Product Description:

The SD-B4.140.020-01.010 belongs to the SD Magnet Motors series manufactured by Bosch Rexroth Indramat. It is a brushless servo motor for positioning tasks in industrial automation where repeatable motion is required. A ferrite magnet rotor supplies stable magnetic flux, while the IM B5 construction with a 142 mm flange allows face mounting on gearboxes or machine frames. At a nominal speed of 2000 rpm, the unit can drive loads directly, and the shaft is machined to Ø24 × 50 mm for standardized coupling. The brushless layout avoids commutator wear and supports consistent response in closed-loop motion systems.

During stall conditions, the motor can deliver 14.0 Nm while drawing a standstill current of 9.8 A. Its torque constant is 1.43 Nm/A, which gives the controller a direct relationship between commanded current and output torque. Back EMF is characterized by a voltage constant of 206 V/1000 rpm, so the drive must raise commutation voltage in step with speed. The stator winding has an inductance of 20.6 mH and a resistance of 1.88 Ω. These values influence current ripple, resistive heating, and the way the servo amplifier regulates phase current. The motor also has an electrical time constant of 11.0 ms and a mechanical time constant of 7.7 ms, allowing current to build quickly before the rotor responds with fast acceleration. A keyed shaft and the Ø24 mm journal help maintain concentricity during reversing loads.

For short duty bursts, the drive may command up to 34.3 A, but continuous thermal loading is limited by a rotor and stator mass that reaches equilibrium after 130 min. Operation is permitted in rooms up to 40 °C, and the IP54 enclosure helps block most dust ingress and water splashes. Acoustic output remains 64 dB(A), which helps limit added machine noise in enclosed work areas. The thermal time constant shows that the motor does not reach a steady internal temperature immediately, so short peak loads can be absorbed before the windings and housing fully heat soak.