Product Description:

The KDA 3.2-100-3-DQD-U1 is a spindle drive produced by Bosch Rexroth Indramat within the KDA Spindle Drives series. Acting as a power module for synchronous or asynchronous spindle motors, it links the shared DC bus of a machine tool to a high-speed spindle and converts numerical control commands into regulated torque and velocity. By closing current and speed loops in real time, the unit enables accurate milling, drilling, and grinding processes. It is suited to machine tools that require stable spindle control during changing cutting loads.

This KDA model runs from a bus voltage of 300 VDC, and its output stage can supply up to 100 A of continuous current to the motor. Thermal energy created by switching losses is removed by a mounted heatsink blower that channels air across the finned aluminum heat sink. Airflow is governed by the drive’s forced cooling mode, which helps stabilize component temperatures during prolonged heavy-duty cycles. The blower motor is powered from an auxiliary feed of 115 V/50–60 Hz, so the installation must provide this single-phase source alongside the DC link. This auxiliary supply keeps the cooling system operating independently of the main bus voltage.

Motion commands are processed digitally. A 16-bit parallel digital speed-command bus transmits velocity words with fine resolution, while a separate digital position command value interface can be used when spindle orientation must be synchronized to the machining cycle. This supports orientation during tool changes and other coordinated machine movements. The unit maintains rated performance in ambient conditions from 5 to 45 degrees Celsius, and it can be installed at elevations up to 1000 m above sea level without added cooling. Within this operating range, the controller handles current, speed, and diagnostic routines for integration into multi-axis Indramat automation systems.