Product Description:

The SF-A4.0125.030-04.050 is a brushless servo motor manufactured by Bosch Rexroth Indramat within the SF Servo Motors series. Designed for indexing axes, packaging stations, and general positioning tasks, it converts inverter commands into accurate mechanical rotation for repeatable motion control. An integrated holding brake and a sealed housing help the unit maintain load position and operate in washdown areas common in industrial automation cells. Its flange interface aligns directly with standard planetary gearboxes, and the brushless design supports smooth operation with reduced routine wear.

The electromagnetic brake applies a holding torque of 18 Nm, so the shaft remains locked when control power is removed. To energize the brake, the coil draws 0.7 A at a control voltage of 24 VDC, which limits demand on auxiliary power circuits. During operation, the inverter supplies the motor from a DC link of 670 V, providing the voltage headroom needed for rapid acceleration. Brake inertia is 3.1 × 10⁻⁴ kg·m² and the brake mass is 1.04 kg, so the added rotating load remains modest. The assembly withstands shocks up to 6 g, helping protect internal feedback parts during transport or abrupt machine stops. A locked-rotor current of 10.6 A is the peak stator current when the shaft is prevented from turning.

When stalled, the motor can deliver up to 14.5 Nm of locked-rotor torque, giving the axis strong starting force against static friction. It reaches a rated speed of 3000 rpm during normal operation, which supports quick index moves and stable servo response. The square flange measures 142 mm across, matching common mounting patterns for direct installation. A housing protection level of IP67 keeps out dust and allows temporary immersion, while the 1.37 Nm/A torque constant relates commanded current to output torque in a straightforward way.