Product Description:

The SF-A4.0125.030-14.053 is a brushless servo motor in the SF Servo Motors series produced by Bosch Rexroth Indramat for closed-loop motion axes in automated machinery. It converts electrical energy from a matched drive into rotary torque and speed for positioning, conveying, and synchronized motion tasks in industrial automation. The motor is suited for mid-range axis duties where stable velocity and repeatable positioning are required. Its brushless construction also supports precise control with reduced mechanical wear compared with brushed motor designs.

The motor reaches a nominal shaft speed of 2000 rpm when used with a compatible controller, allowing steady process rates under rated load. Its torque constant is 0.91 Nm/A, which helps relate motor current to available torque during load changes. The three-phase stator has a phase inductance of 6.1 mH and a phase resistance of 0.56 Ohm, and these values affect drive tuning and electrical losses. The housing carries an IP65 enclosure rating, which helps protect internal parts from dust and low-pressure water exposure. Digital servo feedback on the rotor encoder supplies position data to the drive for real-time regulation, while the power and signal conductors exit on side A to simplify cable routing.

A centering diameter of 130 mm helps align the flange accurately on machine mounting faces. The motor has a total mass of 22.0 kg, which contributes to a rigid mechanical fit during fast axis movement. Rotor inertia is 42 × 10⁻⁴ kg·m², giving the drive a predictable load characteristic during acceleration and deceleration. The windings have a thermal time constant of 50 min, so short overload periods can be absorbed before the motor reaches steady-state temperature. Safe storage is possible from -20 °C to +80 °C without condensation, and operation is permitted at installation altitudes up to 1000 m without derating.