Product Description:

The SF-A4.0125.015-00.000 is a rotary servo motor from Bosch Rexroth Indramat and belongs to the SF Servo Motors series. It is intended for closed-loop motion axes that require accurate speed and position control in automated machinery, packing lines, and material handling stations. By combining a permanent-magnet rotor with an absolute encoder, the motor provides continuous electrical feedback, allowing the drive controller to regulate torque quickly during indexing, speed changes, and position holding.

The motor uses a mounting flange of 142 mm, and the output shaft measures Ø24 × 50 mm, which allows direct connection to common couplings, gearboxes, or belt pulleys without extra interface hardware. Under rated operating conditions, the rotor turns at 1500 rpm, making it suitable for axes that need controlled acceleration and steady running speed. The torque constant is 2.8 Nm/A, so motor current can be related directly to produced torque during load matching. For startup and holding against static load, the motor can deliver 14.5 Nm of locked-rotor torque. The housing depth is 277 mm without a brake, and the integrated single-turn absolute encoder supplies position data continuously during operation.

The peak stall current reaches 5.2 A, matching the winding design and setting the upper current demand that the inverter must support during low-speed or blocked-rotor conditions. The motor weighs 16 kg, which keeps installation loads manageable on compact machine structures while still providing a stable mechanical platform. Encoder feedback is resolved to 8 million increments per revolution, and absolute position accuracy is rated at ±20 angular seconds, which helps reduce following error in tightly controlled axes. Rotor inertia is 30 × 10⁻⁴ kg·m², giving the motor enough stored rotational energy to smooth load disturbances while still supporting responsive speed changes. This balance is useful on indexing tables, feed systems, and other servo axes that alternate between short moves and steady operation.