Product Description:

The KDA 3.2-050-3-D00-W1 spindle drive is built by Bosch Rexroth Indramat as part of the KDA Spindle Drives series. Serving as version 2 of the third series generation, it interfaces with a common DC bus to run high-speed machine-tool spindles under digital CNC control. By modulating current and voltage delivered to the motor windings, the unit converts motion commands into tightly regulated spindle speed and torque for drilling, milling, and grinding applications that require consistent surface finish and cycle accuracy. In machine tools, this supports speed-controlled spindle service where commanded rpm and torque must remain stable through repeated production cycles. This control behavior also helps the spindle respond predictably when cutting load changes as the tool enters, exits, or moves across the workpiece.

Its power electronics are energized from a DC link of 300 VDC, and the current stage can continuously supply 50 A to the connected motor. The integral heatsink blower uses an auxiliary supply of 220 V/50–60 Hz. Thermal stability is maintained through forced cooling, so internal semiconductors stay within their intended operating range during sustained cutting loads. Because the blower is mounted directly on the rear heatsink, the cooling path is concentrated at the drive instead of relying entirely on general cabinet ventilation. The drive also accepts digital speed words, which keeps command timing deterministic across the motion system and supports steady spindle response under changing machining demand.

Installation height must not exceed 1000 m above sea level, and ambient temperature must remain between 5 to 45 °C during operation. The velocity reference arrives as a digital 16-bit parallel value, which removes analog offset and supports multi-axis synchronization. Using a digital reference instead of an analog signal also reduces susceptibility to drift in the command path, which helps preserve repeatable spindle behavior over long operating periods. A fixed interface layout is used because there is no additional interface option. The unit also has no additional input for a secondary encoder.