Product Description:

The KDA 2.1-100-3-DYI-W1 is a spindle drive produced by Bosch Rexroth Indramat in the KDA Spindle Drives series. It serves as a closed-loop power stage that regulates high-speed machine tool spindles, accepting digital speed references from a controller and modulating motor current accordingly. In automated machining cells, the unit converts a regulated DC link into three-phase output while also providing encoder interfaces so the numerical control can read actual spindle position and velocity. Because the drive monitors feedback while regulating output current, it can respond quickly to changing spindle demand during cutting cycles. This makes it suitable for machine tools that need repeatable speed control during acceleration, steady cutting, and deceleration.

The power section is energized from a DC bus rated at 300 VDC, and the current loop can deliver up to 100 A continuously, giving the connected spindle sufficient torque for heavy material removal. A separate blower line of 220 V/50-60 Hz feeds the mounted fan that pushes air across the heat sink. This arrangement uses a mounted heat sink blower together with forced cooling to remove switching losses generated by large output currents. The electronics remain functional within an ambient range of 5 – 45 °C, which suits normal factory conditions. The dedicated airflow path helps move heat away from the power components so continuous spindle duty does not overload the heat sink.

Command values arrive through a digital 16-bit parallel bus, allowing the controller to issue fine speed increments without analog drift. Installation is permitted up to 1000 m above sea level, enabling use in most industrial locations without altitude correction. Feedback versatility is enhanced by an incremental encoder output for downstream devices, while an additional port accepts a second encoder and synchronous marker so multiturn position can be monitored without external splitters. The added encoder connection supports systems that need spindle-related position signals at more than one interface point. This layout reduces the need for separate signal-splitting hardware and keeps feedback routing straightforward in multi-axis cabinets.