Product Description:

The KDA 3.1-050-3-DYD-W1 spindle drive is produced by Bosch Rexroth Indramat as a member of the KDA Spindle Drives series. It converts the fixed DC link voltage supplied by the cabinet into a three-phase output for high-speed machine tool spindles. Integrated gate-controlled converters and feedback channels let the drive match spindle speed to program commands while maintaining the torque needed for cutting, drilling, and grinding tasks. Because the unit regulates output frequency and current together, it can support both commanded speed changes and torque demand during acceleration or changing cutting loads.

At the power stage, the drive operates from a DC bus of 300 VDC, and the output is modulated to match the spindle's electrical requirements. Continuous output is limited by a rated phase current of 50 A, so associated protection devices must be selected for that load level. To remove switching losses, the housing includes a mounted heat-sink blower. The blower uses an auxiliary supply of 220 V/50-60 Hz and moves air through the fins under forced cooling. This airflow helps keep the power semiconductors within their intended operating temperature range during sustained spindle duty, and cabinet air must be able to move heat away from nearby components.

The permissible ambient range is 5 to 45 °C, and operation is supported at elevations up to 1000 m above sea level. Speed commands are delivered through a digital 16-bit parallel interface, and a separate line can carry a position command for coordinated machining functions. The drive also includes a second encoder input and synchronous input, so the controller can accept incremental or absolute feedback for spindle orientation, threading, or rigid tapping. Using both command and feedback signals, the unit can coordinate spindle position with feed motion in operations that require accurate angular alignment at the tool interface.