Product Description:

The KDA 3.3-100-3-AP0-W1 is a spindle drive produced by Bosch Rexroth Indramat as part of the KDA Spindle Drives series. Designed for CNC machine tools, the unit converts a regulated DC bus into controlled three-phase power for high-speed spindle motors, allowing speed and torque regulation matched to cutting demands. As an automation component, it integrates with Indramat drive controllers to deliver repeatable spindle positioning and smooth acceleration during milling, drilling, or grinding cycles. This type of drive is commonly used where spindle speed must remain stable while cutting loads change throughout the machining process.

Thermal management is based on a mounted heat sink blower, and airflow is intensified through forced cooling. The blower runs from an auxiliary supply of 220 V at 50–60 Hz, so plant wiring can use standard single-phase mains. Internally, the drive is linked to a DC bus of 300 VDC, which provides the voltage used for power conversion at the motor terminals. Under continuous duty, the current limit is 100 A, enabling the unit to support large spindle motors without derating. This cooling method helps keep the power section within its operating range during long machining cycles, and unit designation 3 indicates the control platform generation while the housing has no additional interface option.

Operation is permitted from 5 to 45 °C, and cooling capacity is maintained up to a height of 1000 m above sea level. Speed references enter through an analog speed command, allowing simple voltage or current setpoints from legacy CNC controls. For closed-loop precision, a second encoder input can accept spindle feedback or additional motor feedback. This feedback arrangement allows the drive to monitor rotational behavior more closely during positioning or constant-speed operation. It is well suited for machine tools that rely on conventional command signals but still require responsive spindle control.