SR-A2.0020.060-04.000 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat SR-A2.0020.060-04.000 is part of the SR Synchronous Servo Motors series and has a rated speed of 6000 rpm with a torque constant of 0.74 Nm per Amp. The motor uses a resolver encoder with a resolution of 8192 increments per revolution and features a holding brake torque of 3.2 Nm. It weighs 5.8 kg and has a shaft size of 14 x 30 millimeters.
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Product Description:
Bosch Rexroth Indramat builds the SR-A2.0020.060-04.000 as part of the SR Synchronous Servo Motors series. This brushless AC motor is intended for positioning and speed-control tasks in automated machinery, converting drive current from a compatible inverter into controlled mechanical rotation for gantries, feeders, and indexing tables. A splined center hole built to DIN 332-DS M5, a Ø14 × 30 mm shaft with feather key A5 × 5 × 25, and a 217 mm overall length allow direct coupling to precision gearboxes or pulleys while keeping the motor envelope compact for cabinet or robot-arm mounting.
The electromechanical profile starts with a holding brake that resists back-driving loads with 3.2 Nm of torque, preventing drift on vertical axes when power is removed. During normal operation, the rotor can reach a rated speed of 6000 rpm, giving high linear throughput when the motor is paired with low-ratio gear stages. Torque production scales with current at a constant of 0.74 Nm/A, a value used by servo drives to predict load response and tune current loops. Dynamic behavior is influenced by a rotor inertia of 3 × 10⁻⁴ kg·m², which supports rapid acceleration without demanding excessive peak current. The complete assembly weighs 5.8 kg, which suits moving-axis installations and also helps stabilize fixed mounts.
The permanent-magnet brake uses a control supply of 24 VDC with a tolerance of ±10% and 5% ripple, and the coil draws 0.56 A during release to keep internal heat low. If the load stalls, the stator can deliver a locked-rotor current of 2.7 A and generate up to 2.0 Nm of static torque without movement. Position feedback comes from a resolver that provides 8192 increments/rev, allowing fine interpolation for smooth low-speed motion. Additional mechanical features include a brake inertia of 0.4 × 10⁻⁴ kg·m² and a DIN-standard center hole, which help simplify integration.
