Product Description:

The SR-A5.0250.030-04.000 is a synchronous servo motor produced by Bosch Rexroth Indramat within the SR Synchronous Servo Motors series. The unit delivers closed-loop rotational motion for industrial automation axes that need precise speed and torque regulation. Its electromechanical design includes an integrated holding brake and resolver-based position feedback so that machine controllers can command rapid starts, controlled stops, and exact positioning in assembly cells, packaging lines, and CNC systems. With its medium frame size, it fits directly to gearboxes or belt drives in compact machinery.

The motor reaches a rated speed of 3000 rpm, allowing high cycle rates while staying within the thermal limits of the stator windings. A torque constant of 1.44 Nm/A indicates the proportional relationship between phase current and shaft torque, enabling drive amplifiers to calculate current commands directly from load demands. During startup, the rotor can supply 23 Nm of locked-rotor torque when the drive delivers a locked-rotor current of 16 A. For static load holding, the spring-applied brake generates 56 Nm, so vertical or suspended axes remain stationary during power loss. Feedback is provided by a resolver with 8,192 increments per revolution. The shaft interface uses a 10 × 8 × 50 mm feather key, and the 32 × 58 mm journal accepts standard couplings.

The brake operates from a 24 VDC supply and draws a rated current of 1.33 A, allowing control cabinets to power it from common auxiliary rails. Mechanical integration is aided by a flange measuring 190 mm, an overall length of 345 mm, and a mass of 29.2 kg. Dynamic response benefits from a rotor inertia of 83 × 10^-4 kg·m², which supports quick acceleration without causing servo instability. The assembly withstands shocks up to 6 g, protecting the internal laminations and resolver from sudden machine impacts.