Product Description:

The KDA 2.1-150-3-AP0-U1-115 spindle drive is produced by Bosch Rexroth Indramat as part of the KDA Spindle Drives series. It belongs to the Series 2 hardware generation and regulates a synchronous or induction spindle in industrial machining centers. By receiving a speed reference from the CNC and returning real-time position through its second encoder channel, the unit supplies controlled three-phase power to the motor. This control structure supports steady spindle regulation during cutting, drilling, and other machining operations where speed stability and responsive feedback are important.

Its power stage is energized from a DC link rated at 300 VDC, and the current limit is 150 A, allowing the drive to handle demanding acceleration profiles without saturation. The available current reserve supports rapid acceleration and load changes during spindle startup and speed transitions. Thermal energy created during these high currents is removed by a mounted heat sink blower that operates with forced cooling, so heat is carried away from the power section instead of relying only on passive dissipation. The blower is supplied from an auxiliary line of 115 V/50–60 Hz, which keeps airflow available independently of the main motor power circuit.

The drive operates in ambient air from 5 to 45 degrees Celsius and at installation heights up to 1000 m above sea level. Speed commands are received as an analog voltage, allowing integration with legacy numerical controls, and the second encoder input can be used for spindle feedback or additional motor feedback when the application requires it. The design includes no additional interface option, which keeps the connection layout limited to the standard control and feedback paths. This simpler interface arrangement is useful in cabinets where the spindle axis does not require extra network hardware or optional communication modules.