Product Description:

The KDA 3.1-100-3-L00-W1 spindle drive is produced by Bosch Rexroth Indramat within the KDA Spindle Drives series. Designed to regulate high-speed machine tool spindles, it converts regulated DC bus power into three-phase output while accepting digital speed commands from a motion controller. In automated machining centers, the unit forms the interface between the main DC supply and the asynchronous or synchronous spindle motor, enabling closed-loop speed control and rapid acceleration for drilling, milling, or grinding tasks. This arrangement helps the spindle maintain stable speed when cutting loads change and when the controller calls for a quick response during acceleration or deceleration.

The drive operates from a bus voltage of 300 VDC, and its output stage can deliver a continuous 100 A of current to the connected motor. Internal monitoring helps keep the current within limits during acceleration and regenerative braking. A separate heatsink blower is powered from an auxiliary supply of 220 V at 50/60 Hz, which keeps the cooling circuit separate from the DC link. Heat is removed by forced cooling, which supports full-load operation when cabinet airflow is limited. Commanded speed values arrive over the SERCOS interface, allowing synchronization with multi-axis controllers through a fiber-optic ring.

Safe operation requires ambient air from 5 °C to 45 °C, and the drive uses thermal sensors within that range to protect the power semiconductors. Installations up to 1000 m above sea level require no current reduction in standard factory settings. Cooling air is directed across a finned plate by a mounted heatsink blower, so no external ducting is necessary. The configuration comes with no additional interface option, and it also omits a second encoder input, which reduces wiring complexity when a single spindle feedback channel is sufficient.