Product Description:

The KDA 3.1-150-3-AYI-W1 spindle drive is produced by Bosch Rexroth Indramat within the KDA Spindle Drives series. The device is version 3 and converts a regulated DC link into three-phase power for high-speed machining spindles while supervising acceleration, braking, and steady-state operation in automated production lines. It is used wherever precise rotational control is required, especially in milling or drilling stations that rely on stabilized torque over a broad speed range. This arrangement supports machine tools that require repeatable spindle speed during cutting, dwell, and deceleration.

At the power stage, the drive operates from a DC link of 300 VDC and can deliver up to 150 A of continuous output current to the spindle motor. Thermal loads are removed through a mounted heatsink blower; this hardware is paired with forced cooling so that internal component temperatures remain stable within the 5 to 45 °C ambient range. The separate blower allows cooling airflow to remain independent of the spindle output stage. The assembly may be installed at elevations up to 1000 m above sea level without current derating, allowing placement in most industrial workshops. Internally, the electronics correspond to series 3 hardware, and the DC bus contactors and braking circuits are sized for the rated current without external augmentation.

For command and feedback, speed reference is accepted as an analog voltage that spans the full nominal frequency window. A built-in interface supplies an incremental encoder output for supervisory motion controllers. A separate second encoder input and synchronous input permit dual-channel feedback when position tracking is required. The heatsink blower draws 220 V/50–60 Hz from an auxiliary AC source, which keeps its airflow subsystem separate from the DC link. This separation prevents the blower load from affecting the main DC bus.