Product Description:

The SF-A4.0091.030-00.000 is a brushless servo motor manufactured by Bosch Rexroth Indramat for the SF Servo Motors series. Designed for closed-loop industrial axes, it delivers commanded torque to indexing stations, gantry drives, and automated tooling where rapid reversals and repeatable positioning are required. By integrating a single-turn absolute encoder and temperature sensing inside a compact frame, the unit provides motion feedback and thermal data directly to the drive controller. This arrangement allows the connected drive to monitor rotor position continuously while also watching winding temperature during sustained operation.

A rated shaft speed of 3000 rpm combines with a torque constant of 1.42 Nm/A, allowing the drive to estimate output torque from phase current. When the rotor is blocked, the shaft can resist 10 Nm while drawing up to 7.0 A, which helps with circuit protection and coupling selection during stop conditions. Dynamic response is aided by a rotor inertia of 21 × 10⁻⁴ kg·m², which balances acceleration capability against load stability. The keyed shaft measures 24 mm in diameter and 50 mm in length for positive torque transfer to pulleys, couplings, or gearbox inputs. The overall housing length is 246 mm, which helps the motor fit installations with limited depth. Two NTC sensors are embedded in the stator windings so the drive can reduce current before excessive temperatures develop.

The optical disc resolves 8 million increments per revolution, and each count is calibrated to within ±20 angular sec for high-gain position loops with minimal dithering. A flange width of 142 mm aligns with standard IEC mounting faces, which simplifies gearbox or bracket selection in packaged motion assemblies. The motor weighs 13 kg, giving it a substantial frame while remaining suitable for compact servo axes. This combination of encoder resolution, mounting size, and moderate mass supports precise positioning in automated machinery where stable feedback and rigid installation are important.