Product Description:

The KDA 3.1-100-3-AYS-W1 spindle drive is produced by Bosch Rexroth Indramat within the KDA Spindle Drives series. Intended for machine-tool spindles, the unit converts a regulated DC bus into variable three-phase output so that high-speed machining heads can follow numerical control commands with minimal lag. The drive mounts in a multi-axis cabinet and cooperates with companion modules to coordinate torque and velocity loops for industrial automation tasks.

The drive accepts a DC bus of 300 VDC, and its power stage is rated for 100 A of continuous output current, enabling it to drive large frameless motors during heavy cutting passes. The integrated heatsink blower is energized from 220 V/50-60 Hz, isolating cooling power from the DC link for stable thermal management. This arrangement helps keep airflow active and heat removal stable when spindle demand changes rapidly during machining cycles. Command inputs are analog, so the speed reference arrives as an analog voltage that the internal regulator converts into a firing pattern for the IGBT bridge. Diagnostic and parameter exchange occur through a serial interface (RS-232C) on the front panel, allowing host PC tuning without fieldbus hardware.

Environmental limits support long-term operation. Forced convection is maintained by forced cooling, which keeps semiconductor junctions below derating thresholds when the ambient temperature stays between 5 to 45 degrees Celsius. Installation is permitted up to 1000 m above sea level without current reduction, matching standard factory elevations. Motion feedback versatility is added through a second encoder input and a synchronous input, giving the controller a direct spindle-oriented position channel alongside the primary encoder. Within Series 3 hardware, this additional port allows real-time phase matching between master and follower spindles during synchronized tapping or orient functions.