Product Description:

The SR-A4.0125.030-00.000 is a synchronous servo motor in the SR Synchronous Servo Motors series from Bosch Rexroth Indramat. As a rotary actuator, it converts drive current into regulated torque and speed for positioning tables, packaging axes, and other closed-loop automation tasks that require repeatable motion profiles. Resolver feedback built into the housing supplies rotor angle information to the associated drive controller, enabling precise velocity and position regulation within industrial machinery. Its synchronous design also supports stable response during repeated starts, stops, and load changes in automated equipment.

A flange face diameter of 142 mm and a pilot diameter of Ø130 j6 center the motor on gearboxes or machine plates, while a Ø24 × 50 mm shaft with a feather key A8×7×40 transmits torque through keyed couplings. During startup, the winding can draw 10.6 A to develop a locked-rotor torque of 14.5 Nm, allowing loads to overcome static friction without external gearing. Once running, the unit stabilizes at its rated speed of 3000 rpm. The electromagnetic design produces torque in proportion to phase current, and its constant of 1.37 Nm/A helps the drive scale commanded current to mechanical output. Resolver accuracy remains within ±10 angular minutes, which supports steady low-speed regulation and repeatable position control.

The motor housing weighs 16 kg, providing useful thermal mass for short overload periods while remaining manageable during installation. A total length of 277 mm allows the unit to fit into compact machine spaces, and the laminated rotor has an inertia of 30 × 10^-4 kg·m², which supports rapid acceleration and deceleration. Electrical angle is digitized at 8192 increments per revolution, allowing the control system to detect small position changes during coordinated axis motion. This level of feedback detail is useful in applications that require smooth interpolation and consistent settling behavior.