Product Description:

The KDA 3.1-100-3-DQD-U1 is a spindle drive produced by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. As a Series 3 variant, the unit controls high-speed machine-tool spindles by converting a fixed DC bus into regulated three-phase outputs in closed-loop motion systems. It interfaces with a CNC or PLC to set rotational velocity and positioning so that automated cutting, drilling, or grinding processes receive stable torque across the required speed range. This allows the drive to support both speed-controlled spindle operation and indexed spindle positioning when the process requires angular alignment.

Electrical parameters describe how the drive connects to the central power supply and control hardware. Its continuous output capability is rated at 100 A, meaning the internal IGBT bridge can deliver that current to the spindle motor without derating. The common DC bus delivers 300 VDC, providing the energy that the converter modulates for acceleration and constant-speed operation. Velocity reference data enter through a 16-bit parallel digital channel, while position loops may be closed over a separate digital position command interface. These parallel ports allow deterministic updates with minimal conversion latency. Thermal management for the power section relies on an integral blower that takes an independent AC supply of 115 V/50-60 Hz, so airflow is maintained even when the DC bus is inactive.

Mechanical features and operating limits support reliable mounting inside standard control cabinets. The power semiconductors are assembled on a large fin assembly that is cooled by a mounted heat sink blower; this arrangement uses forced cooling to keep junction temperatures within safe limits during rapid load cycles. Acceptable ambient conditions range from 5 to 45 °C, so no additional conditioning is needed for typical factory floors. Installation is permitted up to 1000 m above sea level, preventing voltage derating for most production plants.