Product Description:

The KDA 3.1-100-3-AY0-W1 is a drive unit developed by Bosch Rexroth Indramat for the KDA Spindle Drives series. It forms the power stage between a machine-tool controller and the motorized spindle, converting DC link energy into the three-phase output needed for high-speed cutting, grinding, or drilling operations. By combining current regulation with encoder feedback, the device maintains constant torque across demanding speed ranges, making it suitable for precision industrial automation where spindle speed stability directly affects surface finish and cycle time. This arrangement also helps the spindle hold the commanded speed when cutting loads change during operation.

Its electrical core is rated for a continuous motor phase output of 100 A while drawing energy from a regulated bus of 300 VDC. Velocity references arrive as an analog signal, so the drive can be paired with conventional CNC controllers that use ±10 V speed commands. Thermal management relies on a mounted heat sink blower; the fan forces air through the aluminum fins and, together with the drive’s forced cooling mode, removes heat generated by switching losses at full rated current. The hardware revision is series 3, and no additional interface option is installed, which keeps the control connections straightforward.

The blower motor is powered from an auxiliary line of 220 V/50–60 Hz, allowing airflow to continue even when the DC link is de-energized. Reliable operation is specified between ambient temperatures of 5 to 45 °C, and cabinet locations up to 1000 m above sea level do not require output derating. Feedback flexibility is improved by the integrated second encoder and synchronous inputs, enabling dual-channel position monitoring on tandem spindle arrangements. Because no additional interface module is installed, field wiring is limited to the primary command, power, and encoder ports.