Product Description:

The SF-A3.0068.030-04.050 is a servo motor built by Bosch Rexroth Indramat within the SF Servo Motors series. The model is intended for closed-loop motion axes where repeatable torque and position accuracy are required, such as pick-and-place units or packaging stations. It integrates with multiturn absolute feedback so the drive controller always knows shaft position, even after power loss, which helps the axis return to operation without a reference run. This arrangement supports applications that need reliable positioning through repeated starts, stops, and directional changes.

The motor can deliver a continuous shaft load of 14.5 Nm while maintaining a winding current of 36.6 A. A keyed output shaft transfers torque to couplings or pulleys, and the 130 mm centering diameter aligns the housing to the machine frame. Rated speed reaches 4000 rpm, allowing high cycle rates in fast-moving equipment. During rapid indexing, the drive may demand up to 164.8 A for a short period, so the inverter must be selected for both continuous and overload operation. Torque production scales with phase current through a constant of 0.40 Nm/A, while the 1.9 mH winding inductance and 0.20 Ω resistance affect the electrical response of the current loop. Power enters on side B of the housing, which helps separate the motor power leads from the feedback connection and can simplify cable routing in compact machine layouts.

The cast-iron frame weighs 16.5 kg and houses a rotor with an inertia of 0.0029 kg·m², giving moderate acceleration with stable mechanical behavior. A safety brake holds the shaft with 40.0 Nm when the drive is disabled, which helps prevent load drift on vertical axes or other gravity-affected mechanisms. For short overloads, the electromagnetic package can supply up to 45.1 Nm, providing added torque during start-up or momentary load increases. Heat rises gradually through a thermal time constant of 50 min, so temperature changes are not immediate during load transitions. This thermal behavior can help the motor remain stable during repeating duty cycles with brief peaks and steady running periods.