Product Description:

Bosch Rexroth Indramat manufactured the KDA 3.2-100-5-A00-W1 spindle drive as part of the KDA Spindle Drives series. This unit conditions and feeds three-phase power to high-speed machine-tool spindles, converting velocity commands from the numerical control into regulated motor voltage. By closing the torque loop internally, it stabilizes spindle speed during cutting, drilling, or grinding operations and supports rapid acceleration and deceleration cycles common in automated machining lines. This control behavior helps the spindle maintain the commanded speed when cutting load changes during material removal.

The power electronics generate substantial heat, so the drive relies on a heat sink-mounted blower that channels air directly across the fins. The blower is powered from a dedicated 220 V/50-60 Hz auxiliary source, enabling continuous airflow whenever cabinet power is present. This arrangement is part of the drive’s forced cooling mode, which helps prevent thermal derating under constant load. The inverter can supply a steady 100 A of motor current, covering the demands of medium-to-large spindles during heavy cuts. Speed reference data are accepted as an analog voltage signal, allowing straightforward integration with legacy CNC controllers. No additional communications interface is installed, and the design also omits a second encoder input, which keeps external wiring simpler.

Full performance is maintained within an ambient range of 5 to 45 °C, while elevations up to 1000 m above sea level are supported before current derating becomes necessary. The unit is release 3 of the platform and internal version 2. At higher elevations, output current must be reduced to limit thermal stress in the power section. These limits help determine cabinet placement, airflow clearance, and the acceptable installation environment for continuous spindle service.