Product Description:

The KDA 2.1-100-3-DPD-U1 spindle drive is produced by Bosch Rexroth Indramat as part of the KDA Spindle Drives series. As a closed-loop power module, it supplies regulated three-phase output to machine-tool spindles and lets CNC controllers adjust speed and torque in real time. Using digital reference words, the drive links the motion path to the cutting process, so it acts as an interface between the numerical control and the motor in automated milling, turning, or grinding equipment.

The drive is dimensioned for a continuous output of 100 A, allowing it to energize medium-frame spindle motors without derating. Its DC link expects 300 VDC, a value generated by compatible supply modules in the Rexroth cabinet. Thermal energy is extracted by an internal blower powered from 115 V, 50/60 Hz, so the cooling circuit remains active even when the DC bus is discharged. This air mover works with forced cooling, channeling airflow across the heat sink fins to keep semiconductor junctions within safe limits during high duty cycles. Motion commands reach the power stage through a digital 16-bit parallel speed command word, giving fine velocity resolution for high-precision machining.

The cooling hardware is anchored to a mounted heat sink blower, so installation requires clearance for the exhaust path but no external ducting. Reliable operation is permitted from 5 to 45 °C, which covers typical shop-floor climates, and at elevations up to 1000 m above sea level, where thinner air reduces convective exchange. A second encoder input is available for spindle feedback or an auxiliary motor channel, letting the drive compare position data received over the additional digital position interface. This option is useful in machines that require an extra feedback channel for monitoring or synchronization.