Product Description:

The KDA 3.1-100-3-DQS-U1 spindle drive is produced by Bosch Rexroth Indramat within the KDA Spindle Drives series. As a dedicated spindle drive, it converts DC-link energy into regulated three-phase power for motor spindles used in machining centers, turning lines, and automated tooling stations. When paired with the proper control hardware, it supports rapid speed changes, stable torque delivery, and the responsive spindle behavior needed for cutting, drilling, and grinding processes. This makes the unit suitable for machine tools that demand fast spindle response during repeated cycle changes.

The inverter section provides a continuous output of 100 A, which is the maximum phase current available during normal operation without thermal derating. Its power stage operates from a common DC link of 300 VDC, so the drive must be installed with a compatible upstream supply module. Spindle speed is commanded through a 16-bit digital parallel command word, which allows fine reference resolution for precise speed control across changing machining conditions. Thermal management uses forced cooling rather than natural convection, and the auxiliary cooling circuit is supplied from 115 V/50-60 Hz.

Heat is removed by a mounted heatsink blower attached to the housing, which helps maintain airflow across the power section during sustained spindle loading. Setup access and diagnostic communication are provided through an RS-232C serial interface, allowing parameter transfer and status monitoring without additional fieldbus hardware. The drive maintains rated accuracy in ambient air from 5 to 45 degrees Celsius, and no altitude derating is required up to 1000 m above sea level. Proper cabinet ventilation is still necessary so the blower can move air freely and keep internal temperatures stable during continuous operation.