Product Description:

The KDA 1.1-100-300-W1-115 is a spindle drive in the KDA Spindle Drives series developed by Bosch Rexroth Indramat. As a closed-loop power stage, it receives speed and torque commands from a numerical controller and converts DC-bus energy into regulated output for an attached spindle motor. The unit is intended for machine-tool service, where stable rotation is needed during cutting, drilling, and grinding. Its control behavior helps the spindle respond to load changes without unnecessary speed variation during demanding machining steps. This makes it suitable for automated production lines that require repeatable tool motion and steady process speed.

The drive can supply up to 100 A of continuous output current, which is the maximum RMS phase current available to the motor windings under rated thermal conditions. Its DC link is fed with 300 VDC, so the installation requires a compatible power source or regeneration module that can maintain that level. Thermal management uses a mounted heatsink blower with forced cooling, and airflow is directed across the external fins to remove heat from the power section. By carrying heat away from the semiconductors and bus components, this arrangement helps preserve output stability during extended spindle duty in enclosed cabinets. This cooling method also supports reliable operation when the spindle is held near constant speed for long production cycles.

Operation is permitted in ambient air from 5 to 45 °C, and the approved installation altitude is 1000 m above sea level. Outside those limits, reduced air density or higher cabinet temperature can lower cooling effectiveness and may require current reduction. The design supports both induction and synchronous spindle motors, and its closed-loop speed and torque regulation helps maintain consistent motion during long machining runs. Stable thermal conditions also help the feedback loop maintain accurate speed response during repeated acceleration and deceleration events. Proper spacing around the cooling path remains important so the blower can move air freely through the heat sink and remove waste heat during continuous operation.