Product Description:

The SF-A2.0020.030-04.050 is a servo motor produced by Bosch Rexroth Indramat within the SF Servo Motors series. The unit converts electrical commands from a drive controller into controlled mechanical rotation for positioning axes and tool spindles in automated machinery. Its design combines a permanent-magnet rotor with an integrated holding brake so motion can be stopped and held when power is removed. This makes the motor suitable for index tables, packaging equipment, and general factory automation where controlled stopping and repeatable positioning are important.

The motor attaches to gearboxes or machine frames through a square flange that measures 100 mm on each side, and its overall housing length is 198 mm when the brake is not mounted. A precision-ground shaft sized at Ø14 × 30 mm transmits torque, while the bare assembly weighs 5.5 kg, which helps keep the load manageable on compact moving axes. The rotor inertia is 3 × 10⁻⁴ kg·m², and the torque constant is 1.5 Nm/A, which provides a predictable relationship between motor current and produced torque. Under nominal operating conditions, the rotor reaches 3000 rpm, making it suitable for medium-throughput pick-and-place tasks and other motion sequences that require responsive speed control.

Position retention is handled by the spring-applied brake, which produces 3.2 Nm of holding torque with only 0.56 A of coil current from a 24 V DC supply. The brake adds 0.35 kg to the motor and contributes 0.4 × 10⁻⁴ kg·m² of additional inertia, so its effect on acceleration remains limited. The motor also has a locked-rotor torque of 2.0 Nm and a locked-rotor current of 1.3 A for checking drive limits. That current level indicates the peak demand the selected amplifier must supply while staying within the motor’s allowable thermal range.