Product Description:

The SD-B5.250.030-00.000 electric actuator is manufactured by Bosch Rexroth Indramat and belongs to the SD Magnet Motors series. Designed for closed-loop drives, it converts electrical power from an Indramat amplifier into rotational motion for indexing tables, pick-and-place heads, and similar industrial axes. Its construction combines permanent magnets with a stator winding to deliver repeatable torque without brush wear. That operating principle makes the actuator suitable for high-duty-cycle motion tasks that require stable speed control and repeatable positioning over long production runs.

Mechanically, the motor mounts to gearboxes or machine frames through a 116 mm square flange that establishes the reference plane for concentric alignment. The output shaft measures 19 × 40 mm, which sets the shaft diameter and the usable engagement length for hubs or pulleys. When energized but motionless, the windings can generate 25 Nm of torque, allowing the axis to hold static loads such as vertical tooling or tensioned webs. During motion, the rotor can reach a nominal velocity of 3000 rpm, which is the rated operating speed for continuous use. Magnetic excitation is provided by ferrite blocks that supply a stable field without rare-earth materials. This combination of flange size and shaft geometry supports secure mechanical coupling in compact drive assemblies.

The shaft is prepared with a keyway and a matching featherkey, so torque is transmitted through positive locking rather than surface friction. As a brushless servo motor, commutation is handled electronically, which removes carbon contact wear and reduces electrical noise in feedback circuits. Electronic commutation also allows the paired amplifier to manage torque production directly during starts, stops, and rapid reversals. This control method helps the actuator respond cleanly to changing load demands without introducing mechanical contact wear at the commutation stage.