Product Description:

Bosch Rexroth Indramat builds the SF-A4.0125.015-14.154 as part of its SF Servo Motors series. This servo motor converts drive current into accurately controlled rotary motion for axis positioning, conveyor regulation, and pick-and-place modules in industrial automation cells where repeatable motion is required. It follows the IM B5 flange-mount construction code, allowing direct coupling to gearboxes or machine frames while keeping the stator housing stationary. A sinusoidal back EMF profile pairs with drive inverters that use vector control for smooth torque production.

During continuous operation, the rotor sustains a rated speed of 1500 rpm, suited to machines that need moderate velocity with accurate positioning. Torque rises linearly with current because the design has a torque constant of 2.8 Nm/A, so each ampere from the inverter delivers proportional shaft output. The common DC bus must provide 670 VDC, giving adequate headroom for field-oriented control. When power is removed, the spring-applied brake holds the shaft with 18 Nm of torque at 120 °C, helping prevent vertical axes from drifting. Position feedback comes from an absolute encoder that resolves 8 million increments per revolution, enabling fine interpolation for tight loop gains. Locked-rotor data of 5.2 A indicates the current associated with stall operation.

The locked-rotor torque of 14.5 Nm indicates the static output available at startup. To engage the holding device, the brake coil draws 0.7 A, limiting heat inside the end bell, while its supply of 24 VDC can share the low-voltage rail with other control circuits. Two integrated temperature sensors, listed as 2 NTCs, alert the controller to rising temperatures and support protective derating. The sinusoidal EMF and the absolute encoder help keep cogging low and stiffness high during incremental moves, which supports smoother interpolation during short indexing motions.