Product Description:

Bosch Rexroth Indramat builds the KDA 3.1-100-3-AYD-U1 spindle drive for high-speed machining centers and automation lines that rely on precise speed and torque regulation of induction or synchronous spindles. The unit belongs to the KDA Spindle Drives series and converts shared DC-bus energy from modular power supplies into controlled three-phase output for the connected motor. By integrating closed-loop current and velocity regulation, it maintains spindle stability during cutting, threading, or grinding cycles that demand repeatable acceleration profiles. This operating behavior suits machine processes that require steady spindle response during changing loads and rapid speed transitions.

Its power section draws from a regulated bus of 300 VDC and can deliver a continuous armature current of 100 A, allowing large-frame spindles to reach rated power without derating. Thermal energy generated by the output stage is removed through forced cooling by a mounted axial blower attached to the heat sink. That blower operates from an auxiliary supply of 115 V/50–60 Hz, so it can be powered from standard control transformers. Because the cooling airflow is controlled by internal temperature sensors, the drive keeps component temperatures within safe limits even during extended full-load duty. This supports stable current regulation with minimal drift in the switching devices.

For system integration, the drive accepts a digital position command value through its additional interface and provides a second encoder input and synchronous input for master-slave phasing or spindle orientation. Speed override is performed through an analog speed command value, which enables continuous velocity setpoint changes from external CNC or PLC hardware. Safe operation is specified for ambient temperatures between 5 to 45 °C and installation heights up to 1000 m above sea level without performance adjustment. These interface and operating limits suit cabinet installation in general machine tools, wood routers, and packaging spindles. They also support applications where synchronized spindle motion and controlled speed changes must be coordinated with the rest of the machine.