Product Description:

The KDA 3.2-100-3-AQI-U1 spindle drive is produced by Bosch Rexroth Indramat as part of the KDA Spindle Drives series. It serves as a dedicated power amplifier between a common DC bus supply and the three-phase spindle motor used on machining centers, grinders, and similar equipment. By accepting an analog velocity reference from the numerical controller, the unit regulates current and voltage so that the motor can follow precise speed profiles during cutting or finishing operations. The unit is hardware release 3 and version 2, which matches the corresponding supply modules, feedback cards, and diagnostic tools in the same generation.

The drive is energized by a DC link of 300 VDC, and its power section delivers a continuous phase current of 100 A to the spindle windings, allowing high torque at low speed and rapid acceleration to rated speed. An integral heat sink assembly is cooled by a blower supplied with 115 V at 50–60 Hz, and this airflow supports the stated duty cycle under heavy chip-load conditions. The thermal design uses forced cooling with a heat sink-mounted blower, so the cabinet only needs clearance for outlet air rather than liquid cooling or external fan packs. This arrangement keeps semiconductor temperatures within acceptable limits while the analog speed loop responds quickly to command changes.

Cabinet installation is permitted where ambient air remains between 5–45 °C and where the site is no more than 1000 m above sea level; operation outside these limits requires output-current derating. The velocity channel accepts an analog speed command that is filtered and scaled internally before being sent to the current regulators. An incremental encoder output passes spindle position data to external motion controllers for synchronous tapping, probing, or orientation tasks.