Product Description:

The KDA 3.2-050-3-L00-W1 spindle drive is manufactured by Bosch Rexroth Indramat as part of the KDA Spindle Drives series. In automated machining centers, this unit supplies regulated three-phase power to high-speed spindle motors, allowing precise speed setting and torque delivery during cutting, drilling, and grinding operations. By converting a fixed DC bus into variable-frequency output while monitoring motor feedback, the drive links motion sequences from the CNC controller to the mechanical work performed at the spindle. This arrangement helps maintain stable spindle behavior as load conditions change during machining.

The drive draws its main energy from a DC bus rated at 300 VDC, so the intermediate circuit and regeneration components must match that level. Under continuous load, it can supply a phase current of 50 A, which is the maximum steady-state current available to the spindle without thermal overload. Speed references arrive digitally through the SERCOS interface, reducing analog offset issues and supporting synchronous operation with other axes on the network. Heat generated by power semiconductors is removed by a mounted heat sink blower. This arrangement uses forced cooling to keep semiconductor junction temperatures within safe limits during prolonged high-speed machining.

The fan itself is supplied from an auxiliary line of 220 V/50–60 Hz, so airflow remains stable even if the DC bus fluctuates during regeneration. The electronic section operates in ambient conditions between 5 to 45 °C, and the unit may be installed at elevations up to 1000 m above sea level without derating. The drive has no additional interface option, and the second encoder input is omitted. Internal design identifiers list this model as series number 3 and version 2, which distinguishes this build within the KDA product line.