Product Description:

The SG-B3.055.049-13.010 is a brushless servo motor built by Bosch Rexroth Indramat within the SG Synchronous Servo Motors series. The metallic construction houses a rotor fitted with samarium-cobalt magnets and a resolver for closed-loop orientation, making the unit suitable for feed axes that demand a high dynamic response. In automated production cells, the motor receives regulated current from a digital drive controller and converts it into precise spindle motion, enabling repeatable positioning and consistent surface speeds in processing stations.

At the mechanical interface, a 24 mm × 50 mm smooth shaft transmits torque without keyways to minimize runout in coupled loads. Rated static torque reaches 5.8 Nm, giving the axis sufficient holding force against machining or inertial resistance when the rotor is energized but stationary. During these standstill conditions, the winding draws 13.4 A, which the associated inverter must sustain while keeping the motor within its thermal limits. When motion is commanded, the rotor can accelerate until it stabilizes at the nominal speed of 4800 rpm, which balances magnetic flux with back EMF during continuous operation. A small integrated holding brake is included so vertical or suspended axes remain fixed after the drive is disabled, preventing drift while drawing power only for the brake coil.

The enclosure carries an IP65 protection rating, so dust and water jets do not reach the windings or resolver. The Class F insulation according to VDE 0530 allows the copper windings to reach 155 °C before insulation degradation occurs, providing a margin that supports passive cooling through thermal radiation and natural convection. A 140 mm centering flange follows accuracy grade R to maintain alignment in IM B5 mounting arrangements. The permitted ambient temperature range of 0 to 40 °C supports operation without derating. These operating conditions suit installation on exposed machine frames where the motor may encounter airborne dust, moisture, and changing thermal loads.