Product Description:

The SF-A4.0125.030-14.050 is a servo motor produced by Bosch Rexroth Indramat as part of the SF Servo Motors series. This motor converts controlled electrical energy into rotational motion for positioning tasks in industrial automation such as indexing tables, packaging axes, or material handling equipment. A 130 mm centering pilot and 142 mm square mounting flange allow direct attachment to precision gearboxes or machine frames, while a keyed 24 mm shaft transfers commanded torque to the load. Its 50 mm shaft projection leaves space for standard couplings and helps support accurate alignment between the motor and driven equipment.

Its integrated electromagnetic holding brake is powered at 24 VDC and draws a steady 0.7 A during operation. When activated, the brake applies 18 Nm of static torque to lock the rotor and maintain position during power-off conditions or controlled stops. The mechanical components engage fully after 25 ms, and electrical release is completed within 50 ms, so the axis can return to motion with little delay. This behavior is useful on indexing and vertical applications where the shaft must remain fixed between motion cycles.

At a rated speed of 3000 rpm, the motor delivers continuous torque with low electrical loss, supported by a torque constant of 1.37 Nm/A. During standstill, the windings can sustain up to 10.4 Arms without exceeding thermal limits, which helps the drive maintain accurate low-speed control. The steel rotor has a moment of inertia of 0.0030 kg·m², supporting fast acceleration while helping limit servo overshoot. Initial acceleration is assisted by a locked-rotor torque of 14.5 Nm that helps overcome static friction at the load interface. With an overall length of 324 mm and a mass of 17.7 kg, the unit remains suited to tightly coupled multi-axis assemblies.