Product Description:

The SF-A3.0068.030-00.018 is a permanent-excited synchronous servo motor produced by Bosch Rexroth Indramat within the SF Servo Motors series. Designed for industrial automation, it supplies controlled torque and speed to pick-and-place units, packaging lines, and CNC positioning tables. An aluminum housing gives low mass and good thermal conductivity, while the IM B5 flange permits direct face-mount installation on machinery without additional brackets.

The motor relies on natural convection cooling, so the external fins and aluminum body radiate heat without fans or liquid circuits. A DC link of 670 V feeds the stator, matching high-voltage multi-axis inverters used on Rexroth cabinet drives. When the command frequency reaches the rated value, the shaft turns at 3000 rpm, maintaining synchronous motion with minimal speed error. During static holding, the windings draw 4.5 A, which helps determine continuous current limits in the drive controller. Sealing to IP67 prevents dust ingress and temporary submersion from affecting internal laminations.

The dynamic response depends on a rotor inertia of 11.3 × 10⁻⁴ kg·m², a value low enough for fast acceleration yet high enough to damp load disturbances. At zero speed, the machine can apply 6.8 Nm of standstill torque, keeping vertical axes in position without external brakes. Winding temperature is monitored by 2 x NTC sensors that report to the drive, supporting derating before insulation limits are reached. This thermal feedback helps the control system reduce load when repeated motion raises internal temperature. For every ampere of phase current, the electromagnetic circuit produces 1.36 Nm/A, simplifying feed-forward torque calculations in the motion controller. That relationship also makes current demand easier to estimate during motion tuning.