Product Description:

The KDA 2.1-150-3-AYD-U1 belongs to the KDA Spindle Drives series manufactured by Bosch Rexroth Indramat. As a spindle drive, the unit interfaces between a common 300 V DC bus from the power supply and the three-phase stator of a machine-tool spindle motor. Within an automation cell, it closes the velocity loop internally and feeds position or speed data back to the controller, enabling precise surface finish and repeatable machining cycles. This arrangement lets the controller regulate spindle behavior directly during cutting, drilling, and finishing operations.

The drive is sized for a continuous armature current of 150 A, so it can energize large asynchronous or synchronous spindle motors without derating. That current is drawn from a common DC link held at 300 V DC, and the internal IGBT bridge chops this voltage to produce the required sinusoidal waveform. This supports stable torque production across the operating range and helps the spindle respond smoothly to changing load conditions. Because the power stage generates heat, the housing uses a mounted heat sink blower that forces air through the cooling fins. The blower itself is supplied from an auxiliary line of 115 V at 50/60 Hz, and the control board interprets a ±10 V input as an analog speed command value.

Additional motion channels are available for higher-level synchronization. A dedicated plug accepts a digital position command value stream so the drive can follow position setpoints delivered word by word by a CNC. Another terminal provides a second encoder input and synchronous input, allowing the device to read spindle orientation from an external sensor while also exchanging timing pulses with adjacent axes. These connections support coordinated spindle functions such as orientation, phase matching, and timing-based interaction with other axes. The electronic assembly is intended for ambient temperatures from 5 to 45 °C, and mechanical reliability is maintained up to 1000 m above sea level.