Product Description:

The KDA 3.1-100-3-LPS-W1 spindle drive is produced by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. It acts as the power and control element for high-speed motorized spindles in CNC machining centers, where it converts a regulated DC link into three-phase output that follows digital speed commands from the machine control. By coordinating torque and velocity in real time, the unit helps maintain surface finish and dimensional accuracy during drilling, milling, and grinding cycles. Its role in the spindle system allows rapid response to changing cutting conditions and commanded speed adjustments. Integrated diagnostics and network connectivity support status monitoring and stable communication during machine operation.

The drive provides a continuous output of 100 A, enabling it to energize sizable induction or synchronous spindles without derating. The power stage is fed from a 300 VDC bus shared with other axes in the cabinet. Thermal energy is removed by a mounted heat sink blower; this arrangement uses forced cooling for consistent heat extraction during sustained spindle loads. The blower motor runs from an auxiliary supply of 220 V, 50–60 Hz, and speed references arrive over a fiber-optic ring through the SERCOS interface for synchronized motion with other machine axes.

Integration features include a second encoder input for spindle or auxiliary motor feedback and a maintenance port that uses RS-232-C for parameter access. The additional feedback channel allows the drive to process encoder data for related spindle functions without requiring a separate interface. The series 3 hardware operates within an ambient range of 5 to 45 °C, provided the installation elevation does not exceed 1000 m above sea level. Within those limits, the drive maintains encoder signal quality, torque linearity, and stable speed regulation during demanding production shifts.