Product Description:

The KDA 3.2-050-3-LPI-W1 spindle drive is produced by Bosch Rexroth Indramat within the KDA Spindle Drives series. As a closed-loop power stage, it converts DC bus energy into three-phase output for high-speed machine tool spindles while maintaining commanded velocity and torque under load. By combining digital speed commands with encoder feedback, the unit supports accurate cutting processes in automated milling, drilling, and grinding equipment. Its control structure helps keep spindle speed stable when cutting conditions change during operation.

The drive section is powered from a direct bus of 300 VDC, allowing it to share energy with other axes in a common cabinet. Its inverter supplies a continuous phase current of 50 A, which suits medium-frame spindle motors that require strong acceleration torque. A dedicated blower runs from an auxiliary feed of 220 V/50–60 Hz, so cooling airflow remains available even during DC-link discharge. Speed commands arrive through the deterministic SERCOS interface, which supports stable digital communication and avoids analog drift. Reliable operation is intended for ambient temperatures from 5 to 45 °C, covering typical shop-floor conditions without added refrigeration. This arrangement allows the drive to operate in coordinated systems where several motion components share the same enclosure.

Thermal regulation relies on a mounted heat sink blower that directs air across the power modules. It operates with forced cooling to help control internal temperature during extended cutting duty. Full output is available at elevations up to 1000 m above sea level without derating. The control section also provides an incremental encoder output for downstream devices that need speed-related or position-related signals. A separate second-encoder connection supports additional feedback channels when spindle orientation or related axis functions must be monitored independently.