Product Description:

The SF-A4.0125.030-10.071 is a three-phase servo motor produced by Bosch Rexroth Indramat within the SF Servo Motors series. It is intended to deliver closed-loop rotational motion for positioning axes, pick-and-place heads, and coordinated drives in automated cells. By combining a permanent-magnet rotor with encoder feedback, the unit translates drive commands into precise shaft movement and torque, forming an electromechanical link between the power electronics of an Indramat inverter and the mechanical load. This arrangement supports accurate starts, stops, and speed changes during repetitive machine cycles.

Its DC bus is rated for 670 V, letting converters of the same voltage class supply current without derating. At start-up, the stator can draw 10.6 A as locked-rotor current, generating a stall torque of 14.5 Nm for breakaway loads. The torque constant is 1.37 Nm/A, so the drive can calculate the required current during vector control. A square 142 mm pilot circle on the flange provides the mounting interface, and an absolute-value encoder sends multi-turn position data so rotor angle is available immediately after power-on. This helps the axis resume controlled motion without a homing move after power is restored.

With a total weight of 16 kg and an aluminum frame, the housing resists machine vibration while keeping thermal mass moderate. The shaft reaches a rated speed of 3000 rpm under closed-loop control, and the footless flange arrangement allows axial installation through an adapter ring in IM B5 form. Two integrated NTC sensors send winding temperature data to the drive for thermal limiting, which helps protect the motor during repeated load changes. Designed for cyclic duty, the bearing system has a minimum operating life of 20,000 h, and shock resistance up to 6 g helps protect the encoder during handling.