Product Description:

The KDA 3.2-100-3-DYI-U1 is a spindle drive manufactured by Bosch Rexroth Indramat within the KDA Spindle Drives series. It acts as the dedicated power stage between the common DC bus and a high-speed machining spindle, converting direct current energy into regulated three-phase output while forwarding position feedback to the CNC. In automated cutting, drilling, or grinding cells, the unit maintains commanded speed and torque so that material removal rates remain consistent. Because the spindle loop remains regulated at the drive level, the CNC can coordinate cutting motion with more predictable spindle response during repeated machining cycles.

Electrically, the drive draws power from a DC link rated at 300 VDC, and its internal IGBT bridge can deliver up to 100 A of continuous current to the motor windings. Spindle velocity is programmed through a Digital (16-bit parallel) command word, which avoids the offset drift associated with analog references. For downstream controllers, the unit offers an incremental encoder output, and it also accepts a second encoder input with a synchronous strobe so dual-loop regulation can be used. That combination supports accurate speed control and timing-sensitive spindle functions such as orientation or synchronized positioning. The drive is in Series 3, and the product version is 2.

Heat is removed by a mounted heat sink blower that provides forced cooling. The blower motor is supplied from an auxiliary line of 115 V/50-60 Hz, allowing connection to standard control transformers without using the spindle power circuit. Rated performance is maintained within an ambient range of 5 to 45 °C, and installation is permissible up to 1000 m above sea level before derating is required. A dedicated blower also reduces thermal stress on the power semiconductors during extended operation at high load.