Product Description:

The SF-A4.0230.030-14.160 is a servo motor from Bosch Rexroth Indramat built within the SF Servo Motors series. This permanently excited synchronous unit converts electrical energy into controlled mechanical rotation for positioning, conveying, or indexing tasks in automated machinery. Its design combines an absolute value encoder for closed-loop feedback with a fail-safe holding brake, allowing the motor to maintain load position when power is removed.

The brake circuit is energized at 24 VDC and draws just 0.7 A, so a small supply can release the fail-safe mechanism during normal operation. When engaged, the brake delivers a holding torque of 18 Nm, and its own inertia is 0.00031 kg·m², which adds little to the total rotating mass. During motion, the rotor can reach the rated speed of 3000 rpm, while the torque constant of 1.57 Nm/A links current output from the drive to mechanical torque. The motor flange follows the IM B5 construction type, giving a face-mount interface that aligns directly with gearboxes or machine frames. Electronic commutation works with the absolute encoder to command smooth phase switching, reducing torque ripple.

At start-up, the drive may supply a locked-rotor current of 14 A, allowing the shaft to produce a breakaway torque of 22 Nm before rotation begins. The connection to the power converter is sized for a DC link potential of 670 VDC, matching high-voltage servo inverters used on multi-axis lines. Total reflected inertia, including the encoder, is 0.0054 kg·m², and this value helps set tuning gains so acceleration commands stay within thermal and mechanical limits. Because the motor uses permanent magnets and electronic commutation, current is applied only to generate torque, improving efficiency under continuous duty. The absolute value encoder feeds position data to the controller, so homing routines are unnecessary after emergency stops.