Product Description:

The KDA 3.3-100-3-A00-U1 spindle drive is manufactured by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. As a Series 3 unit, it converts shared DC link energy into a regulated three-phase output that powers high-speed machine-tool spindles. Within an automated machining center, the drive receives velocity commands from the CNC control, modulates motor current, and maintains constant spindle speed during cutting, drilling, or grinding duty. This operating role suits machine tools that require stable spindle response under changing load conditions.

Electrically, the drive is powered from a DC bus held at 300 VDC; this voltage ceiling protects the inverter against excessive back-EMF. The output phase current is rated at 100 A, providing the torque capacity required for heavy metal-removal cycles. A dedicated heat sink blower draws its supply from 115 V/50-60 Hz, and the resulting airflow keeps IGBT junctions within limits because the device relies on forced cooling. Continuous service is specified from 5 to 45 °C, so additional cabinet refrigeration is unnecessary under normal shop conditions. Because the auxiliary fan uses a separate AC source, cooling continues even while the power stage is disabled.

Mechanical installation is permissible up to 1000 m above sea level without derating, and the thermal assembly uses a mounted heat sink blower fixed to the rear plate to streamline cabinet airflow paths. Communication stays straightforward because this version has no additional interface option and includes no second encoder input for spindle orientation. Speed references are delivered as an analog speed command, allowing direct connection to conventional ±10 V controllers and minimizing auxiliary conversion hardware. This arrangement supports legacy control layouts that still use analog spindle references in existing machine platforms.