Product Description:

The KDA 3.1-100-3-AQI-W1 spindle drive belongs to the KDA Spindle Drives series from Bosch Rexroth Indramat. Designed to regulate high-speed induction or permanent-magnet spindles, the unit converts the fixed DC-link voltage from the supply module into controlled three-phase output for machining centers, grinders, and similar automation cells. By integrating current, speed, and position loops, the drive maintains a stable torque profile for precise metal-cutting and drilling operations. Its control architecture and feedback interface support reliable operation in enclosed electrical cabinets.

Continuous output demands are handled through a rated phase current of 100 A, allowing the drive to energize large spindle motors without derating. Power for the inverter section is taken from a 300 V DC bus, so the module is typically paired with matching supply units in Indramat drive racks. The auxiliary cooling fan operates from a dedicated 220 V, 50/60 Hz source, which keeps thermal management independent of DC-link variations. Safe operation is specified between 5 to 45 °C, and staying within this range helps preserve semiconductor life and limit parameter drift. A mounted heat sink blower directs air across the power transistors to remove junction heat during sustained duty cycles.

Because the enclosure relies on forced cooling, cabinet airflow planning must ensure an unobstructed exhaust path. Position feedback can be passed to the CNC controller through the drive’s incremental encoder output, eliminating the need for separate splitter modules. Installation altitude is limited to 1000 m above sea level, because reduced air density above this height impairs heat removal and may require current derating. Speed reference signals are accepted as an analog command, allowing straightforward connection to legacy control cards that provide ±10 V speed setpoints.