Product Description:

The KDA 3.2-050-3-AYI-U1 spindle drive is manufactured by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. The unit serves as the power stage in automated machining centers, converting a regulated DC bus into controlled three-phase output for high-speed spindles. Because it is purpose-built for spindle control, it supports rapid speed transitions while its integrated cooling hardware preserves continuous duty in production environments. It is intended for machine tools that require controlled acceleration, deceleration, and stable speed regulation at the spindle. The output stage works with the machine control to keep commanded speed close to the requested value during changing cutting conditions.

Internally, the drive is powered from a DC link rated at 300 VDC. It delivers a continuous output of 50 A, enabling medium-power induction or synchronous spindles to accelerate quickly under load. Thermal stability is maintained by a mounted heat sink blower that directs air across the power modules. The blower is energized from a single-phase auxiliary supply of 115 V, 50–60 Hz, so no external converter is required. This forced-cooling arrangement keeps junction temperatures within limits provided the surrounding air remains within 5 to 45 °C. Series 3 electronics supervise these protections and handle fault reporting during operation.

The drive supports CNC feedback interfaces for spindle angle and speed control. An incremental encoder output transmits spindle angle to the motion controller, while a second encoder input and synchronous input permit dual-channel monitoring or master-slave coupling. This signal arrangement supports synchronized spindle functions that depend on accurate position exchange with the control system. Velocity commands arrive as an analog speed command value, making the drive compatible with conventional ±10 V control loops. Mechanical installation is permitted up to 1000 m above sea level, where the cooling system can still operate as intended.