Product Description:

The KDA 3.3-100-3-A00-W1 spindle drive is built by Bosch Rexroth Indramat for the KDA Spindle Drives series. It accepts a DC link from an Indramat supply module and converts that energy into controlled three-phase power for high-speed machining spindles. By following an analog velocity reference from the numerical controller, the drive delivers the torque and speed regulation required for drilling, milling, and grinding stations in automated production lines. Stable spindle control also helps the machine maintain consistent cutting performance as process loads change during operation.

The internal power section operates from a DC link voltage of 300 VDC, matching the standardized supply rails used in multi-axis Indramat cabinets. Under continuous duty, the current can reach 100 A, enabling the output stage to energize large-frame spindle motors without derating. Thermal energy is removed by a mounted heat sink blower, and forced cooling keeps semiconductor junction temperatures within safe limits during rapid accelerations. This blower runs on an auxiliary source of 220 V/50-60 Hz, so the fan can be powered from a common plant supply. The unit may be installed up to 1000 m above sea level without adjustment, and the controlled airflow supports repeated acceleration and deceleration cycles in enclosed cabinets.

The electronics operate properly when the surrounding air stays between 5 to 45 °C, which suits typical conditioned industrial spaces. Speed commands enter as an analog signal, so retrofit systems that already generate voltage references do not need rewiring. The drive has no additional interface option and omits a secondary encoder socket, which confines feedback to the primary spindle encoder and reduces unused ports. This interface layout is straightforward for systems that rely only on the standard spindle command and feedback path.