Product Description:

The SF-A3.0042.060-00.000 is produced by Bosch Rexroth Indramat and belongs to the SF Servo Motors series. The unit functions as a compact rotary actuator for CNC tables, packaging axes, and similar automated stages where fast acceleration and tight position loops are required. By combining an integrated single-turn absolute encoder with a low-inertia rotor, it provides closed-loop feedback to a drive amplifier for repeatable motion profiles. Its compact format also suits space-limited assemblies where motor size affects axis responsiveness and moving mass.

At its rated operating point, the motor reaches a speed of 6000 rpm, allowing high surface velocities on small-diameter tooling. The electromagnetic design has a torque constant of 0.7 Nm/A, so each ampere of phase current contributes 0.7 newton-meters of shaft torque and supports predictable current-based control. When the rotor is held stationary, the windings can deliver a maximum static torque of 3.9 Nm while drawing a locked-rotor current of 6.0 A; these values show the peak starting load the drive must accommodate. Position feedback is supplied by a single-turn absolute encoder with a resolution of 8 million increments per revolution, which supports very fine indexing and helps limit accumulated positioning error in multi-axis systems. The encoder’s accuracy of ±20 arc-seconds further narrows the allowable positioning band for contouring applications.

A rotor inertia of 7 × 10⁻⁴ kg·m² allows rapid speed changes without placing excessive demand on the servo amplifier. The overall unit mass is 7.0 kg, which keeps the motor manageable on compact machine axes while still helping resist vibration during repeated motion. Installation is supported by a flange width of 116 mm and a flange pilot diameter of Ø110 j6 that centers the housing accurately in mating surfaces. Output torque is transmitted through a keyed shaft measuring Ø19 × 40 mm, and the A6 × 6 × 32 feather key helps prevent hub slip while allowing up to 133 N of axial load. The centered pilot and keyed output also help maintain alignment between the motor and the driven element during reversing motion.