Product Description:

The KDA 3.2-100-3-DYD-U1 is a spindle drive produced by Bosch Rexroth Indramat for the KDA Spindle Drives series. It functions as a closed-loop power stage that regulates rotor speed and torque for high-speed machine-tool spindles and similar automated processes. The unit translates numeric controller commands into precise motor currents for stable speed control and coordinated spindle operation. This type of drive is commonly used where spindle acceleration, speed holding, and repeatable response must remain consistent throughout varying load conditions.

The drive is powered from a DC bus of 300 VDC, which serves as the internal energy source for the three-phase output supplied to the spindle motor. Under continuous duty, it can deliver a rated line current of 100 A, which is the maximum current the power electronics can sustain without thermal derating. Thermal energy is removed by forced cooling, and the blower is powered from a single-phase supply of 115 V/50–60 Hz. Speed references enter through a digital 16-bit parallel interface, allowing the controller to receive finely graduated velocity commands and respond accurately during rapid speed changes.

The unit operates in ambient temperatures from 5 to 45 °C, which suits typical indoor industrial conditions when adequate airflow is maintained around the heat sink. Installation is permitted up to 1000 m above sea level, although reduced air density above that height can lower cooling performance. For axis synchronization, a dedicated port accepts a digital position command value signal so the spindle can follow position loops from a higher-level motion controller. A second encoder input and a synchronous input are also provided, allowing a motor-mounted encoder to work with an external reference marker for electronic gearing, coordinated motion, or master-follower operation.