machining cycles.

Permitted ambient operation spans 5–45 °C, and functionality is guaranteed up to 1000 m elevation without derating, which aligns with typical shop-floor installations. Command structure combines a non-contact resolver or incremental encoder at the dedicated second encoder input and a numerical control that issues velocity through an analog speed command input; an additional interface carries the position command value in digital form for orienting or synchronized spindle tasks. These signal paths allow the drive to follow fine motion profiles during orientation and synchronized spindle tasks.