Product Description:

The SF-A4.0230.030-14.056 is a servo motor from Bosch Rexroth Indramat within the SF Servo Motors series. This compact rotary unit converts drive current into precisely controlled torque and speed for positioning axes, packaging lines, or material-handling gantries in automated cells. By combining commutation electronics with an enclosed electromagnetic stack, the motor supports closed-loop motion where reliability, smooth speed control, and repeatable positioning are critical. It can be used on indexing stations and feed axes that need accurate starts, stops, and speed changes over repeated production cycles.

At its rated speed of 3000 rpm, the rotor can deliver continuous motion without exceeding thermal limits or encoder resolution. The motor has a torque constant of 1.57 Nm/A, so each ampere from the drive produces predictable mechanical output. During startup, the stator may briefly draw a locked-rotor current of 14 A, generating a stall torque of 22 Nm that helps overcome static friction until acceleration begins. A permanent-magnet brake operates at 24 VDC through a dedicated 0.7 A coil and adds 3.1 × 10⁻⁴ kg·m² of inertia to the shaft. Its conductors are routed through a 2 × 1.5 mm² brake cable, while phase power reaches the terminals through a 4 × 2.5 mm² motor cable terminated in connector size 1. The rotor inertia of 54 × 10⁻⁴ kg·m² supports fast indexing with vibration damping, and absolute encoder feedback sends angular position directly to the controller.

In steady-state operation, the holding brake secures the shaft with 18 Nm of torque, allowing vertical loads to remain fixed when power to the DC link is removed. When the inverter supplies the drive bus at 670 V, the servo maintains sinusoidal commutation and limits electromagnetic distortion to 5% residual ripple. Two integrated 2 × NTC temperature sensors send winding data to the drive so current limits can respond to motor temperature during operation. This arrangement lets the drive react to heat buildup without relying only on fixed current limits. That helps the axis remain responsive during changing load conditions.