Product Description:

The KDA 2.1-150-3-DP0-W1-220 spindle drive is produced by Bosch Rexroth Indramat as part of the KDA Spindle Drives series. Positioned in Series 2, the unit acts as a closed-loop power amplifier that converts the fixed DC bus from an Indramat supply module into adjustable three-phase output for high-speed machine-tool spindles. In an automation cell, the drive regulates torque and velocity so the spindle can perform synchronous positioning, tapping, and contour cutting without mechanical gear changes. It interfaces directly with a digital motion controller to maintain a tight spindle control loop during changing process demands.

The power section is fed from a regulated DC link at 300 VDC, and it can source up to 150 A of continuous output current to the motor windings. A dedicated heatsink blower operates on 220 V/50–60 Hz, helping keep semiconductor temperature within rated limits during sustained spindle loading. Speed reference data arrives over a digital 16-bit parallel port, so the controller can send absolute velocity words without analog drift. Reliable operation is maintained within an ambient range of 5 to 45 °C, which suits standard electrical cabinet installations on the factory floor. For axis feedback, the drive also provides a second encoder input that can be assigned to spindle position sensing or to an auxiliary motor when required.

Thermal management uses forced cooling through a mounted heatsink blower, which exhausts heat at the rear panel and supports continuous operation during prolonged cutting cycles. The drive can be installed up to 1000 m above sea level without any change to its normal cooling method. The electronics cage has no additional interface option, so wiring is limited to the main control ribbon, encoder sockets, and power terminals, keeping the connection layout straightforward inside the cabinet.