Product Description:

The SF-A4.0172.030-14.153 is a servo motor produced by Bosch Rexroth Indramat within the SF Servo Motors series. It is supplied as a compact, flange-mounted unit that integrates an encoder, a permanent-magnet rotor, and a spring-applied holding brake. In automation assemblies, it provides closed-loop rotation where consistent torque delivery and fast dynamic response are required, enabling coordinated multi-axis motion under digital drive control.

At its nominal operating point, the rotor turns at 3000 rpm. This speed pairs with the torque constant of 1.38 Nm/A, allowing the drive controller to predict output torque directly from phase current. Position feedback is generated by an optical encoder that delivers 8 million increments per revolution with an accuracy of ±20 arcsec, supporting sub-arcminute positioning. The electromagnetic brake is energized from a 24 VDC supply and releases at a coil current of 0.7 A. A flange width of 142 mm and an overall motor length of 356 mm set the mounting envelope, while a Ø24 × 50 mm shaft transmits drive torque. Rotor inertia of 40 × 10⁻⁴ kg·m² supports quick acceleration without overloading the drive, and locked-rotor torque reaches 18 Nm for reliable static holding.

The motor is also rated for defined mechanical loads during operation. The output shaft tolerates an axial thrust of 154 N, allowing the motor to drive belt tensioners or lead screws without additional thrust bearings. When power is removed, the spring-applied brake clamps the rotor with 18 Nm of holding torque so vertical axes remain stationary. During start-up events, the stator can draw a locked-rotor current of 13 A, a parameter that must be considered when selecting fuses and drive electronics. The complete assembly weighs 20.7 kg, which influences mounting structures and adds thermal mass during continuous duty.