Product Description:

Bosch Rexroth Indramat manufactures the KDA 3.1-150-3-LQI-W1 spindle drive within the KDA Spindle Drives series. The device functions as the power stage that links a DC bus to high-speed induction or synchronous spindles on machining centers. In an automation cell, it converts motion commands from the controller into regulated three-phase output so cutting, milling, or grinding operations can maintain the programmed surface speed while loads vary. Its role is centered on stable spindle control during demanding machine-tool duty.

The power section is rated for a continuous output of 150 A, enabling the drive to handle substantial current demand on midsize and large spindles. Its input comes from a shared DC supply at 300 VDC, and this common bus arrangement allows regenerative energy to be reused by other axes. Thermal management relies on forced cooling that passes ambient air across a finned heat exchanger. Heat is removed by a mounted heat sink blower fastened directly to the rear panel, so cabinet airflow does not require a separate blower arrangement. Speed commands arrive digitally over the SERCOS interface, letting the CNC send setpoints in real time and read actual speed data over the same fiber-optic loop.

The cooling fan is powered from an external source rated at 220 V/50-60 Hz, which keeps the blower load separate from the internal electronics. Safe operation is specified between 5 to 45 °C, so the surrounding air must remain within that range during continuous duty. Installation is permitted up to 1000 m above sea level, and operation above that height requires derating because of lower air density. For diagnostic or spindle-orient functions, the drive routes position feedback through an incremental encoder output, giving downstream motion controllers direct access to rotor angle without separate signal converters.