Product Description:

The KDA 3.1-050-3-AYI-W1 spindle drive is manufactured by Bosch Rexroth Indramat as part of the KDA Spindle Drives series. It serves as the power and control stage between an Indramat DC bus and a high-speed motor spindle, translating CNC command values into controlled motor current. This arrangement supports repeatable torque buildup and acceleration in machining centers, grinders, and drilling units. An integrated heat sink blower helps stabilize internal temperature during sustained spindle operation, and the unit helps maintain commanded speed during load changes caused by tool engagement.

The drive delivers a continuous motor output current of 50 A, allowing the output stage to support demanding cutting loads without saturation. A regulated bus voltage of 300 VDC feeds the power electronics, while an auxiliary supply of 220 V/50–60 Hz powers the heat sink blower. The thermal system uses forced cooling through the mounted blower, moving air across the power semiconductors and current-sensing components. That airflow reduces heat buildup in the power section during long machining cycles and repeated acceleration events. Speed commands are accepted as an analog voltage signal, which allows smooth spindle speed control from conventional CNC controllers or PLC analog outputs.

The unit is intended for operation in ambient temperatures from 5 to 45 °C and at installation heights up to 1000 m above sea level. It provides an incremental encoder output so the CNC can monitor spindle position or speed feedback without added signal splitters. A second encoder input and synchronous input lets the drive process auxiliary feedback signals and coordinate timing in synchronized spindle functions. This is useful in machines that must match spindle rotation with feed motion for processes such as threading and other timing-sensitive operations.