Product Description:

The SF-A4.0091.030-04.050 is a servo motor produced by Bosch Rexroth Indramat within the SF Servo Motors series. It is designed to convert electrical energy from a drive into controlled mechanical rotation for positioning, feed, and velocity loops in industrial automation cells. By coupling its drives to machine axes, this unit supplies closed-loop motion with high indexing accuracy that is suitable for transfer lines, packaging equipment, and CNC auxiliaries.

The motor reaches a rated speed of 3000 rpm, enabling direct coupling to medium-inertia loads without gear reduction. A torque constant of 1.42 Nm/A links drive output current to continuous torque generation, simplifying current-loop tuning. Feedback is supplied by an optical encoder that delivers 8 million incr./rev. with an angular precision of ±20 arcsec; this resolution supports fine position interpolation and smooth velocity control. The mounting interface is defined by a 142 mm square IEC flange, and the shaft measures Ø24 × 50 mm with an 8 × 7 × 40 mm key for torsion-proof coupling. During stall testing, the stator can draw 7.0 A of locked-rotor current while holding a locked-rotor torque of 10 Nm, values used for short-term overload sizing.

An integrated holding brake supplies 18 Nm of static torque to secure vertical or indexing axes when the drive is de-energized; it is energized at 24 VDC and requires 0.7 A. For emergency stops the electromagnetic circuit can dissipate a locked-rotor torque of 10 Nm until the drive recovers. Dynamic response is influenced by a rotor inertia of 21 ×10^-4 kg·m², giving moderate acceleration while helping damp load disturbances. The assembly, including the brake, weighs 14.7 kg and spans 293 mm in length, factors that affect mounting clearances and gantry counterbalance calculations.