Product Description:

The SR-A3.0042.030-10.000 is a synchronous servo motor produced by Bosch Rexroth Indramat as part of the SR Synchronous Servo Motors series. In factory automation, the unit delivers closed-loop rotational positioning for axes that require repeatable speed and torque. With resolver-based feedback and a B5 mounting flange, the motor connects directly to compatible drive controllers and gear stages. Its sealed housing allows installation on machine heads, gantries, or index tables where compact electric drives replace pneumatic or hydraulic actuators. This arrangement suits packaging, handling, and indexing applications that need stable servo response over repeated cycles.

At its rated speed of 3000 rpm, the motor supplies continuous motion, while the torque constant of 1.6 Nm/A links drive current to shaft torque in a predictable way. In a locked-rotor check, it draws 2.3 A and produces 3.7 Nm of stall torque. The housing is sealed to IP67, which helps keep out dust and allows temporary immersion without damage to internal windings. An IM B5 flange provides a circular mounting interface, and the 19 x 40 mm shaft couples directly to gearboxes. Two NTC thermal sensors report winding temperature so the drive can respond to rising heat during sustained operation. The overall length without a brake is 223 mm.

The motor body weighs 7.0 kg, which helps limit moving mass on gantry axes and other servo-driven assemblies. Rotor inertia of 7 × 10⁻⁴ kg·m² supports smooth velocity reversal while helping reduce overshoot in short-stroke indexing tasks. Position feedback is supplied by a resolver with 10 angular min / 8192 increments/rev., giving the controller fine motion information when it is paired with precision screws or low-backlash transmissions. The standard output flange diameter of 116 mm matches common gearhead and frame adapters used in the series. The combination of moderate inertia and compact mass supports fast start-stop motion on shorter axes.