SR-A4.0125.030-04.000 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat SR-A4.0125.030-04.000 is a servo motor from the SR Synchronous Servo Motors series, weighing 17.7 kg with a motor length of 324 mm. It features a resolver encoder type with a resolver resolution of 8192 increments per revolution and a rated speed of 3000 min-1. The servo motor provides a holding brake torque of 18 Nm and has a shaft size of 24 x 50 mm.
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Product Description:
The SR-A4.0125.030-04.000 is a synchronous servo motor manufactured by Bosch Rexroth Indramat within the SR Synchronous Servo Motors series. It functions as an electromechanical actuator in industrial robots, packaging stations, and gantry axes, where it converts regulated armature current into repeatable rotary motion. When integrated with a compatible Rexroth drive controller, the motor supports closed-loop motion with rapid indexing, accurate positioning, and consistent process speed without relying on mechanical gear changes.
During production stops or power-off events, the electromagnetic holding brake engages with 18 Nm of torque. The brake coil operates from 24 V DC and draws a steady 0.7 A. It releases after 50 ms, minimizing delays between operating cycles. Locked-rotor data indicate a starting current of 10.6 A and a stall torque of 14.5 Nm, which are useful when setting current limits for the connected drive. The rib-cooled housing measures 324 mm in length and weighs 17.7 kg, allowing secure installation without auxiliary supports. A shaft measuring 24 mm in diameter and 50 mm in length transmits power through an A8 × 7 × 40 feather key, providing positive engagement with compatible couplings and helping control bending loads on connected gearboxes.
During normal operation, the rotor reaches 3000 rpm at rated load, and the permanent-magnet assembly provides a torque gradient of 1.37 Nm/A. Position feedback is supplied by a resolver with a mechanical resolution of 8192 increments per revolution, while its electrical accuracy of ±10 angular minutes supports precise velocity control without a digital encoder. Dynamic response is influenced by a rotor inertia of 30 × 10-4 kg·m², which balances acceleration capability with smooth speed regulation while keeping peak current demand within the limits of the connected drive.
