Product Description:

The KDA 3.3-100-3-AY0-W1 belongs to the KDA Spindle Drives series manufactured by Bosch Rexroth Indramat. As a spindle drive, it supplies regulated three-phase power to synchronous or induction spindles so that machine tools can maintain programmed cutting speeds under varying load. Integration of this unit simplifies axis packages in CNC machining centers because speed regulation and protective functions are handled within a single chassis. This arrangement supports stable spindle performance during acceleration, cutting engagement, and changing process loads.

The drive’s rated output line current is 100 A, enabling it to energize medium-to-large spindle motors without external boosters. A bus link voltage of 300 VDC feeds its power stage, matching common supply rails used in modular Indramat cabinets. The heatsink blower runs from an auxiliary source of 220 V AC at 50–60 Hz, so thermal management can remain active even when the DC link is de-energized. Physical heat removal relies on a mounted heatsink blower that expels air directly across the fin stack, and forced cooling helps keep semiconductor temperatures within an acceptable operating range during continuous duty. Reliable operation is specified for ambient temperatures between 5 to 45 °C, which suits most industrial shop-floor environments without derating.

Commanding spindle velocity is accomplished with an analog speed reference that the controller converts into a PWM output for the motor. Position-oriented applications benefit from the integrated second encoder input, which lets the drive process feedback from a motor encoder and a spindle-mounted encoder at the same time. Installation is permitted up to 1000 m above sea level; beyond that height, reduced air density can lower cooling performance and available current. The unit is part of Series 3, and systems that require fieldbus communication use external interface hardware.