Product Description:

The KDA 2.1-100-3-AQD-U1 spindle drive is manufactured by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. Designed for CNC and general machining centers, the unit converts the DC link energy of an Indramat modular supply into regulated three-phase output that precisely accelerates and maintains high-speed spindle motors. It accepts reference values from the motion controller and modulates current to match programmed spindle profiles. This supports accurate cutting, drilling, grinding, and other spindle functions in closed-loop machine operation.

The drive provides a continuous output of 100 A, so connected spindle motors receive ample torque during rapid speed changes. It draws its intermediate circuit power from a 300 VDC bus assembled inside the cabinet, and it interprets the speed reference as an analog voltage for smooth ramp control by the numerical system. A secondary channel accepts the spindle’s positional reference as a digital command value, which supports threading and spindle orientation cycles that require repeatable angular control. Thermal stability is maintained through forced cooling, and an integrated blower directs air across the heat sink so the power section can sustain rated current during continuous duty.

The heat sink blower is supplied from a dedicated 115 V/50–60 Hz source, which keeps the ventilation supply separate from the DC link used by the power stage. The unit can be installed in production environments where ambient air remains between 5 to 45 °C, and performance is permitted up to 1000 m above sea level without additional cooling measures. It is built on the Series 2 platform, which identifies the product generation used for this spindle drive. Separating blower power from the main DC link helps keep the cooling circuit independent of spindle power conversion during operation.