Product Description:

The KDA 2.1-100-3-DPD-W1 spindle drive is built by Bosch Rexroth Indramat as part of the KDA Spindle Drives series. It functions as a dedicated power stage for machine-tool spindles, converting regulated DC-link energy into a three-phase output that follows digital velocity commands. In automated cells, it supports rapid acceleration, constant surface speed cutting, and controlled braking so spindle motion stays coordinated with axis movements from the CNC controller. This operating role makes it suitable for spindle applications that require steady speed control during changing machining conditions.

Internally, the drive operates from a link voltage of 300 VDC and can furnish up to 100 A of continuous phase current to the motor windings. Thermal loading is addressed through a mounted heat sink blower that moves air across the power semiconductors, and the blower is supplied from a separate 220 V, 50/60 Hz source. Because cooling air is forced, the unit can maintain its full current capability even when mounted in dense electrical cabinets. Separate blower power keeps the cooling circuit independent of the main power section during operation. Speed reference data arrive over a 16-bit parallel digital channel, allowing the controller to issue precise target values without the quantization errors common to analog interfaces.

Complementary position loops can be closed through an additional port that accepts a digital position command value stream. A second encoder socket is provided for spindle feedback or additional motor feedback, allowing incremental or absolute signals to return to the CNC. This arrangement supports coordinated spindle control when the machine requires both command input and returning feedback signals. The electronics are specified to run in ambient temperatures from 5 to 45 degrees Celsius and at installation heights up to 1000 m above sea level, so the published current and speed performance can be maintained without derating.