Product Description:

The SF-A4.0172.030-10.053 is a servo motor produced by Bosch Rexroth Indramat for the SF Servo Motors series. It serves as a rotary axis in industrial automation where closed-loop control is required. Motor feedback comes from a digital servo feedback system with a multi-turn encoder, giving absolute position over multiple revolutions. The unit is supplied without a blocking brake, so external measures are needed for static holding. A 110 mm centering diameter simplifies alignment, and all power conductors exit on side B of the housing for cabinet-side wiring.

During continuous operation, the motor delivers a torque of 19.5 Nm at standstill while drawing a steady phase current of 21.4 A. This capability results from the electromagnetic design that yields a torque constant of 0.91 Nm/A, meaning nearly one newton-meter per ampere. The windings present an inductance of 6.1 mH, and the winding resistance is 0.56 Ω, which contributes to copper losses during operation. Under rated conditions, the shaft can reach a nominal speed of 2000 rpm, which suits many medium-inertia drive axes used in machine tools, packaging lines, and handling modules.

For transient events, the servo can accept a peak current of 96.5 A, enabling acceleration to the theoretical limit of 60.6 Nm before current limiting occurs. The rotor inertia is 42 × 10⁻⁴ kg·m², a value that balances quick response with stable load coupling, and the enclosure carries an IP65 rating so the motor can be mounted in dusty or splash-exposed zones without added covers. A thermal time constant of 50 minutes indicates that internal temperature rises gradually during cyclic duty, allowing longer overload intervals when commanded motion profiles require output above the continuous rating.