SR-A4.0172.030-04.000 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat SR-A4.0172.030-04.000 is a synchronous servo motor from the SR Synchronous Servo Motors series, featuring a resolver feedback device and a protection type of IP67. The motor has a rated speed of 3000 min-1, a torque constant of 1.38 Nm per amp, and a mass of 20.7 kilograms with the brake installed. Its brake voltage is 24 VDC and the holding brake torque is 18 Nm.
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Product Description:
The SR-A4.0172.030-04.000 belongs to the SR Synchronous Servo Motors series from Bosch Rexroth Indramat. As a brushless servo motor, it provides closed-loop rotary positioning and velocity control for automated machinery that requires a compact, sealed design. Resolver feedback supplies the rotor position information needed by the drive to regulate motion accurately. The integrated holding brake secures the shaft when motor power is removed, supporting vertically loaded axes, indexing tables, and other applications where uncontrolled movement must be prevented.
The motor reaches a rated speed of 3000 rpm during nominal operation. Its torque constant of 1.38 Nm/A relates drive output current to the torque produced at the shaft. Under locked-rotor conditions, the windings may draw up to 13 A, so the connected drive must accommodate this peak current. The housing has an IP67 protection rating, which prevents dust entry and withstands temporary immersion in water. Position data come from a resolver that provides 8192 increments per revolution, giving the controller fine angular resolution for precise interpolation and contouring movements. This feedback resolution supports accurate stopping after rapid acceleration in packaging stations, material-handling gantries, and automatic tool changers.
The holding brake produces 18 Nm of static torque and requires a release current of 0.7 A. Its coil operates at 24 V DC, limiting the load placed on the control power supply. The motor has an overall mass of 20.7 kg, including the brake, and the housing measures 356 mm from the mounting flange to the rear cover. Rotor inertia is 40 × 10⁻⁴ kg·m², while the brake contributes an additional inertia of 3.1 × 10⁻⁴ kg·m². These inertia values affect acceleration and deceleration response when the drive adjusts shaft speed. A feather key measuring A8 × 7 × 40 connects the shaft to compatible couplings or pulleys. The shaft has a diameter of 24 mm and an extension length of 50 mm, providing a positive mechanical interface for transmitting torque.
