Product Description:

The SF-A4.0172.030-04.000 is a three-phase permanent-magnet servo motor manufactured by Bosch Rexroth Indramat for the SF Servo Motors series. Designed for precision rotary axes, it converts regulated drive current into controllable torque and speed so that packaging machines, handling robots, and machine-tool spindles can follow exact motion profiles under PLC command. A built-in single-turn encoder supplies the position feedback required for closed-loop control, which helps the drive maintain accurate speed regulation and repeatable positioning during continuous operation.

The motor has a brake with a holding torque of 18 Nm to secure loads when power is removed, and it can run continuously at 3000 rpm to support high-throughput cycle demands. A torque constant of 1.38 Nm/A relates drive current to output torque, allowing the control system to match current demand to acceleration requirements. The brake draws 0.7 A from the control supply and releases at a rated 24 VDC. The mechanical interface uses a 142 mm flange, a Ø130 j6 centering diameter for concentric mounting, and a Ø24 × 50 mm keyed shaft for torque transfer to couplings or pulleys. During start-up, the locked-rotor current reaches 13 A, a value that is useful when matching the motor with a suitable inverter and protective devices.

The feedback system provides a resolution of 8 million increments per revolution, giving the single-turn encoder very fine position data for precise axis control. Total moving inertia, including the encoder, is 40 × 10⁻⁴ kg·m², which affects acceleration response and jerk behavior in rapid indexing cycles. The housing has a mass of 20.7 kg, which is relevant when the motor is installed on moving axes or gantry structures. Its overall length of 356 mm allows the motor to fit installations where axial space is limited.