Product Description:

The KDA 2.1-150-3-DQ0-W1 is a spindle drive produced by Bosch Rexroth Indramat and is part of the KDA Spindle Drives series. Acting as a closed-loop power stage, it converts regulated DC energy into three-phase output for high-speed machine-tool spindles. Inside an automation cell, the unit accepts digital speed references from a CNC controller and regulates motor current for drilling, milling, and grinding operations. This arrangement lets the spindle respond quickly to changing load conditions while maintaining stable speed control during material removal.

It operates from a DC bus of 300 VDC and can deliver a continuous output of 150 A to the connected spindle motor. The requested rotor velocity is transferred through a digital 16-bit parallel command, so the controller can send speed data without the offset errors associated with analog signaling. Internal control electronics use a blower supplied with 220 V/50–60 Hz mains, while the power section relies on forced cooling to limit heat buildup during sustained spindle loading. The drive is intended for systems that need repeatable speed changes, controlled acceleration, and consistent torque output over changing machining cycles.

The drive can operate between 5 to 45 °C and at elevations up to 1000 m above sea level without current derating. Thermal energy is removed through a mounted heat sink blower that directs air across the rear cooling surface of the housing. Rear-mounted airflow also keeps the thermal path direct and separate from the command wiring. The unit has no additional interface option, so command and control signals use the standard digital channel only. This fixed interface layout keeps the signal path straightforward and suits installations where the spindle axis is integrated directly with a CNC-controlled drive system.