Product Description:

The SF-A4.0125.030-10.015 belongs to the SF Servo Motors series from Bosch Rexroth Indramat. This permanently excited synchronous unit is intended for closed-loop positioning and velocity control on packaging lines, pick-and-place axes, and other automated machinery that need fast response and repeatable accuracy. Electronic commutation drives sinusoidal back-EMF windings so the motor can be paired directly with the manufacturer’s digital drives for high-bandwidth current regulation and smooth torque delivery.

The winding set is energized from a DC link of 670 V, allowing the drive inverter to supply significant power without excessive current. Under rated conditions, the shaft can reach 3000 rpm, a speed that aligns with common mechanical transmission ratios in compact machines. The motor has a torque constant of 1.37 Nm/A, which lets controllers estimate load using current feedback. Rotor position is reported by an absolute-value encoder that resolves each mechanical revolution into 8 million increments, enabling very fine interpolation when a precision leadscrew is used. At startup, the motor can deliver a locked-rotor torque of 14.5 Nm, giving the axis enough breakaway torque to overcome static friction and seating forces.

Starting current peaks at 10.6 A, a value that drive sizing must accommodate for reliable torque boost without tripping the supply. Feedback fidelity is assisted by an angular error not exceeding ±20 arcseconds, so contouring systems can maintain tight path tolerances. Total rotating inertia, including the encoder, is 30 × 10⁻⁴ kg·m², which supports rapid reversals while still damping minor load disturbances. The housing follows the flange-mount pattern IM B5, simplifying integration onto gearheads or directly onto machine frames. Two integrated NTC sensors monitor winding temperature so the drive can reduce current if thermal limits are approached.