Product Description:

The KDA 3.2-100-3-AYI-U1 spindle drive is produced by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. Designed to regulate main-spindle torque and speed in numerically controlled machining centers, the unit converts a constant DC link into a variable three-phase output that follows a command signal from the machine controller. Installed near the motor, it supports rapid speed changes that help maintain cutting consistency during milling, drilling, and grinding operations. This operating style suits machine tools that need quick spindle response during acceleration, deceleration, and steady-speed cutting.

Its power section operates from a 300 VDC supply generated by a common supply module, and it can deliver up to 100 A of continuous motor current for strong spindle acceleration during tool changes and heavy cutting transitions. Thermal energy is removed by a mounted heat sink blower powered at 115 V at 50–60 Hz. This blower works with a forced cooling airflow path so the drive can maintain its rating in densely packed cabinets where heat buildup would otherwise limit output. Velocity is set through an analog reference, and the internal control loop interprets the signal as an analog speed command to modulate the inverter section and keep spindle speed aligned with the requested value.

The electronics operate in ambient temperatures from 5 to 45 °C and at mounting elevations up to 1000 m above sea level. Feedback wiring is simplified by the built-in incremental encoder output, which provides a direct path for speed-related feedback signals. Positioning precision can also be improved through the optional second encoder input, which accepts a synchronous marker for applications that require tighter spindle orientation control. The drive is series 3 and version 2, which distinguishes this build within the KDA line.