Product Description:

The KDA 2.1-050-3-DQS-W1 spindle drive is produced by Bosch Rexroth Indramat as part of the KDA Spindle Drives series. In machining centers and other automated equipment, the unit converts CNC or PLC command signals into controlled three-phase power for high-speed spindle motors. This allows precise speed and torque regulation during cutting, drilling, and grinding cycles, and it helps keep spindle behavior stable as machining loads change.

This model draws a continuous 50 A from the intermediate DC bus, so the connected power supply must support that current under sustained load. The internal control electronics operate from a stabilized link voltage of 300 VDC, which is supplied by an external power module and serves as the energy source for the output stage. Thermal management relies on forced cooling, and a factory-mounted mounted heat sink blower directs airflow across the IGBT stack to remove switching losses. The blower itself uses an auxiliary single-phase supply of 220 V/50–60 Hz, which keeps its power demand separate from the logic circuits and maintains airflow even when the drive is disabled. This arrangement helps the power section stay within its intended operating temperature range during prolonged high-speed machining duty.

Closed-loop speed regulation is driven by a 16-bit parallel digital command word, allowing fine spindle speed changes without the drift associated with analog signals. For parameter upload and diagnostics, the unit includes an RS-232C serial interface, which supports communication with connected computers or supervisory controllers. Reliable operation is permitted from 5 to 45 °C, and performance is maintained at elevations up to 1000 m above sea level. Its compact architecture suits modular rack mounting in machine tool cabinets and other automated equipment.