SR-A4.0091.030-00.000 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat SR-A4.0091.030-00.000 is part of the SR Synchronous Servo Motors series and features a protection rating of IP67 with natural convection cooling. The motor has a resolver encoder, a flange diameter of 142 mm, and a motor length of 246 mm. It weighs 13 kilograms and delivers a rated speed of 3000 min-1 with a torque constant of 1.42 Nm per ampere.
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Product Description:
The SR-A4.0091.030-00.000 is a synchronous servo motor manufactured by Bosch Rexroth Indramat within the SR Synchronous Servo Motors series. Designed for closed-loop positioning and speed tasks in industrial automation, the unit converts electrical drive signals into precise mechanical rotation. It uses natural convection for cooling, eliminating external fans and permitting installation in sealed machine areas. An integrated resolver supplies rotor position data to the drive controller, and the IM B5 flange mounting lets the motor bolt directly to gearboxes or machine plates. Overall housing length without a brake is 246 mm. This configuration supports accurate motion control in systems that require steady response, repeatable shaft movement, and compact mechanical integration.
At its rated speed of 3000 rpm, the electromagnetic design produces continuous motion while keeping winding temperature within limits. The torque constant is 1.42 Nm/A, so each ampere of phase current produces just over 1.4 newton-meters of torque for current-controlled drive operation. During startup or stalled conditions, the motor can supply a locked-rotor torque of 10 Nm for up to 30 seconds at a 100 K temperature rise, and it draws 7.0 A under that load. A combined rotor and encoder inertia of 0.0021 kg·m² indicates the shaft’s resistance to acceleration and deceleration when servo commands change. These values support drive tuning where smooth response and predictable motion behavior are required during rapid changes in speed or load.
The housing carries an IP67 rating, so dust ingress and temporary water immersion do not compromise operation. Unbraked mass is 13 kg, providing stable mounting without excessive load on the machine frame. A circular flange diameter of 142 mm centers the stator on the mating surface, while the 24 x 50 mm keyed shaft transmits torque directly to couplings or pulleys without adapters. These mechanical features support installation on equipment that requires secure alignment and dependable torque transfer. The sealed housing and resolver feedback make the motor suitable for machines that operate in demanding industrial environments where reliable position feedback is needed during repeated motion cycles.
