Product Description:

Bosch Rexroth Indramat supplies the SF-A4.0091.030-14.050 as part of its SF Servo Motors series. The unit is a rotary servo motor intended for closed-loop industrial automation tasks where precise speed and position control are required. By combining a permanent-magnet rotor with an integrated safety brake, it allows production equipment to hold an axis at standstill without external clamps, thereby supporting pick-and-place systems, packaging lines, and light machining centers.

At its 3000 min-1 rated speed, the motor can produce a continuous shaft output while limiting vibration through a smooth-profile rotor. The electromechanical brake develops 18 Nm of holding torque when the axis is stationary; it is engaged by a control channel that draws only 0.7 A of current, so the motion controller can reserve minimal power for safety holding. The winding set shows a torque constant of 1.42 Nm/A, giving predictable torque gain per phase current, and the stator core is mounted on a 142 mm square flange that aligns directly with standard machine plates. Dynamic behavior of the brake is characterized by a 25 ms delay before engagement, a 50 ms release, a 3.1 × 10⁻⁴ kg·m² brake inertia, and a 1.04 kg dedicated brake mass, providing repeatable stop times without excess overshoot.

The brake coil is energized from a 24 V DC ±10% source, letting low-voltage safety circuits manage axis locking independently of the main drive bus. During demanding start-ups the rotor can withstand a locked-rotor current of 7.0 A while generating 10 Nm of locked-rotor torque for brief index moves. Once motion begins, a total rotor inertia of 21 × 10⁻⁴ kg·m² supports accurate acceleration profiles without excessive servo gain. Overall machine depth is set by a 293 mm motor length including the brake, and power is transmitted through a Ø24 × 50 mm smooth shaft that minimizes coupling wear. These dimensions keep installation compact while the smooth shaft style simplifies hub-style couplings.