Product Description:

The KDF1.1-100-300-W1-220 is an AC spindle drive produced by Bosch Rexroth Indramat within the KDF Variable Frequency Drives series. As a variable-frequency controller, it modulates the stator frequency supplied to an AC asynchronous spindle motor, letting machining centers or grinders regulate shaft speed without mechanical gear changes. Integrated positioning support and closed-loop motor feedback allow this unit to execute incremental moves and hold commanded velocities precisely, making it a core component in numerically controlled production lines that demand repeatable spindle behavior.

The drive’s power section is rated for a DC bus of 300 VDC, so matched KDV modular supplies must furnish a stable intermediate circuit at that potential. A continuous output envelope of 100 A enables high-torque acceleration of large spindle masses while maintaining thermal limits enforced by its blower-cooled housing. Regenerative and motoring action occur in all directions because the inverter supports four-quadrant operation, letting deceleration energy return to the shared bus instead of being wasted as heat. Speed is regulated by a microprocessor-based digital velocity loop that samples encoder feedback, updates control words, and drives the IGBT bridge at high frequency to minimize overshoot during tool changes and tapping cycles.

Control electronics are energized from a separate 220 VAC fan and logic supply, isolating low-level circuits from the main power conductors. When paired with an AC asynchronous spindle, the converter can reach a mechanical limit of 8000 RPM, matching typical requirements for medium-diameter milling heads. Parameter storage and diagnostics reside on the plug-in CDM computer module, allowing data to remain with the removable control section. The power stage itself follows the KDA Asynchronous drive-module concept, so it mounts beside other three-phase rectifier sections and shares a common heat-extraction plenum.