Product Description:

The SF-A4.0125.030-04.000 servo motor is produced by Bosch Rexroth Indramat and belongs to the SF Servo Motors series. The unit is an electromechanical rotary actuator intended for positioning and velocity control tasks inside automated machinery such as packaging stations, gantry axes, and material-handling modules. It converts command currents from a matching drive into proportional shaft torque while providing feedback through an integrated encoder, thereby enabling closed-loop motion in industrial automation cells.

The motor mounts to the machine frame with a 142 mm flange size, and its cylindrical shaft measures Ø24 × 50 mm and is furnished with a feather key A8x7x40 for positive torque transfer. A total length of 324 mm and an inertia of 30 × 10⁻⁴ kg·m² give moderate acceleration capability for medium-mass loads. At the stator winding, the locked-rotor current reaches 10.6 A and produces a 14.5 Nm locked-rotor torque, while the 1.37 Nm/A torque constant indicates the torque produced per ampere. Under rated excitation, the rotor can attain a 3000 rpm rated speed, and position information is supplied by a single-turn STG encoder with 8 million increments per revolution. During normal service, the separate holding brake uses a 0.7 A brake current, helping prevent unintended shaft movement when the drive is disabled.

The electromechanical brake operates at 24 VDC ±10% and generates 18 Nm of holding torque to secure the axis during downtime. With a total mass of 17.7 kg, the motor adds a predictable load to the drive chain while remaining suitable for vertical or gantry installation. The keyed shaft mates directly with gearboxes or belt pulleys, allowing slip-free torque transfer. Encoder feedback works with the drive to stop the shaft at precise positions and reduce settling time during step-and-repeat sequences.