Product Description:

The SF-A4.0091.060-04.050 is a brushless servo motor developed by Bosch Rexroth Indramat in the SF Servo Motors series. It converts drive current into precisely controlled rotary motion for automation axes that demand high speed and repeatable positioning, acting as the electromechanical interface between the electronic controller and the mechanical load in handling, indexing, and positioning systems. The housing measures 246 mm in length without the brake, has a Ø24 × 50 mm shaft end, and ships without a mating connector, allowing application-specific plugs to be fitted during installation.

Its electromagnetic profile begins with a torque constant of 0.65 Nm/A, which provides a predictable relationship between line current and shaft torque during closed-loop operation. During a stall test, the windings accept 14 A to generate 9.1 Nm at zero speed. Under rated excitation, the rotor reaches 6000 rpm, and the reflected inertia of 21 × 10⁻⁴ kg·m² helps keep the response smooth during acceleration and deceleration. An integral brake powered by 24 VDC ±10% locks the shaft with 18 Nm of holding torque when power is removed. Position feedback is supplied by an optical encoder with ±20 arc-seconds accuracy, which helps the drive maintain tight velocity and position control during rapid motion.

Mechanically, the 142 mm square flange aligns with standard planetary gearheads and supports straightforward mounting to machine structures. The motor weighs 13 kg without its brake, which helps limit the load added to moving machine members while accommodating the stated inertia values. The brake circuit can be routed through ordinary control wiring because its current demand is low. Once the power and feedback leads are terminated, the encoder supports stable command tracking throughout repeated operating cycles and short indexing moves.