Product Description:

The KDA 2.1-100-3-AYD-U1 spindle drive is produced by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. As a dedicated spindle-axis power stage, it converts a common DC bus into controlled three-phase output for high-speed motor assemblies used in CNC machining centers. That role lets it drive spindles during drilling, milling, and similar machining processes where rapid response and steady rotation are important. The unit is version 2 in the KDA line and uses the general mechanical layout shared by related drives, which helps cabinet installation in multi-axis systems.

Working from a DC link of 300 VDC, the unit can deliver a continuous motor current of 100 A for rapid acceleration and constant-speed cutting tasks. The heatsink blower is supplied by a single-phase auxiliary line rated at 115 V/50–60 Hz, so a separate low-voltage supply is not required for that cooling circuit. Electronics are designed to operate within an ambient range of 5 to 45 °C, and thermal energy is removed by the integral mounted heatsink blower that pushes air across the fin stack. This airflow helps keep the power semiconductors within a stable operating temperature during sustained spindle duty, and stable current delivery supports cutting consistency when spindle load changes quickly.

forced cooling supports full performance up to 1000 m above sea level without output derating. For motion coordination, the drive accepts a digital position command value as well as a second encoder input and a synchronous input, which supports dual-loop control when spindle orientation and tool position must track together. The added feedback path lets the controller compare commanded motion with actual spindle behavior during synchronized machine sequences. Speed override is handled through an independent analog reference channel, allowing the host controller to trim RPM without changing the digital position data.