Product Description:

The KDA 3.3-100-3-DPD-U1 spindle drive is manufactured by Bosch Rexroth Indramat as part of the KDA Spindle Drives series. Within a CNC machining center, it supplies the controlled three-phase power that turns the main spindle and synchronizes acceleration and braking with the axis drives. By housing the power stage, control logic, and heat sink in one chassis, the module simplifies cabinet layout and integrates directly with the machine’s digital motion controller.

The power section ties into a common DC bus at 300 VDC, providing a stable intermediate circuit for the IGBT bridge. Its output stage is rated for 100 A of continuous current so heavy cuts can be made without spindle stall. An auxiliary fan circuit fed by 115 V/50–60 Hz energizes the blower that removes heat from the drive. The integrated heat sink-mounted blower sits behind the semiconductor stack, and the assembly relies on forced cooling, keeping airflow constant regardless of cabinet ventilation. These limits affect conductor sizing, fuse selection, and available power margin when the unit is installed in multi-axis machine tools.

The drive operates within environmental limits of 5 to 45 °C, so temperature-controlled enclosures are needed in warmer facilities. Installation is acceptable up to 1000 m above sea level; beyond that, current and duty must be reduced because lower air density impairs heat removal. All command channels are binary, and the drive accepts a digital 16-bit parallel speed command value for velocity control. A separate digital position command value line lets the CNC execute spindle orientation or tapping cycles. Paired with the second encoder input for spindle or auxiliary motor feedback, these interfaces complete a closed loop and eliminate analog drift in high-precision production.