Product Description:

The SF-A4.0172.030-04.056 is a synchronous servo motor produced by Bosch Rexroth Indramat for the SF Servo Motors series. Designed as a compact rotary actuator, the unit converts electrical energy into controlled torque and speed for positioning tables, pick-and-place heads, and packaging axes in industrial automation.

The permanent-magnet holding brake develops 18 Nm of torque, so vertical axes remain stationary when power is removed. It is energized with 24 VDC ±10% and draws 0.7 A, allowing direct connection to common control-cabinet supplies. The brake assembly adds 1.04 kg to rotor mass but does not affect dynamic performance. When operating at its rated speed of 3000 min⁻¹, the machine can demand up to 13 A of locked-rotor current to reach the locked-rotor torque of 18 Nm during startup. Position feedback is handled by an absolute value encoder that delivers 8 million incr./rev., giving sub-micron resolution on fine leadscrews. With a torque constant of 1.38 Nm/A, the drive controller can estimate load torque from phase current without separate sensors. Two integrated NTC temperature sensors supply winding and housing temperature data to the drive for thermal monitoring.

The mechanical interface uses a 142 mm square flange that matches standard IEC mounting patterns, allowing interchange with existing gearboxes or direct couplings. During regeneration the motor feeds energy to the shared DC bus, which the controller stabilizes at 670 V, so insulation and connector spacing follow high-voltage guidelines. Feedback accuracy is maintained within ±20 arcsec, permitting tight velocity loops even at low speeds. These characteristics enable the motor to fit into multi-axis systems that require high torque density, precise positioning, and consistent thermal reporting without additional transducers.