Product Description:

The SD-B 4.140.020-01.010 is a brushless servo motor manufactured by Bosch Rexroth Indramat for the SD Magnet Motors series. The unit converts electrical drive signals into controlled mechanical rotation, supplying precise torque and speed for positioning axes, packaging lines, and other automated equipment. Its brushless design supports repeatable motion control and reduces wear associated with commutated motor designs, which helps the motor suit continuous industrial operation. When paired with a compatible servo amplifier, it can support closed-loop axis control where smooth response and stable holding performance are required.

At zero speed, the motor can maintain a load with a standstill torque of 14.0 Nm while drawing a standstill current of 9.8 A. The torque constant of 1.43 Nm/A links phase current to produced torque during holding operation. The phase winding resistance of 1.875 Ω contributes to copper losses, and the winding inductance of 20.6 mH slows abrupt current changes. With ferrite magnets in the rotor, magnetic saturation occurs at lower flux than in rare-earth designs, while demagnetization behavior remains stable in typical industrial service. The electrical time constant is 11.0 ms and the mechanical time constant is 7.7 ms, so current and speed respond quickly without becoming overly abrupt.

During normal rotation, the shaft delivers a nominal power of 2.9 kW at a nominal speed of 2000 rpm. For brief accelerations, the drive can accept a peak current of 34.3 A, and the voltage constant of 206 V/1000 rpm reflects the back-EMF generated as speed rises. A built-in tacho generator supplies 2.7 V per 1000 rpm with a series resistance of 20 kΩ, allowing analog velocity feedback to legacy controllers that use separate speed signals. The housing meets the IP54 protection standard, so dust ingress is limited and splashed water does not affect internal components. Thermal loading is moderated by a 130-minute thermal time constant, permitting extended duty cycles before steady-state winding temperature is reached.