SR-A4.0172.030-00.000 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat SR-A4.0172.030-00.000 is part of the SR Synchronous Servo Motors series and has a flange size of 142 mm with a shaft size of 24 mm by 50 mm. This servo motor offers a rated speed of 3000 rpm, a torque constant of 1.38 Nm/A, and a locked-rotor torque of 18 Nm. It features resolver feedback with a resolution of 8192 increments per revolution and weighs 19 kg without the brake.
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Product Description:
The SR-A4.0172.030-00.000 synchronous servo motor is manufactured by Bosch Rexroth Indramat within the SR Synchronous Servo Motors series. Its compact format suits machines where axis spacing is limited. It serves as a compact rotary actuator that works with a matched drive, converting DC-link power into precise shaft motion for pick-and-place axes, robotic joints, and high-speed conveyors in automated factories. A resolver mounted on the rotor supplies real-time position signals to the controller, allowing the drive to maintain commanded positions and regulate acceleration along set velocity profiles. This feedback arrangement also supports stable commutation during rapid direction changes and short positioning cycles.
The motor reaches a rated speed of 3000 rpm, allowing quick indexing while staying within normal operating limits. A torque constant of 1.38 Nm/A means the motor produces 1.38 Nm of electromagnetic torque for each ampere of current, which helps match it to a suitable inverter. The winding system operates from a 670 V DC link, supporting high power density and lower phase current for a given output. Dynamic response is influenced by a rotor inertia of 40 × 10⁻⁴ kg·m², which gives the axis a balance between rapid acceleration and controlled load behavior. For start-up or emergency stopping, the motor can deliver a locked-rotor torque of 18 Nm, and the static current in that condition is 13 A.
Resolver feedback resolution is 8192 increments per revolution, and its precision is ±10 angular minutes for accurate position tracking. A square mounting interface with a flange size of 142 mm and a 24 mm diameter shaft with a 50 mm length simplify coupling to gearboxes or belt pulleys, while the overall housing length without a holding brake is 309 mm. The assembly mass of 19 kg gives the motor useful thermal mass without making installation excessively cumbersome. The motor also uses 2 NTCs to report winding temperature to the drive and support overload protection during sustained duty.
