Product Description:

The SR-A3.0042.060-14.000 is a synchronous servo motor produced by Bosch Rexroth Indramat within the SR Synchronous Servo Motors series. As a compact rotary actuator, it translates drive current from a matched servo amplifier into precise shaft motion for positioning and velocity tasks in automated machinery. The combination of permanent-magnet excitation and resolver feedback allows closed-loop control of angular position, making the unit suitable for pick-and-place axes, packaging spindles, and other high-cycle industrial stations where repeatable starts and stops are important.

At its rated operating point, the motor reaches a shaft speed of 6000 rpm, which is the upper continuous velocity limit before derating. Electromechanical output is set by a torque constant of 0.70 Nm/A, so each ampere of phase current generates 0.70 newton-meters of torque. During start-up, the windings can accept a locked-rotor current of 6.0 Arms, producing a stall torque of 3.9 Nm for overcoming static loads. Dynamic response is aided by a rotor inertia of 7 × 10⁻⁴ kg·m², allowing rapid acceleration with limited controller effort. A resolver with 8192 increments per revolution supplies position feedback, and the smooth Ø19 × 40 mm shaft transmits motion without keyway-induced imbalance.

A spring-applied holding brake supplies 10.0 Nm of static torque to keep the axis stationary when the drive is disabled. The brake is energized with a supply of 24 VDC, engages fully within 20 ms, and releases in 29 ms, making it suitable for emergency stop sequences that demand predictable clamping times. Axial mechanics are protected by an allowable thrust load of 133 N acting along the shaft centerline. With a motor length of 262 mm and a mass of 7.6 kg, the unit fits medium-frame machinery without excessive overhang.