Product Description:

The SF-A4.0091.030-10.053 is a synchronous servo motor built by Bosch Rexroth Indramat for the SF Servo Motors series. It converts electrical energy into precisely regulated torque and speed so controllers can move linear or rotary axes with repeatable accuracy inside automated packaging, material-handling, and printing equipment. By combining rapid acceleration capability with accurate digital feedback, the unit keeps cycle times consistent in motion-critical stations. It is suited for indexing, registration, and synchronized transfer tasks where repeatable motion is required through frequent start-stop cycles. The motor is intended for use with a compatible servo drive that manages current, speed, and position control.

It delivers a continuous standstill torque of 28.0 Nm, allowing the rotor to hold this load indefinitely without overheating. The windings draw a continuous standstill current of 46.2 A to sustain that torque. During motion, the rotor reaches a nominal speed of 3000 rpm. The torque constant is 0.61 Nm/A, so each additional ampere raises shaft torque by about six-tenths of a newton-meter. A winding inductance of 2.7 mH limits current ripple and helps shape servo response. This combination supports responsive speed changes and stable control when load conditions vary through the cycle. A surface-cooling housing removes heat, and digital servo feedback transmits position data to the drive. Peak current demand is 145 A for short accelerations, supported by windings with 0.25 Ω resistance. A plain shaft simplifies coupling, and the unit is supplied without a blocking brake.

A centering diameter of 110 mm aligns the flange precisely to mounting faces, and the housing mass of 22.0 kg adds stiffness that helps reduce vibration. Low rotor inertia of 0.0042 kg·m² permits rapid reversals, while the theoretical maximum torque reaches 60.6 Nm for brief load peaks. This supports quick direction changes on indexing and transfer axes without making the motor slow to respond. A thermal time constant of 45 minutes means the stator temperature rises gradually during changing duty cycles, while digital feedback continues to support accurate position control as operating conditions shift.