Product Description:

The KDA 2.1-100-3-DP0-W1-220 spindle drive is produced by Bosch Rexroth Indramat as part of the KDA Spindle Drives series. Designed to regulate high-speed machine-tool spindles, the unit converts DC bus power from a common supply into controlled three-phase output while monitoring position and velocity. Within an automation cell, it forms the link between a CNC controller and the mechanical spindle. Because spindle speed and shaft position must stay coordinated with the motion program, the drive continuously adjusts motor output as cutting load changes during drilling, milling, and grinding processes.

The drive is energized by a DC bus of 300 VDC, and its output stages can deliver a continuous 100 A of current to the spindle motor. Thermal management relies on a mounted heat sink blower operating in forced cooling mode, and the blower itself is powered from an auxiliary supply of 220 V/50–60 Hz. This cooling arrangement removes switching and conduction heat during sustained spindle operation and helps the unit remain stable through long machining cycles. Separating blower power from the main conversion stage also allows airflow to be maintained independently of the DC bus operating state.

The unit maintains full performance in ambient temperatures from 5 to 45 °C, and no derating is required until the installation exceeds 1000 m above sea level. Command signals reach the power section through a 16-bit digital parallel interface, giving the CNC high-resolution speed words with minimal delay. A dedicated second encoder input accepts spindle position or auxiliary motor feedback, which supports synchronization tasks such as rigid tapping, orientation control, and speed matching during coordinated motion. The limited interface set also keeps wiring straightforward and helps reduce unwanted electrical noise inside the control enclosure.