Product Description:

The KDA 3.1-150-3-AYD-U1 belongs to the KDA Spindle Drives series manufactured by Bosch Rexroth Indramat. Within a machine-tool cabinet, this spindle drive converts command references from the CNC into three-phase power for high-speed spindle motors. It supports precise acceleration, deceleration, and steady-state cutting speed control required in automated milling, turning, and grinding cells. This operating role allows the drive to handle both rapid spindle speed changes and stable rotation during material removal.

This Series 3 unit operates from a DC link of 300 V DC and supplies up to 150 A of armature current, so the connected spindle can reach its rated torque without derating. Thermal management is handled by forced cooling that passes air through a mounted heat sink blower, and the blower itself is powered from an auxiliary line of 115 V/50–60 Hz. The analog speed command input lets the supervisory controller transmit ±10 V references directly to the current regulator, and an internal monitoring circuit protects the IGBTs against overload. Because the power stage is air cooled rather than liquid cooled, the cabinet does not require coolant lines or a separate liquid circuit.

Interface flexibility is provided by a secondary channel that accepts a digital position command value, allowing closed-loop position control when the spindle is used as a C-axis. The drive also has a second encoder input and a synchronous input, so it can process feedback from both an incremental spindle encoder and an external master axis during rigid tapping or synchronous machining. Continuous operation is specified for ambient temperatures between 5 to 45 °C. Full performance is available up to 1000 m above sea level, which suits typical indoor industrial installations without added cooling equipment.