SR-A4.0091.030-00.030 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat SR-A4.0091.030-00.030 synchronous servo motor is part of the SR Synchronous Servo Motors series and weighs 13 kilograms. It features a resolver encoder with 8192 increments per revolution, a torque constant of 1.42 Nm per amp, and a rated speed of 3000 rpm. The motor provides a locked-rotor torque of 10 Nm and uses a 6-pin, size 1 connector.
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Product Description:
The SR-A4.0091.030-00.030 is a synchronous servo motor developed by Bosch Rexroth Indramat for the SR Synchronous Servo Motors series. Designed for closed-loop motion control, it translates commanded current into regulated shaft rotation, enabling precise positioning, velocity control, and torque delivery in automated production lines, material-handling axes, and assembly equipment. Position feedback is produced by a resolver with an effective resolution of 8192 increments per revolution, supporting smooth motion and accurate interpolation at low speeds.
During continuous operation, the motor reaches a rated speed of 3000 rpm, providing a stable operating point for drive configuration and motion control. Electromagnetic conversion efficiency is indicated by a torque constant of 1.42 Nm/A, so each ampere supplied by the drive produces 1.42 newton-meters of torque at the shaft. When the shaft is blocked, the stator can generate 10 Nm while drawing 7.0 A, which helps establish suitable stall-current thresholds. Emergency braking energy of up to 785 Ws can be dissipated as heat through an integrated 1.0 Ω plug-braking resistor. The mechanical interface uses a 24 × 50 mm shaft fitted with an 8 × 7 × 40 mm feather key for positive engagement with a coupling or driven component. Power conductors run through a 4 × 1.5 mm² cable that connects to a six-pin, size 1 motor connector.
The rotor has a moment of inertia of 21 × 10⁻⁴ kg·m², supporting quick acceleration while allowing the drive to maintain stable motion control. The housing has a mass of 13 kg, providing thermal mass without placing excessive load on the mounting surface. With a body length of 246 mm, the motor fits shallow machine frames, compact gantry carriages, and other installations with limited axial clearance. The feedback system supports a positioning accuracy of ±10 angular minutes, maintaining repeatable alignment in indexing tables, pick-and-place arms, and fine-tolerance transfer systems. Its keyed shaft provides secure torque transmission, while the resolver supplies continuous rotor-angle information to the connected drive. The integrated braking resistor provides a local path for dissipating energy during emergency stops.
