Product Description:

The SF-A4.0172.060-10.050 is a brushless motor produced by Bosch Rexroth Indramat as part of the SF Servo Motors series. Engineered for precision motion in automated assembly, packaging, and material-handling stations, the unit delivers tightly controlled rotary output when paired with a compatible inverter drive. It serves as the mechanical actuator in closed-loop positioning systems where fast acceleration and accurate feedback are critical.

The drive supplies a DC bus voltage of 670 VDC to the motor’s stator windings, providing the electrical headroom for high-speed operation. Position feedback is delivered by an absolute encoder that resolves shaft angle within ±20 angular seconds and generates 8 million increments per revolution; these values allow tight servo loop gains without dithering. A flange diameter of 142 mm sets the mounting footprint and mates with standard IEC machine frames. Under rated conditions, the rotor reaches 6000 rpm, giving the axis a broad velocity range for indexing or continuous-duty transport functions. The encoder eliminates the need for homing after power loss, which shortens cycle recovery times.

During start-up, the winding can accept a locked-rotor current of 26 A, producing a stall torque of 17 Nm to overcome static friction in loaded mechanisms. The electromagnetic coupling is characterized by a torque constant of 0.65 Nm/A, so commanded current translates linearly into usable torque for precise force control. Dynamic behavior is influenced by a rotor inertia of 40 × 10⁻⁴ kg·m², balancing quick acceleration with load matching on medium-mass tooling. Two integrated NTC temperature sensors report winding temperature to the drive controller, enabling derating or shutdown before thermal limits are reached and helping preserve service life. These signals integrate with the drive’s thermal model for real-time current derating.