Product Description:

The SR-A4.0172.030-14.000 synchronous servo motor is produced by Bosch Rexroth Indramat as a member of the SR Synchronous Servo Motors series. It converts three-phase electrical power from a compatible drive into controlled rotary motion for industrial automation axes, including linear slides, pick-and-place heads, and packaging spindles. By delivering commanded speed and torque with encoder feedback, the unit forms the actuation element that links CNC or PLC motion profiles to mechanical loads.

At its rated operating point, the motor turns at 3000 rpm. The motor has a torque constant of 1.38 Nm/A, so each ampere of phase current produces nearly one and a half newton-meters of drive torque. Dynamic response is aided by a rotor inertia of only 0.0040 kg·m², limiting the energy that must be accelerated or decelerated during rapid indexing moves. Without the optional brake, the assembly weighs 19 kg, which must be considered for overhead or mobile axes. Power is transferred through a smooth shaft that is 24 mm in diameter and 50 mm long, allowing direct coupling to gearboxes or belt pulleys. The overall length is 309 mm, which helps the unit fit into compact machine frames.

Additional features support secure holding and precise feedback. When power is removed, the integrated spring-applied brake delivers a static torque of 18 Nm to resist gravity-loaded or thrust-loaded motion. The motor has a locked-rotor current of up to 13 A, which must be considered when selecting drive protection. The brake coil is energized by a nominal 24 VDC supply and draws 0.7 A during release, while its inertia adds only 3.1 × 10⁻⁴ kg·m² to the rotating mass. For position feedback, the resolver provides an equivalent resolution of 8192 increments per revolution, giving the control loop fine angular granularity. A 142 mm square mounting flange maintains concentric alignment with gearbox faces.