Product Description:

The KDA 2.1-100-3-API-W1 spindle drive is produced by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. As a regulated power stage, it supplies controlled current to high-speed machine tool spindles, converting DC link energy from a central supply into precisely commanded three-phase output. Within an automation cell, this unit handles rapid speed changes and torque demands, allowing milling, drilling, or grinding heads to maintain programmed cutting conditions while the associated CNC controls handle interpolation and path planning.

The drive accepts a DC link of 300 VDC from the supply module and can deliver a continuous armature current of 100 A to the spindle motor, giving the numerical control a broad torque range for heavy chip-removal cycles. Speed reference enters the unit as an analog command voltage, so velocity loops in legacy or mixed-field installations are supported without digital fieldbus adaptation. Thermal management is handled by a mounted heat sink blower. This fan draws its own single-phase source of 220 V/50–60 Hz, ensuring forced airflow across the power semiconductors even when the main DC bus is idle. The dedicated cooling path supports dense cabinet layouts by helping prevent stagnant air pockets around adjacent modules.

An auxiliary port provides an incremental encoder output that repeats the motor position signal for a downstream PLC or oscilloscope. A second feedback socket can accept signals dedicated to spindle feedback or additional motor feedback, allowing tandem axes or dual-loop control strategies without changing the main power stage. The electronics remain stable between 5 to 45 °C. Installation altitude is limited to 1000 m above sea level. These operating conditions support steady spindle control during prolonged high-speed machining.