Product Description:

The KDA 2.1-150-3-D00-W1 belongs to the KDA Spindle Drives series from Bosch Rexroth Indramat. It functions as a dedicated spindle drive, supplying regulated three-phase power to high-speed motor windings so machining centers can maintain commanded surface speeds and cutting forces during milling, drilling, and similar operations. By linking directly to the common DC bus in multi-axis systems, the drive closes the loop between numerical control commands and the mechanical spindle, supporting repeatable acceleration, deceleration, and positioning under changing process loads.

The internal power section operates from a DC link of 300 VDC, and its silicon devices are sized for a continuous output of 150 A. Speed information is accepted as a digital 16-bit parallel word, giving the controller fine resolution when calculating spindle velocity. Thermal management relies on a mounted heatsink blower; air is pulled across the finned aluminum plate, and the arrangement uses forced cooling to remove the switching and motor-generated heat that builds up during long cutting cycles. This combination suits heavy material-removal operations where large current pulses and accurate electronic speed references are required for stable spindle control.

The blower motor is supplied from an auxiliary line of 220 V 50-60 Hz, isolating the cooling circuit from the main DC path and simplifying cabinet wiring. Reliable operation is maintained within an ambient range of 5 to 45 °C, and the performance envelope remains valid up to 1000 m above sea level without derating. This separate fan supply keeps the cooling circuit independent from the main spindle power section during operation. There is no additional interface option, and the design omits a secondary encoder port, so all position or speed feedback must enter through the primary resolver channel.