Product Description:

The SF-A4.0091.030-04.053 is a synchronous servo motor manufactured by Bosch Rexroth Indramat for the SF Servo Motors series. This motor forms the electromechanical link between the drive amplifier and moving machine parts, delivering controlled rotary motion for positioning, velocity tracking, or cyclic indexing tasks in industrial automation cells. By combining permanent-magnet excitation with feedback-compatible windings, it supports closed-loop drive systems that demand accurate torque production and repeatable speed profiles. Its construction allows direct mounting to gearboxes or load shafts without intermediate belts, which helps reduce drivetrain compliance and keeps motion transfer more direct.

It reaches a rated shaft velocity of 3000 rpm, allowing the motor to support fast positioning and stable speed control in automated axes. The torque constant of 1.42 Nm/A links phase current to usable torque, so each ampere of stator current produces predictable shaft output. Under continuous load, the motor can deliver a holding torque of 18 Nm, while the inverter draws operating energy from a DC link of 670 VDC. The integral fail-safe brake is released with 24 VDC and draws 0.7 A during release, allowing the axis to remain mechanically secured when drive power is removed.

Mechanical integration is simplified by a flange diameter of 142 mm, which aligns with common mounting interfaces for servo installations. When starting from rest, the windings can withstand a locked-rotor current of 7.0 A and generate a locked-rotor torque of 10 Nm, giving the drive clear electrical and mechanical limits during startup. During operation, the acoustic emission measured at one meter is 58 dB(A), which helps suit production areas where lower motor noise is preferred. The stator assembly tolerates shocks up to 6 g without loss of alignment, and two NTC thermistors report internal temperature to the drive so thermal conditions can be monitored during repeated duty cycles.