Product Description:

The KDA 3.1-100-3-AYI-U1 is a spindle drive produced by Bosch Rexroth Indramat within the KDA Spindle Drives series. As a closed-loop power module, it converts DC link energy into three-phase motor power for high-speed machining spindles while monitoring feedback from primary and auxiliary encoders. The unit regulates spindle torque and velocity with the short cycle times required in CNC equipment. This makes it suitable for drilling, milling, and similar processes where spindle speed must remain steady as load changes.

Electrically, the drive operates from a DC link of 300 VDC, allowing it to supply a continuous armature demand of 100 A to the connected spindle motor. Heat generated at this load is removed by a mounted heat sink blower, and the enclosure uses forced cooling so airflow passes across the fins instead of relying on natural convection. The blower itself draws single-phase power at 115 V/50–60 Hz, which keeps the auxiliary cooling supply separate from the main drive bus. Directed airflow helps the power section dissipate switching losses during long production runs.

The unit can be mounted where ambient air stays within 5 to 45 °C, and altitude is limited to 1000 m above sea level to maintain dielectric clearances and cooling performance. For position feedback beyond the main encoder loop, the front panel provides an incremental encoder output, plus a second encoder and synchronous input channel that supports resolver or additional incremental signals. An analog speed command input accepts ±10 V references from the CNC controller, letting the host system handle velocity profiling while the drive closes its internal current loop for stable spindle response. The additional feedback paths let the drive exchange synchronized motion information with the CNC without requiring a separate interface module.