Product Description:

The SF-B4.0125.060-00.050 is a rotary motor produced by Bosch Rexroth Indramat within the SF Servo Motors series. It is intended for closed-loop positioning and speed regulation in automated production lines, where rapid acceleration and repeatable indexing improve throughput and part quality. A single-turn absolute encoder provides immediate position feedback at power-up, allowing controllers to resume motion sequences without homing. This arrangement supports machines that must restart with the shaft position already known and helps maintain stable motion on indexing tables, feeders, and transfer axes.

Installation dimensions are fixed by a 142 mm square flange that follows the IM B5 face-mount pattern. The drive end carries a 24 mm shaft that extends 50 mm and is machined with an A8×7×40 feather key for slip-free coupling to pulleys or gearboxes. Overall motor length is 277 mm, which helps when space is limited inside guarded machine sections. During continuous duty, the rotor can spin at up to 6000 rpm, a speed suitable for high-speed spindle or feeder roles. A torque constant of 0.71 Nm/A links commanded current to developed torque, allowing predictable response as load changes. Encoder precision is ±20 arcsec, so small angular deviations can be corrected before they affect downstream motion.

Total mass is 16 kg, yielding a moment of inertia of 30×10⁻⁴ kg·m² including the encoder; this inertia profile promotes quick acceleration while limiting overshoot in multi-axis systems. If the rotor is blocked, it withstands 12 Nm of locked-rotor torque while drawing a peak of 17 A, which helps size protective circuitry and current limits in the connected drive. The single-turn encoder returns 8 000 000 incr/rev, enabling fine incremental moves for vision-guided pick-and-place heads. Its Single-Turn Absolute format transmits one unambiguous position word per revolution, so the motor can return to the correct angular reference after a power cycle.