SR-A2.0026.030-04.000 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat SR-A2.0026.030-04.000 is part of the SR Synchronous Servo Motors series, featuring a rated speed of 3000 rpm and a shaft size of 14 by 30 mm. It offers a brake holding torque of 3.2 Nm, runs on a brake supply voltage of 24 VDC, and is equipped with a resolver encoder with a resolution of 8192 increments per revolution. The motor has a flange size of 100 mm and a torque constant of 1.5 Nm per amp.
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Product Description:
The SR-A2.0026.030-04.000 synchronous servo motor is produced by Bosch Rexroth Indramat within the SR Synchronous Servo Motors series. It is intended for precision rotary positioning in automated assembly stations, packaging equipment, and material-handling axes. A resolver inside the housing supplies real-time rotor feedback to the drive controller, and an integrated holding brake secures the load whenever the controller issues a stop command. The unit mounts through an IEC-style square flange interface and transmits torque through a keyed shaft that measures Ø14 × 30 mm.
The motor delivers a rated mechanical speed of 3000 rpm, allowing moderate-to-high cycle rates in indexing applications. Its torque constant is 1.5 Nm/A; each ampere of phase current therefore produces 1.5 newton-meters of electromagnetic torque, simplifying drive sizing calculations. The connected inverter must supply a DC-link voltage near 670 V so the stator windings can reach the commanded operating point without saturation. Position information is generated by a resolver that the drive interprets at 8192 increments per revolution, enabling fine velocity regulation and smooth interpolation between points. Mechanical attachment is through a square flange that measures 100 mm across, matching common planetary gearboxes and machine frames. At standstill, the motor can withstand 2.6 Nm of locked-rotor torque while drawing a locked-rotor current of 1.7 A.
The holding brake operates from a control rail of 24 VDC and has a static holding capacity of 3.2 Nm. When coil voltage is removed, spring force re-engages the brake in 29 ms; releasing the brake requires a coil current of only 0.56 A, minimizing the load on the control supply. The brake inertia of 0.4 × 10⁻⁴ kg·m² adds little mass to the rotor, keeping the combined rotor inertia at 4 × 10⁻⁴ kg·m² for responsive acceleration. The Ø14 mm shaft accommodates standard couplings for a direct connection to the load.
