Product Description:

The SF-A4.0091.030-04.056 is a frame-mounted AC servo motor produced by Bosch Rexroth Indramat as part of the SF Servo Motors series. It couples with a compatible digital drive to supply controlled torque and speed in automated handling systems, packaging stations, and numerically controlled machine tools. In these applications, it converts electrical input into rotary motion for repeatable axis control under changing load conditions. The motor uses the IM B5 mounting style, which supports face mounting through the end-shield pilot.

The motor reaches a rated shaft velocity of 3000 rpm, giving the axis enough headroom for fast point-to-point moves without overspeeding the mechanical envelope. A torque constant of 1.42 Nm/A provides a direct conversion between commanded current and produced torque, which simplifies controller calculations. The square flange dimension of 142 mm aligns with IEC size codes, allowing direct docking to planetary gearboxes or bell housings without adapter plates. Power is supplied through the inverter's intermediate circuit at 670 V DC, so current levels stay moderate and cable cross-sections remain compact. An IP67 enclosure keeps out dust and tolerates temporary immersion, enabling placement near coolant spray or bulk material transfer. This combination supports high-speed motion while keeping installation dimensions predictable in compact axis assemblies.

Holding and emergency-stop duties rely on a permanent-magnet brake energized at 24 V DC. When powered, it draws only 0.7 A, so the auxiliary supply requirement remains low. The electromagnetic system can deliver a continuous torque of 18 Nm, while a locked-rotor current limit of 7.0 A helps protect the windings during stalls. Two integrated NTC temperature sensors report winding temperature for thermal derating, and an absolute encoder transmits multi-turn position data to the control system so the axis can retain position information after power loss. This feedback arrangement supports closed-loop positioning without requiring a reference run after a shutdown.