Product Description:

Bosch Rexroth Indramat manufactures the KDA 3.2-100-3-LYI-W1 within the KDA Spindle Drives series, release 3, version 2. This spindle drive converts regulated DC power into three-phase output for high-speed machine tool spindles, allowing precise speed and torque control during cutting, grinding, or drilling. The unit receives position and speed data from primary and secondary encoders and uses the drive controller to execute closed-loop regulation that keeps the spindle synchronized with the wider CNC system.

The drive draws blower power from an AC auxiliary source rated at 220 V/50–60 Hz, so the cooling fan can operate independently of the DC link. Its main power electronics are supplied by a link voltage of 300 VDC, which stabilizes the pulse-width-modulated output even when mains conditions fluctuate. A continuous motor phase capability of 100 A is the maximum permissible spindle current before overload shutdown occurs. Heat generated by the IGBT stack is removed through a heat sink-mounted blower, and the airflow is intensified by forced cooling to keep semiconductor junction temperatures within safe limits during prolonged high-duty machining cycles.

Installation is permitted up to 1000 m above sea level without derating, allowing full output in most factory settings. Reliable startup and thermal behavior are maintained within an ambient range of 5 to 45 °C, which matches typical shop floor conditions. The commanded spindle velocity reaches the control board through a SERCOS interface, enabling deterministic communication with the numerical controller. For auxiliary feedback or master-slave synchronization, an additional channel provides an incremental encoder output, while a second encoder input with synchronous reference supports dual-loop applications that require higher positional accuracy.