Product Description:

The KDA 3.1-100-3-DQ0-U1 spindle drive is produced by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. Designed for high-speed machining centers, the unit converts a regulated DC bus into three-phase output for synchronous or induction spindles while housing its own heatsink blower. Within an automation cabinet, it interfaces with the drive controller stack and supplies current to the attached motor so that rapid acceleration, controlled braking, and stable speed loops can be achieved during milling, drilling, or grinding operations. This arrangement supports spindle service in machine tools that must move quickly between idle speed, tool engagement, and sustained cutting without losing rotational stability.

This drive draws auxiliary blower power from a separate 115 V, 50–60 Hz AC tap, which keeps cooling performance independent of spindle load. Power for the inverter arrives on a shared 300 VDC intermediate circuit that can also supply other KDA modules in the same cabinet. Under rated conditions, the drive can deliver 100 A of continuous output current for large-diameter tool acceleration and steady cutting duty. Thermal management relies on forced cooling delivered through a mounted heat sink blower, which removes waste heat from the finned extrusion during sustained operation. The separate blower supply also helps maintain consistent airflow when spindle demand changes rapidly during repeated speed shifts.

The permissible ambient temperature range is 5 to 45 °C, which suits typical enclosed industrial cabinets with controlled airflow. Installation is permitted up to 1000 m above sea level without power derating, allowing use in most standard plant locations. Speed commands are accepted as a digital 16-bit parallel word, allowing precise velocity references without analog drift when the controller changes spindle setpoints. The drive has no additional interface option, so its terminal points remain fixed in the standard configuration.