Product Description:

The SF-A4.0125.030-00.015 is a synchronous servo motor produced by Bosch Rexroth Indramat within the SF Servo Motors series. It converts controlled DC-link energy into precise rotary motion for positioning and velocity control in automated assembly stations, packaging equipment, and material-handling axes. A built-in absolute encoder supplies the drive with exact shaft position so closed-loop regulation can be executed without external feedback devices. Its compact square flange supports installation in tight machine spaces, and the motor can respond quickly to repeated starts, stops, and speed changes in coordinated motion systems.

With a DC-link supply of 670 V, the motor is intended for connection to high-voltage servo inverters, which helps limit current for a given power output. Under rated conditions it reaches 3000 rpm, a speed suited to many conveyor and spindle applications while avoiding unnecessarily large mechanical reduction stages. During startup, the stator can draw 10.6 A of locked-rotor current and produce 14.5 Nm of stall torque, allowing the axis to overcome static friction and begin moving under load. Once rotating, output torque scales linearly with current through a constant of 1.37 Nm/A, giving the controller a direct and predictable relationship between commanded current and shaft torque.

The absolute encoder maintains position with an accuracy of ±20 angular seconds and a resolution of 8 million increments per revolution, permitting finely interpolated moves and smooth control at low speed. Mechanical integration is aided by the 142 mm flange, while the listed rotor inertia supports a balance between quick acceleration and stable running behavior. Acoustic emission remains below 58 dB(A) at nominal load, which helps reduce machine noise in production areas. Two NTC temperature sensors report winding heat to the drive so derating can occur before insulation stress rises, and the housing tolerates 6 g shock loading during machine operation.