Product Description:

The KDA 3.1-100-3-AY0-U1 is a spindle drive module developed by Bosch Rexroth Indramat for the KDA Spindle Drives series. Acting as a closed-loop power stage, it converts DC bus energy into a regulated three-phase output for high-speed motor spindles used in machining centers and other automated equipment. When paired with a matching controller, the unit follows velocity references, monitors feedback, and maintains torque accuracy during continuous or cyclic metal-cutting operations. Its function suits machine platforms that require stable spindle behavior during repeated speed changes and varying cutting loads.

This model supplies a continuous phase current of 100 A, enabling it to energize medium-to-large spindle motors without entering saturation. Its DC link runs at 300 VDC, a level that supports fast dynamic response with moderate switching losses. The dedicated heatsink blower draws power from an auxiliary line rated at 115 V/50–60 Hz, so airflow remains available even when the main bus is disabled. Heat removal is handled through forced cooling, with the blower pulling ambient air across the finned heatsink to keep semiconductor junction temperatures within safe limits under sustained load. Speed references reach the drive as an analog command, matching control systems that use ±10 V velocity signals.

The drive operates in ambient temperatures from 5 to 45 °C, so it fits standard industrial cabinets when excessive heat is avoided. Continuous operation is supported up to 1000 m above sea level, covering most production plant elevations without derating. A factory-installed mounted heatsink blower simplifies panel assembly because no external ducts are required. For orientation tasks and high-resolution positioning, the electronics accept a second encoder input and synchronous input, allowing simultaneous feedback from spindle-mounted and machine-side sensors. This arrangement supports coordinated motion control where both spindle speed regulation and position-related reference signals must be handled by the same drive section.