Product Description:

The KDA 3.1-100-3-APD-U1 spindle drive is manufactured by Bosch Rexroth Indramat within the KDA Spindle Drives series. It operates as the regulated power link between a numerical control and a machine-tool spindle, supplying adjustable three-phase energy so cutting tools can maintain programmed surface speeds and feed rates during machining cycles. By translating command references from the controller into precise current and voltage patterns, the drive enables high-accuracy speed regulation that is essential for turning, milling, and drilling operations in automated production cells.

The power section is fed from a DC bus of 300 VDC, and it can deliver a continuous spindle phase current of 100 A. A separate heat sink blower runs from a single-phase source rated at 115 V 50-60 Hz, keeping semiconductor temperatures below their limit during heavy chip-removal cycles. Speed reference input is accepted as an analog value, while axis synchronizing information can be supplied through a digital position command. For applications that need orientation control or gearless feedback, a second encoder socket is provided so the spindle drive can read motor-mounted or external position sensors. This arrangement supports coordinated spindle positioning when the control requires angular orientation or synchronized motion. Internally, all command paths and current regulators are tuned for Series 3 performance, allowing fast torque buildup and repeatable low-speed motion.

Thermal management relies on a mounted heat sink blower that forces air through the fin stack, and the drive uses forced cooling to remove heat quickly during high-duty operation. Reliable function is specified over an ambient range of 5 to 45 °C, permitting installation in standard factory enclosures without additional climate control. Altitude capability reaches 1000 m above sea level, so full rated output is maintained in most industrial regions without derating.